Abstract:

Both numerical simulation and experimental investigation were performed to develop a prediction method for extreme jet flow frequency.Extreme jet flow frequencies of different orders were in the relation of multiples.Numerical simulation could describe truly the motion of wave system and contact surface in the receiving tube.The simulation results of the extreme jet flow frequency were lower than those of experiment，but the error was less than 5%.Moreover，extreme jet flow frequency of each order，which was influenced more greatly by pressure ratio，increased with increasing outlet pressure and pressure ratio.Compared with the condition of the extreme jet flow frequency of the first order，the isentropic refrigeration efficiency was higher under the condition of the second and the third order.The above conclusions provide guidance for the rotary gas wave refrigerator to run stably and effectively in practice.

Key words:

膨胀制冷, 气波制冷机, 射流频率, 数值模拟

摘要：

利用数值模拟和实验探讨了极值射流频率的预测方法。结果表明：各阶极值射流频率之间基本呈倍数关系，数值模拟能够准确描述接受管内波系和接触面的运动，预测的极值射流频率均较实验偏低但误差在5%以内;各阶极值射流频率随着出口压力和膨胀比的增加而增大;第二、三阶极值射流频率下气波机制冷效率较第一阶高。所得结论对实际生产中气波机稳定高效运行具有指导意义。

关键词:

膨胀制冷, 气波制冷机, 射流频率, 数值模拟