基于化学反应器网络模型法的预混气组分对NO_(x)反应路径影响研究  

Effects of Premixed Gas Components on NO_(x) Pathways Based on Chemical Reactor Network Model

作　　者：曹志博 肖隐利[1] 宋文艳[1] CAO Zhi-bo;XIAOYin-li;SONG Wen-yan(School of Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China)

机构地区：[1]西北工业大学动力与能源学院,陕西西安710072

出　　处：《推进技术》2022年第3期295-305,共11页Journal of Propulsion Technology

基　　金：国家自然科学基金面上项目(51576164)。

摘　　要：为探究预混气组分对不同反应路径下NO_(x)生成影响,针对高压射流反应器,基于CFD流场特征,构建优化了单PSR (Perfectly-stirred reactor),2PSR,3PSR以及PSR+PFR (Plug flow reactor)四种CRN (Chemical reactor network)模型。在贫预混燃烧条件下,研究了纯CH_(4)及其混合气燃烧时不同反应路径下NO_(x)的生成情况,得出了燃烧室内不同反应区域每条反应路径NO_(x)的生成量。结果表明,纯CH_(4)燃烧产生的NO_(x)主要来自于热力型、快速型和N_(2)O-中间体型三条反应路径。绝热火焰温度的提高主要促进了热力型和N_(2)O-中间体型NO_(x)的生成。随着CH_(4)或CO中加入的H_(2)摩尔分数的增加,NO_(x)排放总量降低,快速型NO_(x)生成速率降低,特别是火焰刷区。另外,混合气中CO摩尔分数的增加会导致NO_(x)生成量增多。To investigate the effects of premix gas components on NO_(x)generation under different pathways,four chemical reactor network models,namely single PSR(Perfectly-stirred reactor),2PSR,3PSR and PSR+PFR,were constructed and optimized based on the characteristics of CFD flow field in high-pressure jet stirred reactor.Under the condition of lean premix combustion,the NO_(x)generation of pure CH_(4)and its mixture in different pathways were studied,and the NO_(x)generation of each pathway in different reaction areas in the combustion chamber was obtained.The results show that NO_(x)produced by pure CH_(4)combustion mainly comes from three pathways:thermal NO_(x),prompt NO_(x)and N_(2)O-intermediate NO_(x).It is found that thermal and N_(2)O-intermediate NO_(x)emission increase with the increase of adiabatic flame temperature.With the addition of H_(2)in CH_(4)or CO,the total NO_(x)emission decreases and the rate of prompt NO_(x)decreases,especially in the flame brush area.In addition,NO_(x)emission increases with the CO mole fraction increasing in the CH_(4)/CO mixture.

关 键 词：低排放燃烧室 预混气组分 反应路径 化学反应器网格模型法 绝热火焰温度 

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]