Using the small-diameter pre-detonator is an important method to provide reliable and fast detonation to the denotation engines (i.e., pulse detonation engines or rotating detonation engines). This work examines the role of the overdriven state of ignition waves generated in pre-detonators on detonation transition modes in a flat chamber. For this purpose, a series of experiments are performed using different lengths of pre-detonators ($L_p$) with different mixtures to initiate the detonation in the main chamber. Results show that maintaining an overdriven state at the pre-detonator exit can significantly enhance the probability of fast detonation initiation (i.e., supercritical/critical mode) in the main chamber. Especially for the high nitrogen diluting ratio (β) mixtures, forming the overdriven detonation at the pre-detonator exit becomes a necessary condition for the fast initiation. As a result, the fast detonation initiation mode distributes in an upper-right shrinking ‘canyon’ in the $L_p$-β map. It is illustrated that the increased overdriven degree required for transitioning detonation wave under the higher β cases is responsible for this observation.

使用小直径预爆管是向引爆引擎（即脉冲爆震引擎或旋转爆震引擎）提供可靠而快速的爆震的重要方法。这项工作研究了在平坦室内的爆轰过渡模式下，预雷管中产生的点火波过驱动状态的作用。为此，使用不同长度的雷管（${\mathrm{大号}}_p$）与不同的混合物，以在主室中引发爆炸。结果表明，在雷管前出口处保持过度驱动状态可以显着提高主腔室中快速引爆开始（即超临界/临界模式）的可能性。尤其是对于高氮稀释比（β）混合物，在预雷管出口处形成过度驱动的爆炸成为快速起爆的必要条件。结果，快速爆炸起爆模式分布在炮弹的右上方收缩的“峡谷”中。${\mathrm{大号}}_p$- β地图。可以看出，在较高的β情况下，过渡爆轰波所需的过驱动度增加是造成这一现象的原因。