CO与H_(2)氧化释热对煤油V型钝体稳焰器回流特性的影响  

Effects of CO and H_(2) Oxidation Heat Release on Reversed-Flow Characteristics of Kerosene V-Gutter Bluff Body Flameholder

作　　者：沈硕 金捷[1,2,3] 蔡江涛 宋绪光 王方 SHEN Shuo;JIN Jie;CAI Jiang-tao;SONG Xu-guang;WANG Fang(Aeroengine Simulation Research Center,School of Energy and Power Engineering,Beihang University,Beijing 100191,China;Jiangxi Research Institute,Beihang University,Nanchang 330096,China;Chengdu Innovation Research Institute on Aircraft Power,Beihang University,Chengdu 611930,China)

机构地区：[1]北京航空航天大学能源与动力工程学院航空发动机数值仿真研究中心,北京100191 [2]北京航空航天大学江西研究院,江西南昌330096 [3]北京航空航天大学成都航空动力创新研究院,四川成都611930

出　　处：《推进技术》2022年第12期252-261,共10页Journal of Propulsion Technology

基　　金：国家科技重大专项(2017-I-0004-0005;2017-I-0001-0001);国家自然科学基金(91741125)

摘　　要：针对高速、贫氧的加力燃烧室流动特性,应用大涡模拟-输运概率密度函数方法(LES-TPDF)结合三种航空煤油机理,在来流马赫数为0.1的条件下,对一种V型钝体稳焰器进行两相燃烧流场的计算。结果表明,不同化学机理模拟的回流特性差异大,剪切层湍动能强度与回流区长度不同。由释热分析发现,钝体燃烧CO或H_(2)氧化强烈,过弱的氧化使剪切层释热率低、掺混弱,因此湍动能小,CO和H_(2)在回流区积累并缓慢反应、延长回流。本文统计不同机理的反应放热量,发现Kundu机理的CO,H_(2)氧化放热之和仅占总过程的25.30%。而反应强的骨架机理与JL4机理放热占比达到50.50%与87.16%,回流吻合实验,适用于当前工况的研究。Aiming at the flow characteristics in the high-speed,low-oxygen afterburner combustion chamber,three chemical mechanisms with Large Eddy Simulation and Transport Probability Density Function(LESTPDF)method were selected to calculate the two phase combustion flow field of a V-gutter flameholder with an inflow Mach number of 0.1.Results show that reversed-flow characteristics vary between different chemical mechanisms,making turbulent kinetic energy and recirculation zone length different.The analysis of heat release characteristics reveals that CO or H_(2)are vigorously oxidized in bluff-body combustion.Too weak oxidation leads to low heat release rate at shear layer and weak mixing,hence a low turbulent kinetic energy and accumulating excess CO and Hin the recirculation zone,which reacts mildly and prolongs reversed-flow.The reaction exothermic is also analyzed in this paper and it is found that,for the Kundu mechanism,CO and H_(2)oxidation exotherm only accounts for 25.30%of the overall process.While the skeleton mechanism and JL4 mechanism,with higher oxidation exotherm,account for 50.50%and 87.16%,which match experimental flow characteristics and are suitable for the study of the current condition.

关 键 词：V型钝体稳焰器 煤油化学机理 回流流动 释热率 LES-TPDF 两相扩散火焰 

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]