LPP低污染燃烧室冷态流场与油雾特性  

Cold Flow Field and Fuel Spray Characteristic of LPP Low Emission Combustor

作　　者：邓远灏[1,2] 朱嘉伟[1] 颜应文[1,2] 马存祥[2] 徐华胜[2] 张靖周[1] 

机构地区：[1]南京航空航天大学能源与动力学院,南京210016 [2]中国燃气涡轮研究院,成都610500

出　　处：《南京航空航天大学学报》2013年第2期162-169,共8页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：国家自然科学基金(50906040)资助项目;中央高校基本科研业务费专项资金(NZ2012107)资助项目

摘　　要：为了研究某贫油预混预蒸发(Lean premixed prevaporized,LPP)低污染燃烧室冷态流场和油雾特性,本文采用粒子图像测速仪(Particle image velocimetry,PIV)首先试验研究不同进口空气流量对燃烧室冷态流场的影响,其次分别在单开值班级喷嘴、主级喷嘴以及同开主级和值班级喷嘴时,分析了燃油流量分配和值班级喷嘴位置对燃烧室油雾特性的影响。试验结果表明:在LPP燃烧室头部流场存在中心回流区、角落回流区和唇口回流区,中心回流区宽度随着距燃烧室头部距离的增加先逐渐增加,而后逐渐减少,且进口空气流量对燃烧室回流区形状影响不大;单开值班级喷嘴时,供油量增加,燃烧室油雾特性变差;单开主级喷嘴时,主级供油量增加,燃烧室油雾特性得到改善;主级和值班级喷嘴同时打开时,随着主级供油量增加,值班级供油量减少,燃油雾化特性得到改善;值班级喷嘴位于喉道处时燃油雾化效果优于值班级喷嘴在旋流器出口处。In order to study cold flow fields and fuel spray characteristics of a lean premixed prevaporized （LPP） low emission combustor, effects of different inlet conditions on cold fields are experimentally investigated by using particle image velocimetry （PIV）, and effects of different fuel allocations and positions of pilot atomizer on fuel spray characteristics are studied when only pilot atomizer or primary atomizer is operated, or primary and pilot atomizers are operated at the same time. Experimental results show that central recirculation zone （CRZ）, corner recirculation zone and lip recirculation zone appear in the cold flow field. The width of CRZ gradually increases firstly and then decreases with the increase of axial distance from combustor inlet. Changes of the CRZ shape are weak when inlet air flow rates change. When only pilot atomizer operates, fuel spray characteristic is gradually worsened with the increase of fuel flow rate. When only primary atomizer operates, fuel spray characteristic is gradually improved with the increase of fuel flow rate. When the pilot and primary atomizers operate at the same time, spray characteristic is gradually improved with the increase of primary fuel flow rate and the derease of pilot fuel flow rate. The spray characteristics of pilot atomizer at the throat are better than that of at the swirler outlet.

关 键 词：贫油预混预蒸发 低污染燃烧室 冷态流场 油雾场 粒子图像测速仪 

分 类 号：V231.2[航空宇航科学与技术—航空宇航推进理论与工程]