流れ解析によるポンプ吸込水槽内の水中渦予測手法の開発 : 予測モデルの定常解析への適用(流体工学,流体機械)

概要

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A numerical method for predicting submerged vortex cavitation in a pump sump is presented. In the present method, a global flowfield around vortices is determined by the help of numerical simulation of fluid dynamics. In many practical cases, the viscous core radius of a submerged vortex is very small compared to numerical grid spaces. To compensate for the lack of vortex resolution in the global solution, a vortex model, which is the exact solution of Navier-Stocks equations in a stretching vortical flow, is applied to the local flowfields around analytically identified vortex positions. Using circulation and axial velocity gradient calculated from global flowfields and prescribed fluid viscosity, the minimum pressure in the vortex core is calculated. It is found that the predicted values agree well with the experimental ones in terms of a critical inlet velocity at cavitation inception.
社団法人日本機械学会の論文
2002-03-25