【作者】 马静； 赵远扬； 李连生； 束鹏程；

【Author】 Ma Jing, Zhao Yuanyang, Li Liansheng, Shu Pengcheng (NERC of Fluid Machinery and Compressors, Xi’an Jiaotong University, 710049, Xi’an)

【机构】 西安交通大学流体机械及压缩机国家工程研究中心；

【摘要】 本文研究了喷嘴类型、几何参数和喷嘴出口两相流速度等因素对制冷系统能量回收用冲击式膨胀机性能的影响。通过试验,得出了喷嘴出口两相制冷剂的速度,从而得出喷嘴和叶轮各自的效率以及对膨胀机回收效率的影响,提出了改进方法。研究结果表明,在制冷系统中使用冲击式膨胀机代替节流阀的方案可行,试验测得膨胀机效率可达32%;三种不同结构的喷嘴中,拉伐尔喷嘴对膨胀机能量回收最为有利;依据均相模型设计的喷嘴比滑速比模型的性能要好,喷嘴内制冷剂气液两相流速接近相等;喷嘴出口处两相制冷剂流速是影响能量回收量的主要因素,试验工况下约为85m/s,喷嘴效率约为60%,与单相流相比也要低很多,需进一步提高喷嘴效率。更多还原

【Abstract】 Theoretical analysis and research about the power recovery system of high pressure refrigeration system with R410a refrigerant has been done. And the experimental rig is set up to test the performance of the power-recovery system. The efficiency of the expander can be measured, which can reach to 32%. Author analyzes the impact of nozzle and impeller on the expander’s efficiency respectively. Theoretical analysis and experimental results showed that the two-phase fluid velocity out of nozzle is about 85m/s. Nozzle efficiency has great impact on the amount of recovery power and then affects expander’s efficiency. So, next, experimental research and analysis of the nozzle should be emphasized to get more data for optimizing the structure and efficiency of the nozzle, and finally improve the recovery efficiency of the expander.更多还原