Optimization thermal performance of ship infrared suppression devices via dual-layer water mist cooling

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-07-03 DOI:10.1016/j.ijthermalsci.2025.110126

Zhuo Zeng , Nenglin Yuan , Yitao Zou , Hong Shi

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Abstract

To enhance the performance of conventional infrared suppression systems, this study proposes a dual-layer spray system that leverages staggered water mist coverage to enhance the synergy between water mist cooling and airflow entrainment, significantly improving IRS performance. Using computational fluid dynamics (CFD), key parameters including the radial distance of spray injectors from the centerline (l_n), axial spacing between layers (d_n), and horizontal angular offset (φ) were systematically optimized. The results indicate that optimizing l_n to 0.8 m significantly enhances droplet dispersion while minimizing kinetic energy loss, thereby improving exhaust cooling efficiency. When d_n is 100 mm and φ to 30°, the system achieves optimal performance, reducing the outlet temperature of the mixing diffuser by up to 82.48 K, and effectively controlling the wall-temperature rise caused by airflow compression. Furthermore, this study reveals that momentum exchange between entrained airflow and water mist may cause high-temperature fluid to impact the wall, increasing local wall-temperature. The study provides an effective strategy to balance exhaust cooling and wall-temperature control, advancing IRS technology for naval applications.

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双层水雾冷却优化舰船红外抑制装置热工性能

为了提高传统红外抑制系统的性能，本研究提出了一种双层喷雾系统，该系统利用交错水雾覆盖来增强水雾冷却和气流夹带之间的协同作用，显著提高了IRS性能。利用计算流体力学（CFD）方法，对喷嘴距中心线径向距离（ln）、层间轴向间距（dn）、水平角偏移（φ）等关键参数进行系统优化。结果表明，将ln优化至0.8 m可显著提高液滴的分散性，同时使动能损失最小化，从而提高排气冷却效率。当dn = 100 mm, φ = 30°时，系统达到最佳性能，可使混合扩散器出口温度降低82.48 K，有效控制气流压缩引起的壁面温升。此外，本研究还揭示了夹带气流与水雾之间的动量交换可能导致高温流体冲击壁面，从而提高局部壁面温度。该研究提供了平衡排气冷却和壁温控制的有效策略，推进了IRS技术在海军中的应用。

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.