Abstract
The relative positional relationship between the stay vanes and guide vanes is researched to analyze the impact on the hydraulic performance of the Turbine based on N-S equations and RNG k-ε turbulence model under the conditions of sandy water with the numerical simulation method. There are main five kinds of the relative positional relationship between the dual cascades is used to analyse the trends of the distribution about the pressure and velocity. The relative circumferential positions between the dual cascades have obviously effect on the flow verified. And the velocity vector and the pressure distribution on the surface of the guide vanes are studied further. The results show that energy performance is best if little circumferential position differences between the dual cascades in two typical conditions. However, the distribution about the pressure and velocity is uneven on the active surface of guide vanes, exacerbating the local abrasion of the vanes.
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