Characteristics of steady and oscillating flows through regenerator
Characteristics of steady and oscillating flows through regenerator
复制标题
通过再生器的稳定流和振荡流的特性
DOI：
10.1016/j.ijheatmasstransfer.2016.11.096
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发表时间：
2017-05
影响因子：
5.2
通讯作者：
Mingjiang Ni
中科院分区：
文献类型：
--
作者：
Gang Xiao;Hao Peng;Haoting Fan;Umair Sultan;Mingjiang Ni
回热器是斯特林发动机中的热交换器（加热器、回热器和冷却器）之一，其流动特性对发展斯特林发动机设计方法具有重要意义。以定常流为参考，对振荡流下回热器的特性进行了实验与模拟相结合的研究。研究发现，在所测的动雷诺数范围内，振荡流的摩擦系数可以与定常流的摩擦系数关联式相同（100目2.59 × 10−2-2.04 × 10− 1，200目6.60 × 10−3-5.22 × 10− 2，300目和400目时的平均值分别为2.74 × 10−3-2.16 × 10− 2和1.43 × 10−3-1.13 × 10− 2）和无因次驱替率，实验数据与模拟结果的最大偏差小于9.6%。研究还发现，随着回热器长度的增加，气体压缩对回热器内稳态和振荡流动的影响不可忽略，单位长度压降减小。气体压缩对回热器两端的速度也有影响，实验发现，当整个系统的无因次压降小于4.22 × 10− 2时，可以采用基于活塞速度的理论速度。但是，振荡流动有其自身的特点，在回热器下游存在明显的流动扰动，热线风速仪可以准确地检测到这种扰动。研究了网格尺寸、频率和平均压力对扰动的影响，并基于无量纲回热器压降建立了扰动持续时间的关联式。
Regenerator is one of heat exchangers (heater, regenerator and cooler) in a Stirling engine, whose flow characteristics are very important for developing Stirling engine design methodology. A combined experimental and simulation study is carried out to investigate characteristics of regenerator in an oscillating flow, using steady flow as reference. It is found that the oscillating flow can share the same correlation equations of steady flow for friction factor within the measured kinetic Reynolds number range (2.59 × 10−2–2.04 × 10−1for 100 mesh, 6.60 × 10−3–5.22 × 10−2for 200 mesh, 2.74 × 10−3–2.16 × 10−2for 300 mesh and 1.43 × 10−3–1.13 × 10−2for 400 mesh) and dimensionless fluid displacement, and the maximum deviation between the experimental data and simulation results is found less than 9.6%. It is also found that the effect of gas compression can’t be ignored for the steady and oscillating flows through a regenerator with the increase of mass flow, and the pressure drop per unit length decreases as the length of regenerator increases. The velocities at both ends of regenerator are also affected by the compression of gas, and it is found that theoretical velocity based on piston velocity can be used if the dimensionless pressure drop of the whole system is less than 4.22 × 10−2in this experiment. After all, it should be noted that oscillating flow has its own characteristics, and obvious flow perturbations are found at downstream of regenerator, which are exactly detected by a hot wire anemometer. The effect of mesh size, frequency and mean pressure on the perturbation is investigated, and a correlation equation for the duration of perturbation is proposed based on dimensionless pressure drop of regenerator.
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影响因子：
5.1
作者：
M. Teitel
通讯作者：
M. Teitel
影响因子：
2.6
作者：
Lei Shi;Zhibin Yu;A. Jaworski
通讯作者：
Lei Shi;Zhibin Yu;A. Jaworski
影响因子：
1.9
作者：
N. Kagawa
通讯作者：
N. Kagawa
DOI：
10.1115/1.3644004
发表时间：
1960-06
期刊：
Journal of Applied Mechanics
影响因子：
--
作者：
W. Kays;A. London;E. Eckert
通讯作者：
W. Kays;A. London;E. Eckert
DOI：
10.2172/10130410
发表时间：
1994
期刊：
--
影响因子：
--
作者：
W. Stine;R. Diver
通讯作者：
W. Stine;R. Diver