凹腔构型对超声速气-固两相富燃燃气掺混燃烧的影响  

Influence of cavity configuration on supersonic two-phasegas-solid enriched fuel combustion

作　　者：马立坤[1] 杨鹏年 夏智勋[1] 冯运超[1] 赵李北 刘延东 MA Likun;YANG Pengnian;XIA Zhixun;FENG Yunchao;ZHAO Libei;LIU Yandong(Hypersonic Technology Laboratory,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学高超声速技术实验室,长沙410073

出　　处：《固体火箭技术》2024年第5期620-628,共9页Journal of Solid Rocket Technology

基　　金：湖南省荷尖人才计划(2022RC1233);长沙市杰出青年基金项目(kq2107001);湖南省研究生科研创新项目(CX20230058)。

摘　　要：凹腔作为燃烧增强装置,在超声速气-固两相富燃燃气掺混燃烧中发挥着重要作用。基于火焰稳定凹腔和斜劈装置,提出了波瓣凹腔构型,通过数值模拟深入分析了凹腔构型在超声速气流中对气-固两相富燃燃气掺混燃烧的影响。通过对流场参数、流场云图及颗粒运动轨迹等的分析,发现富燃燃气中的气相组分和凝相颗粒在空间分布和释能过程中表现出分区运动和分区燃烧的特点。结果表明:随着燃烧过程的深入,颗粒的空间分布逐渐分散;流场参数在燃气喷口附近变化剧烈、流场下游变化缓慢;波瓣结构具备增强流场湍动能和降低流场不均匀性的能力,进而促进了各组分的掺混燃烧;采用双波瓣凹腔时展现出最优的促进效果。波瓣结构能够扩大流场中高温区域的空间分布,有效延长凝相颗粒在高温区域的停留时间,为凝相颗粒的燃烧和能量释放提供了更为有利的条件。As a combustion enhancement device,the cavity plays an important role in the supersonic gas-solid two-phase fuel-rich gas mixing combustion of the scramjet.For the flame-stabilized cavity and the slope device,the lobe cavity configuration was proposed.The influence of the cavity configuration on the mixing and combustion of gas-solid two-phase fuel-rich gas in supersonic airflow was analyzed by means of the numerical simulation.Through analyzing of parameters,contours and particle motion trajectories of the flow field,it is found that the gaseous components and solid particles in the enriched fuel exhibit characteristics of subregion motion and subregion combustion in terms of spatial distribution and exergonic process.The results show that the spatial distribution of the particles is gradually dispersed with the combustion process progresses.The flow field parameters show drastic changes near the fuel jet exit and slow changes downstream.The lobe structure has the ability to increase the turbulent energy of the flow and reduce the non-uniformity of the flow,thereby promoting the mixing combustion of various components.The double-lobe cavity showing the best promoting effect.The lobe structure effectively prolong the residence time of particles in the high-temperature region of the flow by expanding the spatial distribution of the high-temperature region,providing more favorable conditions for combustion and energy release of solid particles.

关 键 词：超声速气流 气-固两相 波瓣型凹腔 掺混燃烧 数值模拟 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]