Influence of jet parameters on cooling performance of liquid film formed by impingement

IF 6.9 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-10-03 DOI:10.1016/j.applthermaleng.2025.128498

Haosen Zhang, Jianwei Zhang, Ruizhi Li

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Abstract

Liquid film cooling is a crucial thermal protection method for space attitude and orbit control engines. After impinging on the wall surface, coolant jets spread outward, forming a liquid film. When the film contacts the high-temperature wall, it may undergo boiling. Most related studies focus on transient quenching conditions, examining variation in film size, wetting front, and other parameters. However, the steady-state operational characteristics of liquid film cooling remain unclear. This study employs Eulerian and Rensselaer Polytechnic Institute (RPI) models for parametric simulations to investigate the effect of jet parameters on film flow, heat transfer and wall thermal response. The mechanisms underlying these effects are analyzed. Cooling efficiency is evaluated using specific heat absorption and sensible heat utilization as key metrics. A relative range analysis is conducted to assess the impact intensity of various jet parameters on cooling performance. Results indicate that jet parameters significantly affect liquid film cooling performance, influencing the flow and heat transfer of the liquid film through the Pe number, under the control of boundary layer. To enhance cooling effectiveness, adjustments should primarily focus on subcooling and jet diameter. Conversely, optimizing film utilization requires modifications to the jet angle.

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射流参数对撞击形成液膜冷却性能的影响

液膜冷却是空间姿态和轨道控制发动机的一种重要的热保护方法。在撞击壁面后，冷却剂喷流向外扩散，形成一层液体膜。当膜接触高温壁时，它可能发生沸腾。大多数相关研究集中在瞬态淬火条件下，考察薄膜尺寸、润湿锋和其他参数的变化。然而，液膜冷却的稳态工作特性仍不清楚。本文采用欧拉模型和伦斯勒理工学院（Rensselaer Polytechnic Institute， RPI）模型进行参数化模拟，研究射流参数对膜流、传热和壁面热响应的影响。分析了这些效应背后的机制。以比热吸收和显热利用为关键指标，对制冷效率进行了评价。对不同射流参数对冷却性能的影响强度进行了相对范围分析。结果表明，射流参数对液膜冷却性能有显著影响，在边界层控制下，射流参数通过Pe数影响液膜的流动和换热。为了提高冷却效果，调整应主要集中在过冷和射流直径上。相反，优化薄膜利用率需要改变喷射角度。

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

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.