TURBULENCE INTENSITY AND LENGTH SCALE MEASUREMENTS IN MULTISTAGE COMPRESSORS

This paper describes the measurement and processing of turbulence data from multistage low-speed compressors. Measurements were made at the same relative positions in three four-stage compressors, each having d ifferent levels of the design stage lending coefficient. A new method of data processing to calculate turbulance intensities and integral le ngth scales is outlined. Using this method, integral length scales hav e been measured in turbomachinery flows for the first time. It is show n how the turbulence intensity and integral length scale vary with pos ition in the blade passage, with changing flow coefficient and with th e value of the design stage loaning coefficient. The results have been used to specify representative inlet conditions for experimental rigs and to improve the application of CFD turbulence models to turbomachi nery modeling.