Dynamics of Scroll Suction Process

Abstract

In this study, scroll compressor suction is modeled as a dynamic process using the differential continuity and steady, isentropic flov equations.Consequently, the effects of kinematics and lov dynamics ar.e predicted and shov that the suction gas actually starts to be compressed before the outer scroll vrap tips seal of the displacement volume of gas at the start of closed compression.Thus, it is possible to obtain a local volumetric efficiency, referenced to inlet conditions, of greater than 100 percent.The model is validated by comparison of the predicted suction pocket pressures vith dynamic pressure measurements.Further, actual mass flow measurements confirm cyclic mass flov rates at suction vhid> ar.e greater than the traditional ideal value.a A $p Starting angle of lnvolute Thickness angle of wraps = 2o: Polar angle to outer tip of fixed, inner wrap surface Local volumetric efficiency at suction Crank angle, or orbit angle position of orbiting scroll Amax Involute wrap angle to outer tip of fixed, outer wrap surface Amo/fi,max Involute wrap angle to outermost surface of moving wrap at ~fi,max p Density of gas