锥形空心液膜雾化特性预测模型研究

The atomization of hollow cone spray was studied by visual test method in present research. The characteristic parameters of liquid film near nozzle orifice were obtained by a high-speed camera equipped with long-distance microscopic lens, and the spray morphology and transient spray characteristics of the film were captured. Firstly, the breakup characteristics of the hollow cone spray were analyzed. Then, the deviations of common prediction models for breakup length and spray cone angle of liquid film were discussed based on the experimental data, and the error analysis were presented. Insufficient consideration on model simplification and selection of empirical constant were considered as the major reason of prediction error. Subsequently, based on the experimental data of various nozzle structures and the parameters of liquid film at outlet, the piecewise prediction models of the initial breakup length and spray cone angle of hollow cone spray was established. The new model has better universality and accuracy. The results of present research provide important reference for the analyses of spray characteristics of hollow cone spray, as well as the development of numerical approaches for the spray and mixing of hollow cone.