单螺杆膨胀机内有机工质泄漏特性的数值研究  

Numerical Study of Leakage Characteristics of Organic Fluids in Single Screw Expander

作　　者：沈丽丽[1,2,3] 王伟 吴玉庭[1,2,3] 马重芳[1,2,3] SHEN Lili;WANG Wei;WU Yuting;MA Chongfang(College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China;Key LaboratmT of Enhanced Heat Transfer and Energy Conservation,Ministry of Education,Beijing 100124,China;Key Laboratory of Heat Transfer and Energy Conversion,Beijing Municipality,Beijing 100124,China)

机构地区：[1]北京工业大学环境与能源工程学院,北京100124 [2]传热强化与过程节能教育部重点实验室,北京100124 [3]传热与能源利用北京市重点实验室,北京100124

出　　处：《北京工业大学学报》2018年第10期1340-1346,共7页Journal of Beijing University of Technology

基　　金：国家"973"计划资助项目(2013CB228306);北京工业大学研究生科技基金资助项目(ykj-2016-00051)

摘　　要：为了研究单螺杆膨胀机内泄漏特性,建立单螺杆膨胀机热力学工作过程的数学模型和油气混合的两相泄漏模型,分析间隙高度对各泄漏通道泄漏量的影响,并比较3种有机工质R123、R134a、R245fa在不同转速和进气压力下对单螺杆膨胀机容积效率和泄漏量的影响.结果表明,9条泄漏通道中,螺杆与壳体之间的泄漏量占主要部分,其次是星轮与螺槽之间的泄漏量,星轮与壳体之间的泄漏量较小.增加转速和进气压力均可增大单螺杆膨胀机的容积效率.在相同的工况条件下,以R123为工质的单螺杆膨胀机容积利用率最高,其次是R245fa,R134a最低.In order to investigate the internal leakage characteristics of the expander, a mathematical model of the thermodynamic working process and a two-phase leakage model for gas-oil flow were established. The influence of clearance height on the leakage path of different leakage path was analyzed, and the influence of rotational speed and inlet pressure on the volumetric efficiency and leakage flow rate under three organic fluids （i. e. R123, R134 and R245fa） was compared. The results show that the leakage through the clearance gap between screw rotor and shell accounts for the most part, followed by the leakage through the clearance gap between screw groove and gate rotor, and the leakage through the clearance gap between gate rotor and shell is relatively small. The volumetric efficiency increases with the rotational speed and the inlet pressure. The volumetric efficiency of the single screw expander using the 11123 as the working fluid is the best under the same working conditions, followed by R245fa and R134a.

关 键 词：单螺杆膨胀机 泄漏量 容积效率 有机工质 数值研究 

分 类 号：TK123[动力工程及工程热物理—工程热物理]