Simulation And Optimization Design Of Automotive Electronic Water Pump Based On CFD

In order to promote the development and application of advanced energy-saving technologies for automobiles in China and continuously reduce the fuel consumption of passenger vehicles in China,relevant national departments have issued relevant laws and regulations to vigorously promote the development of electric vehicles.The whole vehicle thermal management system is of great significance to increase the range of electric vehicles and improve the running stability and driving comfort.At present,the thermal management system of electric vehicle is developing from independent module to system engineering,and high integration has become the trend in the future.As the core component of the thermal management system,the performance of the electronic water pump directly affects the thermal management effect of the whole vehicle.At present,most of the automotive electronic water pumps on the market have the problem of low efficiency,so it is of great significance to improve the efficiency of the electronic water pump by optimizing the structural parameters of the automotive electronic water pump.This paper takes the new energy vehicle electronic water pump provided by an enterprise as the research object,and optimizes the performance of the water pump without changing its external size and structure.The main contents and conclusions are as follows:1 The impeller and volute are divided into unstructured grids,and the inlet section is divided into structured grids.The electronic water pump is numerically simulated by fluent.The simulation results are compared with the experimental results to verify the accuracy of the simulation model.The comparison results show that the relative error is less than 5% at 0.4Q ～ 1.2Q,indicating that the simulation accuracy is high,and the simulation model can be used for subsequent calculation.2 Taking the maximum theoretical head,maximum efficiency and no hump in the flow head curve of the electronic water pump as the optimization objectives,five main impeller structural parameters of the electronic water pump are selected as the optimization variables,and their value ranges are calculated.The ARMOEA in the multi-objective optimization platform Plat EMO is used for multi-objective optimization,and the optimal combination of structural parameters is selected from the Pareto solution set for modeling and simulation.3 Different flow points are selected to simulate the automotive electronic water pump before and after optimization,and the external characteristics of the electronic water pump before and after optimization and the internal flow near the design working point are compared and analyzed.The comparison results show that the optimized head and efficiency are improved,the hump is eliminated,and the internal flow is significantly improved.4 Usually,new energy vehicles need two or three electronic water pumps,which are respectively responsible for the transportation of coolant in battery circuit,air conditioning circuit and control element circuit.They are generally directly fixed on the frame and occupy a lot of space.Therefore,an integrated design of thermal management module is proposed,which integrates the structures of electronic water pump,electronic water valve,kettle and chiller,reduces the weight and saves a lot of installation space,and introduces the flow of cooling and heating circuit in detail.To sum up,this paper optimizes the design of automobile electronic water pump impeller,and the optimization effect is good.The combination of evolutionary algorithm and structural optimization of electronic water pump provides an important reference and basis for the optimization and development of automotive electronics;Embedded integrated module has a broad application prospect in the future new energy vehicle market.