2-D Simulation with OH* Kinetics of a Single-Cycle Pulse Detonation Engine

Abstract

Two-dimensional computational fluid dynamics (CFD) simulation with selected kinetics for H2-air mixture of a hydrogen-fuelled single-pulse detonation engine were performed through ANSYS FLUENT commercial software for diagnostic purposes. The results were compared with Chapman-Jouguet (CJ) values calculated by the CEA (Chemical Equilibrium with Applications) and ZND (Zel'dovich-Neumann-Döring) codes. The CJ velocities and pressures, as the product velocities are in agreement, however, the CJ temperatures are too higher for 2-D simulations; as a consequence, the sound velocities were overpredicted. OH* kinetics added to the reaction set allowed visualization of the propagation front with several detonation cells showing a consistent multi-headed detonation propagating in the whole tube. The detonation front was slightly perturbed at the end of the tube with inclination of front edge and fewer cell numbers, and more significantly at the nozzle entrance with velocity reduction, resulting in a weak and unstable detonation. OH* images showed the detonation reaction zone decoupled from the shock front with disappearance of cellular structure. The inclusion of OH* reaction set for CFD simulation coupled to kinetics is demonstrated to be an excellent tool to follow the detonation propagation behaviour.

Numerical Study on the Effect of Jet on the Operation of Powder Fuel Scramjet

“…In order to save time and resources in the calculation process, Maciel and Marques (2019) conducted a two-dimensional computational fluid dynamics (CFD) simulation was performed on the hydrogenair mixture of a hydrogen fuel single pulse detonation engine. The results show that the two-dimensional model can accurately simulate the engine fuel mixing process.…”

A State of Art Review on Thermodynamics Performance Analysis in Pulse Detonation Combustor

“…They found that nozzle can effectively atomize fuel-air mixtures under high pressure condition. Maciel and Marques [41] studied on hydrogen fuelled single cycle pulse detonation engine in Ansys Fluent. When OH * kinetics added to the reaction set, they found cellular structure of detonation wave front in reaction zone.…”

Analytical Evaluation of Loss Mechanism Effects on PDE Performance with Variation of Refilling Beta Parameters

“…However, the engine based on detonation can attain greater thermodynamic efficiency for aerospace systems. It is well known that the application of analytical techniques to assess the performance of PDE using alternative fuels, and high Mach number has been regarded as one of the important influencing factors in the detonation [3].…”

“…While hydrogen fuel is widely used in aerospace applications for its numerous benefits, still it has drawbacks like high flammability limit, storage problems, and high expenses which have to be addressed [4]. Hence it is necessary to find alternative fuels for PDE; with pure and blended fuels, the purpose of this study is to conduct an analytical analysis of the effect of the filling factor on straight tube PDE [3]. Examining how fuel variety affects PDE is crucial in two ways: using blended fuels adds originality and provides relevant information to the ongoing PDE study.…”