A new experimental method for evaluating the detonability of fuel–air mixtures (FAMs) based on measuring the deflagration-to-detonation (DDT) run-up distance and/or time in a standard pulse detonation tube (SDT) is used to rank gaseous premixed and non-premixed FAMs by their detonability under substantially identical thermodynamic and gasdynamic conditions. In the experiments, FAMs based on hydrogen, acetylene, ethylene, propylene, propane–butane, n-pentane, and natural gas of various compositions, as well as FAMs based on the gaseous pyrolysis products of polypropylene (PP), are used: from extremely fuel-lean to extremely fuel-rich at normal temperatures and pressures. The concept of equivalent FAMs exhibiting the same or similar detonability under the same conditions is proposed. Equivalent FAMs can be used for predictive physical modeling of detonation processes involving FAMs of other fuels. The ranking of FAMs in terms of their relative detonability allows choosing a propylene FAM for physical modeling of the operation process in the PP-fueled solid-fuel ramjets operating on detonative combustion.

中文翻译：

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燃料-空气混合物的爆炸性

基于测量标准脉冲爆震管 (SDT) 中的爆燃至爆震 (DDT) 助跑距离和/或时间来评估燃料-空气混合物 (FAM) 爆震性的新实验方法用于对气体进行分级预混和非预混 FAM 在基本相同的热力学和气体动力学条件下的爆炸性。在实验中，使用了基于氢气、乙炔、乙烯、丙烯、丙烷-丁烷、正戊烷和各种成分的天然气的 FAM，以及基于聚丙烯 (PP) 气态热解产物的 FAM：从在常温常压下极度贫油到极度富油。提出了在相同条件下表现出相同或相似爆炸性的等效 FAM 的概念。等效的 FAM 可用于对涉及其他燃料的 FAM 的爆轰过程进行预测性物理建模。FAM 在其相对爆炸性方面的排名允许选择丙烯 FAM 来对 PP 燃料固体燃料冲压发动机的操作过程进行物理建模。