Experimental study on regenerative effectiveness and flow characteristics of parallel-plate regenerator in Stirling engine

被引：5

作者：

Liu, Meng ^{[1
]}

Zhang, Bilin ^{[1
]}

Han, Dongtai ^{[1
]}

Du, Xueping ^{[1
]}

Wang, Huanguang ^{[1
]}

机构：

[1] China Univ Min & Technol, Sch Low carbon Energy & Power Engn, Xuzhou 221116, Peoples R China

来源：

APPLIED THERMAL ENGINEERING | 2022年 / 217卷

基金：

中国国家自然科学基金;

关键词：

Stirling engine; Parallel-plate regenerator; Regenerative effectiveness; Pressure drop; Axial heat conduction loss; MODERATE TEMPERATURE HEAT; PERFORMANCE; OPTIMIZATION; MICRO; MODEL;

D O I：

10.1016/j.applthermaleng.2022.119139

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Regenerator is the critical component of the Stirling engine. Its performance directly affects the efficiency of the whole engine. The heat transfer and flow characteristics of the parallel-plate regenerator (PPR) are experi-mentally investigated, and the influences of material and geometric parameters on regenerative effectiveness and pressure drop are obtained. The results show that the axial heat conduction will reduce the regenerative effectiveness of the PPR. The higher the thermal conductivity of the plate, the lower the regenerative effec-tiveness. Larger plate thickness and smaller plate length will also increase the axial heat conduction loss. The PPR shows good flow characteristics. The comparative experiment with the wire mesh regenerator shows that its friction coefficient is much lower than that of the wire mesh regenerator. Through the comprehensive index NPH/NTU defined as the ratio of number of pressure heads (NPH) to number of transfer units (NTU), the overall performances of PPR and wire mesh regenerator are compared. The results show that the PPR has better working performance. To reduce the adverse effect of axial heat conduction on the PPR, the optimization experiment was carried out by segmenting the regenerator into several sections. The results show that the regenerative effec-tiveness of the segmented PPR is increased by 20%, while the increase of pressure drop is within an acceptable range.

引用

页数：14