Enhancement of the film cooling performance by the combination of droplet/air coolant and upstream micro-vortex generator

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2024-10-29 DOI:10.1016/j.ijheatmasstransfer.2024.126376

Wei Tian , Kuan Zheng , Zhiyun Hu , Na Cao

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引用次数: 0

Abstract

In this study, a combination of Euler-Lagrange method is adopted to investigate the effect of upstream micro-vortex generator (VG) on the film cooling performance of two-phase droplet/air film cooling. The droplet trajectories and flow field are also simulated to reveal the flow mechanism related to the improvement effect of micro-VG on the droplet/air film cooling performance. The results indicate that the anti-counter-rotating vortex pair (anti-CRVP) induced by micro-VG can expand the spreading region of droplets in spanwise direction, and also force the droplets to approach the wall, delaying the separation of droplets from the wall under high blowing ratios. As a result, the micro VG can effectively enhance the improvement effect of droplets on film cooling effectiveness in both spanwise and streamwise directions, thereby enhancing the overall cooling performance of droplet/air film cooling. In addition, the size and flow rate of droplets are also investigated to reveal the influence of droplet parameters on the performance of droplet/air film cooling. It was found that there is an optimal droplet size for the enhancement of droplet/air film cooling efficiency.

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结合液滴/空气冷却剂和上游微涡流发生器提高薄膜冷却性能

本研究采用欧拉-拉格朗日方法研究了上游微涡流发生器（VG）对两相液滴/空气膜冷却性能的影响。同时模拟了液滴轨迹和流场，以揭示微涡流发生器对液滴/气膜冷却性能改善作用的相关流动机理。结果表明，微 VG 诱导的反逆向旋转涡对（anti-CRVP）能扩大液滴在跨度方向上的扩散区域，同时还能迫使液滴靠近壁面，在高吹风比的情况下延缓液滴与壁面的分离。因此，微 VG 可以有效增强液滴在跨向和流向两个方向上对薄膜冷却效果的改善作用，从而提高液滴/空气薄膜冷却的整体冷却性能。此外，还研究了液滴的大小和流速，以揭示液滴参数对液滴/气膜冷却性能的影响。研究发现，液滴大小是提高液滴/气膜冷却效率的最佳尺寸。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Heat and Mass Transfer 工程技术-工程：机械

CiteScore

10.30

自引率

13.50%

发文量

1319

审稿时长

41 days

期刊介绍： International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems. Topics include: -New methods of measuring and/or correlating transport-property data -Energy engineering -Environmental applications of heat and/or mass transfer