为了解内混式气水喷嘴过程参数和结构参数对雾化特性的影响，基于自行设计的喷雾特性试验平台，使用正交试验方法定量分析了供气压力、供水压力、气水汇合角度、混合腔长度、出口尺寸对雾化特性的影响，在此基础上使用多元非线性回归方法建立喷嘴雾滴索特平均直径预测模型。试验结果表明：气流量随着供气压力、气水汇合角度、出口尺寸的增大而增大，随着供水压力的增大而减小；水流量随着供水压力、出口尺寸的增大而增大，随着供气压力、汇合角度的增大而减小；混合腔长度的变化对气水流量的影响不显著；索特平均直径随着供水压力、出口尺寸的增大而增大，随着供气压力、汇合角度、混合腔长度的增大而减小，各参数对喷嘴雾滴粒径影响的重要度排序依次为出口尺寸>供气压力>供水压力>气水汇合角度>混合腔长度；建立的多元非线性预测模型的计算值与试验结果变化趋势一致，平均相对误差为8.0%，可用于预测气水喷嘴的液滴尺寸。

In order to understand the influence of process parameters and structural parameters of internal mixing gas-water nozzle on atomization characteristics, based on a self-designed experimental platform for atomization characteristics, the influence of air supply pressure, water supply pressure, gas-water convergence angle, mixing chamber length and outlet size on atomization characteristics was quantitatively analyzed by orthogonal experiment method, and then a prediction model of nozzle droplet Sauter mean diameter (SMD) was established by using multivariate nonlinear regression method. The experimental results show that the gas flow rate increases with the increase of gas supply pressure, gas-water convergence angle and outlet size, and decreases with the increase of water supply pressure. The water flow rate increases with the increase of water supply pressure and outlet size, and decreases with the increase of water supply pressure and confluence angle. The change of mixing chamber length has no significant effect on gas-water flow. SMD increases with the increase of water supply pressure and outlet size, but decreases with the increase of gas supply pressure, convergence angle and mixing cavity length. The order of the importance of each parameter on nozzle droplet size is outlet size > gas supply pressure > water supply pressure > gas-water convergence angle > mixing cavity length. The calculated values of the multivariate nonlinear prediction model are consistent with the experimental results, and the average relative error is 8.0%, which can be used to predict the droplet size of air atomization nozzle.