两级旋流数对中心分级贫油直喷燃烧室流动特性的影响  

Effect of swirl numbers on flow characteristics of a concentric staged lean direct injection combustor

作　　者：周韬 李锋[1] 赵凯[2] 王可夫 王多 ZHOU Tao;LI Feng;ZHAO Kai;WANG Kefu;WANG Duo(School of Energy and Power Engineering,Beihang University,Beijing 100191,China;Aviation University of Air Force,Changchun 130022,China)

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100191 [2]空军航空大学,长春130022

出　　处：《航空动力学报》2022年第11期2488-2500,共13页Journal of Aerospace Power

基　　金：国家科技重大专项(MJ2017D30,2017-Ⅲ-0002-0026,2017-Ⅲ-0006-0031)。

摘　　要：在一种中心分级贫油直喷燃烧室中,对主燃级和预燃级旋流数影响流动特性的规律进行了数值模拟研究。采用了不同参考截面上的旋流数来衡量两级旋流强度。结果表明,预燃级出口旋流数S增大导致主回流区最大宽度和最大回流率的增大。使主回流区回流强度显著增强的S阈值在0.6~0.64之间。主燃级旋流在主回流区涡心上游带动主回流区径向扩张,但主燃级旋流在下游会抑制主回流区,导致回流率的降低。燃级气流通道出口旋流数S从0.46增大到0.60时流动特性变化较为明显。相对旋流叶片出口截面的旋流数来说,S和S可以较好地衡量两级旋流强度等级。A numerical investigation was conducted to study the effect of swirl numbers of the main stage and the pilot stage on the flow characteristics of a concentric staged lean direct injection(LDI)combustor. The swirl numbers at different reference cross-sections were used to measure the swirling intensity of the two stages respectively. The results showed that the width and reverse flow rate of the central recirculation zone(CRZ) increased with the increment of S(the pilot stage outlet swirl number).The Sconstituting a threshold for significantly enhancing the reverse flow intensity of the CRZ was between 0.60 and 0.64. Upstream the CRZ vortex center, the main stage swirling flow brought about the radial expansion of the CRZ, but downstream it suppressed the CRZ and reduced the reverse flow rate. The flow characteristics changed significantly when S(the main stage swirl number at the flow passage outlet)increased from 0.46 to 0.60. Sand Sprovided a better measure of the swirling intensity levels of the two stages respectively, relative to the swirl numbers defined at the outlet of the swirler vanes.

关 键 词：旋流数 中心分级 主燃级 预燃级 流动特性 主回流区 

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]