子午面粘性流れ解析に基づく空力設計法による遠心圧縮機の空力性能向上

抄録

This paper presents an aerodynamic design method for centrifugal compressor using meridional viscous flow analysis and one-dimensional inverse method. The meridional viscous flow analysis can estimate the flow distribution around the blade and extract design blade loading distribution for the original blade. The blade shape has been designed by the present design method with improved blade loading distribution. The improved blade loading distribution is generated based on the original design blade loading distribution which was extracted from the meridional viscous flow analysis result and the improved blade loading near the leading edge is lower than the original one. The designed and original blades have been investigated by three-dimensional Reynolds Averaged Navier Stokes (3D-RANS) analyses and experiments. The numerical result shows the flow separation near the leading edge is successfully suppressed as intended in the design concept. As a result, the aerodynamic performances obtained both from the 3D-RANS analyses and the experiments in the designed blade are improved.