Effects of Variable Total Pressures on Instability and Extinction of Rotating Detonation Combustion

Instability, extinction and re-initiation of rotating detonation in a two-dimensional Rotating Detonation Engine (RDE) configuration are numerically investigated, and the emphasis is laid on the effects of variable total pressures on the above combustion dynamics. Two conditions, i.e. different cons...

Full description

Saved in:
Bibliographic Details
Published in:Flow, turbulence and combustion turbulence and combustion, 2020, Vol.104 (1), p.261-290
Main Authors: Zhao, Majie, Li, Jiun-Ming, Teo, Chiang Juay, Khoo, Boo Cheong, Zhang, Huangwei
Format: Article
Language:English
Subjects:
Automotive Engineering
Combustion stability
Configurations
Detonation
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Extinction
Fluid- and Aerodynamics
Heat and Mass Transfer
Low pressure
Rotation
Surface stability
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Instability, extinction and re-initiation of rotating detonation in a two-dimensional Rotating Detonation Engine (RDE) configuration are numerically investigated, and the emphasis is laid on the effects of variable total pressures on the above combustion dynamics. Two conditions, i.e. different constant pressures and time-varying pressures, are considered to investigate the combustion instability in RDE. It is seen that under constant pressure condition the rotating detonation is more prone to instability at low pressure, due to the instability from the deflagrative surface. The intrinsic frequency for the unstable cases with different pressures is close, and maybe related to the RDE configuration and/or fuel properties. For the time-varying pressures with various specified frequencies, the RDE shows the different levels of instability characterized by multiple frequencies. The dominant frequencies vary, depending on the competition between the forced external frequency and the intrinsic one induced by the RDE system. About the extinction of continuously rotating detonation, it can be found that when the total pressure is reduced to a relatively lower value the detonation is quenched and left with deflagrative combustion. Furthermore, when the total pressure is increased based on the extinguished flow fields, detonation fronts are re-initiated due to the local high pressure. The stochasticity in RDE re-initiation has been found, in terms of the location and number of initial detonation front, the propagation direction, their interaction and final stabilization.
ISSN:1386-6184
1573-1987
DOI:10.1007/s10494-019-00050-y