Model Turbine Guide Vane Torque Calculation And Test Verification

Force characteristics of Francis turbine is an important design input data for the structure design of the prototype,whose accuracy and rationality have a direct impact on the safe operation and manufacturing cost.The shape and position of the guide vanes of the turbine directly affect the pressure and torque value of the water flow acting on its surface.In order to calculate the vane strength accurately,reasonable selection of turbine guide vane servomotor and its related series of transmission mechanism,need to know exactly the guide vane in each opening value under the condition of stress,the method of determining the hydraulic force characteristics of commonly used parts of the turbine turbine model test and CFD numerical simulation.This paper takes Jilin Fengman project as the application background and takes vane torque of Francis turbine guide as the object of study.This paper makes a study on the distribution law of vane torque of Francis turbine guide and the influence of guide vane graduation circle to guide vane torque.This paper also studies and verifies the simplified scheme of guide vane torque calculation using a suitable flow.The studies above are based on combination of numerical simulation and experimental method of vane torque of Francis turbine guide.The paper draws the following conclusions.The distribution law of guide vane torque factor from the CFD numerical simulation results is similar to the distribution law from the results of the model test.It is feasible to use CFD method to calculate vane torque.The guide vane torques curve in different graduation circle of guide vane with the same vane airfoil are slightly different.The larger the graduation circle,the greater the vane torque.The calculation method of guide vane torque can be simplified as a calculation method with the same discharge and variable openings.The results calculated at optimal condition discharge are in good agreement with the experimental results.