Reynolds Stress Tensor Measurements in a Centrifugal Compressor Vaned Diffuser

Ali Pinarbasi, Mark W. Johnson
1996 Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General   unpublished
Measurements of the full Reynolds stress tensor have been made throughout the vaned diffuser of a low speed centrifugal compressor. Results are presented close to the impeller exit plane and the vane leading edge plane at three inter vane positions. The results show that the vanes have a significant influence on the flow in the vaneless space. The mixing out of the blade wakes is enhanced and hence the Reynolds stress levels drop rapidly between the impeller exit and the vane leading edge. The
more » ... leading edge. The flow also exhibits high levels of anisotropicity, particularly at the mid-vane position. This suggests that standard turbulence models are inadequate for modelling these flows using CFD and full Reynolds stress turbulence models are required. NOMENCLATURE
doi:10.1115/96-gt-228 fatcat:fhckx3efn5gybackz6sdfz3qxy