HFC410A两级滑片膨胀机性能参数的模拟计算与实验研究  

Numerical and Experimental Investigation for Performance of HFC410A Two-Stage Rotary Vane Expander

作　　者：乔亦圆 王猛[2] 曹锋[1] 束鹏程[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]中国航天科技集团公司第六研究院,西安710100

出　　处：《西安交通大学学报》2015年第6期109-114,共6页Journal of Xi'an Jiaotong University

摘　　要：为了提高制冷系统的性能系数,减小传统节流元件对系统造成的不可逆节流损失,研究两级滑片式膨胀机在中小型制冷系统中的应用,对其进行变转速、变冷凝压力以及变过冷度等实验研究,并与数值模拟结果进行对比。结果表明:提高转速可以减小两级滑片膨胀机的泄漏量,从而提高容积效率,但会增大摩擦损失,使等熵效率和输出功先提高后降低,转速为1 400r·min-1系统性能系数提高率取得最大值;提高冷凝压力增大了膨胀机进出口压差,使容积效率降低,由于摩擦损失和泄漏损失随压比变化,输出功和等熵效率先增后减;减小过冷度更利于系统性能,过冷度平均每减小1℃回收功可提高2.2%,对过冷度较低的系统性能的提升更显著。由此可见,两级滑片膨胀机在中小型制冷系统的应用是可行的,合理调节转速、冷凝压力以及过冷度可以提高系统的整体性能。To improve coefficient of performance（COP）of refrigerating system and reduce irreversible system throttle loss due to the traditional restricting element,the experiments for two-stage rotary vane expander in small and medium refrigerating systems were conducted in the case of variable speed,condensing pressure and subcooling degree,and the experimental data were compared with the numerical simulation.The results show that the leakage of two-stage rotary vane expander can be reduced by increasing the revolving speed,the volumetric efficiency thus rises,and the output work and isentropic efficiency rise firstly and then drop for increasing frictional resistance.The system COP reaches the maximum for revolving speed of 1 400r·min-1.The increasing condensing pressure results in decreasing volumetric efficiency for the increased differential pressure between the expander import and export,and the isentropic efficiency and the output work rise firstly and then drop.The decreasing subcooling facilitates improving system performance,the output work rises by 2.2% when the subcooling degree decreases by 1 ℃.The two-stage rotary vane expander is feasible for small and medium refrigerating systems,and the system performance can be improved by adjusting revolving speed,condensing pressure and subcooling degree.

关 键 词：两级滑片膨胀机 制冷系统 容积效率 性能系数 

分 类 号：TB653[一般工业技术—制冷工程]