壁面凹腔强化H2超声速燃烧的数值模拟

Numerical study on H2 supersonic combustion in scramjet combustor with cavity

关键词:  氢  超音速燃烧  凹体  燃烧性能  数值仿真

Key words:  Hydrogen  Supersonic combustion  Concave body  Combustion performance  Numerical simulation

摘要:

为了分析凹腔火焰稳定器强化H2超声速燃烧的流动特性,运用数值模拟方法研究了凹腔对超声速燃烧室性能的作用规律。结果表明:凹腔的火焰稳定机制主要在于富含自由基的高温回流区,燃烧室结构设计采用凹腔火焰稳定器能够起到稳定燃烧和增强混合的作用;与直通道燃烧室相比,凹腔燃烧室尽管总压损失较大,但可以获得较好的混合和燃烧性能。

Abstract:

The numerical simulation was developed to investigate the reactive flow characteristics for hydrogen supersonic combustion with recessed cavity.It is noted that the hot recirculation zone full of radicals in cavity is the paramount mechanism for stable flame holding.It shows that the cavity flame-holders can provide flame stabilization and mixing enhancement in supersonic combustors and the cavity-based combustor shows better performance in mixing and combustion compared with the no-cavity case.