| Title: |
Numerical Simulation of the Transition to Detonation in a Hydrogen–Air Mixture Due to Shock Wave Focusing on a 90-Degree Wedge †. |
| Authors: |
De La Hoz, Jose Bermudez1 (AUTHOR), Rudy, Wojciech1 (AUTHOR), Teodorczyk, Andrzej1 (AUTHOR) andrzej.teodorczyk@pw.edu.pl |
| Source: |
Energies (19961073). Feb2025, Vol. 18 Issue 3, p619. 15p. |
| Subject Terms: |
*DETONATION waves, *SHOCK waves, *COMPUTATIONAL fluid dynamics, *COMPUTER simulation, *COMBUSTION |
| Abstract: |
This study numerically explores the initiation of detonation through shock wave reflection and focusing on a 90-degree wedge in varying mixtures of hydrogen–air. The simulations were conducted using the ddtFoam code, an integral part of the OpenFOAM open-source Computational Fluid Dynamics (CFD) package of density-based code for solving the unsteady, compressible Navier–Stokes equations. The simulation results unveil three potential outcomes in the corner post-reflection: deflagrative ignition in the corner, deflagrative ignition with intermediate transient phases leading to a delayed transition to detonation in the trailing combustion zone close to the apex of the wedge, and ignition with an immediate transition to detonation, resulting in the formation of a detonation wave in the corner tip. In the experimental investigation, the transition velocity for the stoichiometric mixture stood at approximately 719 m/s. In contrast, the numerical simulation indicated a transition velocity of 664 m/s for the same stoichiometric mixture, reflecting a 5.5% decrease in velocity. Such an underestimation level of 5–8% by the simulation results was observed for mixtures of 25–45% H2 in air. [ABSTRACT FROM AUTHOR] |
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