Self-Consistent Computational Fluid Dynamics of Supersonic Drag Reduction via Upstream-Focused Laser-Energy Deposition

Alberti, Andrea; Munafò, Alessandro; Pantano, Carlos; Panesi, Marco

doi:10.2514/1.j059612

Cited by 17 publications

(1 citation statement)

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“…In the early stage of DPL ignition, the laser plasma is in a nonequilibrium state because a significant part of the laser energy at an electron temperature of approximately 1 eV is spent on the vibrational excitation of nitrogen molecules. Recent results also suggest that the dualpulse-based system can ignite a mixture in turbulent flow considering an extremely high initial degree of ionization [53], enhanced flow control, and drag reduction in supersonic flows [54,55], and can support a plasma-enhanced deflagration to detonation transition (DDT) [56]. Numerical studies of DPL ignition in a frame of one-and two-dimensional (2D) threetemperature plasma models have shown that the initial electron number density pattern created by the first laser pulse can tailor the ignition kernel dynamics.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of nonequilibrium plasma-enhanced ignition in the event of dual-pulse laser energy deposition

Mahamud¹

2022

J. Phys. D: Appl. Phys.

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A two-dimensional and three-temperature mathematical model for dual-pulse laser ignition was applied to study the mechanism of the nonequilibrium plasma process during dual-pulse laser energy deposition. The two-dimensional model could predict the influence of the reaction kinetics and nonequilibrium effects on the ignition delay time and kernel dynamics. As the plasma reaction rates were extremely fast compared with the combustion reaction rates, it can be predicted that the variability of the plasma lifetime will directly influence the ignition delay time and reaction kinetics. The results suggested that the energy relaxation rate from the electronic state was rapid compared to that from the vibrational state due to the short lifetime of the plasma state. However, the relatively slower energy relaxation from the vibrational state provided long-term thermalization of the ignition kernel. For the same level of energy deposition, the nonequilibrium plasma system predicted a higher rate of vorticity generation, signifying a higher level of mixing and baroclinicity production. The results also suggested that ignition in a premixed fuel airflow required a higher degree of energy deposition, due to a higher rate of radical and thermal losses.

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