Refrigeration Compressor Process Simulation And Energy-saving Technology Research And Development

In this paper, reciprocating compressors were studyed on the basis of a new kind of fluid-structure interaction techniques. The system was decomposed into fluid field and solid field. Through multi-dimensional transient flow field and differential equations of motion body control, the system was integrated. By controlling the main parameters of the compressor working parts, optimization of cooling capacity, power and cooling of performance was proposed, while obtaining a variety of structural optimization measures. The main research contents and conclusions obtained as following:(1) Based on the quality, momentum and energy conservation equations of the flow field and differential equations of plate vibration model, fluid-sturcture interaction wais proposed to study the compressor working process. That method can achieve high efficiency, high-quality simulation results and greatly shorten the development time of new structures.(2) Based on fluid-structure interactions, the operation processes of compressors with variable thickness of suction valves were simulated to get the influence on the cooling capacity, the compression work and the cooling factor. The optimal criterias for thicknesses of suction valves were proposed. Expansion and suction process were analysed.The presence of large flow velocity at pores induces overheating. The temperature variations of the refrigerant in cylinder provided a reference for the realization of the approximate isothermal compression process.(3) Simulations of the compress process with varied thickness of exhaust valves or with different limited lift height for exhaust valves were completed. Stress analysises of the exhaust valves caused by the pressure differences betweent the exhaust chamber and the cylinder were finished to verify their impact and fatigue properties. The optimum thickness of the exhaust valve was determined by the closing time of valves. Based on the effective flow area, to ensure exhaust valves could close timely, the optimal exhaust valve lift height was determined. The temperature variation of the refrigerant during the compression and exhaust process cylinder was the basis to achieve approximate isothermal compression process.(4) The approximate isothermal process can be achieved using cooling approaches. Oil passage was designed. Experiment was done to study of the impact of variable volume of oil to the exhaust gas temperature, cooling capacity, power consumption, ultimately to optimaze the oil volume.In this paper, fluid-structure interaction method was applied to study the key issues of the compressors. It is expected to provide a reference for the new compressor design, modeling and performance optimization.