| Summary: | 碩士 === 遠東科技大學 === 機械工程研究所 === 107 === In this study, the numerical simulation of three-dimensional transient turbulent flow field for the pump body of rotary compressor with rolling piston and R410a refrigerant was carried out by using the CFD commercial software PUMPLINX. Also, the various performances of compressor were calculated based on the simulation results and compared with the measured values to verify the accuracy and reliability of the numerical system used in this paper. Then, the geometric shape parameters of the pump body are planned, and then a series of the flow field simulation, analysis and performance comparison were performed for several pump bodies with different cylinder shapes, different shapes of suction port and different the installation form of suction port. Furthermore, the influence of various geometric parameters of the pump on the flow field and performance of the compressor was discussed, and the better design parameters of the pump geometry were found by comparing the above simulation results.
Firstly, the simulation results of the original compressor shape show that the difference between the numerical simulation and the experimental test results is within ±3%, which proves that the numerical simulation system used in this paper has certain accuracy and feasibility. Furthermore, it is found through the flow field observation that backflow, vortex and supersonic flow occur in the cylinder due to the leakage of the gap between the piston and the cylinder or between the piston and the blade. In addition, by comparing the simulation results of several pump bodies with different geometry parameters, it is found that the better diameter size of suction port is 5mm, which can simultaneously increase the refrigerant flow rate by 0.9%, the output power by 5.4%, and the total efficiency of compressor by 1.5%. The better suction port shape is the nozzle shape; however, the suction port installation mode is little impact on performance. In addition, the cylinder height is reduced, which has little effect on the refrigerant flow rate and the input power; however, if the cylinder height is increased, the output power and efficiency are greatly reduced. Finally, changing the shape of the vent will significantly reduce the refrigerant flow rate.
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