Thermal and drag reduction performance evaluation of a cavity-based scramjet combustor cooled by distributed hydrocarbon film

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS Applied Thermal Engineering Pub Date : 2024-11-19 DOI:10.1016/j.applthermaleng.2024.124981
Guilin Wang , Qunli Cheng , Shuyuan Liu , Fengjiao Li , Hongmei Liu
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Abstract

Highly robust and efficient cooling methods are crucial to the thermal protection of cavity-based scramjet combustor. In this work, a novel distributed gas film cooling method using the reacting coolant, n-Decane is proposed for a cavity-based scramjet combustor. The effect of reacting film coolant distribution on thermal and drag reduction performance is comprehensively analyzed to provide deep insights into the intrinsic coupling relationship between chemical reactions, flow structure and boundary layer heat transfer processes. The findings indicate that compared with the non-reacting gas film, the reacting gas film using n-Decane renders much lower wall temperature as well as lower wall shear stress. The cooling efficiency increases by as much as 43% at the exit of the scramjet combustor for the reacting gas film. In order to evaluate the effectiveness of the distributed gas film cooling method, the cooling and drag reduction performances of the distributed gas film cooling cases are compared with the single-stage gas film cooling case. With a fixed mass flow rate of the gaseous coolant, the conventional single gas film stream is split up into two streams of gaseous film injected from two independent injectors located in the cavity and the main combustor, respectively. It is found that that the cooling performance and the drag reduction performance are both improved when the distributed film cooling method is used. For the optimized distributed gas film cooling case, the weighted cooling efficiency increases by 5.66% while the wall shear stress decreases by 10.87% when compared with the single-stage gas film cooling case although the same total amount of coolant is used. This work indicate that the distributed film cooling is feasible in realizing collaborative optimization of cooling and drag reduction for the scramjet combustor via flow field re-organization and coolant re-distribution.
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用分布式碳氢化合物膜冷却的空腔式扰流喷气燃烧器的热性能和阻力降低性能评估
高强度和高效率的冷却方法对于空腔式扰流喷气燃烧器的热保护至关重要。在这项工作中,针对空腔式扰流喷气燃烧器提出了一种使用正癸烷反应冷却剂的新型分布式气膜冷却方法。通过全面分析反应膜冷却剂分布对热性能和阻力降低性能的影响,深入探讨了化学反应、流动结构和边界层传热过程之间的内在耦合关系。研究结果表明,与非反应气膜相比,使用正癸烷的反应气膜可大大降低壁面温度和壁面剪应力。反应气膜在扰流式喷气燃烧器出口处的冷却效率提高了 43%。为了评估分布式气膜冷却方法的有效性,将分布式气膜冷却案例的冷却和阻力降低性能与单级气膜冷却案例进行了比较。在气体冷却剂质量流量固定的情况下,传统的单级气膜流被分成两股气膜流,分别从位于空腔和主燃烧器的两个独立喷射器喷射。研究发现,采用分布式气膜冷却方法后,冷却性能和阻力降低性能都得到了改善。在优化的分布式气膜冷却情况下,虽然使用的冷却剂总量相同,但与单级气膜冷却情况相比,加权冷却效率提高了 5.66%,壁面剪应力降低了 10.87%。这项工作表明,分布式气膜冷却是可行的,它可以通过流场重组和冷却剂再分布实现扰流喷气燃烧器冷却和阻力降低的协同优化。
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来源期刊
Applied Thermal Engineering
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.
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