收稿日期: 2004-06-08
修回日期: 2004-08-16
网络出版日期: 2005-07-15
基金资助
国家自然科学基金项目 (50206025)资助
Comparison of Oscillating Flow Characteristics of a Metallic and a Nonmetallic Regenerator at High Frequency
Received date: 2004-06-08
Revised date: 2004-08-16
Online published: 2005-07-15
研究了2种不同填料蓄冷器的内部交变流动阻力特性.建立了在高频条件下测量蓄冷器两端交变流动参数的实验装置,用热线风速仪测量动态流速,由精密压力传感器测量瞬态压力.实验中测量了2台几何尺寸完全相同的蓄冷器,分别填充不锈钢丝网和尼龙丝网.对比实验结果发现,在高频交变流动条件下,不锈钢蓄冷器的周期平均压力降是相同雷诺数下稳定流动压力降的1.2～2倍.这一结果与其他相关文献的结论基本吻合.对于非金属蓄冷器,发现它的平均压降要大于金属蓄冷器的平均压降,是相同条件下稳定流动的3～5倍.这一结果对于高频无磁脉冲管制冷机的设计和机理理解是有意义的.
王希龙 , 党海政 , 蔡京辉 , 梁惊涛 , 周远 . 金属与非金属蓄冷器交变流动阻力特性对比实验[J]. 中国科学院大学学报, 2005 , 22(4) : 506 -510 . DOI: 10.7523/j.issn.2095-6134.2005.4.017
A dynamic experimental apparatus is designed to investigate oscillat ing flow characteristics of the regenerators under high frequency conditions. Oscillating flow characterist ics of two regenerators, are studied carefully under constant temperature conditions in the paper. They are identical in the geometrical dimension,packed with the stainless steel wire screens and the Nylon screens, respect ively. The results show that the cycleaveraged pressure drop in an oscillat ing flow for a stainless steel regenerator is 112～2 times higher than that in a steady flow, which is close to the experimental results in previous work. While the oscillat ing flow cycle-averaged pressure drop for a Nylon wire screen regenerator is larger than that for a stainless steel regenerator, which is 3 to 5 times higher than that in a steady flow. The results are useful for predicting the pressure drop characteristics of anonmetallic regenerator subjected to a periodically reversing flow with a high operating frequency.
Key words： metal; non-metal; regenerator; oscillating flow; flow characteristics; comparison
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