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Propagation Behaviors of the Rotating Detonation Wave in Kerosene–Air Two-Phase Mixtures with Wide Equivalence Ratios
Flow, Turbulence and Combustion
Swansea University Author: Zhaoxin Ren
Accepted Manuscript under embargo until: 26th December 2023
DOI (Published version): 10.1007/s10494-022-00393-z
Rotating detonation engine (RDE) with pressure gain is innovative for propulsion. To evaluate the RDE using liquid fuel, the rotating detonation wave (RDW) with kerosene droplets is numerically studied. The Eulerian–Lagrangian two-phase flow model is applied to predict the propagation features of th...
|Published in:||Flow, Turbulence and Combustion|
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Rotating detonation engine (RDE) with pressure gain is innovative for propulsion. To evaluate the RDE using liquid fuel, the rotating detonation wave (RDW) with kerosene droplets is numerically studied. The Eulerian–Lagrangian two-phase flow model is applied to predict the propagation features of the RDW and the quenching phenomenon. A hybrid WENO scheme is used to capture the shock/detonation wave and a reduced reaction model is applied. This research analyzes the influence of the equivalence ratio on the dynamics of propagation and quenching of RDW by applying comparative simulations with liquid kerosene and pre-evaporated kerosene. The focus is fixed on the stable operation limits as a function of the equivalence ratio. The results under the present conditions show that the RDWs formed in the two-phase mixtures have a narrower stable propagation regime of the equivalence ratio than that of the RDWs fueled with pre-evaporated kerosene. The difference between the gaseous and two-phase RDWs becomes obvious under the fuel-rich conditions, and the RDW is strengthened in the gaseous flow but is weakened in the two-phase mixture. The change of the kerosene fuel from vapours to droplets results in a bifurcated wave structure near the inlet due to the interactions among droplets, shock waves, and flame. For the quenching mechanism, the fuel-lean quenching is from the lack of reactive mixtures from the droplet evaporation near the inlet, and the fuel-rich quenching is attributed to the absence of the transverse waves from the triple point. The comparative study shows that the fuel-rich injection is more suitable to generate stable RDWs within the present initial conditions.
Rotating detonation wave; Two-phase; Equivalence ratio; Propagation; Quenching
Faculty of Science and Engineering
This work is partially supported by start-up funding from Swansea University.