G402 ベーンレスディフューザ付き遠心圧縮機羽根車における渦流れ構造の数値解析(2)(GS4 流体構造,界面,一般セッション)

概要

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The flow field in a centrifugal compressor is highly three-dimensional and complicated by the strong secondary flows. In order to improve the performance and operating range, it is indispensable to elucidate the three-dimensional flow phenomena. In this paper, the flow fields in a centrifugal compressor impeller with vaneless diffuser have been investigated by numerical flow analysis. Three-dimensional separated and vortical flow fields were analyzed by Reynolds-averaged Navier-Stokes simulations (RANS) using an unfactored implicit upwind relaxation scheme. As the turbulence model k-ω two-equation model was employed. To elucidate the complicated flow fields, vortex structures were identified by the critical point theory. From numerical analysis results , it was found that the tip leakage vortex breakdown occurred and the leakage vortex of the full-blade interacts with the splitter-blade leading edge at the operating point of maximum pressure rise. This phenomenon causes the large loss and significant impact on the total performance characteristics.
一般社団法人日本機械学会の論文
2007-11-17