Research On Characteristics Of Hydrodynamic Coupling Torque Converter And Its Influence Factors

As a new hydrodynamic transmission component,hydrodynamic coupling torque converter has not formed a mature product at home or abroad yet.It could be widely used to scraper conveyor,oil drilling machine,light vehicle with the advantages of high efficiency and function of torque conversion compared to torque converter and hydrodynamic coupling.Hydrodynamic coupling torque converter can automatically convert between traction condition and starting condition because the gas-liquid two phase flow in chamber presents the different characteristics in different rotational speed ratios,which is equipped with a guide stator based on hydrodynamic coupling structure.The torque ratio under overload condition and the efficiency value under traction condition are the key performance indicators of the hydrodynamic coupling torque converter,which is determined by the flow channel parameters of hydrodynamic coupling torque converter.At present,no mature theory is formed for the design of fow channel parmeters of hydrodynamic coupling torque converter.In this paper,a hydrodynamic coupling torque converter is designed to meet the matching demand of a scraper conveyor.the influence of the key parameter of channel on its performance is predicted by numerical simulation,the internal flow field and external characteristics through experiment is tested,the accuracy of numerical simulation is proved.The main contents and conclusions are as follows.(1)The overall structure of hydrodynamic coupling torque converter is designed to match a scraper conveyor.The effective diameter is designed based on the requirement of the matching parameter,the shape of chamber and impeller is designed with the reference to hydrodynamic coupling,the conformal mapping method is adopted to design the blades of stator.The original characteristics of hydrodynamic torque coupling converter is preliminarily predicted by numerical simulation.(2)The influence of the arrangement of stator on the performance of hydrodynamic coupling torque converter is studied.Five groups with different kinds of arrangement of stator is designed in the condition of the same blade angle and blade numbers.The gas-liquid two-phase circulation characteristic with five different kinds of arrangement of stator is analysed.Five groups of hydrodynamic coupling torque converter are calculated by CFD numerical simulation.The external characteristics of hydrodynamic coupling torque converter with different kinds of arrangement of stator is obtained,the influence of the arrangement of stator on the external characteristics of hydrodynamic coupling torque converter is analysed.(3)The influence of the key parameter of stator(height of stator,blades number of stator,outlet angle of stator)on the performance of hydrodynamic coupling torque converter is studied.The interval range of height of stator is determined according to the liquid-gas two-phase large/small circulation characteristics,which is calculated by VOF numerical simulation.Scheme of five blades number and five outlet angle of stator is formulated respectively,the influence of five groups of blades number and outlet angle of stator on performance of hydrodynamic coupling torque converter is studied by numerical simulation.The result shows that the comprehensive performance of capacity coefficient,efficiency,torque ratio is better as the outlet angle of stator is 17°,the blades number of stator is 20.(4)The test of internal and external characteristics of hydrodynamic coupling torque converter is completed.Prototype is manufactured.The internal characteristic test system and externa characteristic test system are builded and the test scheme is designed respectively.The gas-liquid two phase circulation characteristics of the hydrodynamic torque coupling converter is tested and compared with the numerical simulation results,the external characteristics of the hydrodynamic torque coupling converter is tested and compared with the simulation results.The gas-liquid two phase circulation characteristics of numerical simulation prediction is almost the same with the test results,the original characteristics of numerical simulation is basically the same with test results,all of which demonstrated the accuracy of the theoretical analysis and simulation of this paper.