1. 上海交通大学 动力机械与工程教育部重点实验室， 上海 200240；2. 中国船舶重工集团有限公司第七一一研究所， 上海 201108
出版日期:2020-05-28发布日期:2020-06-02通讯作者:具德浩，男，副教授，博士生导师，电话(Tel.)：021-34205949; E-mail: d.ju@sjtu.edu.cn.作者简介:许晓晨(1993-)，女，吉林省吉林市人，硕士生，研究方向为内燃机的燃烧与图像处理.基金资助:国家自然科学基金重大计划重点项目(91641202)，上海市自然科学基金资助项目(18ZR1418700)Jet Flame Propagation Characteristics of Methane/Air Mixture in a Large Bore Constant Volume Chamber Based on MATLAB Image Processing Method
XU Xiaochen 1,LI Xiang 1,2,HUANG Zhong 1,JU Dehao 1,Lü Xingcai 1,HUANG Zhen 11. Key Laboratory for Power Machinery and Engineering of Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China;2. Shanghai Marine Diesel Engine Research Institute, Shanghai 201108, China
Online:2020-05-28Published:2020-06-02摘要/Abstract
摘要： 在带有预燃室的大缸径定容燃烧系统中进行甲烷/空气射流引燃主燃室内预混气体的实验研究.基于MATLAB软件平台编写火焰图像批处理算法,并通过该算法进行图像预处理进而获取特征参数；通过分析瞬时压力曲线以及高速摄影仪拍摄的火焰传播图像，研究甲烷/空气预混射流火焰的传播特性以及初始压力和过量空气系数等初始条件对射流火焰发展过程及火焰传播速度的影响.研究结果表明：位于预燃室中的火花塞偏置会造成主燃室内的引燃射流火焰的不均衡发展，且这种不均衡性在过量空气系数越小时愈发严重；射流火焰传播速率随初始压力和过量空气系数的增大而减小，并且当过量空气系数较小(λ=0.8)时，射流火焰对背压的变化较为敏感.
关键词: 定容燃烧弹, 射流火焰, 图像处理, 火焰传播
Abstract: To explore the ignition characteristics of methane/air mixture generated by the pre-chamber turbulent jets, experimental studies were conducted in a large bore constant volume chamber. The flame image batch processing was conducted by using MATLAB software to obtain the flame characteristic parameters. By analyzing the pressure variations and flame images taken by a high-speed camera, the effects of air-fuel equivalence ratios and pre-mixed pressures on jet flame ignition process and flame propagation were studied. The results show that the jet flames in the main chamber are asymmetry, which can be even worse when the air-fuel equivalence ratio is lower due to the asymmetric orientation of the spark plug. As the initial pressure or air-fuel equivalence ratios increase, the flame propagation becomes slower. Furthermore, with the lower air-fuel equivalence ratio (λ=08), the flame propagation tends to be more sensitive to the back pressure variation.
Key words: constant volume chamber, jet flame, image processing, flame propagation
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