反应压力对微小空间氢氧燃烧过程影响的数值分析  

Numerical simulation of the impact of high pressure condition on the combustion of hydrogen-air mixture in micro-scaled chambers

作　　者：陈卫军[1] 张力[1] 邓达强[2] 徐宗俊[2] 

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044 [2]重庆大学机械工程学院,重庆400044

出　　处：《现代制造工程》2008年第8期20-23,共4页Modern Manufacturing Engineering

基　　金：国家自然科学基金资助项目(50575231);中国博士后科学基金资助项目(20060400713)

摘　　要：基于氢氧19步基元反应化学动力学机理,对微燃烧器氢氧燃烧过程进行数值分析。研究表明:受反应机理控制,反应压力对微小空间燃烧过程的影响呈现复杂的非线性特性;较高的反应压力有利于提高微燃烧器氢氧燃烧效率,减少表面传热损失对微小空间燃烧稳定性和充分性的不利影响;但高压下链终止基元反应的主导作用导致微小空间燃烧着火滞后时间增加,使Damkhler数降低,从而不可能无限制地提高反应压力来强化微燃烧器的燃烧负荷率。Combined with the gas phase reaction mechanism for the combustion of hydrogen-air mixture which consists of 19 reversible elementary reactions, the combustion of hydrogen-air mixture in micro cylindrical chambers was numerically simulated. It has been discovered that the impact of reaction pressure on the micro combustion is somehow nonlinearly complicated;appropriate higher 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 governing operation of the chain-cessation elementary reaction on high pressure, and result in the DamkOhler number smaller than unity, therefore it is restricted to intensify the power density of the micro combustor by unre- strainedly increasing the reaction pressure.

关 键 词：微燃烧室 氢氧燃烧 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]