Study on flow and heat transfer characteristics of cross-jet impingement cooling

IF 5.8 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Heat and Mass Transfer Pub Date : 2025-09-05 DOI:10.1016/j.ijheatmasstransfer.2025.127772

Sheng-ju Wang , Qing-guo Lin , Ting Li , Ming-yang Tan , Zhe-hang Shi , Hai-feng Liu , Wei-feng Li

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引用次数: 0

Abstract

Parallel-jet impingement cooling is critical for thermal protection in liquid rocket engines due to its high heat flux and uniformity. However, the impact of practical jet misalignment (e.g., from hydraulic flip or installation deviations) on film cooling remains insufficiently understood. This study addresses this research gap by quantifying the effects of jet Reynolds number (Re), spacing (L_N), and cross angle (Φ) on film flow and heat transfer for cross-jet impingement. Key findings reveal that while increasing jet spacing or reducing cross angle expands the film wetted area, the configuration with large cross angle (Φ=60°) disrupts the expected wetted area growth with Re due to fountain sheet dynamics, complicating the achievement of precise control. Crucially, compared to parallel-jet impingement cooling (Φ=0°), cross-jet impingement with Φ=60° significantly enhances the local maximum heat flux and Nusselt number at specific points but markedly reduces overall cooling uniformity. Quantitatively, at identical jet spacing, the maximum heat flux of cross-jet impingement exceeds that of parallel-jet by 2.78 % on average, while the cooling uniformity index is reduced by 13.56 % on average. Through scaling analysis, novel semi-empirical correlations are established to predict the maximum surface heat flux and Nusselt number along the stagnation line, explaining their deviation from local velocity trends under different boiling modes. These findings provide valuable data and a significant reference for optimizing liquid film cooling systems and mitigating catastrophic failures in thermally critical applications.

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交叉射流冲击冷却流动与传热特性研究

平行射流冲击冷却由于其高热流密度和均匀性，对液体火箭发动机的热防护至关重要。然而，实际的射流错位（例如，液压翻转或安装偏差）对膜冷却的影响仍然没有得到充分的了解。本研究通过量化射流雷诺数（Re）、间距（LN）和横角（Φ）对交叉射流撞击时膜流动和传热的影响，解决了这一研究空白。主要研究结果表明，虽然增加射流间距或减小交叉角会扩大膜的润湿面积，但大交叉角（Φ=60°）的配置会由于喷泉板动力学而破坏Re的预期润湿面积增长，从而使精确控制的实现复杂化。关键是，与平行射流冲击冷却（Φ=0°）相比，Φ=60°的交叉射流冲击显著提高了局部最大热流密度和特定点的努塞尔数，但显著降低了整体冷却均匀性。定量地说，在相同射流间距下，交叉射流冲击的最大热流平均超过平行射流的最大热流平均2.78%，冷却均匀性指数平均降低13.56%。通过标度分析，建立了新的半经验相关关系来预测最大表面热通量和努塞尔数沿停滞线，解释了它们在不同沸腾模式下与局部速度趋势的偏差。这些发现为优化液膜冷却系统和减轻热临界应用中的灾难性故障提供了有价值的数据和重要的参考。

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