|
Laser plasma drag reduction is a new method to reduce the wave drag of hypersonic flight. The research of the laser
plasma drag reduction performance is an important work. The purpose of this paper is investigating laser plasma drag
reduction by numerical simulation to enhance the understanding of the drag reduction mechanism, get the drag reduction
performance in different conditions, and provide references for laser plasma drag reduction experiment in the future.
Based on summarizing correlative references systematically, through building the model of energy deposition and
comparison the simulated results to the empirical formula and computation results to verify the program correctness, the
influence of laser energy parameters to laser plasma drag reduction were simulated numerically for optimize the
performance. The follow conclusions were got by numerical simulation:
The computation program can well simulate the interacting of LSDW(laser supported detonation wave) to the bow
shock in front of the blunt body. Results indicate that the blunt body drag could be decreased by injecting laser energy
into the incoming hypersonic flow. The correctness of program was verified by compare result to the experiment and
computation results.
Blunt body drag will be greatly decreased with injected laser power increased, The bigger laser power is injected, the
more drag decreases. There’s an energy saturation value for each laser power level, the injecting laser power
effectiveness values are never quite high for all laser power level.
There is an optimized energy deposition location in upstream flow, this location is right ahead of the blunt body.
When the distance from deposition location to the surface of blunt body is 5 times the blunt radius, blunt body drag
decreased the most.
This paper investigated the parameters which primary influence the performance of drag reduction. The numerical
simulation data and obtained results are meaningful for laser plasma drag reduction experiment investigation.
Aerodynamic drag, laser plasma, hypersonic, drag reduction, numerical simulation
|
