Research on combustion characteristics of scramjet combustor with different flight dynamic pressure conditions

IF 5.4 2区工程技术 Q1 ENGINEERING, AEROSPACE

Propulsion and Power Research Pub Date : 2023-03-01 DOI:10.1016/j.jppr.2023.02.006

Junlong Zhang, Guangjun Feng, Haotian Bai, Kangshuai Lv, Wen Bao

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引用次数: 2

Abstract

Combustion characteristics in a scramjet combustor equipped with a thin strut were observed and discussed in this paper. A series of numerical simulations were carried out under different flight dynamic pressure conditions. The parameters of cold flow field and combustion field were used to analyze the combustion characteristics. Based on the basic data, the mixing efficiency, characteristics of flame establishment and propagation as well as combustion field characteristics were discussed in this paper. The influence laws of lower dynamic pressure conditions were further revealed to optimize combustor performance. Results indicated that properly reducing the flight dynamic pressure can enhance the mixing of kerosene. The diffusion of kerosene determined the distribution of combustion zone and heat release. Then, the influencing factor that affected the chemical reaction rate was revealed to shorten chemical reaction time. And the higher flight Mach number made the flame propagation velocity faster and the combustion stability stronger. The fuel mixing became the main factor and low dynamic pressure had little effect on laminar flame propagation velocity under high Mach number conditions. The investigations in this paper are helpful for understanding the combustion characteristics under low dynamic pressure conditions.

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不同飞行动压条件下超燃冲压发动机燃烧室燃烧特性研究

对装有薄支板的超燃冲压发动机燃烧室的燃烧特性进行了观察和讨论。在不同的飞行动压条件下进行了一系列数值模拟。利用冷流场和燃烧场参数对燃烧特性进行了分析。在此基础上，讨论了混合效率、火焰建立和传播特性以及燃烧场特性。进一步揭示了低动压条件对燃烧室性能的影响规律。结果表明，适当降低飞行动压可以增强煤油的混合。煤油的扩散决定了燃烧区的分布和热量的释放。进而揭示影响化学反应速率的因素，缩短化学反应时间。飞行马赫数越高，火焰传播速度越快，燃烧稳定性越强。在高马赫数条件下，燃料混合成为影响层流火焰传播速度的主要因素，低动压对层流火焰传播速度影响不大。本文的研究有助于理解低动压条件下的燃烧特性。

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

Propulsion and Power Research Multiple-

CiteScore

7.50

自引率

5.70%

发文量

期刊介绍： Propulsion and Power Research is a peer reviewed scientific journal in English established in 2012. The Journals publishes high quality original research articles and general reviews in fundamental research aspects of aeronautics/astronautics propulsion and power engineering, including, but not limited to, system, fluid mechanics, heat transfer, combustion, vibration and acoustics, solid mechanics and dynamics, control and so on. The journal serves as a platform for academic exchange by experts, scholars and researchers in these fields.