インデューサ入口上流における逆流に伴う渦構造に関するLES解析(流体工学,流体機械)

概要

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Turbopump inducers often have swirling backflow under a wide range of flow rates because they are designed with a certain angle of attack even at the design point in order to attain high cavitation performance. When the flow rate is decreased, the backflow region extends upstream and may cause various problems by interacting with upstream elements. It is also known that the backflow vortex structure occurs in the shear layer between the main flow and the swirling backflow. In this study, we investigated the backflow vortex structure at the inlet of the inducer by Commputational Fluid Dynamics (CFD). It is difficult to simulate unsteady phenomena such as backflow or backflow vortices by Reynolds Averaged Navier-Stokes Simulation (RANS). For this reason, we applied Large Eddy Simulation (LES) to simulate backflow vortices and to elucidate their fundamental characteristics. It is shown that the results agree reasonably with experiments.
社団法人日本機械学会の論文
2004-12-25