The MESG (maximum experimental safety gap) of CH₄H₂ mixtures were measured at different initial pressures (40–140 kPa). With an increase in hydrogen fraction, the classification of CH₄H₂ mixtures was from Group IIA to Group IIC. The mixtures were classified as Group IIB when the hydrogen fraction was between 25% and 77%, followed by Group IIC with continuous increase in the amount of hydrogen. For calculating MESG of CH₄H₂ blended fuel, the method based on oxygen amount is feasible at any initial pressure. It is different from Le Chatelier's equation, which is used to evaluate the low explosion limits for flammable mixtures but not suitable for calculating MESG. In this study, a formula calculating MESG-based laminar flame velocity and initial pressure was proposed to obtain the MESG of CH₄H₂ mixtures more easily.

中文翻译：

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CH4?H2混合燃料在不同初始压力下的最大实验安全间隙研究

_{CH 4}  H ₂混合物的MESG（最大实验安全间隙）是在不同的初始压力（40-140 kPa）下测量的。随着氢分数的增加，CH ₄  H ₂混合物的分类从 IIA 组到 IIC 组。当氢含量在 25% 和 77% 之间时，混合物被归类为 IIB 组，其次是 IIC 组，氢含量不断增加。用于计算 CH ₄  H _{2的 MESG}混合燃料，基于氧气量的方法在任何初始压力下都是可行的。它不同于 Le Chatelier 方程，后者用于评估易燃混合物的爆炸下限，但不适用于计算 MESG。本研究提出了基于MESG的层流火焰速度和初始压力计算公式，以更容易获得CH ₄  H ₂混合物的MESG。