双级反旋贫油直喷喷嘴雾化特性实验研究  

Experimental Study on Atomization Characteristics of Dual-Stage Counter-Rotating Lean Direct Injection Nozzle

作　　者：赵若霖 孔文俊 Zhao Ruolin;Kong Wenjun(School of Astronautics,Beihang University,Beijing 102206,China;National Key Laboratory of Aerospace Liquid Propulsion,Beihang University,Beijing 102206,China)

机构地区：[1]北京航空航天大学宇航学院,北京102206 [2]北京航空航天大学航天液体动力全国重点实验室,北京102206

出　　处：《燃烧科学与技术》2025年第2期161-173,共13页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(52076007);国家科技重大专项资助项目(J2019-Ⅲ-0012-0055).

摘　　要：基于贫油直喷低排放燃烧室技术,本文设计了一种双级反旋喷嘴,为优化其雾化性能,通过激光粒度分析仪和粒子图像测速仪(PIV)探究雾化压力、旋流器结构及进气条件等参数对雾滴粒径分布和速度场的影响.结果表明,随雾化压力增加,雾化锥角先增大后趋于稳定,索特平均直径(SMD)逐渐减小;沿雾锥径向和轴向SMD逐渐增大;旋流气流能有效降低SMD,内旋流叶片角度增加和外旋流叶片角度减小均有助于降低SMD;叶片数量对粒径分布和喷雾速度场影响较小;外气量过高时,雾锥无法形成,最佳内外气量比例为3∶1;随总气量增大,SMD先减少后增大,在7.89 g/s时,SMD达到最小值.研究结果为喷嘴设计优化提供理论依据和工程指导.This study presents the design of a dual-stage counter-rotating nozzle based on lean direct injection lowemission combustor technology.To optimize its atomization performance,the effects of atomization pressure,swirler configuration,and intake conditions on droplet size distribution and velocity fields are investigated using laser diffraction particle size analysis and particle image velocimetry(PIV).The results reveal that as atomization pressure increases,the atomization cone angle initially increases before stabilizing,while the Sauter mean diameter(SMD)decreases progressively.Along the radial and axial directions of the atomization cone,the SMD increases.Swirling airflow effectively reduces the SMD,and both increasing the inner blade angle and decreasing the outer blade angle con-tribute to a reduction in SMD.The number of blades has a minimal impact on droplet size distribution and spray velocity.When the outer air flow rate is excessively high,the atomization cone fails to form,with the optimal inner-to-outer air flow rate ratio found to be 3∶1.As the total air flow rate increases,the SMD first decreases and then increases,reaching its minimum value at 7.89 g/s.These findings provide valuable theoretical and practical insights for nozzle design optimization.

关 键 词：双级反旋 贫油直喷 雾化特性 索特平均直径 实验研究 

分 类 号：V231.23[航空宇航科学与技术—航空宇航推进理论与工程]