摘要
为了提高大型混流式水轮机的性能,水轮机转轮希望引水室之蜗壳产生有适当的角运动量、流体轴对称且固定导叶的后流损失为最小状态的流体。蜗壳的角运动量可以由固定导叶入口流动旋回速度V_(u-si)与半径R_i来评价,固定导叶入射角α_(si)还支配了其导叶的后流状况。为要评价蜗壳与座环中三维粘性流体的流动特性,流体一体整体化数值解析(CFD)是非常必要的。
In order to maximize the hydraulic performance of a Francis turbine, the spiral case shall produce circumferentially uniform anguhr momentum adequate to the runner with the minimum stay vane wakes. Angular momentum in the spiral case can be assessed by the circumferential velocity V_(u-si) of the flow and the radius R_(si) at the stay vane inlet. Stay vane wake can be controlled by the incidence angle α_(si) of the spiral case flow to the stay vane inlet. A lumpsum flow analysis with CFD is indispensable to assess the 3-D viscous flow through a spiral case with stay vane.
出处
《华中电力》
2003年第6期1-3,共3页
Central China Electric Power
基金
国家自然科学基金(59979007)
