Влияние пространственного профилирования лопастей рабочего колеса на характеристики потока в проточной части осевой гидротурбины

Abstract

The results of numerical investigation of the influence of spatial profiling of the runner blade of Kaplan turbine PL20 with the usage of complex circular offset on flow characteristic in flow part are presented. The flow simulation has been carried out on basis of numerical integration of the Reynolds equations with an additional term containing artificial compressibility. The differential two-parameter model of Menter (SST) has been applied to take into account turbulent effects. The investigations have been conducted by means of the software package IPMFlow. The analysis of flow pattern in computational regions with and without the draft tube, as well as dependences of the capacity and efficiency of flow part from offset value at optimum operating condition is presented. It is shown that the application of spatial profiling of the runner blade has improved the efficiency and capacity of flow part of modern hydroturbine more than 0,70 %.