内壁扩张角度对冲压旋转爆轰燃烧室工作特性影响的数值研究  

Numerical study on effects of inner wall expansion angle on working characteristics of ramjet rotating detonation combustors

作　　者：许浦逢 郑权[1] 黄亚坤 冯文康 翁春生[1] XU Pufeng;ZHENG Quan;HUANG Yakun;FENG Wenkang;WENG Chunsheng(National Key Lab of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学瞬态物理重点实验室,江苏南京210094

出　　处：《推进技术》2024年第10期123-135,共13页Journal of Propulsion Technology

基　　金：国家自然科学基金(12272185,12172177,12102195)。

摘　　要：为研究内壁扩张角度对冲压旋转爆轰燃烧室工作特性的影响,构建了内壁扩张角度从0°~6°变化的5种扩张型燃烧室,基于乙烯-空气对带有凹腔结构的冲压旋转爆轰燃烧室进行三维数值模拟,分析了不同扩张角度下燃烧室的流场特征。计算结果表明:采用扩张型流道可有效减弱新鲜燃料层内的提前燃烧现象,随着扩张角度增大,爆轰波波头高度增加,爆轰波传播稳定性增强;扩张型流道对爆轰波后燃烧产物起到整体加速作用,并未起到整流作用;凹腔结构中涡核中心随着扩张角度的增大逐渐向凹腔后缘壁面移动,回流进入凹腔底部的新鲜燃料增多,凹腔对主流区新鲜燃料卷吸作用增强;采用扩张型流道后,燃烧室凹腔段总压增益和燃烧室出口总压均随扩张角度的增大而降低。In order to study the influence of the inner wall expansion angle on the operating characteristics of the ramjet rotating detonation combustors,five kinds of expansion combustors with the inner wall expansion an-gle varying from 0°to 6°were constructed,three-dimensional numerical simulation of the ramjet rotating detona-tion combustors with cavity structure was carried out based on ethylene-air,and the flow field characteristics of the combustors under different expansion angles were analyzed.The calculation results show that,the expansion flow channel can effectively reduce the pre-combustion phenomenon in the fresh fuel layer,with the increase of expansion angle,the height of detonation wave head increases,and the propagation stability of detonation wave is enhanced.The expansion flow channel plays an overall accelerating role in the combustion products after detona-tion wave,but does not play a rectification role.With the increase of the expansion angle,the center of the vortex core in the cavity structure gradually moves to the wall of the rear edge of the cavity,and the fresh fuel flowing back into the bottom of the cavity increases,the entrainment effect of the cavity on the fresh fuel in the main stream area is enhanced.With the expansion of the flow channel,the total pressure gain of the combustors cavity and the total pressure of the combustors outlet decrease as the expansion angle increases.

关 键 词：冲压旋转爆轰 内壁扩张角度 凹腔 三维数值模拟 流场分布 

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]