高温热泵涡旋压缩机流动特性及型线优化OA

The scroll compressor,as the core component of the high temperature heat pump system,has important thermodynamic impacts on the system.This study focused on high-temperature heat pump operating conditions characterized by elevated temperatures and high compression ratios.A transient simulation model of the scroll compressor was developed and validated against experimental data to confirm its feasibility and accuracy.A variable cross-section scroll profile was proposed,and the refrigerant flow dynamics within the scroll wrap were systematically analyzed.The results demonstrate that vortices predominantly form at the outer periphery of the scroll wrap and within compression chambers,primarily attributable to the orbital motion of the orbiting scroll and tangential refrigerant leakage.These vortices intensify initially and subsequently diminish with increasing rotation angle.Specifically,severe vortex phenomena occurs at rotation angle from 0° to 180°,with mitigation observed at 270°.Compared to conventional circular arc involute profiles,the variable-radius circular arc involute profile enhances volumetric efficiency by up to 2.1％,while the maximum chamber pressure reaches 1.52 MPa,exceeding discharge pressure by only 0.32 MPa.When rotational speed increases from 2 500 r/min to 3 300 r/min,the variable-radius profile exhibits an average volumetric efficiency improvement of 2.4％ over the conventional profile,with a more pronounced enhancement of 3.04％ observed at lower speeds 2 500 r/min.