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使用CFD优化一种新的梯形分层肋形配置,以提高太阳能空气加热器的性能
Sarvapriya Singh1, Siddharth Suman2, Santanu Mitra1
1Department of Mechanical Engineering, Shiv Nadar Institute of Eminence, Tehsil Dadri, Uttar Pradesh, 201314, India.
概括
新型的梯形分层肋骨增强了太阳能空气加热器的性能. 优化不连续的肋骨最大限度地提高了热液压性能,优于其他形状,特别是在较低的雷诺兹数下.
科学领域:
- 热力工程是热力工程中的一个.
- 可再生能源系统可再生能源系统
- 计算流体动力学的流体动力学.
背景情况:
- 太阳能空气加热器需要增强的热传输以提高效率.
- 人工粗是一种常见的方法,用于增加太阳能空气加热器中的热传递.
- 了解流体流动和传热行为对于优化太阳能空气加热器设计至关重要.
研究的目的:
- 为了研究太阳能空气加热器的新型横向梯形分层肋骨配置.
- 使用计算流体动力学 (CFD) 分析流体流动和传热特性.
- 为了优化肋骨参数,并将热液压性能与其他肋骨形状进行比较.
主要方法:
- 使用CFD模拟来建模流体流动和热传输.
- 对光滑管道进行了努塞尔特数的实验验证.
- 参数研究集中在不连续的肋骨宽度 (w) 和间隙宽度 (g) 上.
- 与横跨分层的圆柱形和矩形肋骨进行比较.
主要成果:
- 与连续肋骨相比,分层肋骨的排列显示出更高的性能.
- 经过优化,带有不连续肋宽50毫米和间隙宽10毫米的梯形肋骨,在Re=5000时实现了最大的热液压性能 (1.57).
- 优化的分层梯形肋骨表现优于分层圆柱形和矩形肋骨.
- 分层的矩形肋骨提供了Nusselt数的最大增加,尽管压力下降更高.
结论:
- 横向的梯形分层肋骨为提高太阳能空气加热器性能提供了显著的潜力.
- 优化不连续的肋骨几何是最大化热液压性能的关键.
- 肋骨形状的选择取决于热传递增强还是压力下降是主要关注的问题.
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