金字塔型内表面太阳能集热管的传热性能的数值研究

林志敏; 张航敏; 王朝霞; 侯博; 王良璧

doi:doi:10.19912/j.0254-0096.tynxb.2024-1539

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金字塔型内表面太阳能集热管的传热性能的数值研究

更新时间：2026-02-06

- 金字塔型内表面太阳能集热管的传热性能的数值研究
- Vol. 47, Issue 1, Pages: 146-157(2026)
- 作者机构：
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- DOI：doi:10.19912/j.0254-0096.tynxb.2024-1539
  CLC： TK513
- Online First：05 February 2026，
  
  Published：05 February 2026
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林志敏, 张航敏, 王朝霞, et al. 金字塔型内表面太阳能集热管的传热性能的数值研究[J]. 2026, 47(1): 146-157.
DOI：

林志敏, 张航敏, 王朝霞, et al. 金字塔型内表面太阳能集热管的传热性能的数值研究[J]. 2026, 47(1): 146-157. DOI： doi:10.19912/j.0254-0096.tynxb.2024-1539.

摘要

为改善槽式太阳能集热管因非均匀受热引起的较大周向温差问题

通过冲压工艺在传统金属集热管内壁加工出金字塔型内表面集热管

并采用数值模拟方法

对比分析金字塔粗糙元不同长度比、宽度比、高度比对管内流动与传热特性、集热管周向最大温差、二次流强度以及局部传热特性的影响。研究结果表明：金字塔型粗糙元的引入提高了传统集热管的换热能力

其结构参数会不同程度地影响流动与传热特性

最大强化传热因子达1.59。与传统集热管相比

金字塔型强化管周向最大温差降幅最高可达51.68%。此外

局部努塞尔数（Nulocal）在周向上呈周期性变化规律

在金字塔粗糙元的塔尖和塔底之间出现峰值。截面平均努塞尔数（Nuz）与二次流强度（Sez）沿流动方向的变化趋势一致

同时

Num和Se随雷诺数（Re）的变化趋势也保持一致

表明金字塔型内表面管内二次流强度决定其换热强度。

Abstract

To address the issue of large circumferential temperature differences caused by non-uniform heating in parabolic parabolic trough solar collector tubes

a pyramidal inner-surface collector tube was designed by applying a stamping process to the inner wall of a traditional metal collector tube. The parametric effects of the different pyramid lengths

pyramid widths

and pyramid heights on the fluid flow and heat transfer characteristics

the circumferential maximum temperature difference

the intensity of secondary flow

and the local heat transfer characteristics in the pyramidal inner-surface collector tube were analyzed comparatively using a numerical method. The results show that： the introduction of pyramid-shaped roughness elements enhances the heat transfer performance of traditional collector tubes

with the structural parameters having varying degrees of influence on the flow and heat transfer characteristics; and the maximum evaluation factor of heat transfer enhancement named as reaches 1.59

and compared with a traditional collector tube

the maximum circumferential temperature difference with the pyramidal enhanced tube is reduced by up witha 51.68%; and the local Nusselt number on the inner wall surface changes periodically along the circumferential direction

with its peak values occurring at a specific location between the apex and the base of the pyramid elements; the variation trends of the cross-sectional average Nusselt number and secondary flow intensity along the flow direction are consistent

and the variation trend of average Nusselt number and secondary flow intensity with increasing Reynolds number are also consistent

which indicates that the intensity of secondary flow in the pyramidal inner-surface collector tube determines its heat transfer intensity.

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