Leakage research on supercritical carbon dioxide fluid in rolling piston expander

作     者：TIAN Hua MA YiTai LI MinXia LIU ShengChun WANG KaiYang 

作者机构：State Key Laboratory of EngineTianjin UniversityTianjin 300072China Thermal Energy Research InstituteTianjin UniversityTianjin 300072China Tianjin Key Laboratory of Refrigeration TechnologyTianjin University of CommerceTianjin 300134China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2012年第55卷第6期

页      面：1711-1718页

核心收录：

学科分类：081704[工学-应用化学] 080704[工学-流体机械及工程] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 081701[工学-化学工程] 

基　　金：supported by the National Natural Science Foundation of China (Grant No. 50676064) 

主　　题：leakage supercritical carbon dioxide liquid rolling piston expander leakage model 

摘      要：The leakage research on supercritical carbon dioxide fluid in rolling piston expander was investigated *** expander instead of throttle valve is an important way to improve the efficiency of carbon dioxide refrigeration ***,the supercritical fluid leakage in expander is serious and is the main factor affecting the expander s *** paper presented and compared four classic leakage *** analysis indicated that laminar leakage model is suitable in leakage simulation of expander.A leakage test system,including the leakage test part which has two types of leakage specimens with different gaps ranging from 5 to 15 m,was *** experimental results indicated that lubricant film played an important *** the leakage clearance of cylindrical specimen was 5 m,the mass flow rate of leakage was about 0.88 g *** data was 3.638 g s-1 with leakage clearance being 10 m and 7.11g s-1 with leakage clearance being 15 m.A modified leakage model was developed,whose average deviation was within 10% compared with the experimental *** last,this paper simulated the leakage in rolling piston expander presented by Tian et al.(2010).The leakage between rolling piston and cylinder was the most serious part with the value up to 0.04 kg s-1.