CAJ | 학술논문

采用Eulerian-Lagrangian方法对不同空气旋流强度下柱状燃烧室内的旋流喷雾过程进行了数值模拟.空气旋转射流将诱使燃烧室内产生中心回流区和角回流区,随着旋流数S的增大,中心回流区呈轴向缩短、径向膨胀的趋势,而角回流区则逐渐减小.喷雾射流与中心回流边界层内,存在强烈的动量交换,随着轴向距离的增加,两相平均速度由多峰分布逐渐转变为单峰分布;随着旋流数S的增大,中心回流对喷雾射流的压迫作用有所减弱.旋流数S过小将造成小颗粒碰壁、燃料高浓度区集中于燃烧室前部,旋流数S过大则导致大颗粒穿透混合边界层、燃料高浓度区严重后移,都可能恶化燃烧效果.对于气泡雾化喷嘴,选取S=1.41的旋流配风装置可以取得良好的空气/液雾混合效果.
채용Eulerian-Lagrangian방법대불동공기선류강도하주상연소실내적선류분무과정진행료수치모의.공기선전사류장유사연소실내산생중심회류구화각회류구,수착선류수S적증대,중심회류구정축향축단、경향팽창적추세,이각회류구칙축점감소.분무사류여중심회류변계층내,존재강렬적동량교환,수착축향거리적증가,량상평균속도유다봉분포축점전변위단봉분포;수착선류수S적증대,중심회류대분무사류적압박작용유소감약.선류수S과소장조성소과립팽벽、연료고농도구집중우연소실전부,선류수S과대칙도치대과립천투혼합변계층、연료고농도구엄중후이,도가능악화연소효과.대우기포무화분취,선취S=1.41적선류배풍장치가이취득량호적공기/액무혼합효과.
Eulerian-Lagrangian method was adopted to simulate the swirl spray flow in a cylindrical furnace at different air swirl intensities.Swirl air flow induced a central recirculation zone and a corner recirculation zone in the combustion chamber.With the enhancing of air swirl number S,the central recirculation zone shortened in axial direction and expanded in radial direction,and the corner recirculation zone reduced little by little.In the boundary layer of spray and recirculation,the momentum transfer was st...