Horizontal Francis Turbine Simulation Of Flow Characteristics And Noise Analysis

Based on horizontal Francis turbine as the research object using numerical simulation methods to analyze the flow characteristics of the hydraulic turbine and the resulting noise is analyzed, the research work is mainly manifested in the following respects:(1) Establishes the solid model of the turbine by using the modeling software UGNX, and then obtains the 3D numerical model of the turbine through Boolean operation.. The whole flow channel of turbine is divided into water inlet, guide vane, runner, and outlet water. The four zones are respectively introduced into ICEM AN SYS to divide the unstructured mesh and then the whole flow passage is obtained.(2) In this paper, by using the FLUENT software for numerical simulation of flow field, at first calculated for the steady and steady numerical convergence is reached, then use the flow field results as the initial condition by large eddy simulation of non steady calculation of turbine flow field of instantaneous results and on the parameters of the flow field of the pressure and vorticity and velocity analysis.In the whole flow passage of the characteristic location to set point of reference for monitoring pressure and other parameters change with time and drawing process curve and the for Fourier transform spectrum analysis, it has certain reference value for the study of mixed flow turbine vibration phenomenon.(3) The vibration characteristic of turbine runner were studied respectively by runner in air and in water vibration frequency and mode, then the results with consideration of prestress and factor rotation when the results were compared and analyzed. At the same time, simulae the Francis turbine impeller and guide leaf flow induced vibration phenomenon, analyzed in consideration of flow solid coupling effect of runner and displacement, stress and other parameters change.(4) The paper predict the flow noise with the method of comparison.The research of this paper has some reference for the study of the efficiency, vibration and noise of Francis turbine.