Three-dimensional, numerical investigation of reactant injection variation in a H2/air rotating detonation engine
Three-dimensional, numerical investigation of reactant injection variation in a H2/air rotating detonation engine
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DOI：
10.1016/j.ijhydene.2016.01.116
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发表时间：
2016-03
影响因子：
7.2
通讯作者：
R. Driscoll;Paul Aghasi;A. S. George;E. Gutmark
中科院分区：
文献类型：
--
作者：
R. Driscoll;Paul Aghasi;A. S. George;E. Gutmark
本文研究了旋转爆震发动机内的混合性能和非反应喷射流场。反应物的初始混合是通过一个反向旋转的涡对从一个射流在一个横流的情况下发展完成的。径向喷射的空气环绕燃料射流，将氢剪切成涡流结构。三维基线几何形状在喷射区中产生差的氢气/空气混合，这是由于低燃料渗透到宽的交叉流动的空气流中以及低空气夹带到涡流结构中。喷射参数，包括反应物流速，喷射面积，和燃料喷射分布，是不同的，以评估对混合的影响。减小空气喷射面积和燃料喷射面积改善了燃料渗透到空气流中和涡流混合机制，提高了环隙内的混合水平。对于给定的空气喷射面积，存在提供最大水平的混合度的最佳数量的燃料喷射孔。优化几何形状的变化降低了涡流混合机制的有效性。与共线燃料喷射相比，交错的燃料喷射孔产生混合度的降低。
This study characterizes the mixing performance and non-reacting injection flow field within a rotating detonation engine. Initial reactant mixing is accomplished through a counter-rotating vortex pair developing from a jet-in-a-crossflow situation. Radially injected air wraps around the fuel jet, shearing the hydrogen into the vortex structure. The three-dimensional baseline geometry produces poor hydrogen/air mixing in the injection zone due to low fuel penetration into the wide, cross-flowing air stream and low air entrainment into the vortex structure. Injection parameters, including reactant flow rate, injection area, and fuel injection distribution, are varied to assess the impact on mixing. Decreasing air injection area and fuel injection area improve fuel penetration into the air stream and the vortex mixing mechanism, enhancing the level of mixedness within the annulus. For a given air injection area, an optimized number of fuel injection holes exists that provides the greatest level of mixedness. Variations from the optimized geometry reduce the effectiveness of the vortex mixing mechanism. Staggering fuel injection holes produces a decrease in mixedness when compared to collinear fuel injection.