Turbulent combustion mechanism of isomer bio-fuels in a high-pressure, high-temperature environment

为了研究同分异构体生物燃料的基础燃烧，在高压环境下进行了丙醇异构体和丙烷湍流预混火焰的实验。根据截面瞬时湍流火焰图像分析了每种燃料的局部火焰面密度。火焰表面密度分析结果表明，正丙醇、异丙醇和丙烷的固有火焰不稳定性不同。为了阐明化学反应与火焰不稳定性之间的关系，采用两步反应模型对固有火焰不稳定性进行了数值模拟，并对丙醇和丙烷/空气混合物的一维层流火焰进行了详细的化学模拟。结果表明，湍流火焰结构受C2中间体的扩散热效应的影响很大，这取决于同分异构体燃料和解离反应路径的差异。

For the fundamental combustion research of isomer biofuels, experiments of propanol isomers and propane turbulent premixed flame using OH-PLIF were performed in a high pressure environment. The local flame surface density for each fuel was analyzed from instantaneous turbulent flame images of cross-section. The results of the flame surface density analysis indicated differences of intrinsic flame instability for 1-propanol, 2-propanol and propane. Numerical simulations of intrinsic flame instability using a two-step reaction model as well as 1-D laminar flames using detail chemistry for propanol and propane/air mixtures were carried out to clarify the relationship between chemical reaction and flame instability. It was clarified that turbulent flame structure is highly affected by the diffusive thermal effects of C2 intermediate species, which depends on the isomer fuels and differences in dissociation reaction pathway.