Numerical study on effect of air throttling on combustion mode formation and transition in a dual-mode scramjet combustor
Numerical study on effect of air throttling on combustion mode formation and transition in a dual-mode scramjet combustor
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空气节流对双模态超燃冲压发动机燃烧室燃烧模态形成及转变影响的数值研究
DOI：
10.1016/j.ast.2016.02.027
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发表时间：
2016-05
影响因子：
5.6
通讯作者：
Jialing Le
中科院分区：
文献类型：
--
作者：
Ye Tian;Shunhua Yang;Jialing Le
在双模态超燃冲压发动机燃烧室中，空气节流对燃烧模式的形成和转变有重要影响。本文采用非定常CFD方法研究了这种影响。数值模拟分别在来流马赫数为2.0、静温为656.5K、静压为0.125MPa的条件下进行。空气节流的位置在燃烧室入口下游575 mm处。研究结果表明，通过向燃烧室中注入节流空气，燃烧模式可以从超声速燃烧转变为亚声速燃烧。在无空气节流的情况下，燃烧火焰在燃烧室下壁附近熄灭，对应于超声速燃烧模式。在空气节流作用下，火焰稳定在燃烧室下壁附近，对应于亚音速燃烧模式。模态转换主要受两个参数的影响：节流空气的质量流量和节流时间。较大的空气节流流量可以产生较高的壁面压力，从而有利于燃烧模式的转换。当空气节流时间较短时，燃烧放热不足。
Air throttling has a great effect on combustion mode formation and transition in a dual-mode scramjet combustor. An unsteady CFD method was used to investigate this effect in the present paper. The simulation was carried out under the inflow conditions of Mach number of 2.0, static temperature of 656.5 K and static pressure of 0.125 MPa respectively. The location of air throttling was 575 mm downstream the combustor entrance. Our results indicated that the combustion mode could change from supersonic combustion to subsonic combustion with throttling air injected into the combustor. Without air throttling, the combustion flame was extinguished near the down wall of the combustor, which was corresponding to the supersonic combustion mode. With air throttling, the flame was stabilized near the down wall of the combustor, which was corresponding to the subsonic combustion mode. The mode transition was mainly effected by two parameters: the mass flux of throttling air and the throttling off time. A higher wall pressure was generated by a larger mass flux of air throttling, then the combustion mode transition was easy to be achieved. The combustion heat release was insufficient when the air throttling off time was shorter than usual.
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影响因子：
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作者：
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DOI：
10.1177/0954410012464455
发表时间：
2013-12
期刊：
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
影响因子：
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作者：
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通讯作者：
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