スクロール圧縮機の吸入圧力解析(流体工学, 流体機械)

Upon the strong demand of compactness of scroll compressor, compressors become to be driven with larger speed, and gas velocity trends to increase in the suction path. According to this trend, the accurate estimation and reduction of the suction loss become important to realize the more efficient scroll compressor. In this paper, the suction pressure pulsation of scroll compressor is analyzed by computational fluid dynamics (CFD) using finite volume method. The mesh shapes of suction path are defined by involute curves, which constituted scroll compressor. The 2 dimensional analysis program in which the depth of mesh is considered has been developed. The suction losses are analyzed numerically and compared to experimental results. The numerical results agree with experimental results with error of less than 10%. As application of analysis, the effect of inertia supercharging by the conduit added to suction of scroll was examined. With regard to the volumetric efficiency of compressor, the improvements of 1% in 60rps and 1.4% in 70rps are obtained by the effect of inertia supercharging experimentally, and the present numerical analysis is useful to predict those values.