壁面组合孔喷注增强混合研究

Study on a new injection technology for enhancing mixture by orifice set in wall

为增强超声速气流中壁面喷注的燃料射流与气流混合,提出了一种壁面组合孔喷注方式。通过对单孔及组合孔喷注方式燃料射流流场仿真结果的对比分析发现,采用壁面喷注孔喷注燃料时,燃料射流与来流的混合过程在射流近场穿透深度起主导作用,而在射流远场涡则起主导作用。计算结果表明,采用壁面组合孔喷注氢气时,燃料射流增强了流场展向涡量,从而在射流远场获得了更好的射流与来流混合。

A new injection technology of special orifice set in wall is proposed to enhance the mixture of injection fuel jet flow and supersonic air flow. It is found by flow field simulation comparison of fuel jet flow between single orifice injection and orifice set injection that, when the wall injection orifice is used to inject the fuel in the mixing process of fuel jet flow and air flow, the penetration depth plays leading roles in near field of jet flow and the vortex plays the leading roles in far field of jet flow. The CFD results indicate that the hydrogen jet injected by the orifice set enhances the spanwise vortex of flow field, which will obtain better mixture of jet flow and air flow in far field of jet flow.