This paper explores turbulent autoignition and flame stabilisation for a range of fuels, utilising a jet in a hot coflow burner. Jet fuels including: hydrogen, dimethyl ether and hydrocarbons ranging from CH₄ to C₄H₈ are investigated with the influence of partial premixing, dilution and hot coflow temperature. Simultaneous acoustic emission measurements and high-speed chemiluminescence imaging at 10 kHz are performed; investigating the flame lift-off dynamics and to study the initiation and evolution of autoignition kernels. For all fuels studied, a common trend is found for increasing coflow temperatures; where a transition from high lift-off flames exhibiting an autoignition kernel dominated flame stabilisation mechanism, to lower lift-off flames exhibiting a premixed flame propagation stabilisation mechanism. Three key findings are reported: (i) common to all fuels studied for the high lift-off flames, the lift-off height vs. time follows a sawtooth-like trend. The leading edge of the main flame body (flame base) drifts downstream with near constant velocity, whilst upstream of the flame base autoignition kernels form and grow rapidly merging with the flame base; thereby lowering the tip of the flame base. (ii) High amplitude acoustic emission events correlate well with auto-ignition kernel flame base merging events for high lift-off flames, for the fuels studied. The ethylene flames produced the highest sound levels for a given mean lift-off height. (iii) In the high lift-off height regime, the lift-off height for all fuels scales well with corresponding simple 0-D auto-ignition delay calculations. The good correlation of the lift-off height scaling with the computed autionition delay implies that chemical kinetics, rather than turbulent mixing controls the processes at the base of these flames for higher lift-off height flames, indicating that autoignition is the dominant stabilising mode.

本文利用热同流燃烧器中的射流探索了多种燃料的湍流自燃和火焰稳定化。喷气燃料包括：氢，二甲醚和CH ₄至C ₄ H ₈范围内的烃研究了部分预混合，稀释和热同流温度的影响。同时进行声发射测量和10 kHz的高速化学发光成像。研究火焰剥离动力学，并研究自燃核的引发和演化。对于所有研究的燃料，发现共流温度升高的共同趋势是：在这种情况下，从表现出自燃核的高升空火焰过渡到主要的火焰稳定机制，再到展现出预混合火焰传播稳定机制的低升空火焰过渡。报告了三个主要发现：（i）对于所有用于高起燃火焰的研究燃料，其起燃高度随时间的变化呈锯齿状趋势。主火焰体（火焰基体）的前缘以几乎恒定的速度向下游漂移，而在火焰基体的上游自燃核形成并迅速增长，并与火焰基体融合。从而降低了火焰底座的尖端。（ii）对于所研究的燃料，高振幅声发射事件与高升空火焰的自燃内核火焰基础合并事件密切相关。在给定的平均起升高度下，乙烯火焰产生的声音最高。（iii）在高起升高度范围内，所有燃料的起升高度均可以通过相应的简单0-D自燃延迟计算来很好地缩放。提离高度标度与计算出的拍卖延迟之间的良好相关性意味着化学动力学，