基于有限元计算的洞壁干扰修正方法研究

Research on Computational Method of Wall Interference and Correction in Wind Tunnel Experiment

在低速风洞试验时,洞壁干扰效应将影响全流场,它对于风洞试验数据的准度有着不可忽视的作用。针对GAW—1翼型,采用有限元的方法,利用ANSYS商用计算软件模拟该翼型在有风洞壁和无风洞壁情况下的二维流场,从而计算出洞壁干扰对该翼型气动力的影响。通过与美国Langley中心试验数据的对比,表明在没有分离或分离区很小的状态下,该方法能很好的模拟翼型的绕流场,从而得到较为准确的洞壁干扰修正量。该方法划分网格简单,易于掌握,具有很好的计算效率,非常适合工程单位使用。

Wall interference effect influences the whole flow field during important rule to the accuracy of experiment data. Commercial computational subsonic wind tunnel test. it plays an software ANSYS which is based on Finite Element Methods is applied to simulate the flow field around the GAW-1 aerofoil with and without the wind tunnel walls. The computational area was divided into three parts. The area with Part 1, part 3 and part 2 simulated the condition for far field. The area only with part 2 simulated the condition in wind tunnel. So, meshes near the air- foil were the same between two cases. Then influence of wall interference on aerodynamic is calculated. Compared with the experimental data from Langley Center, it is verified that the method well simulates the flow field around aemfoil under conditions of no flow separation or small flow separation and accurate wall interference correction is obtained. And this method makes the dividing of mashes easy to be commanded and suitable to be used in engineering projects with high efficiency.