微波辅助点火增强模式及其转化研究  

Microwave Assisted Ignition Enhancement Model and Its Transformation

作　　者：吴慧珉 张毅[2] 李荣杰 刘超辉 许景星 王兆文[1] 成晓北[1] Wu Huimin;Zhang Yi;Li Rongjie;Liu Chaohui;Xu Jingxing;Wang Zhaowen;Cheng Xiaobei(School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Zhejiang Geely Holding Group,Hangzhou 310051,China)

机构地区：[1]华中科技大学能源与动力工程学院,武汉430074 [2]浙江吉利控股集团有限公司,杭州310051

出　　处：《燃烧科学与技术》2025年第2期129-137,共9页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51576083).

摘　　要：基于微波辅助点火的定容弹台架,对当量比为0.7下的甲烷-空气混合物进行了微波增强的点火试验.采用了功率诊断检测能量吸收,并以等离子体在各个方向的冲击量化评估点火核心增强效果.研究表明,随着微波功率的提高,先后出现了两种表观特性截然不同的等离子体,即辉光和炽光等离子体,并分别对应不同的微波增强模式.随后研究了气体参数(气体压力、气体组分)对两种增强模式以及转换过程的影响,研究表明,较高的压力(0.4 MPa)能促进炽光等离子体的出现,并能使增强效果的负压效应失效.此外,甲烷能抑制炽光增强的发生,这可能是因为其生成产物水和二氧化碳能削弱等离子体对微波能量的吸收.并且与氮气相比,氧气更能使炽光增强的功率转变临界值提前.炽光增强模式下的能量吸收与入射功率间存在明显的线性关系,此时等离子体内电子数密度相对稳定.The ignition experiment of methane-air mixture with the equivalent ratio of 0.7 was carried out by microwave enhancement based on a constant volume bomb bench with microwave assisted ignition.Power diagnosis was used to detect energy absorption,and the effect of ignition kernel enhancement was evaluated by quantification of plasma impact in all directions.The results show that with the increase of microwave power,two kinds of plasma with distinctly different characteristics appear successively,namely glow plasma and incandescent plasma,which correspond to different microwave enhancement modes.Subsequently,the effects of gas parame-ters(gas pressure and gas composition)on the two enhancement modes and the conversion process were studied.The results show that higher pressure(0.4MPa)can promote the emergence of incandescent plasma,and make the pressure constraint effect of enhancement ineffective.In addition,methane inhibits the enhancement of incandescence because the resulting water and carbon dioxide reduce the absorption of microwave energy by the plasma.Moreover,compared with nitrogen,oxygen can bring forward the critical value of the power transition of incan descent enhancement.There is an obvious linear relationship between the energy absorption and the incident power in the incandescent enhancement,and the electron number density in the plasma is relatively stable.

关 键 词：微波辅助点火 辉光增强 炽光增强 等离子体 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]