铁颗粒非均相着火模型与着火特性研究  

Heterogeneous Ignition Model and Ignition Characteristics of Iron Particle

作　　者：蔡平 徐义华[1] 胡坤 陈宣任 杨志豪 孙海俊[1] 任冠龙 Cai Ping;Xu Yihua;Hu Kun;Chen Xuanren;Yang Zhihao;Sun Haijun;Ren Guanlong(Jiangxi Key Laboratory of Micro Aeroengine,School of Aircraft Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学飞行器工程学院江西省微小航空发动机重点实验室,南昌330063

出　　处：《燃烧科学与技术》2024年第1期91-102,共12页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51666012,12102161);航空科学基金资助项目(20200001056001).

摘　　要：基于缩小未反应核模型,考虑氧化层对氧气的扩散影响,构建了空气中Fe颗粒的非均相着火模型.模型计算的着火温度与实验着火温度的最大误差为6.95%,与Mi等的着火模型对比,两者所计算的颗粒升温速率基本一致,着火延迟时间的数量级相同.基于该模型研究了环境压强、氧气浓度、初始氧化层厚度和颗粒粒径对着火温度、着火延迟的影响.结果表明:着火温度、着火延迟时间随环境压强、氧气浓度增大而减小,随初始氧化层厚度增厚而增大;粒径小于10μm的范围内,着火温度随粒径减小而增大,粒径在10~50μm范围内,粒径对着火温度影响不大;随着粒径增加,着火延迟时间增加.The heterogeneous ignition model of iron particles in air was established based on shrinking unreactedcore model,taking into account the influence of oxygen diffusion in the oxide layer on the ignition process.The maximum error between the calculated ignition temperature by this model and the experimental ignition temperature is 6.95%.Compared with Mi's ignition model,the particle heating rates calculated by the two models are basically the same,and their ignition delay time is of the same order of magnitude.The influences of atmospheric pressure,oxygen concentration,initial oxide-layer thickness and particle diameter on ignition temperature and ignition delay were studied based on this model.The results showed that ignition temperature and ignition delay decrease with the increase of atmospheric pressure and oxygen concentration but increase with the increase of initial oxide-layer thickness.The ignition temperature within the range of particle diameter less than 10μm increases with the decrease of particle diameter,and within the range of 10μm to 50μm,it is hardly affected by particle diameter.The ignition delay time increases as the particle diameter increases.

关 键 词：铁颗粒 燃料 非均相着火模型 着火温度 着火延迟 

分 类 号：TK16[动力工程及工程热物理—热能工程]