气体分配器结构对压力波制冷机性能影响的研究

摘要

By means of a single-tube set-up, the influence of some factors, i.e.relative depth of jet hole in the gas distribution ( b/d) , interval distance between oscillatory tube and jet hole (δ) and misalignment angles between the central axises of nozzle and oscillatory tube (ψ) , on performance of pressure wave refrigerator were studied exper-imentally in this paper.In this experiment, the range of pressure ratioε=2~6, relative length of the oscillatory tube L/d=437.5 and jet flow pulsing frequency f=10~240Hz.The results showed that refrigeration efficiency of the pres-sure wave refrigerator (η) was firstly increased and then decreased when b/d was increased, but increasingδandψwould causeηsudden drop.Under the experimental condition in this paper, the recommend value of b/d was 0.5.%在膨胀比ε＝2～6、射流激励频率f＝10～240 Hz范围内，研究了气体分配器喷射孔相对深度b／d、振荡管与喷射孔的间距δ和振荡管轴线与喷管中心线错位角度ψ等结构参数对压力波制冷机性能的影响。实验结果表明：压力波制冷机的制冷效率η随b／d的增加先增大后减小，存在一个合适的相对充气时间比范围，在本文的实验范围内，喷射孔相对深度b／d推荐值为0.5，而增大δ与ψ值均会导致η急剧下降，所得结论对压力波制冷机的优化设计有一定指导意义。