基于acetone-PLIF技术的超燃冲压发动机燃烧室燃料/空气掺混特性  

Fuel/air mixing characteristics of scramjet combustor based on acetone-PLIF technology

作　　者：王林森 涂晓波[2] 王宇航[1,3] 陈爽[1,2] 宋文艳[3] 杨顺华[1] WANG Linsen;TU Xiaobo;WANG Yuhang;CHEN Shuang;SONG Wenyan;YANG Shunhua(Science and Technology on Scramjet Laboratory,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China;Facility Design and Instrumentation Institute,China Aerodynamics Research and Development Center,Mianyang Sichuan 621000,China;School of Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]中国空气动力研究与发展中心高超声速冲压发动机技术重点实验室,四川绵阳621000 [2]中国空气动力研究与发展中心设备设计与测试技术研究所,四川绵阳621000 [3]西北工业大学动力与能源学院,西安710072

出　　处：《航空动力学报》2021年第8期1614-1620,共7页Journal of Aerospace Power

基　　金：高超声速冲压发动机技术重点实验室开放基金(STS/MY-KFKT-2017-003)。

摘　　要：针对超燃冲压发动机燃烧室内燃料/空气掺混特性,设计了一套以acetone-PLIF(planar laser-induced fluorescence)为技术手段的流动显示测量系统,得到了4种不同结构交错楔形支板在不同特征截面处的丙酮荧光图像,研究了喷嘴位置和尾缘角这两个变量对燃料/空气掺混效果的影响。结果表明:"基准"支板NL1的流场结构主体上表现为横向"S"形曲线,燃料/空气的掺混效果相对普通;NL2支板虽然增大了一些丙酮的扩散范围,但有荧光信号的掺混区域面积却反而有所下降;而引入扩张型尾缘角变量的EL1支板则是大幅改善了燃料/空气的掺混效果,54 mm截面的丙酮分子充满了较大片区域,掺混区域超过截面的1/2。In order to study fuel/air mixing characteristics in scramjet combustor,a non-invasive flow visualization system was designed based on acetone-PLIF(planar laser-induced fluorescence)technology. The acetone fluorescence images of four kinds of shaped struts were obtained at different sections, and the effects of nozzle position and trailing edge angle on fuel/air mixing were studied. The results showed that the flow field of the"standard"NL1 strut was of a transverse"S"curve,which had normal mixing effect in the four struts. The NL2 strut increased a few acetone diffusion range, but decreased mixing area with fluorescence signals. The EL1 strut with an expanded trailing edge angle can greatly improve effect, since the acetone molecules filled over a half of the cross section at 54 mm downstream the strut.

关 键 词：Acetone-PLIF技术 超燃冲压发动机 燃烧室 涡结构 掺混效果 

分 类 号：V237[航空宇航科学与技术—航空宇航推进理论与工程]