【摘要】 由于具有环保优势,近年来自然工质二氧化碳越来越受到关注．但二氧化碳工质应用的跨临界系统存在的最大缺点是节流损失大,导致系统循环性能系数较低．对二氧化碳跨临界摆动转子膨胀机进行了理论分析,为开发高效率膨胀机代替节流阀减小节流损失,提高系统效率提供理论帮助．对膨胀机摆动转子进行了受力分析的研究,建立了摆动转子膨胀机的受力方程,对摆动转子进行了受力计算,结果表明膨胀机的摆杆两侧摩擦力很大,导致摩擦损失增大．更多还原

【Abstract】 CO2 has to work at the supercritical region and therefore results in large throttling loss and the low performance efficiency of the CO2 transcritical cycle for the practical refrigeration application. In this study, a transcritical carbon dioxide swing expander is analyzed in order to develop high efficiency expanders to replace the throttling valve in the CO2 transcritical cycle and improve the coefficient of performance of the CO2 cycle. Forces on the swing piston are analyzed and the force equations are founded. The results indicate that friction on both sides of the swing blade is large, which causes the increase of friction loss.更多还原