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Influence of Cavitation on Unsteady vortical flows in a Side Channel Pump

Chinese Journal of Mechanical Engineering 2023年第1期36卷 171-189页

作者： Yefang Wang Fan Zhang Shouqi Yuan Ke Chen Feng Hong Desmond Appiah National Research Center of Pumps Jiangsu UniversityZhenjiang212013China College of Mechanical&Power Engineering China Three Gorges UniversityYichang443002China

Previous investigation on side channel pump mainly concentrates on parameter optimization and internal unsteady vortical ***,cavitation is prone to occur in a side channel pump,which is a challenging issue in promoting *** the present study,the cavitating flow is investigated numerically by the turbulence model of SAS combined with the Zwart cavitation *** vapors inside the side channel pump firstly occur in the impeller passage near the inlet and then spread gradually to the downstream passages with the decrease of ***,a strong adverse pressure gradient is presented at the end of the cavity closure region,which leads to cavity shedding from the *** small scaled vortices in each passage reduce significantly and gather into larger vortices due to the *** the three terms of vorticity transport equation with the vapor volume fraction and vorticity distributions,it is found that the stretching term is dominant and responsible for the vorticity production and evolution in cavitating *** addition,the magnitudes of the stretching term decrease once the cavitation occurs,while the values of dilatation are high in the cavity region and increase with the decreasing *** though the magnitude of the baroclinic torque term is smaller than vortex stretching and dilatation terms,it is important for the vorticity production along the cavity surface and near the cavity closure *** pressure fluctuations in the impeller and side channel tend to be stronger due to the *** primary frequency of monitor points in the impeller is 24.94 Hz and in the side channel is 598.05 *** are quite corresponding to the shaft frequency of 25 Hz(fshaft=1/n=25 Hz)and the blade frequency of 600 Hz(fblade=Z/n=600 Hz)*** study complements the investigation on cavitation in the side channel pump,which could provide the theoretical foundation for further optimization of performance.

关键词： Side channel pump vortical flows Cavitation Vortex-cavitation interaction Pressure fluctuation

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Vortex Capturing Using PNS-WENO Schemes in Uniform and Non Uniform Mesh Formulations

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Advances in Applied Mathematics and Mechanics 2010年第4期2卷 399-429页

作者： Demian De Feo Ning Qin Trevor J.Birch Sheffield University Aerodynamics and Thermofluids Group SheffiledUK Defence Science and Technology Laboratory FarnboroughUK

High order approximations of the vortical flowfield and resulting aerodynamic coefficients of complex supersonic vortical flows,are computed using the Implicit Parabolized Navier-Stokes solver(IMPNS).Third and fifth order Weighted Essentially Non-oscillating(WENO)schemes for evenly spaced and for stretched structured meshes are employed for the approximate Riemann solution of the inviscid cross flow *** approximate Riemann solution is obtained using the Osher and Solomon solver and the one-equation Spalart-Allmaras turbulence model is modified for an improved strain-vorticity *** indicate that even on much coarser meshes the 5th order PNS-WENO-Spalart-Allmaras approach may achieve results that are superior to previously published full Navier-Stokes solutions that employ a two-equation RANS model but the additional computational demand of schemes for non-uniform grids,may not be justifiable for smoothly varying *** proposed PNS-WENO scheme combination provides a novel approach that is fast,accurate and robust,and that can substantially reduce numerical dissipation and improve the resolution of the vortical structures.

关键词： PNS solutions WENO method vortical flows supersonic flows

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