Reverse Modeling Design And Numerical Simulation Of Flow Field Of Torque Converter

Research and development of Speed control equipment for Fluid machinery such as pump become an effective method of saving energy, as the development of large power and high speed pump equipment. Multi Stage Variable-Speed Drive has many advantages such as Transferring high power, high efficiency, long life and continuous speed regulation, which is mainly used in the speed control and energy saving of large pump. The adjustable guide vane torque converter is the core component of Multi Stage Variable-Speed Drive Speed control. Currently, the hydraulic models of the high performance adjustable guide vane torque converter are few in our country, which could not meet the requirements of research of high-technology products. Taking a type of torque converter as the research object, a three-dimensional model of the pump impeller blade of torque converter was building using the technology of reverse modeling in this paper. The numerical calculation of the flow field is carried out using CFX, exploring the characteristics of the flow field, optimizing design of the pump impeller blade, researching law of pressure fluctuation in the flow field.Firstly, the reverse modeling of torque converter pump impeller blade was building using Pro/e software in the paper, and using the bladegen software repairing the pump impeller blade.Secondly, based on the results of steady calculation in the flow field, the characteristic of the flow field is studied. On this basis, studying the influence on the characteristics of the torque converter of the inlet and outlet pump impeller blade angle, and studying the influence on the characteristics of the torque converter when modified for cylindrical blade. The results show that the efficiency of the converter is improving 0.66% and startup torque-converting coefficient is increasing 1.03% when the pump impeller outlet blade angle is changed to 95 degrees. Optimizing the pump impeller inlet blade angle by axial velocity in cross section following the Counter potential flow distribution, at low speed ratio(i=0.3), the converter efficiency is improving 3.8%. When the pump impeller blade modification for cylindrical blade, at the guide vane opening is 30%, speed ratio i=0.3, converter efficiency is improving 1.2% than the original model, the pump impeller torque coefficient is decreasing 0.96%. On the optimal condition, the converter efficiency is similarly, pump impeller torque coefficient is decreasing 12%.Lastly, the transient calculation of the converter flow field is carried out, analyzing the variation law of the flow field pressure pulsation. The results showed, at traction condition, the higher of the ratio, the smaller of t he pressure fluctuation amplitude, the lower of the frequency. The results is opposite at beyond the braking condition, the higher of the ratio, the greater of the pressure fluctuation amplitude, the higher of the frequency. The flow field pressure fluctua tion in pump impeller outlet and turbine inlet is serious, which indicates that rotor-stator interaction of the pump impeller and turbine is serious.