无焰燃烧的关键在于高温烟气与新鲜空气燃料的充分掺混。本文设计了一种基于凹腔驻涡的无焰燃烧室，并对其进行了零维和三维数值计算。零维数值计算运用简单的化学反应网络模型预测了燃烧室NOx排放，凹腔当量比为0．5时，NOx排放低于5mg／m3（@15％O2）。凹腔产生的高温烟气，可以使燃烧室后部温度分布均匀，消除了温度峰值，燃烧室实现了无焰燃烧。双凹腔结构有利于改善燃烧室出口温度分布。
Flameless combustion can be obtained by mixing a large amount of high-temperature burnt gas with fresh air and fuel. This paper designed a flameless model combustor based on trapped-vortex, and zero-dimensional and three-dimensional numerical simulation of the model was taken. Chemical Reactor Network（CNR） method was used in zero-dimension calculation to predict NOx emission of the combustor. When cavity equivalence ratio is 0.5, NOx emission is lower than 5 rag/m3（@15% 02）. The temperature distribution becomes uniformity because of the high-temperature burnt gas, and temperature peak was eliminated, so the combustor had possibility to reach flameless combustion. The temperature profile of the outlet is perfect with doublecavity.
参考文献
| [1] | 杨小龙,崔玉峰,徐纲,黄伟光.燃气轮机燃烧室化学反应器网络模型研究[J].工程热物理学报,2009(09):1585-1588. |
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