小几何特性小孔径细水雾离心喷嘴的数值模拟

针对最大流量原理法在设计小几何特性小孔径细水雾离心喷嘴方面的不足,采用Fluent软件中的多相流混合模型,模拟了包含蒸气和水两相的喷嘴内部流动,得到了流量、喷雾锥角等宏观参数,并和实验测量数据以及理论计算值进行了对比,分析了不同结果产生的原因;同时,还对喷嘴内的气液两相体积分数、轴向与切向速度、压力分布等流场特性参数进行了分析,着重论述了与理论模型之间的差异以及相应的机理.数值模拟方法考虑了液体的粘性和壁面摩擦力等因素,较好地反映了喷嘴内部的流场特性,为小几何特性小孔径细水雾离心喷嘴的设计提供了借鉴.

Numerical simulation of minor geometry characteristics and small orifice water mist swirl injector

Due to the deficiency of the maximum discharge principle with regard to the design of the minor geometry characteristics and small orifice water mist swirl injector, a numerical investigation on it was performed by simulating the inner flow field of two phase flow injector using the mixture model in Fluent, from which the flow rate and spray angel α were obtained and compared with the experimental data and the theoretical calculation results. The gas-liquid phase distribution, axial velocity and tangential velocity, pressure distribution in the injector were also investigated. The discrepancy between the investigation and the traditional design theory was discussed and the mechanism was concluded. The viscosity of liquid and the friction of wall were taken into account which made the simulation can describe the inner flow field of injector accurately and the numerical simulation provides a reference for the design of minor geometry characteristics and small orifice water mist swirl injector.