Numerical Investigation of Detonation Combustion Wave in Pulse Detonation Combustor with Ejector

Detonation combustion based engines are more efficient compared to conventional deflagration based engines. Pulse detonation engine is the new concept in propulsion technology for future propulsion system. In this contrast, an ejector was used to modify the detonation wave propagation structure in pulse detonation engine combustor. In this paper k-ε turbulence model was used for detonation wave shock pattern simulation in PDE with ejectors at Ansys ۱۴ Fluent platform. The unsteady Euler equation was used to simulate the physics of detonation wave initiation in detonation tube. The computational simulations predicted the detonation wave flow field structure, combustion wave interactions and maximum thrust augmentation in supersonic condition with ejectors at time step of ۰.۰۳۴s. The ejector enhances the detonation wave velocity which reaches up to ۲۲۲۶ m/s in detonation tube at same time step, which is near about C-J velocity. Further the time averaged detonation wave pressure, temperature, wave velocity and vortex characteristics interaction are obtained with short duration of ۰.۰۲۳s and fully developed detonation wave structures are in good agreement with experimental shadowgraph, which are cited from previous experimental research work.

Keywords:

Detonation , Ejector , Computational fluid dynamics , Pulse detonation engine , Thrust