Data for: Lean combustion analysis using a corona discharge igniter in an optical engine fueled with methane and a hydrogen-methane blend

Since the amount of data that has been acquired, processed and presented in the paper is non-negligible, the Authors decided to share, as an example, only two combustion points data. Both these points are related to a lambda 1.4 air-CH4 mixture: one ignited by a conventional spark igniter, and one by an RF corona igniter. They have been acquired in the Internal Combustion Engine Lab of the University of Perugia, Department of Engineering. Authors agree to share further data upon request. ------------------------------------------------------------------------------------------------------- The shared data have been converted into an open-access format for sharing purposes: a .csv file for indicating analysis (only in-cylinder pressure is shown) and a .mp4 file (flame images). The .csv files contain the in-cylinder pressure traces in 103 columns: the first one is related to the crank angle degree value (one row each 0.1 CAD), the second one to the average pressure trace, and each of the following 101 is related to the in-cylinder pressure of a single combustion event. The .mp4 files contain the flame images related to one of the 101 combustion pressure traces reported in the corresponding .csv file. The temporal resolution is 0.3 CAD/frame, and the .mp4 speed, during the conversion, was set to 20 fps.

鉴于本文中采集、处理并展示的数据体量不容小觑，作者仅选取两组燃烧点数据作为示例予以共享。该两组数据均对应空燃比λ=1.4的空气-甲烷（air-CH4）混合气：一组采用传统电火花点火器（conventional spark igniter）点火，另一组采用射频电晕点火器（RF corona igniter）点火。本数据集采集自佩鲁贾大学工程系内燃机实验室。作者同意应需求共享更多相关数据。
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为便于共享，本次共享的数据已转换为开放获取格式：一份用于分析展示的.csv文件（仅展示缸内压力），以及一份.mp4文件（火焰图像）。该.csv文件共包含103列缸内压力轨迹数据：第一列为曲轴转角（Crank Angle Degree，CAD）数值，每0.1 CAD对应一行数据；第二列为平均压力轨迹；剩余101列分别对应单次燃烧事件的缸内压力数据。该.mp4文件对应展示上述.csv文件中101组燃烧压力轨迹之一的火焰图像。其时间分辨率为0.3 CAD/帧，转换过程中将.mp4的播放速率设置为20 fps（帧每秒）。