Rüzgar tünelinde bilgisayarla balans değerleri
Computer aided balance experiments in wind tunnels
Yazar: ALİ LEVENT HASANREİSOĞLU
Danışman: DOÇ.DR. M. ADİL YÜKSELEN
İstanbul Teknik Üniversitesi / Fen Bilimleri Enstitüsü
Derece: Yüksek Lisans, 1995
Konu: Uçak Mühendisliği = Aircraft Engineering
Dizin: Rüzgar tüneli balansı = Wind tunnel balance

Özet:
For incompressible flow, Ap"o = -pU2 eB. Corrections to model quantities: ACA = -(2-M2)CAeB, Where Ca is a non-dimensional force and moment coefficients other than drag coefficients Co. For two-dimensional airfoils: ACD = -[ (1 + 0.4M2) es + (2 - M2) eB] CD. For three-dimensional models: ACD = -(1 + 0.4M2) es Coo - (2 - M2) eB CD. In both cases: ACp = [2-(2-M2)Cp]eB Data-Acquisition In this method, a computer and special data-acquisition cards controlled from this computer are used. The wind tunnel balances is connect this card with a proper signal amplifier to obtain a true level of signal. And the aid of computer programs the all process including calibration, making experiments, controlling models inside wind tunnel, and obtain and analyze aerodynamics forces and moment coefficients. By the use of data-acquisition system, also we can short the time period of experiment and calibration process. While doing experiment, all data that comes from wind tunnel balances through the data-acquisition card, are the electrical signal and they transform to integer values between -2047 and 2048 or 0 and 4096 by this system in real time or using DMA access. When the first, integer values could be obtained, any can be able to any operation on this data by computer program easily. RPV's Wind Tunnel Tests Testing of RPV in wind tunnel is considered as a proof of wind tunnel test system and also RPV's aerodynamic coefficients were needed to be obtained. The 1/6 scaled of real RPV's was chosen because of blockage affects and prototype of RPV's was made from composite materials. xvn

Abstract:
While experiments, wind tunnel velocity was calculated from pressure manometer that works Bernoulli principle; PT = Ps + q, Here q is dynamic pressure and equivalent of i-pU2. While experiments dynamic pressure is read from "U" manometer of which inlet is in entrance room, outlet is in test section. Of course a proper exchange must be apply because reading values are mm Water or mmAlcohol. Ambient temperature and pressure also must be measure while experiments. Results Results of wind tunnel testing have been analyzed by use of computer program and obtained all needed coefficients as both tables and graphics. According to these results, designing of RPV will continue with some changes. But more important result about the experimental system is that it is more practical, efficient and works truly. xvmFor incompressible flow, Ap"o = -pU2 eB. Corrections to model quantities: ACA = -(2-M2)CAeB, Where Ca is a non-dimensional force and moment coefficients other than drag coefficients Co. For two-dimensional airfoils: ACD = -[ (1 + 0.4M2) es + (2 - M2) eB] CD. For three-dimensional models: ACD = -(1 + 0.4M2) es Coo - (2 - M2) eB CD. In both cases: ACp = [2-(2-M2)Cp]eB Data-Acquisition In this method, a computer and special data-acquisition cards controlled from this computer are used. The wind tunnel balances is connect this card with a proper signal amplifier to obtain a true level of signal. And the aid of computer programs the all process including calibration, making experiments, controlling models inside wind tunnel, and obtain and analyze aerodynamics forces and moment coefficients. By the use of data-acquisition system, also we can short the time period of experiment and calibration process. While doing experiment, all data that comes from wind tunnel balances through the data-acquisition card, are the electrical signal and they transform to integer values between -2047 and 2048 or 0 and 4096 by this system in real time or using DMA access. When the first, integer values could be obtained, any can be able to any operation on this data by computer program easily. RPV's Wind Tunnel Tests Testing of RPV in wind tunnel is considered as a proof of wind tunnel test system and also RPV's aerodynamic coefficients were needed to be obtained. The 1/6 scaled of real RPV's was chosen because of blockage affects and prototype of RPV's was made from composite materials. xvnWhile experiments, wind tunnel velocity was calculated from pressure manometer that works Bernoulli principle; PT = Ps + q, Here q is dynamic pressure and equivalent of i-pU2. While experiments dynamic pressure is read from "U" manometer of which inlet is in entrance room, outlet is in test section. Of course a proper exchange must be apply because reading values are mm Water or mmAlcohol. Ambient temperature and pressure also must be measure while experiments. Results Results of wind tunnel testing have been analyzed by use of computer program and obtained all needed coefficients as both tables and graphics. According to these results, designing of RPV will continue with some changes. But more important result about the experimental system is that it is more practical, efficient and works truly. xvmFor incompressible flow, Ap"o = -pU2 eB. Corrections to model quantities: ACA = -(2-M2)CAeB, Where Ca is a non-dimensional force and moment coefficients other than drag coefficients Co. For two-dimensional airfoils: ACD = -[ (1 + 0.4M2) es + (2 - M2) eB] CD. For three-dimensional models: ACD = -(1 + 0.4M2) es Coo - (2 - M2) eB CD. In both cases: ACp = [2-(2-M2)Cp]eB Data-Acquisition In this method, a computer and special data-acquisition cards controlled from this computer are used. The wind tunnel balances is connect this card with a proper signal amplifier to obtain a true level of signal. And the aid of computer programs the all process including calibration, making experiments, controlling models inside wind tunnel, and obtain and analyze aerodynamics forces and moment coefficients. By the use of data-acquisition system, also we can short the time period of experiment and calibration process. While doing experiment, all data that comes from wind tunnel balances through the data-acquisition card, are the electrical signal and they transform to integer values between -2047 and 2048 or 0 and 4096 by this system in real time or using DMA access. When the first, integer values could be obtained, any can be able to any operation on this data by computer program easily. RPV's Wind Tunnel Tests Testing of RPV in wind tunnel is considered as a proof of wind tunnel test system and also RPV's aerodynamic coefficients were needed to be obtained. The 1/6 scaled of real RPV's was chosen because of blockage affects and prototype of RPV's was made from composite materials. xvnWhile experiments, wind tunnel velocity was calculated from pressure manometer that works Bernoulli principle; PT = Ps + q, Here q is dynamic pressure and equivalent of i-pU2. While experiments dynamic pressure is read from "U" manometer of which inlet is in entrance room, outlet is in test section. Of course a proper exchange must be apply because reading values are mm Water or mmAlcohol. Ambient temperature and pressure also must be measure while experiments. Results Results of wind tunnel testing have been analyzed by use of computer program and obtained all needed coefficients as both tables and graphics. According to these results, designing of RPV will continue with some changes. But more important result about the experimental system is that it is more practical, efficient and works truly. xvmFor incompressible flow, Ap"o = -pU2 eB. Corrections to model quantities: ACA = -(2-M2)CAeB, Where Ca is a non-dimensional force and moment coefficients other than drag coefficients Co. For two-dimensional airfoils: ACD = -[ (1 + 0.4M2) es + (2 - M2) eB] CD. For three-dimensional models: ACD = -(1 + 0.4M2) es Coo - (2 - M2) eB CD. In both cases: ACp = [2-(2-M2)Cp]eB Data-Acquisition In this method, a computer and special data-acquisition cards controlled from this computer are used. The wind tunnel balances is connect this card with a proper signal amplifier to obtain a true level of signal. And the aid of computer programs the all process including calibration, making experiments, controlling models inside wind tunnel, and obtain and analyze aerodynamics forces and moment coefficients. By the use of data-acquisition system, also we can short the time period of experiment and calibration process. While doing experiment, all data that comes from wind tunnel balances through the data-acquisition card, are the electrical signal and they transform to integer values between -2047 and 2048 or 0 and 4096 by this system in real time or using DMA access. When the first, integer values could be obtained, any can be able to any operation on this data by computer program easily. RPV's Wind Tunnel Tests Testing of RPV in wind tunnel is considered as a proof of wind tunnel test system and also RPV's aerodynamic coefficients were needed to be obtained. The 1/6 scaled of real RPV's was chosen because of blockage affects and prototype of RPV's was made from composite materials. xvnWhile experiments, wind tunnel velocity was calculated from pressure manometer that works Bernoulli principle; PT = Ps + q, Here q is dynamic pressure and equivalent of i-pU2. While experiments dynamic pressure is read from "U" manometer of which inlet is in entrance room, outlet is in test section. Of course a proper exchange must be apply because reading values are mm Water or mmAlcohol. Ambient temperature and pressure also must be measure while experiments. Results Results of wind tunnel testing have been analyzed by use of computer program and obtained all needed coefficients as both tables and graphics. According to these results, designing of RPV will continue with some changes. But more important result about the experimental system is that it is more practical, efficient and works truly. xvm