Cooling Water Pump Design And Flow Simulation Analysis

Cooling water pump is the core component of cooling system in automotive engine and it has great impact on engine dynamics,economy,and reliability.Due to layout and space constraints,designers generally use the method of increasing the speed and increasing the flow rate to reduce the overall size and volume of the automotive cooling water pump,which leads to narrow flow path,complicated geometry of flow path and large variation of flow direction,thus affecting the comprehensive performance of cooling water pump.There are more than 200 million vehicles in Chia,but the investigation and statistical data show that the existing engine cooling water pumps have high energy consumption and low efficiency in different degrees,which are not conducive to energy saving and emission reduction.Therefore,it is of great significance to master the design and analysis of the automobile cooling water pump,to master the flow law of the cooling medium in the pump,to improve the performance of the pump and to ensure the efficient and reliable operation of the engine.The thesis took the improved design of an engine cooling water pump as the research goal.Through digital design,simulation analysis,sample development and performance testing,the prototype cooling water and its performance have been enhanced.As a result,the quality of the cooling water pump has been enhanced.The main work of this paper is as follows:(1)It developed a prototype cooling water pump design.Based on the basic theory of centrifugal pumps,hydraulic model database and similar design methods,the original impeller structure was changed without changing the installation boundary conditions.What's more,the parameters of the blades were adjusted,and the water flow guiding structure at the outlet of the volute was increased.The selection of shaft bearings and water seals lay the foundation for subsequent design of numerical simulations,flow field analysis and prototype development.(2)A three-dimensional model of a cooling water pump was constructed.The Solid Works software was used to digitally design the cooling water pump body structure and flow channel geometry.Through the data exchange interface between Solid Works and ANSYS Workbench and the MESH function module,the mesh of the cooling water pump flow channel model was realized.(3)The numerical calculation of the original and improved parts of the cooling water pump was performed.Using NS control equations,standard k-? turbulence model,SIMPLEC algorithm,and CFX fluid analysis software,the original parts and the improved parts were simulated in multiple working conditions.The pressure distribution map,speed vector diagram and external characteristic curve of the flow field in the cooling water pump are obtained.Finally,Comparative analysis shows that the improved parts are superior to the original in terms of lift,efficiency and other indicators.(4)Comparing the experimental data of the cooling water pump before and after the discovery,when the rotating speed of cooling water pump design point speed was 3000r/min and the flow rate was 90L/min,the lift was increased to about 4.06 meters,and the efficiency was increased to 21.72%;When the rotating speed was 6000r/min and the flow rate was 189.48L/min,the head lifted to 18.46 meters,and the efficiency increased to 34.04%.So,the expected research goal of increasing efficiency and decreasing consumption has been achieved.