低速风洞非定常风特性模型及验证  

Model and Verification of Unsteady Wind Characteristics in Low Speed Wind Tunnel

作　　者：徐让书[1] 葛宁 王治敏[1] XU Rang-shu;GE Ning;WANG Zhi-min(Faculty of Aerospace Engineering,Shenyang Aerospace University,Liaoning Shenyang 110136,China)

机构地区：[1]沈阳航空航天大学航空航天工程学部,辽宁沈阳110136

出　　处：《机械设计与制造》2018年第9期29-32,共4页Machinery Design & Manufacture

摘　　要：位于大气边界层中的建筑结构受到非定常的风速影响会导致其结构破坏。为研究该现象,在风洞实验室中恰当地模拟大气边界层环境,不但要实现稳定风速的模拟,而且变动风速也要满足一定要求,即是阵风谱(Gust spectrum)的模拟。旨在通过分析影响风洞实验段风速的因素,采用改变动力段对电机输入的功率来实现要求的阵风谱,并在实际风洞中进行验证。结合流体力学原理,通过对空气以及动力系统进行分析来建立守恒方程,应用Matlab软件进行数值计算。模拟出在风速达到稳定后,输入正弦电压得到实验段的风速。模拟结果表明,在实验段风速呈现正弦曲线,经快速傅里叶分析与电压频率一致。经试验验证后与模拟结果吻合,振幅与风洞对应输入功率所标定的风速一致,故可用该方法模拟产生规定阵风谱下的非定常风。Building structure in the atmospheric boundary layer influenced by the unsteady wind speed could cause its structural destruction.In order to properly simulate the atmospheric boundary layer environment in the wind tunnel laboratory,not only the simulation of steady wind speed need to be realized,but the variation is also required whitch also means simulation of gust spectrum.It aims to analyze the factors that affect the wind speed of wind tunnel test section,and to change the power input of the motor to achieve the required wind gust spectrum,and verified in the actual wind tunnel.Based on the principle of fluid mechanics to establish conservation equation,adopting Matlab to calculate numerical calculation by analysing the air and power system.It simulated speed of experimental section by inputing sine voltage after the wind speed had been stable.Simulation results show that,in the experimental section,the wind velocity is sinusoidal,and it is frequency consistent with voltage’s through the fast Fourier analysis.The test results are consistent with the simulation results,the amplitude of the wind tunnel is consistent with the corresponding input power of the calibration,so the method can be used to simulate the wind spectrum under the provisions of the wind.

关 键 词：大气边界层风洞 阵风谱 非定常流动 数值计算 

分 类 号：TH16[机械工程—机械制造及自动化] V211[航空宇航科学与技术—航空宇航推进理论与工程]