摘要
用激光多普勒测速仪 (LDA)测量紊流的平均流速时带有系统误差。迄今为止的有关理论研究是不完整的。本文导出了一组准确的理论公式 ,既适用于有方向识别功能的LDA ,也适用于无方向识别功能的LDA。文章讨论了平均流速的测量误差及紊流度的测量误差 ,同时还给出了这些误差的修正方法。
There is a bias in the measurement of the average velocity of turbulent flow with Laser Doppler Anemometer (LDA). The existing theoretical research about this problem is inadequate. The exact analytical solution is derived, which applies to the LDA with direction detection or without direction detection. Besides, not only the bias of the average velocity but also that of the turbulence grade is discussed. The correction procedure of the bias is also given.
出处
《计量学报》
CSCD
北大核心
2002年第2期118-121,共4页
Acta Metrologica Sinica
