摘要
选用等体积比的CO和H_(2)合成气为燃料,研究伴流微混单喷嘴的火焰结构。在Fluent平台上,采用稳态不可压的N-S方程进行求解,探究不同出口流速和当量比对微混单喷嘴火焰结构的影响。结果表明:OH的分布与高温区域基本重合,且化学反应释热率与OH高浓度区域相一致。随当量比增加,空气侧流速降低,火焰前缘逐渐相连,最终火焰附着在喷嘴出口;喷嘴出口流速的增加则强化了射流夹带作用,使其携带环境中的HO_(2)和O_(2),迅速将H氧化为OH,从而收缩反应区域厚度;伴流作用促进CO氧化生成HCO的过程,降低主燃火焰向环境散热。
The study investigates the flame structure of a coflow micromixer single nozzle using CO and H_(2) synthesis gas with an equimolar ratio.The simulations are conducted in the Fluent platform employing steady-state,incompressible Navier-Stokes equations to examine the effects of various exit velocities and equivalence ratios on the flame structure.The results indicate that the distribution of OH aligns closely with the high-temperature zone,consistent with the heat release rate of chemical reactions in regions of high OH concentration.With an increase in equivalence ratio,the airflow velocity on the air side decreases,leading to the gradual merging of the flame fronts,ultimately resulting in the flame attachment at the nozzle exit.Increasing the exit velocity of the nozzle enhances jet entrainment,carrying HO_(2) and O_(2) from the surroundings,and rapidly oxidizing H to OH,thereby reducing the thickness of the reaction zone.Coflow facilitates the process of CO oxidation to generate HCO,consequently reducing the heat dissipation of the main flame to the surroundings.
作者
刘海清
吕亚锦
张林瑶
邢畅
刘栗
邱朋华
LIU Haiqing;LÜYajin;ZHANG Linyao;XING Chang;LIU Li;QIU Penghua(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,China;Shanghai Institute of Space Propulsion,Shanghai 201112,China)
出处
《新能源进展》
CSCD
北大核心
2024年第2期117-123,共7页
Advances in New and Renewable Energy
基金
国家自然科学基金项目(52206138)。
关键词
微混燃烧
伴流
合成气
micromix combustion
coflow
syngas
