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为了深入理解同轴气-气喷注器气流混合机理,利用粒子图像测速仪(PIV)系统对同轴直流式和同轴离心式气-气喷注器开展了流动显示实验,研究了喷注器关键设计参数对气流混合扩散过程的影响规律.实验结果表明:对于同轴直流式喷注器,氧/氢动量比决定着气流接触面上卷吸作用的大小,动量比越大,卷吸作用越强,混合效果越好;对于同轴离心式喷注器,气流的旋度控制着气流的混合过程,旋度越大,混合效果越好.可以通过减小外环喷注压降或者给中心喷孔一定的缩进距离来增大旋度,增强旋流作用,加强气流的混合.
In order to further understand the airflow mixing mechanism of co-axial gas-air injector, a flow visualization experiment was carried out on the co-axial and coaxial centrifugal gas-air injectors using particle image velocimetry (PIV) The experimental results show that for the coaxial direct injection type, the ratio of oxygen to hydrogen determines the amount of entrainment on the contact surface of the gas flow. The larger the momentum ratio, the larger the entrainment volume The stronger the effect is, the better the mixing effect.For the coaxial centrifugal injector, the curl of the air flow controls the air mixing process, the larger the curl is, the better the mixing effect can be achieved by reducing the injection pressure drop of the outer ring or Spraying the center of a certain retraction distance to increase the rotation, enhance the role of swirling, to enhance the mixing of air.