皮托管测量影响因素分析 II. 全压孔与静压孔的影响

为了讨论皮托管全压孔和静压孔几何参数对其测量特性的影响,采用试验和数值模拟相结合的方法,对不同型号的皮托管进行了研究.结果表明:对于皮托管全压,在流速较低时,由较小的全压孔测得的全压较接近参考值,而在流速较大时,大多数全压孔的测量值误差都比较大;对于皮托管静压,由较小外径的检测杆测得的静压值较接近参考值,静压孔不宜布置在太靠近测头或竖直检测杆的地方.这些结论为优化皮托管的测量提供了指导.

On the influencing factors in a Pitot tube measurement II. Influence of total and static ports

Experiments and numerical simulations were conducted on various Pitot tubes in order to study the effect of the geometrical parameters on their measurement characteristics. The results show that for the total pressures of a Pitot tube, those values obtained from a small total port were closer to the reference value in the lower velocity, whereas in the higher velocity, most measured results were of large errors. As for the static pressures of a Pitot tube, those values obtained from a smaller air horn were closer to the reference value, and it is noted that the static ports can not be located too near to the tip and end of the air horn. These findings provide guidance for optimizing the performance of a Pitot tube under nonstandard conditions.