气液针栓喷注单元雾化角模型

为了准确预测气液针栓喷注单元的雾化角,基于动量守恒建立了液束撞击气膜的雾化角理论模型,通过试验结果获得变形因子,并分析了结构参数和工况参数对雾化角的影响规律。结果表明:局部动量比对雾化角影响最大,其他结构参数和工况参数都是通过影响局部动量比而进一步决定雾化角;随着局部动量比增大,液束变形程度减小,液束变形导致有效撞击动量比小于几何动量比。根据试验结果分段给出了变形因子,当局部动量比范围为0～3时,变形因子推荐值为0.61,当局部动量比范围为3～4.5时,变形因子推荐值为0.70,当局部动量比范围为4.5～7.2时,变形因子推荐值为0.75,引入变形因子的理论预测值与试验结果吻合很好,该模型可为气液针栓喷注器的理论研究和工程设计提供参考。 

Spray angle model of gas-liquid pintle injector unit

In order to accurately predict the spray angle of pintle injector unit, the theoretical model of spray angle of liquid jet impinging on gas sheet was established based on momentum conservation. The deformation factor was obtained by experimental results. Moreover, the influence of structure parameters and operation parameters on spray angle was analyzed. The results showed that the local momentum ratio had the greatest influence on the spray angle, and other structure parameters and operation parameters further determined the spray angle by influencing the local momentum ratio. As the local momentum ratio increased, the deformation of the liquid jet decreased. The effective momentum ratio was less than the geometric momentum ratio due to liquid jet deformation. According to the experimental results, the value of the deformation factor was given in sections. When the local momentum ratio ranged from 0 to 3, the recommended value of the deformation factor was 0.61. When the local momentum ratio ranged from 3 to 4.5, the recommended value of the deformation factor was 0.70.When the local momentum ratio ranged from 4.5 to 7.2, the recommended value of the deformation factor was 0.75. The theoretical predicted value of the deformation factor was in good agreement with the experimental results. This model can provide a reference for the theoretical research and engineering design of gas-liquid pintle injector.