文献类型：期刊文献

中文题名：预混合高速射流燃烧反应器内温度场的数值模拟

英文题名：Numerical Simulation of Temperature Field in Premixed High-Speed Jet Flame Reactor

作者：蔡冬莹[1];王跃林[2];段先建[2];胡丹[3];李玉冰[1];胡彦杰[1]

机构：[1]华东理工大学材料科学与工程学院,超细材料制备与应用教育部重点实验室,上海200237;[2]广州汇富研究院有限公司,广州510665;[3]宜昌汇富硅材料有限公司,湖北宜昌443007

年份：2020

卷号：46

期号：2

起止页码：173

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD_E2019_2020】；

基金：国家自然科学基金(91534202);上海市浦江人才计划(18PJ1402100)。

语种：中文

中文关键词：气相燃烧;预混合高速射流;温度场;纳米颗粒

外文关键词：gas-phase combustion;premixed high-speed jet;temperature field;nanoparticles

摘要：采用可实现k-ε模型、涡耗散概念(EDC)模型、离散项模型,运用氢气燃烧19步详细反应机理,对预混合高速射流燃烧反应器内氢气的燃烧过程进行数值模拟。结果表明,在不同规模的燃烧反应器内,随着烧嘴中心管出口直径的增大,高温区长度明显增加,中心射流速度衰减减弱;纳米二氧化硅作为入射源时,颗粒在高温火焰区停留时间明显增加,返混现象加重。模拟结果可为颗粒成核生长过程的调控以及工业化燃烧反应器的设计提供参考依据。
Gas phase combustion synthesis technology is a well-known chemical manufacturing technique for preparing nanomaterials.Nevertheless,the chemical reaction of precursors and the nucleation,growth,sintering and agglomeration of the nanoparticles make the whole combustion reaction zone be complicated.Flame chamber is the core equipment,and its structure affects the flow field parameters,ultimately determining the morphologies,structures and properties of the final products.In this work,three-dimensional geometric models of premixed high-speed jet flame reactors were developed,and the combustion simulations were carried out using k-εturbulence model,Eddy Dissipation Concept(EDC)and discrete phase model.Additionally,a 19-step detailed reaction mechanism of H2 was used for the temperature profile,velocity field and the particles residence time in high-temperature flame region.The effects of temperature,velocity and the reaction rate of H2 combustion under different outlet diameters of the burner center duct were systematically investigated.The simulation results indicate that increasing the diameter of the outlet of burner center duct leads to significant increase in the length of the high temperature region,and the attenuation of the central jet velocity drops off in the different scales of flame reactors.SiO2 nanoparticles were selected as discrete source in different scales of flame reactor,as well as for the study of residence time and back mixing in high temperature flame region.The results show that the residence time of the nanoparticles in the high temperature flame region is obviously increased,and the back-mixing phenomenon is aggravated.Together with the calculations,these results supply useful references for regulation and control of nucleation growth process of nanoparticles and provide theoretical fundamentals for industrial flame reactor design.