The roots compressor is a kind of rotary compressors, it is applied widely in mechanical engineering, chemical industry, aerospace industry and other fields with its high speed, long life and mechanical efficiency. In the article, a new combination rotor profile curve of the roots compressor was designed by reviewing the relevant literatures, the 2D finite element modal was established and a transient CFD numerical simulation was performed for a roots compressor by means of dynamic mesh technique. The varying tendency of mass flow rate, the velocity vector and static pressure distribution of the roots compressor were obtained and analyzed.
To assess piston’s thermal loads, the direct and effective method is to calculate piston’s temperature distribution. A key point in calculating the temperature field of a piston is the determination of heat transfer boundary conditions of each side, especially the gas side. The thermal boundaries of a piston consist of the piston top side (combustion side), the crevice surfaces, the piston ring land and skirt outside surface, piston underside and pin hole side.The calculating methods for the heat transfer boundary conditions of engine piston are studied according to the theoretical analysis of heat transfer of engine piston, which can be taken as a reference for providing precise boundary conditions for the research on piston’s temperature field.
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