Lines of Pulsed Energy for Supersonic/Hypersonic Drag Reduction: Generation and Implementation

Kremeyer, Kevin

doi:10.2514/6.2004-984

Cited by 7 publications

(1 citation statement)

References 27 publications

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“…Experimental data on cones will allow us to further validate our computational methods, which can then be used to investigate optimized vehicle designs and to make scale models for further testing and advances in our wind-tunnel experiments. Additional areas for future investigation are to explore optimal geometry and frequency of energy deposition for flow control and drag reduction 54,55 ; use energy deposition to mitigate an adverse flow condition, as well as reduce drag; and develop dynamic, data-driven control for energy deposition to optimize drag reduction and shock mitigation.…”

Section: Numerical Simulation Summarymentioning

confidence: 99%

Computational Study of Shock Mitigation and Drag Reduction by Pulsed Energy Lines

2006

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A series of numerical experiments were performed in which energy was deposited ahead of a cone traveling at supersonic/hypersonic speeds. The angle of attack was zero, and the cone half-angles ranged from 15 to 45 deg. The Mach numbers simulated were 2, 4, 6, and 8. The energy was deposited instantaneously along a finite length of the cone axis, ahead of the cone's bow shock, causing a cylindrical shock wave to push air outward from the line of deposition. The shock wave would sweep the air out from in front of the cone, leaving behind a low-density column/tube of air, through which the cone (vehicle) propagated with significantly reduced drag. The greatest drag reduction observed was 96%. (One-hundred percent drag reduction would result in the complete elimination of drag forces on the cone.) The propulsive gain was consistently positive, meaning that the energy saved as a result of drag reduction was consistently greater than the amount of energy "invested" (i.e., deposited ahead of the vehicle). The highest ratio of energy saved/energy invested was approximately 6500% (a 65-fold "return" on the invested energy). We explored this phenomenon with a high-order-accurate multidomain weighted essentially nonoscillatory finite difference algorithm, using interpolation at subdomain boundaries. This drag-reduction/shock-mitigation technique can be applied locally or globally to reduce the overall drag on a vehicle.

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Section: Numerical Simulation Summarymentioning

confidence: 99%