The Reynolds number effects on performance of a CDA geometry in a linear compressor cascade setup is presented. A set of highly- resolved Large Eddy Simulations at different Reynolds numbers, from low operating conditions to design conditions is performed, with two of the simulations including incident wakes at engine relevant reduced frequencies.The focus of this work is to investigate loss variation of a modern blade geometry by applying the novel entropy analysis introduced by Zhao and Sandberg (2019). The loss breakdown analysis is applied to both the whole blade, and in parts to different carefully selected volumes, such as the suction and pressure surface boundary layers, to gain additional insight. The investigation will not only present new insight into the effects of Reynolds number on loss development over a CDA cascade but also exhibit and highlight the usefulness of the Entropy analysis applied to compressors.The simulations are performed at Reynolds numbers between 300,000 and 1,000,000 at a Mach number of 0.7. The cases are based on work by Lurie and Breeze-Stringfellow (2015) and aim to leverage the new Entropy analysis to break down the loss production of the stator into its different components. The loss analysis highlights regions of increased loss production and the effects of Reynolds number on the location and strength of different flow processes, such as transition and separation. The effects of incident wakes are also captured using this analysis technique and detailed in the paper.

Highly Resolved Simulations of a Cda Compressor Cascade: Effect of Reynolds Number on Losses

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

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