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为探究混流式水轮机改造前后的能量性能、空化性能及水力稳定性,基于流场数值模拟方法,对改造前后的水轮机进行全流道三维定常空化湍流计算及全流道三维非定常湍流计算。结果表明,改造后的水轮机临界空化系数降低13%,效率提高6.2%,且改造后水轮机转轮与活动导叶交界面处4个监测点脉动幅值最大降低17.8%,最小降低7.1%,该水轮机组的抗空化空蚀性能及可靠性均得到极大的提高,对混流式水轮机组的改造有一定的指导作用。
In order to investigate the energy performance, cavitation performance and hydraulic stability of Francis turbine before and after retrofit, based on the numerical simulation of flow field, three-dimensional turbulence calculation of full runner and turbulent calculation of three-dimensional flow field of full runner before and after reconstruction . The results show that the critical cavitation coefficient of hydro turbine after the transformation is reduced by 13% and the efficiency is improved by 6.2%. The pulsation amplitude of the four monitoring points at the interface between turbine runner and movable guide vane is reduced by 17.8% and the minimum is reduced by 7.1% Cavitation erosion and cavitation performance and reliability of the turbine have been greatly improved, which has a certain guiding role for the retrofit of Francis turbine.