Numerical Simulation And Parameter Optimization Of Combined Profile Scroll Compressor

Scroll compressor has unique advantages in automotive air conditioning field owing to its small volume,light weight and low noise.Scroll is the core of scroll compressor.According to the different types of scroll profile,scroll compressor can be roughly divided into single profile scroll compressor and combined profile scroll compressor.In the past,many researches on scroll compressor focused on the single profile scroll compressor,and the researches on the combined profile scroll compressor was relatively less.Based on numerical simulation and theoretical calculation,the paper mainly studies the inner flow field of circular involute-variable radius of base circle of involute-circular involute of combined profile scroll compressor,and carries out multi-objective optimization about its performance parameters.The flow field pressure,inlet and outlet mass flow rate of circular involute-variable radius of base circle of involute-circular involute of combined profile scroll compressor are comparatively analyzed with circular involute-high order curve-circular involute of combined profile scroll compressor and circular involute scroll compressor.The gas pressure caused deformation of circular involute-variable radius of base circle of involute-circular involute of combined profile scroll compressor is compared with circular involute scroll compressor.The specific research contents are mainly divided into the following two aspects:Firstly,numerical simulation for the internal flow field of scroll compressor,and the statics analysis are carried out.According to the simulation results,the research conclusions can be summarized as follows:(1).for circular involute-variable radius of base circle of involute-circular involute of combined profile scroll compressor,The pressure distribution of the flow field in the scroll chamber of scroll compressor is relatively uniform and the temperature distribution is not uniform,and the velocity is the largest at the meshing clearance of orbiting and static scroll;(2).in comparison of three kinds of profiles of scroll compressor having the same turn of vortex,it is found that circular involute-variable radius of base circle of involute-circular involute of combined profile scroll compressor bear minimum average pressure,which is favorable to improve the fatigue life of scroll compressor,get maximum average mass flow rate,which is favorable to meet the power demand of scroll compressor;(3).The maximum deformation of circular involute-variable radius of base circle of involutecircular involute of combined profile scroll under gas pressure occurs at the position of tooth head,and the deformation degree is less than circular involute scroll.Secondly,based on genetic algorithm,the optimization for circular involutevariable radius of base circle of involute-circular involute of combined profile scroll compressor which takes stroke volume and area utilization coefficient as the optimization objective is carried out.The results of the optimization are acquired.Compared with the circular involute scroll compressor with the same scroll turn,the area utilization coefficient and stroke volume of circular involute-variable radius of base circle of involute-circular involute of combined profile scroll compressor are larger,which reflects its advantages.Based on the theoretical calculation and drawing with MATLAB software,the analysis shows that:(1).the stroke volume can be increased by increasing the range of variable radius of base circle of involute in a certain range;(2).The area utilization coefficient can be improved by enlarging the range of the variable radius of base circle of involute in the suction chamber and decreasing the range of the variable radius of base circle of involute in the compression chamber.