搭建了隧道燃烧室流动点火平台,使用纳秒脉冲高频放电探索CH4/H2-空气预混气的流动点火特性.通过实验获得了不同掺氢比(a为0、5%、10%)和不同放电频率(f为10 k Hz、15 k Hz、20 kHz)对点火成功率Pig的影响.结果表明随着掺氢比和放电频...搭建了隧道燃烧室流动点火平台,使用纳秒脉冲高频放电探索CH4/H2-空气预混气的流动点火特性.通过实验获得了不同掺氢比(a为0、5%、10%)和不同放电频率(f为10 k Hz、15 k Hz、20 kHz)对点火成功率Pig的影响.结果表明随着掺氢比和放电频率的增加,点火能量相同时,Pig也迅速提高.在相同放电时间内存在最佳的放电功率,功率太高或太低都不利于点火.此外,通过数值计算模拟了初始火核的发展,进一步阐明了掺氢有利于提高Pig.展开更多
This paper focuses on the laminar flame instability of three high molecular weight n-alkanes,namely n-hexane,n-octane,and n-decane.The experiment was carried out in a constant volume combustion bomb to get the flame i...This paper focuses on the laminar flame instability of three high molecular weight n-alkanes,namely n-hexane,n-octane,and n-decane.The experiment was carried out in a constant volume combustion bomb to get the flame images.The critical radius under different conditions was extracted using the image processing program.Combined with the existing critical Peclet number theory,the dominant factors of flame instability under current conditions for three n-alkanes can be figured out.Moreover,the average cell size(equivalent cell radius,R_(cell))was extracted to provide quantitative analysis of the flame cellular structure,based on the method developed in this work.The theoretical R_(cell)were also calculated and compared with the experimental results to validate the proposed method.展开更多
文摘搭建了隧道燃烧室流动点火平台,使用纳秒脉冲高频放电探索CH4/H2-空气预混气的流动点火特性.通过实验获得了不同掺氢比(a为0、5%、10%)和不同放电频率(f为10 k Hz、15 k Hz、20 kHz)对点火成功率Pig的影响.结果表明随着掺氢比和放电频率的增加,点火能量相同时,Pig也迅速提高.在相同放电时间内存在最佳的放电功率,功率太高或太低都不利于点火.此外,通过数值计算模拟了初始火核的发展,进一步阐明了掺氢有利于提高Pig.
基金supported by the National Natural Science Foundation of China(52106182,51888103)the National Science and Technology Major Project(2019-Ⅲ-0018-0062)+1 种基金supported by the State Key Laboratory of Clean Energy Utilization(Open Fund Project No.ZJUCEU2021016)Shaanxi Nature Science Foundation(No.2021JQ-265)。
文摘This paper focuses on the laminar flame instability of three high molecular weight n-alkanes,namely n-hexane,n-octane,and n-decane.The experiment was carried out in a constant volume combustion bomb to get the flame images.The critical radius under different conditions was extracted using the image processing program.Combined with the existing critical Peclet number theory,the dominant factors of flame instability under current conditions for three n-alkanes can be figured out.Moreover,the average cell size(equivalent cell radius,R_(cell))was extracted to provide quantitative analysis of the flame cellular structure,based on the method developed in this work.The theoretical R_(cell)were also calculated and compared with the experimental results to validate the proposed method.
