Work

Experimental study of the perturbation of the cavity on the deflagration to detonation transition

Year: 2024

Type: article

Abstract: The perturbation in the deflagration to detonation transition process is investigated experimentally by utilizing one cavity and three successive cavities to induce weak and strong turbulences, respectively. The cavity serves as a "hot spot" in propagating deflagration , generating a pulse of shock waves locally and accelerating its velocity. The results suggest three modes of cavity perturbation on deflagration acceleration: direct transition to detonation, secondary acceleration to detonation after a long distance of steady propagation or mild decline in velocity, and failure to transition to detonation. This variation can primarily be attributed to various strengths of the precursor shock resulting from the acceleration of the flame by the cavity disturbance. The cavity perturbation must satisfy specific critical conditions to directly assist in the deflagration-to-detonation transition. Firstly, the escalated flame velocity due to the cavity perturbation must exceed the sound speed in combustion products . Secondly, the acceleration of the velocity rise must surpass specific critical values for the transition to detonation to be smoothly completed without a secondary acceleration.

Source: Combustion and Flame

DOI: 10.1016/j.combustflame.2024.113917

Authors: Tianbao Ma, Deyao Wu, Jian Li

Institutions: Beijing Institute of Technology, State Key Laboratory of Explosion Science and Safety Protection

Language: English

Topic: Combustion and Detonation Processes

Subfield: Aerospace Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,800

Funder: National Natural Science Foundation of China