Large eddy simulation of non-reacting flow and mixing fields in a rotating detonation engine

•LES of the non-reacting flow/mixing fields in a model rotating detonation engine is performed.•The instantaneous vortex structures are similar to those in jet in crossflow.•Mixing efficiency and local composition with different mass flow rates are analysed.•The LES results of the linearized burner...

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Bibliographic Details
Published in:Fuel (Guildford) 2020-11, Vol.280, p.118534, Article 118534
Main Authors: Zhao, Majie, Zhang, Huangwei
Format: Article
Language:English
Subjects:
Aerodynamics
Air flow
Cross flow
Detonability range
Detonation
Flow rates
Flow velocity
Fuel injection
Injection
Large eddy simulation
Non-premixed reactant
Nonuniformity
Orifices
Periodic burner sector
Reacting flow
Rotating detonation engine
Rotation
Shock waves
Turbulent mixing
Vortices
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Summary:•LES of the non-reacting flow/mixing fields in a model rotating detonation engine is performed.•The instantaneous vortex structures are similar to those in jet in crossflow.•Mixing efficiency and local composition with different mass flow rates are analysed.•The LES results of the linearized burner well reproduce those from full-scale RDE. Large Eddy Simulations (LES) of the non-reacting flow and mixing fields in a Rotating Detonation Engine (RDE) from Air Force Research Laboratory (AFRL) are performed. Effects of the total number of fuel injection orifices and air flow rates on the mixing in the AFRL RDE are studied using a periodic burner sector with five injection orifices. The instantaneous vortex structures and shock wave in the non-reactive AFRL RDE are identified, and the structures are found to be similar to those in jet in crossflow. Also, the compositional non-uniformity in the height and azimuthal directions of the burner is observed. The mixing efficiency, root-mean-square value of the hydrogen mass fraction and mixing area ratios are introduced to quantify the mixing process. The observations from LES qualitatively justify the behaviors of detonation fronts observed in the experiments. Finally, results based on full scale AFRL RDE are briefly discussed.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2020.118534