bluuebunny/crossref_metadata_2025_split huggingface dataset:
Review of effects the rear spoiler aerodynamic analysis on ground vehicle performance
Authors: Deng Zhaowen , Yu Sijia , Gao Wei , Yi Qiang , Yu Wei 
Published: August 2020

Abstract
Recently reduce in fuel consumption and concern regarding the ground vehicle safety, automotive engineers are faced with the immediate task of introducing more efficient aerodynamic performance vehicles. Hence, the rear spoiler attached on the ground vehicle was presented. Rear spoiler is a device commonly found on road vehicle for improving their aerodynamic performance. Review on the research effects of the rear spoiler aerodynamic analysis on ground vehicle performance is reported in this paper. This review intends to enhance the stability and safety by attaching the rear spoiler on ground vehicle. The review mainly focus on aerodynamic analysis and control of the rear spoiler for different types ground vehicle in term of improving vehicle performance. Researches carried out by a number of researchers with regard to analyze and control the rear spoiler of ground vehicle and their effect on ground vehicle performance. Aerodynamic analysis i.e. computational fluid dynamics(CFD), design optimization, drag coefficient (Cd
) and lift coefficient (Cl
) and control methods i.e. passive control and active control had been reviewed. Meanwhile, progressive research on the rear spoiler aerodynamic analysis was observed due to its flexibility for wide range of application in the different type vehicles.
Feature Extraction from Turbulent Channel Flow of Moderate Reynolds Number via Composite DMD Analysis
Authors: Li Binghua , Mena Jesús Garicano , Zheng Yao , Valero Eusebio 
Published: August 2020

Abstract
In this contribution, we described a Dynamic Mode Decomposition (DMD) analysis of a turbulent channel flow database at a moderate friction Reynolds number Reτ
≈ 950. More specifically, a composite-based DMD analysis was conducted, employing hybrid snapshots assembled by skin friction Cf
(tk
) and either instantaneous Reynolds stress

(

u

′

v

′

(

x

→

;

t

k

)

)

or streamwise velocity fluctuation

(

u

′

(

x

→

;

t

k

)

)

fields. The DMD modes thus obtained were sorted according to its relevance to the Cf
: less than 2% of the modes suffice to reconstruct accurately either the streamwise velocity or the Reynolds stress profiles near the wall. Furthermore, we aim to extend our preliminary work on the analysis of the turbulent database, by considering snapshots encompassing a larger spatial subdomain and covering a longer temporal span. However, this study involved data matrices significantly larger than that one, which the memory footprint of this problem exceeds a typical workstation. Accordingly, we have resorted to the parallel, memory distributed DMD algorithm as a reinforcement. With this enhanced composite DMD algorithm, flow features of moderate and even large turbulent channel problems could be identified and characterized.
Research on Influence of Angle of Deflector on Air Flow in Spray Area Based on Numerical Simulation
Authors: Hao Guangfa , Zhang Chengliang , Sun Kang , Li Lei , Zhou Jun 
Published: August 2020

Abstract
The movement and distribution of the airflow field of the sprayer are very important for the distribution and penetration of the droplets. It is the focus and difficulty of the research to find the airflow field distribution of the fan outlet that matches the parameters of the canopy of the fruit tree. In order to study the influence of the angle change of the deflector of the orchard air-driven sprayer on the three-dimensional spatial distribution of the external air velocity field, this paper numerically simulated the external flow field based on computational fluid dynamics. The spray requirements of different fruit tree crown shapes were analyzed. The ICEM CFD software was used to model the external flow field. In order to improve the calculation efficiency, the model was divided into mixed grids. The k-ε turbulence model and Fluent solver are used for numerical solution. The flow fields of different deflectors are analyzed, and the influence of different positions and different sizes of deflector angles on the external flow field is determined.
Research on the Influence of the Deflector Angle on the Droplet Trajectory Based on the CFD Discrete Phase Model
Authors: Hao Guangfa , Zhang Chengliang , Sun Kang , Li Lei , Zhou Jun 
Published: August 2020

Abstract
In order to investigate the effect of the air deflector sprayer deflector angle on the droplet drift, this paper based on the particle tracking technology of the discrete phase model of CFD, studied the characteristics of droplets at different positions of the deflector angle. In this paper, six groups of nozzles are set at the air outlet in the cuboid calculation area with the conditions of 4000mm × 2000mm × 3300mm. Under the same wind conditions, the sprayer’s deflector changes and the droplet motion characteristics are analyzed. The results show that the droplets are accelerated by the high-speed airflow, and the velocity gradually becomes smaller as the distance increases. The speed is stable at a position close to the canopy of the fruit tree, and the speed is roughly between 8m / s-15m / s, which is almost the same as the wind speed delivered.
Numerical simulation of support interference characteristics on a low-aspect ratio flying-wing model
Authors: Zhang Yaobing , Li Bin , Cui Pengcheng , Zhou Naichun , Wu Xiaojun 
Published: August 2020

Abstract
The flying-wing aircraft is a promising concept for the mid or long-term commercial aviation due to its excellent performance in aerodynamic and structure, which has been studied by a number of investigators both experimentally and computationally. However, the conditions in wind-tunnel testing do not necessarily reflect those observed in free flight, the support structure interference is an important factor to affect experimental data collected from wind tunnels. Support interference characteristics of a flying-wing model from subsonic to supersonic speed is investigated by numerical simulation methods. Results show that grid convergence is obtained with the series of grids, which implies that the solutions are in the asymptotic range. The support has a relatively small effect on aerodynamic characteristics of flying-wing aircraft at low speed while has a relatively large effect on drag at transonic speed and supersonic speed.
Stochastic Characteristic Analysis of Lid-Driven Cavity Flow
Authors: Zhang Chao , Zhao Hui , Hu Xingzhi , Chen Jiangtao 
Published: August 2020

Abstract
The stochastic characteristic of lid-driven cavity flow under the condition of Re=100 is investigated in this paper by a non-intrusive polynomial chaos method. The lid-driven velocity and viscosity coefficient are assumed to be two independent stochastic input variables with Gaussian distributions. The velocities at every grid points are the response of interest and no longer deterministic but stochastic. Their stochastic characteristics are represented by Hermite polynomials with interaction effects between two input variables considered. The statistical results, including mean value, variance and the relative contribution of each input variable to the variance of outputs are analysed. It is found that the variance of velocity shows similar structures with its magnitude of mean value and the correlation coefficient is larger than 0.96. The nearly linear correlation coefficient shows that the lid-driven velocity is the main factor affecting the velocity distribution and the influence of viscosity coefficient on most regions is unimportant. The analysis of stochastic flow field helps understand the inherent mechanism in the lid-driven cavity flow.
Study of underwater vehicle’s bubbly wake caused by side exhausting
Authors: Wang Yun , Xu Jun , Dong Liang , Gu Wei 
Published: August 2020

Abstract
The bubbly wake characteristics of the underwater vehicle are the basic of wake homing techniques. The bubbly wake of the underwater vehicle caused by the side exhausting is simulated based on the Mixture model and the Multiple Reference Frames technology. The results show that due to the side exhausting of the underwater vehicle, a wake with lots of bubbles appears in the sailing through area. The bubbly wake of the underwater vehicle lasts for a long time. As a result, the bubbly wake can be observed in the area far away from the underwater vehicle, which is signification enough to be detected by the bubbly wake detector. Besides, the bubbly wake characteristics for the cases of the underwater vehicle with/without the propeller are much different.
Numerical Simulation of Internal Flow Field and Structural Optimum Design for the diesel engine SCR Catalytic Converter
Authors: Gao Wei , Wang Shaofei 
Published: August 2020

Abstract
A three-dimensional model and finite element model of the diesel engine SCR catalytic converter were established by using ANSYS software. The numerical simulation of the internal flow field for the diesel engine SCR catalytic converter was performed. The results show that the pressure loss of the catalytic converter is larger and the velocity distribution in the front of substrate is nonuniform. On this base, the effects of the diameters and lengths of the substrate on the catalytic converter’s internal flow field characteristic were studied. The results show that when the substrate’s length increases, the pressure loss increases and the velocity distribution uniformity in the front of substrate becomes worse. When the diameter of substrate increases, the pressure loss decreases and the velocity distribution uniformity in the front of substrate becomes better. Therefore, the structure of catalytic converter was optimized. Through the optimization of the structure, the velocity distribution in the front of substrate is more uniform. The passing capacity of substrate is increased. The conversion efficiency of catalytic converter is improved. The back pressure is reduced.
A numerical study of the anti-icing heat load for a three-dimensional aircraft wing
Authors: Ni Zhangsong , Liu Senyun , Zhang Jun , Wang Mao , Wang Zixu 
Published: August 2020

Abstract
In the design stage of an anti-icing system for an aircraft, the heat load on a protection surface must be correctly calculated. In this study, the heat load calculation method for an aircraft wing model was analyzed. The calculation process was presented and the correctness of the method was validated using existing published experimental data. And the effect of variation of incoming flow speeds, flight altitudes, and temperatures on the surface heat-load distribution was given. The results show that the heat load is mainly located at the leading edge of the wing. The maximum value of the heat load can reach 3500w/m2 and the closer to the tip of the wing, the larger the heat load value will be. The heat load curve has a trough in the middle and two shoulders at each side. The range of the non-zero region and the amplitude of the heat load is in proportion to the flow speed. However, the variation of altitude has a non-obvious effect on the heat load results. As the temperature rises, the amplitude of the heat load increases, but the distribution characteristic of the curve remains the same.
Comparative Study on the Aerodynamic Characteristics of Flame Stabilizer Employing Supersonic Jet and Subsonic Jet Based on Numerical Method
Authors: Li Ziwan , Varsegov V. , Yuan Yixiang 
Published: August 2020

Abstract
To compare the aerodynamic characteristics of flame stabilizer by supersonic jet and flame stabilizer by subsonic jet, this article studies the size and length/width ratio of recirculation zone, size of jet trajectory at both supersonic and subsonic jet under the same geometry and boundary conditions in the ANSYS Fluent software program. The result shows that under supersonic jet the size, length/width ratio of recirculation zone and size of jet trajectory are bigger than under subsonic jet. Due to the size of recirculation zone is related to the burning range, that means using supersonic jet as a flame stabilizer can enlarge the stable burning range of a combustion chamber. It would make a big difference when the jet flame stabilizer apply to the gas turbine aircraft engine.
Research on the Influence of Turbulence Model on the Flow Field Characteristics of Rotating Valve
Authors: Song Yuning , Han Liang 
Published: August 2020

Abstract
In order to study the fluid flow characteristics of the key components in hydraulic excited rotary valve,and then determine the area where the vortex and negative pressure to find the weak link in th e structure and analyze the performance of the valve. Simulate the flow field in the rotary valve by Fluent fluid analysis software, and setting different opening degrees under the same boundary condi tions. Studies showed that the velocity at the exit junction of the fluid in the rotary valve, and the vortex degree of pressure is large at the oil groove. When the opening degree is small, the nega tive pressure is large, the vortex is obvious. With the opening becomes large, and the negative pressure and the vortex are improved. The research provides a theoretical basis for the optimization and improvement of the rotary valve. Studies have shown: The velocity of the flow channel calculated under the turbulence RNG k − ε model is the largest, Realizable. The velocity of the flow channel calculated under the model is the smallest. For different models, the values of the low speed region are different, where Realizable k − ε Minimum model speed, The RNG k − ε model has the highest speed and standard. The speed of the k − ε model is in the middle; The high speed area is mainly concentrated in the corner area of the oil tank and valve mouth, The area of high speed area of the RNG k − ε model is smaller than that of the other two models, and the standard of the model is smaller than that of the other two models. The k − ε Model and the Realizable k − ε is no significant difference in the area of high speed area calculated by the model. The comparison draws the following conclusions: The results of the turbulence RNG k − ε model and the other two groups of models are more accurate when calculating the low velocity flow field. The Realizable k − ε Model and the RNG k − ε has the calculation results of the model are similar.
Research on Energy-Saving Wind Turbine Blade Based on Advanced Fluid Mechanics Technology
Authors: Guo Xiaoling 
Published: August 2020

Abstract
The aerodynamic performance of wind turbine blades is of great significance and value to the power output of wind turbines. Correct evaluation of blade performance is beneficial to the design and design of wind turbines. In the operating environment, the aerodynamic load on the blade is a combination of the aerodynamic pressure of the air and the additional force generated by its own rotation. Under different environmental conditions, the aerodynamic load on the wind turbine blades will be significantly different. Using advanced fluid mechanics, the developed program is used to perform aerodynamic simulation on a certain type of wind turbine blade calculation example to obtain the flow field and blade surface pressure coefficient distribution. The calculated results are in good agreement with the experiment, and the developed program can be used for aerodynamic analysis of engineering wind turbine blades, which is conducive to the development of wind turbine design.
Application Research of Computational Fluid Mechanics Based on CNKI Database
Authors: Yan Li 
Published: August 2020

Abstract
Based on the China Knowledge Network Database (CNKI), a literature measurement analysis of the domestic computational fluid dynamics (CFD) application research was conducted. The results show that from 1973 to 2019, the number of articles published by CFD research has increased significantly year by year. The earliest literature on CFD published in the database was published in 1973, and more than 10 articles have been published annually since 2005. The text-issuing institutions are mainly well-known universities in China, among which Tianjin University has the most. Many masters and doctors in this university obtain degrees through researches related to computational fluid mechanics. CFD theory and software are mainly studied in Engineering technology and basic and applied basic research, and more research has been supported by the National Natural Science Foundation.
Thermal design and heat transfer numerical research of kerosene heat exchanger
Authors: Qiu Yinan , Zhang Xiaoping 
Published: August 2020

Abstract
Design of a cryogenic heat exchanger for kerosene rapid cooling is carried out, and the heat transfer mode and structural form of the heat exchanger are preliminarily designed by theoretical calculation. The corresponding physical and numerical models are established, and the cooling characteristics of aerospace kerosene were studied by numerical calculation method. By comparison with experimental data, the validity and accuracy of the numerical simulation results are verified, which provide theoretical guidance for further research.
Study on Failure Mechanism of Throttling Ring Based on Spectral Test Analysis Technique
Authors: Cui Kaibo , Sun Yezun , Zhang Mingzhe , Wen Zhenggang 
Published: August 2020

Abstract
The throttling ring plays an important role in the normal performance of the gun. The inner diameter of the throttling ring directly affects the gun’s recoil stress law and recoil motion parameters. It is of great significance to study the failure mode and failure mechanism. By means of spectral test and analysis technology, wear particle analyzer and ICP-MS and FAAS method are used to test and analyze the content of abrasive particles and ions in the use environment of throttling ring, and to study and determine the failure mechanism of throttling ring.
Numerical Analysis of Temperature Field of Outdoor Transformer with Noise Barrier
Authors: Peng Lei , Fan Xiaopeng , Li Li , Zhou Yongyan , Li Linyong , Zou Zhuanglei , Wang Yibo 
Published: August 2020

Abstract
In order to meet the heat dissipation requirements of outdoor transformers equipped with sound-absorbing barriers, this paper uses the finite element analysis software ANSYS Fluent to simulate the temperature field of outdoor transformers. Firstly, the simulation calculation model is established according to the actual typical outdoor transformer, and the finite element mesh is divided accurately. Secondly, the simulation parameters are set according to the field operation. Then, the distribution of the temperature field of the outdoor transformer and the effect of noise barrier on heat dissipation of outdoor transformer are obtained by the simulation calculation model. The simulation results in this paper provide a preliminary reference for the design of noise barriers of outdoor transformers.
Numerical simulation of the Magnus effect and its application
Authors: Song Liwei 
Published: August 2020

Abstract
Numerical simulations based on computational fluid dynamics are used to study the Magnus effect. The cross force can be obtained through solving the governing equations of the flow around rotating cylinder. Through analyzing the characteristics and structure of the flow field, the Magnus effect can be enhanced by using endplates to change the flow pattern. Numerical results prove the effectiveness and practicality of the improvement.
Study on Heat Transfer Performance of a Liquid Cooling Power Battery
Authors: Xiong Fei , Zeng Junxiong , Ouyang Chenzhi , Wei Dan , Li Gang 
Published: August 2020

Abstract
With the development of new energy vehicles, thermal management of power batteries has become a hot research topic. Power battery thermal management has a very important impact on battery life, safety, charging, and other performance. In this paper, the heat transfer performance of a cooling process is studied by establishing a three-dimensional thermal management model of power battery. The results showed that the proportion of heat in the battery taken directly from the coolant was 91.6%, and the proportion of heat absorbed and dissipated into the environment by the components outside the cell by heat transfer and so on was 8.6%.
Study of Invelox Wind Turbine Considering Atmospheric Boundary Layer: Based on Numerical Simulation
Authors: Ding Li 
Published: August 2020

Abstract
The flow field characteristics of increased velocity (Invelox) system under different wind direction were studied by computational dynamic fluid (CFD) method. Since the Invelox wind turbine system needs to be placed in external space to operate, the atmospheric boundary layer (ABL) wind profile must be considered. The Invelox system was simulated with uniform velocity inlet and exponential wind profile inlet. The results show that when the wind direction is more than 90 degrees from the axis of the venturi pipe, the power generation efficiency of the system will decrease sharply. When the Angle exceeds 120 degrees, the system does not generate electricity. After considering ABL, the speed ratio (SR) of the system will decrease.
Research on mixed gas filling process in laser transmission pipeline
Authors: Xu Zhenyuan , Ma Wenjing , Zhang Junwei , Xiang Yong , Chen Liangming 
Published: August 2020

Abstract
Aiming at the problem of dynamic displacement of mixed gas in laser transmission pipeline, by selecting a typical section of the pipeline, the problem can be simplified to study the filling of binary mixed gas in a relatively closed cavity with the single entrance and exit. The finite volume method is used to simulate the flow field of this section of pipeline, and the velocity distribution of the binary mixed gas filling process is simulated by using the incompressible N-S equation and the standard k-epsilon turbulence model; the molar concentration distribution of the binary mixed gas over time is simulated. Furthermore, the distribution of flow field and the change of gas composition inside the pipeline were calculated under different inlet velocity conditions. Through the above simulations, the change of flow field distribution in the pipeline with time is described; the formation, development and extinction process of vortex at different time or at different positions in the pipeline are simulated. Based on the works above, the basic research idea and theoretical basis of the study on the mixed gas filling progress of large scale laser transmission pipeline are provided. By comparing and analyzing the characteristics of flow field distribution at different inlet velocity or at different time periods of the same inlet velocity, it will also have certain reference value to guide the implementation and optimization of the gas filling project of laser transmission pipeline.
Theoretical and numerical validation for thermal modeling of EV battery cell
Authors: Zhu Linpei , Li Gang , Wei Dan , Xiong Fei , Chen Hu , Ouyang Chenzhi 
Published: August 2020

Abstract
Battery packs are extensively used in electrical vehicles (EV) to avoid environmental pollution. The safety, aging and life of battery cell are significantly related to its thermal behavior. This work concerns with thermal analysis and measurement of an EV battery cell of 153Ah. The Bernardi’s heat generation model is employed and the reversible heat is taken into account. The reversible heat is related to the entropy coefficient and it is tested and presented as a relation to SOC. The specific heat capacity and the relationship between the heat and the temperature rise of battery cells are tested by the EV-ARC. The heat generation model is validated by tests at 0.2 C, 0.67 C and 1.2 C discharging rates. It reveals that the reversible heat is not negligible especially at low rate discharge. Then the heat generation model is applied to a cell model to verify the temperature of the cell. The numerical results from this thermal modeling of the battery cell are in good agreement with the test results.