摘要
气体泄漏及间隙传热会导致制冷机性能恶化,因此间隙密封技术是气动分置式斯特林制冷机的一项关键技术。对三种不同间隙密封结构展开研究,搭建Sage模型分析结构参数对制冷机性能的影响,模拟结果显示:间隙高度H不仅影响泄漏率,还与穿梭损失及泵气损失相关;双段式间隙密封的密封1长度比例越大,制冷量越大。当长度比例及密封1、间隙1高度分别为0.7-0.3,10μm,500μm时,双段式间隙密封结构性能达到最优。与单段式间隙密封相比,双段式间隙密封结构的制冷量与COP提高9%和21%;与三段式间隙密封相比,双段式间隙密封结构简单,加工方便,因此在设计膨胀气缸与活塞间隙密封时,优选该结构作为斯特林制冷机密封结构。
Gas leakage and heat transfer in the gap will cause the performance of the refrigerator to deteriorate, so the gap sealing technology is a key technology of the pneumatic split Stirling cooler. In this paper, three different gap seal structures were studied, and Sage model was built to analyze the effect of structural parameters on the performance of the cooler. The simulation results show that the gap height H not only affects the leakage rate, but also is related to the shuttle loss and pumping loss;In the double-segment gap seal, the greater the length ratio of sealed seal 1, the better cooling capacity. When the length ratio,the height of seal 1 and the height of gap 1 are 0.7-0.3, 10μm, 500μm respectively, the performance of the double-segment gap seal structure becomes optimized. Compared with the single-stage gap seal, the cooling capacity and COP of the double-stage gap seal structure are increased by 9% and 21%.Compared with the three-segment gap seal, the double-segment gap seal structure is simpler and the processing is more convenient. In designing the gap seal between the expansion cylinder and the piston, this structure is preferably used as a Stirling cooler seal structure.
作者
倪贤灿
陈曦
郑朴
刘振
Ni Xiancan;Chen Xi;Zheng Pu;Liu Zhen(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《低温与超导》
CAS
北大核心
2021年第1期1-5,15,共6页
Cryogenics and Superconductivity
基金
国家“十三五”装备预研领域基金(61404140204)资助。
