压力波制冷机性能的数值分析

对有关因素如膨胀比ε、射流激励频率、管外换热状况等对压力波制冷机制冷效率的影响进行了数值研究 .结果表明 ,在ε<5时制冷效率随ε的增大而提高 ,在一定工况下存在一个最佳的射流激励频率 fopt,强化管外传热可使制冷效率明显提高 .当射流激励频率偏离 fopt 时 ,压力波制冷机将出现排气倒流现象 .

Numerical investigation of performance of the pressure wave refrigerator

The influences of factors such as expansion rate, exciting frequency, heat transfer condition, etc. on refrigeration efficiency of the pressure wave refrigerator are investigated numerically. The results indicate that the refrigeration efficiency increases with the increase of expansion rate and there exists an optimal exciting frequency( fopt ) for a constant operating condition. The refrigeration efficiency is increased significantly by means of improving the heat transfer condition outside the tube' s wall and the discharged gas will come back into the tube when the exciting frequency drifts off fopt.