Numerical simulation of three dimension viscous flow of combustion-heater used for scramjet test
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摘要: 超燃冲压发动机试验时,使用燃烧型加热器模拟高焓、高马赫数的来流条件,而加热器的喷注结构对改善加热器出口流场均匀性具有重要作用.使用三维数值模拟软件Fluent对2种喷注结构的燃烧型加热器进行了三维定常反应流场模拟,获得了设计工况下的流场.结果表明,采用多孔斜喷结构能使氢气在横向有较大的穿透深度,加上空气的引射作用在燃烧室头部产生大尺度横向涡,增强了氢气和空气的混合燃烧以及燃气的掺混,使加热器出口温度场不均匀性从53%降为21%,氧气摩尔分数不均匀性从63%降为17%,更有利于开展超燃冲压发动机试验.Abstract: The combustion-heater was used to get high enthalpy, high mach number flow field in scramjet test. The injection is very important for the uniformity of the out-flow field. A three dimension numerical simulation software named Fluent was used to calculate the two injection. By examining the injection boundary, stream wise vortex etc., the mixing and combustion efficiencies of two injections were compared, and the results show that the performance of the hydrogen multi-hole oblique injection is predominated over that of the hydrogen single-hole vertical injection.
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Key words:
- scramjet /
- flow measurement /
- numerical simulation
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