研究目的
To study the dynamics of plasma generated by the dual-pulse laser in a supersonic flow and its effects on drag, pressure signature, and vorticity generation around a wedge.
研究成果
The numerical model demonstrated that nonequilibrium plasma is more effective in drag reduction compared to thermal plasma, with a maximum drag reduction of around 50%. The study concluded that the main effect of plasma on supersonic flow is attributed to low-density core formation, with surface pressure changes not significantly influenced by vorticity generation.
研究不足
The study focused on numerical simulations without experimental validation for all aspects. The effects of initial ionization level and non-uniformity of the formed laser plasma were examined, but practical implementation challenges and energy efficiency in real-world applications were not fully addressed.
1：Experimental Design and Method Selection:
The study utilized a mathematical model including species, momentum, electronic, vibrational, and translational energy equations for multicomponent ionized air. The model was solved using a custom-made solver based on OpenFOAM C++ libraries, employing a finite volume method and a PIMPLE algorithm for coupling continuity and momentum equations.
2：Sample Selection and Data Sources:
The simulations were based on Navier-Stokes equations for a compressible ideal gas with specified free stream conditions.
3：List of Experimental Equipment and Materials:
The study did not specify physical equipment but mentioned the use of OpenFOAM C++ libraries for numerical simulations.
4：Experimental Procedures and Operational Workflow:
The model simulated a steady supersonic flow around a wedge, followed by the introduction of dual-pulse laser energy deposition to study its effects on the flow dynamics.
5：Data Analysis Methods:
The analysis focused on temporal dynamics of the formed air plasma, drag reduction, pressure distribution, and vorticity generation.
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