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为了进一步研究系统非对称性对DC流现象和脉管制冷机中直流分量对制冷性能的影响,采用数值模拟方法,引入了描述系统阻力元件的非对称性的几何参数—不对称率,详细研究了系统不对称性对脉管制冷机DC流、制冷性能的影响规律,并且在分析和比较不同流向和幅值大小的条件下,详细研究了DC流的流向和幅值对脉管制冷机的关键部件脉管和回热器的壁面温度分布特性的影响规律。数值验证了将壁面温度分布作为描述脉管制冷机中DC流的流动方向和大小的判定准则的正确性,且回热器和脉管的壁面温度分布的非线性越强烈,预示着系统内DC流的流向和幅值越大,对制冷性能的影响越剧烈,并间接指出系统热力不对称性是造成DC流的主要原因,为进一步发现和抑制直流现象提供了可靠的理论依据。
In order to further study the influence of system asymmetry on the DC flow and the DC component on the refrigeration performance of a pulse tube refrigerator, a numerical simulation method is introduced to describe the asymmetry geometric parameter asymmetry of the system resistance element. The influence of system asymmetry on the flow characteristics and refrigeration performance of pulse tube refrigerator was studied. The flow direction and amplitude of DC flow were studied in detail under the conditions of different flow direction and amplitude. The Influence Laws of Wall Temperature Distribution Characteristics of Vasculature and Regenerator on Key Components. The numerical results verify the accuracy of wall temperature distribution as a criterion to describe the flow direction and magnitude of DC flow in pulse tube refrigerator. The more nonlinear the wall temperature distribution of regenerators and vessels, The greater the flow direction and the amplitude of the flow, the more severe the influence on the refrigeration performance, and indirectly indicates that the system thermodynamic asymmetry is the main cause of the DC flow, providing a reliable theoretical basis for further discovering and suppressing the DC phenomenon.