bluuebunny/crossref_metadata_2025_split huggingface dataset:
Flume Experiments on the Oscillating Wall Jet Induced by the Swing Oblique Impingement Jet
Authors: Zhao Peng , Zhang Minxi , Yu Guoliang 
Published: August 2019

Abstract
The flow characteristics of oscillating wall jets induced by swinging an oblique impingement jet in a rectangular flume is experimentally investigated. By using ultrasonic Doppler velocity profiler (UDVP), the phase-dependent velocity profiles, the phase-varying turbulence fluctuations, and the decay of the velocity along the downstream surface of the oscillating wall jets are observed in a two-dimensional plane. Results show that the mean velocity profile of the oscillating wall jet in the near-bed region generally follows the Weibull distribution, similar to the steady wall jet. Greater fluctuation magnitudes are produced by the oscillating wall jet at the low-speed provocation and high-speed suppression phases than that at the accelerating and decelerating phases. The velocity fluctuations increase with the increasing oscillating frequency. Both the oscillation offset and amplitude of the oscillating wall jet decay continuously with the spreading distance. The decay rate of oscillation offset along the downstream wall of the oscillating wall jet is higher than the velocity decay rate of steady wall jet, and slightly increases with the increment of the oscillating frequency. The oscillating amplitude decays exponentially with the downstream distance.
High Temperature Operation Clothing Design Based on Heat Conduction Equation
Authors: Pan Wenwen , Wang Ying , Shang Yushen , Zhang Liqin 
Published: August 2019

Abstract
Based on the knowledge of heat and mechanics, the relationship between density, specific heat, thermal conductivity and thickness is analyzed by means of heat conduction equation. Under the condition of the change of working time and temperature, the optimal two-dimensional spline interpolation method is used to construct the corresponding functional relation of the temperature distribution field, and based on the numerical model of multi-zone and multi-layer heat transfer of the dummy in the equipment. The thermal physical parameters of each region are determined by experiments, and the equations of thermal equilibrium are established. Under the condition of the problem, the temperature change outside the human body is obtained, and then the temperature distribution outside the human body is obtained. Based on the above model, the experimental results show that the heat absorbed by the outside is consumed layer by layer in the process of heat transfer at high temperature. The following known temperature distribution, at a specific ambient temperature and working time length, the thickness of layer II to layer IV is obtained. By using multi-objective programming and genetic algorithm, the optimal solution is obtained by iterative approximation of the optimal solution for many times, and the final data is obtained by using the method of multi-objective programming and genetic algorithm.
The influence of the guide vane angle of the turbocharger on the turbine mechanical properties and flow field characteristics
Authors: Zhang Shiqiang , Li Chunshu , Fan Liwei 
Published: August 2019

Abstract
Turbocharged gasoline engines produce less exhaust gas when running at a low speed, which is not enough to make the turbine rotor run at a high speed and press in enough air. By changing the cross-section area of the exhaust gas inlet and controlling the gas flow velocity, the turbine can achieve a larger rotation speed with less exhaust gas. Croe2.0 3D software was used to build the 3D model of the adjustable turbine device. ANSYS software is used to analyze the stress of turbocharger turbine. By adjusting the gas flow rate, the adjustable turbine device can significantly change the numerical value of the turbine force, which improves the problems faced by turbocharging engine at low speed and provides theoretical basis for the adjustable turbocharging technology.
Research on optimization of dust measurement pipeline based on Bernoulli Effect
Authors: Liu Dandan , Jing Mingming , Li Dewen , Wang Jie , Tang Chunrui , Ma Wu 
Published: August 2019

Abstract
According to the principle of Bernoulli Effect in fluid mechanics, a dust measurement pipeline with Bernoulli Effect is designed. According to the previous research of the projec, this paper simulates by CFD software, obtains the particle motion velocity and electrostatic induction under different pipe diameter ratio, and finds out the maximum electrostatic induction under the better tube diameter ratio. The annular electrostatic sensor is used to find a better diameter ratio for Bernoulli Effect tube. The improved device model with different pipe diameter ratio was established in Gambit2.4, and 2D stereo model was used for experimental simulation. The velocity cloud map of particle motion is obtained by using FLUENT6.3 to solve the problem, and the corresponding velocity value is obtained according to the cloud image. The electrostatic induction calculation by MATLAB shows that when the diameter ratio d / D is 0.4 and the velocity is 9.76m/s, the electrostatic induced charge of dust particles is the largest at this time. It has certain guiding significance for the design of dust measurement pipeline.
Experimental study on dielectric barrier discharge plasma-assisted combustion for nozzle
Authors: Chen Chuan , Che Xueke , Zheng Tikai , Chen Qingya , Li Liang , Li Xiuqian 
Published: August 2019

Abstract
Aiming at the structure of small thrust rocket engine injector, a coaxial shear-type dielectric barrier discharge plasma nozzle was designed, and the effects of methane discharge and air discharge on combustion effect under different excitation and different mixing ratio conditions are studied. The results show that: the flashback occurs when the methane discharge voltage is high, the air discharge can broaden the blow off limit of the air/methane diffusion flame, and has the effect of stabilizing the flame and reducing the lift height.
Study on effect of surface roughness on resistance based on results from experiments and simulation with CFD and LBM
Authors: Guo Wenqiang , Hou Guoxiang 
Published: August 2019

Abstract
In this paper, the rotating disk with a diameter of 50mm is selected as a simplified object to study the effect of surface roughness on resistance. The accuracy of different CFD models is studied to reduce the simulation error through rheometer experiment of smooth disk. Then, optimized models are used to calculate the torque of rough disks with different roughness. Compared with results from rheometer experiment, it’s found that smooth disk doesn’t have pressure drag, but rough disk has pressure drag. And the disk surface with roughness of 90μm has the maximum drag reduction rate of 3.26% at speed of 400rpm. There is an uncertain and irregular relationship between drag reduction effect and surface microgroove under different Reynolds number, so, the flow in microgrooves on rough surfaces is simulated for further analysis by LBM. Compared with channel without microgroove, channel with microgroove reduces the velocity gradient on bottom wall and there is vortex in each microgroove. The velocity gradient on bottom wall attains a minimum when the height of microgroove is 90μm, which has the minimum viscous friction, however, the pressure difference between inlet and outlet of channel with microgroove height of 90μm doesn’t reach a minimum. Therefore, when applied to macroscopic objects, the microgrooves, which can reduce the viscous friction, probably increase the total resistance due to the pressure drag.
Effect of Inlet Flow-Guide on Hydraulic Loss of Seawater MHD Propeller with Helical Channel
Authors: Chen Xiaoqiang , Zhao Lingzhi , Peng Aiwu 
Published: August 2019

Abstract
Inlet flow-guide is very important to the hydraulic loss of the whole channel of marine MHD thruster with helical channel. In this paper, variable helix is used as the line-type of flow-guide blade, and helical loop number (N), blade number (n) and blade height (H) (helix height) are established as the main geometric parameters. L
16 (43) orthogonal table was used to design the inlet flow-guide, which contains three factors with four levels of N, n and H. The whole flow filed of helical channel with inlet flow-guide was numerical simulated with Fluent. The results show that the hydraulic loss of the helical channel can be greatly reduced by the inlet flow-guide; The results of orthogonal experimental show that the hydraulic loss of the helical channel is sensitive to the line-type of the guide vane, and the total hydraulic loss increases with the increase of n, increases first and then decreases with the increase of N, and decreases first and then increases with the increase of H.
Calculation and Analysis of Aerodynamic Parameters of Wing Based on NS Equation
Authors: Ma Hongxia 
Published: August 2019

Abstract
The emergence of computational fluid dynamics has greatly simplified the research and design process of aircraft. At present, this technology has become the most popular research field in fluid mechanics and is of great significance to promote the development of China’s aerospace and other undertakings. With the development of computational fluid mechanics, the numerical solution speed of the mean navier-stokes equations (RANS) has been greatly improved. In this paper, the M6 wing is taken as the calculation model, the RANS equation is coupled with the relevant calculation model, the pressure coefficient and aerodynamic characteristics are calculated and analyzed, and relevant conclusions are drawn.
Numerical simulation on high frequency discharge of chemical nonequilibrium argon inductively coupled plasma
Authors: Yu Minghao , Ma Libin , Bai Chuanxin , Liu Kai 
Published: August 2019

AbstractThis paper studied the flow field properties of the 10 kW inductively coupled plasma wind tunnel (ICPWT). The results can be used for the development of the thermal material protection material for re-entry aerospace vehicles. In this paper, the ICP flow under different input powers was numerically simulated, and the flow-field characteristics in the ICP torch under different operating parameters were obtained. The results showed that when the input power is the typical working power i.e. 10 kW, the electron number density in the plasma torch reaches a maximum of 3.23×1021 1/m3, and the electron temperature is also up to 0.99 eV. Besides, the velocity in the plasma torch reaches a maximum of 34.9 m/s, and the translational temperature also reaches a maximum value of 8740 K.
Investigation on the Scale Effect of Air Tanker with Pumping System resistance components
Authors: Xiao Zhijian , Xiao Junqing , Jiang Rong , Wu Bing , Wan Yuxiang 
Published: August 2019

Abstract
The ship viscous flow field of multiple scale models including real scale was calculated by using RANS method and SST k-ω model. The reliability of the method was verified by comparing the computed results with the experimental results at different scales. By studying the scale effect of various resistance components of a air tanker, it was found that the scale effect of total resistance and water resistance of the model with the pumping system was obvious, and the dimensionless air resistance coefficient almost kept constant at the studied range of Reynolds number. The additional resistance coefficient generated by pumping system increased with the increase of Reynolds number, and the resistance coefficients of the baler increased with the increasing Reynolds number.
Design and flow Simulation of compressed Air Energy Storage system in Aquifer
Authors: Liu Can 
Published: August 2019

Abstract
Compressed air energy storage is the most promising energy storage technology at present, and aquifer compressed air energy storage can achieve large-scale storage of compressed air by breaking the dependence of traditional compressed air energy storage on geological conditions such as large rock caves. Based on Kushnir’s study and some hypotheses, the mathematical model of compressed air energy storage in aquifer is established in this paper. Then, taking 3 MW energy storage scale as an example, the energy storage model of underground aquifer with buried depth of 800m in horizontal stratum is established by using numerical simulation method. The initial gas bag formation after gas injection and the parameters of pressure and gas saturation during the system cycle were analyzed. Experimental results show that the pressure and gas saturation change little after a complete cycle, and the effective gas phase volume of the available energy storage and energy release cycle decreases slowly with the cycle going on. The aquifer is widely distributed and well sealed, so it is feasible to store compressed air energy as a gas storage bank.
Numerical Simulation of Internal Flow and External Atomization in Pressure Swirl Nozzle
Authors: Wang Lei , Chen Longfei , Fang Bin 
Published: August 2019

Abstract
A computational fluid dynamics (CFD) study is carried out on the internal flow characteristics of pressure swirl nozzle and the breakup of external liquid film outside the nozzle. The numerical simulation of two-phase flow shows the unsteady characteristics inside the nozzle and the breaking mechanism of liquid film outside the nozzle. In the nozzle, the numerical simulation reveals the three-dimensional velocity distribution in the swirl chamber and the nozzle outlet. At the same time, the study shows that the breakup of liquid film is caused by the circumferential disturbance wave produced by R-T instability under the condition of 0.7 MPa inlet pressure. The influence of inflow characteristics on the instability of liquid film is pointed out.
Unsteady numerical simulation of flap vibration for 30P30N three-element airfoil
Authors: Ding Li , Xu Zhen 
Published: August 2019

Abstract
The pitching motion of NACA0012 airfoil and the flap vibration of 30P30N multi-element airfoil are simulated by using commercial fluid dynamics simulation software Fluent. The influence of flap vibration on lift coefficient and pitch moment coefficient of multi-element airfoil is analyzed. The results show that the influence of flap vibration on pitching moment coefficient of multi-element airfoil is greater. With the increase of flap amplitude, the variation range of lift and moment coefficients gradually increases, while with the increase of frequency, the variation range of lift and moment coefficients gradually decreases, and the hysteresis loop gradually becomes “thin” and its shape tends to ellipse. With the increase of flap vibration frequency, the unsteady effect of flow field increases, and the hysteresis loop may change in reverse direction.
Experimental investigation of flow separation in a planar convergent-divergent nozzle
Authors: Li Yaohua , He Chengjun , Li Jianqiang , Miao Lei , Gao Rongzhao , Liang Jinmin 
Published: August 2019

Abstract
Under the conditions of nozzle pressure ratio (NPR) of 2.79, 2.82 and 2.95, the flow field was observed by dynamic pressure measurement and focusing schlieren technique, and the flow separation characteristics of a planar convergent-divergent nozzle were studied. The results show that as the NPR increases, the nozzle flow structure changes from asymmetric to a symmetrical configuration. Under the condition of NPR=2.79, the flow in the nozzle goes obviously downward to the bottom wall of the nozzle, and the restricted shock separation (RSS) occurs on the bottom wall; under the condition of NPR=2.82 and NPR=2.95, the flow in the nozzle tends to be symmetrical, RSS appears on both the top and bottom walls. Based on spectrum analysis, it is found that there is obvious low-frequency oscillation characteristics near the separation point.
Numerical research on jet tab thrust vector nozzle aerodynamic characteristics
Authors: Cong Rongfei , Ye Youda , Zhao Zhongliang , Wu Junqiang , Zhang Changfeng 
Published: August 2019

Abstract
Jet tab thrust vector nozzle is a unique kind of thrust vector device which generates control force by inserting tab into the nozzle exhaust. The influence of tab geometric parameters on the nozzle aerodynamic characteristics is not clear. In order to meet the requirements of control rate modeling and optimization of jet tab thrust vector control system, a computational study was conducted to investigate the effects of tab geometric parameters which include insertion height, width, axial distance, incline angle on nozzle aerodynamic characteristics. The flow structure of nozzle with different tabs are demonstrated, and thrust vector performance is evaluated. Results indicate that the lateral force coefficient and the thrust loss coefficient increased with the increase of the tab insertion height, the thrust vector efficiency decreased as the insertion height increased; increasing tab width increased the thrust vector efficiency, the thrust vector efficiency increased by 24.8% when the tab width increased form 10mm to 18mm; both increasing axial distance and increasing tilt angle decreased the lateral force and efficiency, in practical application, the axial position and incline angle should be minimized.
Effect of Casing Movement on Flow and Heat Transfer Characteristics of Grooved Blade Tip
Authors: Zhang Yunsong , Liu Yongbao , Li Yujie , He Xing 
Published: August 2019

Abstract
Using numerical simulation method, the influence of casing movement on the flow and heat transfer characteristics in the groove tip has analysed, and the influence of rotation speed and blowing ratio was also considered. The results show that the casing movement reduces the casing temperature at the top of the rib and the Nu peak number at the bottom of the groove, it also reduces the mixing loss from the interaction of coolant and leakage flow. The higher the casing motion speed, the lower the average Nu on the wall surface and the smaller the mixing loss in the gap. Large blowing ratio cooling jet can effectively improve wall heat transfer.
Application of Fluid Dynamics in the Development of Communication Industrialization
Authors: Xu Lingrui , Xiong Xiong 
Published: August 2019

Abstract
Fluid mechanics has made great progress in recent decades, especially in the field of communication engineering, which is an important emerging direction. This paper provides an overview of the main essence and latest progress of this method. At the same time, it also discusses the development of relevant scientific and technological software and its impact on practical industrial applications.
Influence of turbulence boundary condition on pollutant diffusion for a natural draft cooling tower with flue gas injection
Authors: Yang Guangjun , Ding Li , Guo Zhaobing 
Published: August 2019

Abstract
The influence of the specification of turbulence model in equilibrium atmosphere boundary layer (ABL) on the numerical simulation of pollutant diffusion for a natural draft cooling tower with flue gas injection is investigated. The ABL must be considered due to the immense size of cooling tower. The flow field and pollutant distribution under the circumstance of different turbulence boundary conditions are predicted by solving Navier-Stokes (N-S) equations based on shear-stress transport (SST) k-ω turbulence model. The results indicate that the pollutant distribution remains almost unchanged when the turbulence boundary condition changed, it can be inferred that the turbulence boundary condition has little effect on the diffusion of pollutant for other Reynolds Average Navier-Stokes (RANS) turbulence models. Since RANS cannot consider the fluctuation velocity, it is not very suitable for predicting the pollutant diffusion. To more accurately simulate the pollutant propagation and diffusion, the large eddy simulation (LES) model is needed.
A lattice Boltzmann simulation of coalescence-induced droplet jumping on superhydrophobic surfaces
Authors: Ling Fengru , Huang Gang , Tang Hao , Geng Mengmeng , Ye Yutong , Qin Zhangrong 
Published: August 2019

Abstract
The coalescence-induced droplet jumping on superhydrophobic surfaces (SHSs) observed in nature plays a significant role in energy and environmental applications. By using a three-dimensional chemical-potential-based multiphase lattice Boltzmann model, the coalescence-induced jumping of two droplets and multidroplet are systematically simulated and analysed. The results show that the size and the number of droplets and the characteristics of pillared SHSs have a strong influence on the droplet behaviour. The coalesced droplet could only jump under appropriate droplet size and characteristic parameters of SHSs. Furthermore, coalesced droplets are more likely to jump and jump higher on SHSs with larger contact angle and pillar height and smaller distance between two pillars. This work will contribute to understand the phenomenon of the coalescence-induced droplet jumping and provide theoretical guidelines for the design of new SHSs.
The influence of OGV airfoil profile on the TRF
Authors: Li Shulei , Jin Donghai , Gui Xingmin , Li Jinwei 
Published: August 2019

Abstract
The outlet guide vane in a turbine rare frame plays a vital role in de-swirling the flow as well as load-bearing. This paper numerically simulates the performance of the single stage turbine with different airfoil profile design in the outlet guide vane. The result shows that the outlet guide vane with NACA65 profile has the best performance. The pressure growth in the suction side is steady and no obvious separation is found in the flow field.
Study on Flow Field Characteristics of Air Filter Intake System for Heavy Truck
Authors: Shi Pidong , Wang Renren , Cao Fang , Gao Chao , Wang Hongliang , Liu Zhihao 
Published: August 2019

Abstract
A three-dimensional watershed model of the intake system of the air filter for heavy trucks is built. The influence of the structure parameters of the intake pipe and cyclone separator on the flow field characteristics of the intake system is studied by using computational fluid dynamics (CFD) method, the parameters of the forward gas system are optimized. The results show: The internal structure of the intake pipe and cyclone separator is complex, so that pressure loss of the whole flow field is larger, and it affects the performance of the intake system.
Numerical study on the influence of the outlet width of vaneless diffuser on the performance of centrifugal compressor
Authors: Du Linfeng , Pan Yupeng 
Published: August 2019

Abstract
In this paper, the 3D model of the centrifugal compressor is established by Solidworks software at first. Second, the numerical simulation of the centrifugal compressor is carried out by using CFX software. Combined with the simulation results, the conclusion that properly reducing the outlet width of diffuser can effectively restrain the generation of flow separation and reduce the influence of impeller rotation on diffuser is revealed. Finally, the internal flow field structure and machine performance of the diffuser are improved. The research provides a reference for improving the performance and flow field structure of the compressor as well as the design of the vaneless diffuser.
Thermal analysis based on heat transfer equation
Authors: Mao Jie 
Published: August 2019

Abstract
When working in a high temperature environment, people need to wear special clothes to avoid burns. High-temperature special clothing can avoid burns, which greatly improves work safety. In order to design a special garment with high strength, heat insulation and low cost, we need to consider that the thickness of the clothes should not be too thick and increase the cost, and it should not be too thin to affect the function. So, we built a model through micro-element analysis to determine the thickness of the clothes. This allows the garment to reduce costs while ensuring insulation.