Numerical Simulation By CFD\CAE And Experiment Investigation Of Oil Pump

The inscribed gear pump is one kind of oil pump, which consists of pump body, pump cover and gears. It is widely used in the range of Vehicles. With the development of computational fluid dynamical (CFD) and finite element analysis technology, it is possible to utilize the simulation results to analyze the internal flow and design the oil pump. In this paper, a lot of researches about internal flow and contact stress of gears were made with softwares of FLUNT and ANSYA/LS-DYNA. A new method was applied in the design of oil pump.The research of this paper is divided into the flowing parts:Firstly, a summary about concepts, content and development trend of CDF was made. The current CFD soft wares were introduced.Secondly, there were the correlative knowledge about the time averaged Reynolds equation, the criterion k ?εmodel, the SIMPLE method, the technology of unstructured mesh, the terminal condition and the modeling method.Thirdly, geometry modeling of the pump was made and meshes were divided with GIMBIT, then the flow filed was investigated using FLUNT, a commercial available CFD code. As result, lots of internal flow filed of outlet of the gear pump was obtained, including velocity magnitude and pressure magnitude. Many important phenomenas of flow were observed from the simulation results. The performance curve of the pump was obtained by numerical simulation was compared with the experimental data. They were good coincidence. The simulation results provided important theoretical basis for investigating the factors, which affect the efficiency of oil pump. This could help to improve the design of inscribed gear pump to achieve a high efficiency and reduce the noise.In addition, the contact stress of a set of gears was research particularly using ANSYS/LS-DYNA. The result showed the max stress points and gave the method for optimization.