Numerical Simulation Research Of The Scroll Compressor And The Investigation Of Its Working Process

Scroll compressor is a kind of positive displacement compressor. The compressor’s working characters including moving boundaries, pairs of meshing points and simultaneous working for different chambers; it is a kind of 3D unsteady compressible gas flow process.The gas leakage between different working chambers has very important influences on the compression process. To analyze this problem, there is a mathematical model which including the leakage has been established based on the scroll wrap profile and its movement characteristic. After the calculation for the whole working cycle, the effects on the scroll compressor caused by the radial leakage, tangential leakage, and their coupling impact can be obtained. There is also an investigation on the changing rules of pressure and temperature under different meshing clearance.It is hard to measure the state parameters in the scroll compressor with an experiment. In order to avoid the problem, a method of 3D numerical simulation has been established. It can solve the inharmonious grid generation and the periodical outlet blocking caused by the orbiting scroll’s movement. The numerical simulation can analyze the suction, compression and the discharge process, and it can obtain the pressure, temperature, velocity and leakage distribution; the correctness of this method can be proved by the comparison with theoretical results. Moreover, in this paper through the setting of cooling source boundary, the numerical simulation can analyze the working process with internal cooling, which is much closer to the practice working conditions.Based on the flow simulation, a method for the stress and deformation analysis can be established using the finite elements software. Through which ordinary segmental application method for boundary conditions can be replaced, improved its accuracy. The stress and deformation distribution are investigated for scrolls under thermal load and pressure load, andthe maximum stress and deformation location have been found.All these investigations provide important references for improving flow status predication and the design level of scroll compressor.