关键词: 涡流式喷嘴;燃料雾化;燃料喷射;粘性;理论;试验

Abstract: The effects of liquid viscosity on liquid distribution in downstream of a pressure-swirl atomizer and its spray cone angle and atomization characteristics are studied theoretically and experimentally .A physical-mathematic model of liquid distribution downstream from the atomizer as well as spray cone angle is established, in which the effect of the air core in atomizer is considered for the first time. The concentration distribution, spray cone angle and Sauter mean diameter (SMD) calculation methods are also given and discussed in detail. Meanwhile, an expression for the pressure-swirl atomizer spray cone angle is suggested based on the experimental results.With the optical diagnostic technique, the atomization characteristics of the atomizer in stagnant air is studied experimentally. Empirical correlations of spray cone angle and SMD are proposed. The mathematic model is verified experimentally.This work will be considered essential to determine fuel concentration at a certain cross section of the combustion chamber downstream from the atomizer ring in a ramjet.

Key words: Wortex injector;Fuel pulverization;Fuel spray;Viscosity;Theory;Test