Methodology study on a unified surrogate model for the complex pyrolysis products of endothermic hydrocarbon fuel

• Published in: Fuel (Guildford) Vol. 329; p. 125547
• Main Authors: Peng, Hui-Sheng, Zhong, Bei-Jing
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2022
• Subjects: Combustion characteristic; Endothermic hydrocarbon fuel; Hypersonic vehicle energy; Pyrolysis product; Surrogate model; Pyrolysis product; Endothermic hydrocarbon fuel; Surrogate model; Combustion characteristic; Hypersonic vehicle energy
• ISSN: 0016-2361
• DOI: 10.1016/j.fuel.2022.125547

•A method for the unified surrogate model of pyrolysis products was proposed.•An octonary-component unified surrogate model was successfully constructed.•Key properties of surrogate model and targeted fuel were systematically compared.•Method of “carbon number + component type” can help better analyze complex fuels. A novel methodology for constructing a unified surrogate model for complex pyrolysis products was developed in this work. The concept of the unified surrogate model refers to the use of same representative components for different products, while their distinctions are reflected by content differences. Based on this method, a unified surrogate model was successfully developed for three different pyrolysis products, which contained eight components, i.e., hydrogen, methane, ethylene, and propane as pyrolysis gases and cyclohexene, toluene, decalin, and n-dodecane as pyrolysis liquids. Analysis results indicate that the model not only agrees well with the key properties of different targeted products but also successfully distinguishes their discrepancies. The experimental results of the laminar flame speeds obtained in this study further proved the accuracy of the model under various cracking and combustion conditions. The results also demonstrate that the concept and method of a unified surrogate model for different pyrolysis products are reasonable and feasible. It can be applied to other studies on the unified surrogate model for other complex pyrolysis products.