单腔离心喷嘴出口空心涡直径和平均液雾锥角的半理论预测

利用流体控制体法结合质点系动量矩守恒定理，分析了液体的黏性作用对离心喷嘴空心涡尺寸的影响机制，建立了相关理论模型，并给出了喷嘴出口空心涡直径和平均液雾锥角的半理论预测公式.同时，用多组不同工况条件下的实验测量数据对该预测公式进行了验证.结果表明:提出的预测公式计算离心喷嘴出口空心涡直径和平均液雾锥角是有效的，且具有较高的计算精度；空心涡直径的预测不确定度约为±13%，平均液雾锥角的预测不确定度在－20%~6%之间. 

Semi-theoretical prediction of air core diameter and averaged spray cone angle at simplex swirl atomizer exit

Influence of the liquid viscosity on air core size in the pressure swirl atomizer was investigated.And theoretical analysis model was established in a control volume with the conservation law of angular momentum in the particles system.Eventually,the semitheoretical prediction formula was derived,and used to calculate air core size and spray cone angle.In addition,validity of the prediction formula was verified by experimental data under different operation conditions.Results show that the present prediction formula can availably and accurately calculate air core size and averaged spray cone angle,exhibiting a prediction uncertainty of ±13％ for air core diameter calculation and from-20％ to 6％ for spray cone angle determination.