管道效应对进气道试验湍流度测量的影响研究

进气道风洞试验中，湍流度由动态压力计算得到，动态压力的测量是否精确与动态压力传感器前方导压通道的管道效应相关。基于管道内流体动力学耗散模型，研究了导压通道对动态压力和湍流度的影响，并通过进气道风洞试验进行了验证。研究结果表明:进气道风洞试验中导压通道的管道效应对湍流度的影响较明显，管道效应会放大动态压力的脉动幅值，导致测量湍流度大于真实湍流度。为了减小管道效应对湍流度的影响，进气道试验中应避免使用导压的方式进行动态压力的测量。如果不可避免地存在导压通道时，在导压通道长度大于5 mm时，须考虑管道效应对湍流度测量的影响，并进行相应的修正。

Research on the effect of tubing on turbulence in inlet wind tunnel test

Turbulence can be calculated through the fluctuating pressure in the inlet wind tunnel test. The accuracy of the fluctuating pressure measurment depends on the tubing ahead of the fluctuating pressure sensors. In this paper, the effects of tubing on turbulence are researched based on the dissipation model of dynamics and are verified by the inlet wind tunnel tests. The research results show that the tubing ahead of the sensor has a serious effect on the turbulence. The amplitude of the fluctuating pressure increases and the measured turbulence is magnified when the effect of tubing exits. In order to eliminate the error brought by the tubing, the way using tubing to measure fluctuating pressure should be avoided in the inlet wind tunnel test. If the tubing is inextricably used in test and the length of tubing is more than 5 mm, the final fluctuating pressure data should be revised.