Role of overdriven state of ignition wave in pre-detonators on detonation transition modes in a flat chamber

Qingchun Lei, Xiaocun Zhao, Jiawei Zheng, Jiannan He, Ke Wang, Wei Fan

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

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 (Lp) 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 Lp-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.

Original languageEnglish
Article number106771
JournalAerospace Science and Technology
Volume115
DOIs
StatePublished - Aug 2021

Keywords

  • Detonation transition
  • High-speed imaging
  • Overdriven detonation
  • Pre-detonator

Fingerprint

Dive into the research topics of 'Role of overdriven state of ignition wave in pre-detonators on detonation transition modes in a flat chamber'. Together they form a unique fingerprint.

Cite this