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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Experimental and numerical investigations of an orifice type cryogenic pulse tube refrigerator
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Experimental and numerical investigations of an orifice type cryogenic pulse tube refrigerator

机译：孔板式低温脉冲管制冷机的实验与数值研究

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摘要

A helium filled orifice type pulse tube refrigerator (OPTR) was designed, built and operated to provide cryogenic cooling. The OTPR is a traveling wave thermoacoustic refrigerator that operates on a modified reverse Stirling cycle. The experimental studies are carried out to characterize the performance of the OPTR at various values of the mean pressure of helium (0.35 MPa-2.2 MPa), amplitudes of pressure oscillations, frequencies of operation and sizes of orifice opening. A detailed time-dependent axisymmetric computational fluid dynamic (CFD) model of the OPTR is also developed to predict its performance. In the CFD model, the continuity, momentum and energy equations are solved for both the refrigerant gas (helium) and the porous media regions (the regenerator and the three heat-exchangers) in the OPTR. An improved representation of heat transfer in the porous media is achieved by employing a thermal non-equilibrium model to couple the gas and solid (porous media) energy equations. The computational results are compared with specific experimental results to validate the numerical model. The model predictions show better temporal comparisons with the experimental results when the effects of wall thicknesses and natural convective losses of the various components of the OPTR to the surroundings are included in the model.
机译：设计，制造和运行充氦孔口型脉冲管制冷机（OPTR）以提供低温冷却。 OTPR是一种行波热声制冷机，它以改进的反向斯特林循环运行。进行实验研究以表征OPTR在氦气平均压力（0.35 MPa-2.2 MPa），压力振荡幅度，工作频率和孔口尺寸的各种值下的性能。还开发了详细的随时间变化的轴对称计算流体动力学（CFD）模型来预测其性能。在CFD模型中，求解了OPTR中制冷剂气体（氦气）和多孔介质区域（蓄热器和三个热交换器）的连续性，动量和能量方程。通过采用热非平衡模型耦合气体和固体（多孔介质）能量方程，可以更好地表示多孔介质中的热传递。将计算结果与特定的实验结果进行比较，以验证数值模型。当模型中包括壁厚和OPTR的各个组成部分对环境的自然对流损耗的影响时，模型预测显示出与实验结果更好的时间对比。

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