Flame structure and performance evaluation of rocket-type vitiated air heater with film cooling

IF 5.8 1区工程技术 Q1 ENGINEERING, AEROSPACE

Aerospace Science and Technology Pub Date : 2025-09-23 DOI:10.1016/j.ast.2025.111001

Bu-Kyeng Sung , Jae-Eun Kim , Eun-Sung Lee , Seung-Min Jeong , Jeong-Yeol Choi

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Abstract

This study presents a novel design approach for a Vitiated Air Heater (VAH) integrated into a direct-connect scramjet combustor (DCSC) by incorporating coolant-air injection into a rocket combustor. The suitability of hydrogen as a fuel for VAH operation was evaluated through thermodynamic analysis. Using Large Eddy Simulation (LES) with the ‘reactingFoam’ solver in OpenFOAM, the flame structure within the VAH combustor was analyzed. The VAH is designed to operate at a stagnation temperature of 1578 K and a pressure of 17.3 bar, corresponding to flight conditions at Mach numbers between 4.0 and 5.0. Key design features include a gaseous hydrogen/oxygen coaxial shear injector for heat addition and 24 peripheral air injectors for air supply and film cooling. The integration of coolant injection generated a recirculation zone that enhanced turbulence and facilitated the formation of a unique dual flame structure. This configuration enabled complete combustion within the first third of the combustor, achieving a uniform temperature distribution close to the target adiabatic flame temperature. The proposed VAH design offers significant potential to provide an efficient and precise testing environment for high-speed propulsion systems.

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火箭式气膜冷却污浊空气加热器火焰结构及性能评价

本文提出了一种将冷却空气注入火箭燃烧室的方法，将真空空气加热器（VAH）集成到直连式超燃冲压发动机燃烧室（DCSC）中。通过热力学分析，评价了氢作为VAH操作燃料的适用性。利用大涡模拟（LES）和OpenFOAM中的“反应泡沫”求解器，对VAH燃烧室内的火焰结构进行了分析。VAH设计在1578 K的滞止温度和17.3 bar的压力下运行，对应于马赫数在4.0和5.0之间的飞行条件。主要设计特点包括一个用于加热的气态氢/氧同轴剪切喷射器和24个用于供气和膜冷却的外围空气喷射器。冷却剂注入的集成产生了一个再循环区，增强了湍流，促进了独特的双火焰结构的形成。这种结构使燃烧室的前三分之一完全燃烧，实现了接近目标绝热火焰温度的均匀温度分布。提议的VAH设计为高速推进系统提供了一个高效、精确的测试环境。

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

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.