旋流杯结构对燃油雾化粒径的影响

Effects of swirl cup structure on fuel atomization particle size of fuel

为深入研究进气参数、旋流杯结构以及中心喷嘴与旋流杯文氏管的轴向配合对航空煤油雾化粒径的影响,采用LSA(laser size analyzer)-Ⅲ激光粒度分析仪在常温常压下对同向双级轴向旋流杯出口下游35mm处燃油索太尔平均直径(SMD)进行测量。结果显示:随着旋流杯头部压降的增大,燃油SMD不断减小,但减小趋势不断变缓;叶片角在35°附近时,燃油粒径较小;内外两级旋流强度需相互匹配,两者共同影响燃油预膜与破碎;文氏管喉道直径影响了内级旋流强度及成膜质量,喉道直径与文氏管长度比在1.04~1.13内,燃油SMD较小;套筒扩张段限制喷雾运动,其值过大或过小都会导致燃油SMD增大;燃油喷嘴与文氏管装配位置影响液膜破碎质量。

In order to deeply study the effects of inlet parameters,swirl cup structures and axial coordination of fuel nozzle and Venturi of swirl cup on the atomization particle size of aviation kerosene,the LSA(laser size analyzer)-Ⅲwas used to measure the Sauter mean diameter(SMD)at 35 mm downstream the outlet of the co-rotating axial swirl cup under ambient temperature and pressure.The results showed that with the increase of the total pressure loss coefficient of the swirl cup,the SMD of fuel decreased,while the decreasing trend slowed down.The SMD was small near the case of 35°vane installation angle.The inner and outer swirling intensity should be matched with each other,which together could affect the fuel pre-filming and fuel sheet breakup.The Venturi throat diameter affected the inner swirling intensity and the quality of film formation.While the ratio between the Venturi throat diameter and Venturi length was within the range of 1.04-1.13,the SMD was small.The spray diffusion was restricted by the sleeve divergence section.Either large or small divergence angle may lead to an increase in fuel SMD.The position of fuel nozzle and the Venturi affected the quality of liquid film breaking.