| In recent years,with the increasingly severe greenhouse effect,the emission indicators of fuel vehicles continue to increase,the pursuit of environmentally friendly vehicles has become a new trend.The electric vehicle industry came into being and developed rapidly.As the core component of electric vehicles,the performance of electric air conditioners is a key factor restricting the development of electric vehicles.As the third-generation positive displacement compressor,scroll compressor has the advantages of small volume,high efficiency and low noise.At present,it has strong competitiveness in the selection of compressors in the field of electric vehicle air conditioning.However,the flow field parameters in the working chamber of the scroll compressor are difficult to obtain during operation.Therefore,obtaining the flow field law during the meshing process of the dynamic and static scroll disks through numerical simulation has become one of the hot topics in scroll compressor research.This article takes scroll compressor of a company in Chongqing as the research object,the main work is as follows:(1)The basic control equations of the heat transfer model,leakage model and flow field simulation of the scroll compressor are established,and from the three-dimensional solid model of the scroll compressor,the dynamic and static vortex of the circular involute scroll compressor With the rotating disk as the object,a three-dimensional flow field model with moving boundary and axial vortex disk meshing was established.(2)Using R134 a as the working medium,using the RNG k-ε model;using the CFD dynamic grid technology to set the flow field boundary,and performing two-dimensional and three-dimensional numerical simulations on the working chamber of the scroll compressor to obtain the fluid in the working chamber The dynamic distribution law of the periodic changes of the pressure,temperature and velocity of flow with time,the reasons for the uneven distribution of pressure,temperature and velocity in the cavity are discussed,and the gas flow state during the exhaust process under the 3D simulation is analyzed.Simulation and comparative analysis of the working fluid distribution of the compressor working cavity under different non-integer cycles(2.25,3.25,4.25)and different speeds(3000r / min,4500 r / min,6000 r / min)are: In the future,the optimization design of the scroll compressor geometry structure will provide a theoretical basis.(3)The three-dimensional solid model of the movable scroll disk shell is established.Through the static module and thermal analysis module in the workbench,the stress distribution of the movable scroll disk under gas load and temperature load and coupling action is analyzed.And the deformation law,the calculation results found the maximum deformation position and maximum stress distribution of the movable scroll under the action of single load and coupled load.Through the transient simulation of the flow field in the working cavity of the scroll compressor and the strain simulation of the movable scroll shell,it is obtained that the closer the change in the working cavity of the scroll compressor is to the central compression chamber,the pressure and temperature of the gas The higher,the velocity distribution is related to the leakage gap.The velocity reaches the maximum value at the leakage gap and changes in a gradient.With the increase of the number of turns and the speed,the pressure and temperature also increase,but the general distribution has basically not changed.In the strain simulation of the shell,it can be seen that the vortex tooth head has the largest deformation value under any load,and the tooth head position is also the part where the stress distribution and deformation are relatively dense.Through the research of this paper,it has certain reference value for the optimization and selection of the working chamber shell of the scroll compressor in the future. |
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