惯性管内部交变流动的数值计算与分析

Numerical simulation and analysis on oscillating flow in inertance tube

介绍了针对脉冲管制冷机中惯性管内部交变流动的数值计算方法。借助这个方法,计算得到了惯性管内动态压力波、质量流量、质量流量与压力波的相位差等流动参数,分析了这些参数受惯性管入口动态压力波幅值和频率的影响。计算结果验证了在惯性管中存在动态压力波幅值最小的点,进一步发现了该点的位置受入口动态压力波幅值影响较小,受频率影响较大。并且在该点前后,惯性管中质量流量与压力波的相位差沿着惯性管轴向的变化呈现出不同的趋势。

A numerical simulation method for calculating oscillating flow in inertance tube which was used as the phase shifter in pulse tube cooler was introduced. With this method,flow parameters in inertance tube such as dynamic pressure,mass flow,phase angle between pressure and mass flow were obtained. Based on these simulation results,the influences of inlet dynamic pressure＇s amplitude and frequency were analyzed. Moreover,the point with the smallest dynamic pressure amplitude in inertance tube was validated. It was found that frequency of inlet dynamic pressure had more significant influence on the position of that point than the amplitude of inlet dynamic pressure. And different change tendency of the phase angle between dynamic pressure and mass flow along axial direction of inertance tube were revealed before and after that point.