回冷式逆布雷顿空气制冷机的试验分析  

Experimental analysis on the performance of a regenerative brayton refrigeration cycle

作　　者：赵红利[1] 侯予[1] 习兰[1] 刘秀芳[1,2] 

机构地区：[1]西安交通大学制冷与低温工程研究所,西安710049 [2]河南理工大学机械与动力工程学院,河南焦作454000

出　　处：《哈尔滨工业大学学报》2009年第5期113-116,共4页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(50206015)

摘　　要：为对透平机械中的流动及传热问题进行研究,建立可靠的设计方法与修正模型,并为多目标非线性优化、人工神经网络和遗传算法等理论分析提供可靠、系统、详实的试验数据,对小型逆布雷顿循环空气制冷机系统及其关键部件-气体轴承透平膨胀机和高效紧凑换热器进行了热力性能试验,分析了各运行参数及几何结构的影响,考核了新型弹性支承动压气体轴承的机械性能,并进行了24.6×104r/min超速试验.试验结果表明:该空气制冷机膨胀机可在22×104r/min转速下长期稳定工作,出口温度和系统温降可达-101℃和122℃,效率达到60%,各部件运行参数匹配良好.The thermodynamic performance of a small air refrigerator and its components was experimentally studied to provide reliable and detailed data for the research on the flow and heat transfer in turbomachinery, and for the design and optimization of air refrigerator. The effects of operation structural parameters on the overall performance of the air refrigerator and its key components （turbo-expander and compact heat exchanger） were presented. Moreover, mechanical characteristics of the compliant foil bearings were examined, and overspeed test was conducted at 24. 6× 10^4 r/min. Results show that the turbo-expander can work stably at 22 × 10^4 r/rain with the efficiency of 60%. The lowest temperature of - 101 ℃ is obtained at the outlet of the turbo-ex- pander, and the temperature difference between the system inlet and the turbo-expander outlet has reached 122 ℃.

关 键 词：空气制冷机 气体轴承透平膨胀机 高效紧凑换热器 试验分析 

分 类 号：TB651[一般工业技术—制冷工程]