Study on supersonic film cooling using gaseous hydrocarbon fuel as coolant with segmented injection regulation method

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-09-06 DOI:10.1016/j.ijthermalsci.2025.110281

Jingying Zuo , Jingjia Xue , Silong Zhang , Jianfei Wei , Xin Li , Wen Bao , Naigang Cui

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Abstract

Hydrocarbon fueled supersonic film cooling is considered to be one of the most promising thermal protection methods for scramjet combustors, while regulating its flow and combustion characteristics and improving its cooling performance are of great significance for engine performance. In this paper, the effects of segmented injection regulation method on hydrocarbon fueled supersonic film cooling performance are numerically investigated. The results indicate that, with single film injection, film combustion first brings beneficial effect and then brings negative effect on the supersonic film cooling. Whereas, segmented injection reorganizes near-wall chemical reaction and flow characteristics, resulting in endothermic-exothermic- endothermic reaction characteristics near the wall, leading to the combustion high-temperature region distributed in the film potential-core flow characteristic region and suppressing the mixing process. Therefore, segmented injection regulation method can significantly shorten the negative effect region brought by the film combustion, and further improve the supersonic film cooling performance based on that with single film injection. It is worth mentioning that, the overall film cooling performance with segmented injection is not sensitive to the flow distribution ratio in the variation range from 5:5 to 7:3. Furthermore, the second film injection arranges at the separation point of the first film, where the combustion begins to have negative effect on the film cooling, can eliminate the negative effect. Within the 500 mm length range without increasing the mass flow rate of film coolant, segmented injection by dual films with flow equalization principle and evenly distributed position can increase the average supersonic film cooling effectiveness by 19 %, and decrease the average wall skin friction by 20.1 %. The forward movement of the second film layout position to the separation point can further increase the average supersonic film cooling effectiveness by 2.85 %.

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以气态烃类燃料为冷却剂的分段喷射调节超声速气膜冷却研究

烃类燃料超声速气膜冷却被认为是超燃冲压发动机燃烧室最有前途的热保护方法之一，调节其流动和燃烧特性，提高其冷却性能对发动机性能具有重要意义。本文通过数值模拟研究了分段喷射调节方式对烃类燃料超声速膜冷却性能的影响。结果表明，在单喷油条件下，膜燃烧对超声速气膜冷却先有利后不利；而分段喷射重新组织了近壁化学反应和流动特性，形成了近壁吸热-放热-吸热的反应特性，导致燃烧高温区分布在膜势-芯流特性区，抑制了混合过程。因此，分段喷射调节方法可以显著缩短气膜燃烧带来的负面影响区域，在单气膜喷射的基础上进一步提高超声速气膜冷却性能。值得一提的是，在5:5 ~ 7:3的变化范围内，分段喷射的整体气膜冷却性能对流量分配比不敏感。此外，第二膜喷射设置在第一膜的分离点处，燃烧开始对膜冷却产生负面影响，可以消除这种负面影响。在500 mm长度范围内，在不增加气膜冷却剂质量流量的情况下，采用流动均衡原理和位置均匀分布的双气膜分段喷射，可使超声速气膜冷却效率平均提高19%，壁面摩擦平均降低20.1%。第二膜布置位置向前移动至分离点，可使超声速膜的平均冷却效率进一步提高2.85%。

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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.