Study on heat transfer mechanism and characteristics of jet precooling flow

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-10-13 DOI:10.1016/j.ijthermalsci.2025.110384

Jianyong Zhu , Yuchen Feng , Taiqiu Liu , Xin You

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引用次数: 0

Abstract

Jet precooling technology is a technical approach to improve the upper limit of turbine engine operation by injecting cooling medium into the intake duct and utilizing the phase change heat transfer of the cooling medium. This study investigated the heat transfer characteristics of jet precooling flow using the DPM model from the perspective of CFD simulation calculation, revealing the heat transfer mechanism of droplets during the cooling process, and analyzing the effects of different droplet incidence velocities, droplet temperatures, and droplet diameters on the cooling effect. The results indicate that jet precooling is a short transition process from unsteady to steady evaporation. The process of liquid droplets in the intake duct is extremely fast, and the greater the velocity difference between the droplet and the incoming flow, the better the cooling effect. The limited temperature variation of liquid droplets has a small impact on the cooling effect. If water is used as the cooling medium to change the parameters of liquid droplets, the boiling phase transition of water will not be achieved. Water droplets rely entirely on evaporative mass transfer and heat exchange. For the range of droplet diameters that can completely evaporate, although the cooling effect is equivalent, the smaller the diameter, the more likely it is to cause uneven temperature distribution in the inlet duct. For the range of droplet diameters that cannot completely evaporate, the smaller the droplet diameter, the better the cooling effect.

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射流预冷流传热机理及特性研究

喷射预冷技术是将冷却介质注入进气管道中，利用冷却介质的相变传热来提高涡轮发动机工作上限的技术途径。本研究从CFD模拟计算的角度，利用DPM模型研究了射流预冷流动的换热特性，揭示了冷却过程中液滴的换热机理，并分析了不同液滴入射速度、液滴温度、液滴直径对冷却效果的影响。结果表明，射流预冷是一个从非定常蒸发到定常蒸发的短暂过渡过程。液滴在进气管道内的过程极为迅速，液滴与来流的速度差越大，冷却效果越好。液滴的有限温度变化对冷却效果影响较小。如果用水作为冷却介质来改变液滴的参数，就不能实现水的沸腾相变。水滴完全依靠蒸发传质和热交换。对于能够完全蒸发的液滴直径范围，虽然冷却效果是等效的，但直径越小，越容易造成进气道内温度分布不均匀。在不能完全蒸发的液滴直径范围内，液滴直径越小，冷却效果越好。

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 Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.