总压管在超音速流场测量中的影响

总压管提供了一种简便快捷的测量流体平均流场的方法 ,分析其在超音速测量中的影响具有重要意义。从二维轴对称的 N- S方程出发 ,利用二阶精度有限体积法和 S- A湍流模型对喷嘴的超声速自由射流流场以及在其不同位置处加入总压管后的流场进行了数值模拟对比实验 ,模拟结果显示了总压管对超音速流场结构的影响 ,并得到了利用总压管测量超音速自由射流流场结构时 ,在一定区域内误差较小 ,但在超音速向亚声速过渡的区域内误差却较大的结论

Effects of pitot tube on the measurement of supersonic flow

The time averaged velocities in fluid flow can be measured simply and conveniently by investigating the effect of the pitot tube in supersonic flow. The contrastive numerical simulation between the free supersonic air flow and the pitot tube at different positions in supersonic air flow was performed using the N S equation, second order accurate finite volume method, and Spalart Allmaras turbulence model. The numerical results of the influence of the pitot tube on supersonic flow structure show that the measurement error of supersonic flow structure by using pitot tube in determinate region is small, but the error is large in the transition region from supersonic to subsonic velocity.