微空间下氢氧催化燃烧特性的数值分析  

Numerical simulation of characters of catalyzed combustion of hydrogen-oxygen mixture in micro-scaled chambers

作　　者：廖照邦[1] 陈青松[1] 李彩霞[1] 

机构地区：[1]重庆大学机械工程学院,重庆400030

出　　处：《机械》2008年第11期14-16,19,共4页Machinery

摘　　要：以CHEMKIN-IV中高速柱塞流反应器(PFR)作为燃烧室模型进行仿真分析。基于氢氧十九步基元反应化学动力学机理,分析了反应压力、当量比、进气流速对微空间下氢氧燃烧的影响。获得了燃烧室轴向温度场随当量比系数的变化规律,发现其最高温度出现在当量比约为1时,分析了较高的反应压力有利于提高微燃烧器氢氧燃烧效率,但过高的反应压力将导致微小空间燃烧着火滞后时间增加,使Damk?hler数降低。这些特性分析为Power MEMS的设计提供科学依据。The Plug flow reactor （PFR） model in CHEMKIN-IV is used as combustion chamber for numerical simulation. Combined with the gas phase reaction mechanism for the combustion of hydrogen-oxygen mixture which consists of 19 reversible elementary reactions, the influences which are caused by pressure, equivalence ration, flow velocity are analyzed. The law that the temperature field varying with equivalence ratio is obtained and the conclusion that the highest temperature occurs when the equivalence ration reach to one. Appropriate reaction pressure is obviously beneficial to obtain higher combustion efficiency and minimize thermal quenching effect due to heat loss through the chamber walls. However, the excessively higher reaction pressure will visibly increase the ignition lag time of the micro combustion due to goveming operation of the chain-cessation elementary reaction on high pressure, and result in the DamkOhler number smaller than unity. These analysis provide the scientific basis for the Power MEMS design.

关 键 词：氢氧燃烧 催化 微型燃烧室 数值模拟 

分 类 号：TP391.72[自动化与计算机技术—计算机应用技术]