论文部分内容阅读
脉冲管冷端和热端的层流化元件是脉冲管制冷机的重要部分。本文从流体力学、热力学出发，分析了小孔型脉冲管热端的流动过程和热力过程，确定了小孔型脉冲管的制冷机理。在此基础上，分析表明在脉冲管热端存在射流现象和涡流现象，导致一种气流混合的损失。本文称之为射流损失。设计了几种改进结构，实验验证了这种损失的存在同时也揭示了改进方法的有效性。
The pulse fluid tube cold end and hot end of the laminar flow element is a pulse tube refrigerator important part. Based on hydrodynamics and thermodynamics, this paper analyzes the flow and thermodynamic process of small-bore pulse tube hot end and determines the cooling mechanism of small-bore pulse tube. On this basis, the analysis shows that there is a jet phenomenon and a vortex phenomenon at the hot end of the pulse tube, resulting in a loss of mixed gas flow. This article is called jet loss. Several improved structures were designed. The existence of this loss was verified by experiments and the effectiveness of the improved method was also revealed.