Wave Drag Reduction with Acting Spike Induced by Laser-Pulse Energy Depositions

AIAA Journal ◽  
2011 ◽  
Vol 49 (9) ◽  
pp. 2076-2078 ◽  
Author(s):  
Jae-Hyung Kim ◽  
Atsushi Matsuda ◽  
Takeharu Sakai ◽  
Akihiro Sasoh
Keyword(s):  
Laser Pulse ◽  
Drag Reduction ◽  
Pulse Energy ◽  
Laser Pulse Energy ◽  
Wave Drag ◽  
Wave Drag Reduction

Baroclinic vortex influence on wave drag reduction induced by pulse energy deposition

2009 ◽  
Vol 21 (6) ◽  
pp. 066102 ◽  
Author(s):  
Yousuke Ogino ◽  
Naofumi Ohnishi ◽  
Shinichi Taguchi ◽  
Keisuke Sawada
Keyword(s):  
Drag Reduction ◽  
Pulse Energy ◽  
Energy Deposition ◽  
Wave Drag ◽  
Wave Drag Reduction

DYNAMICS OF COUNTER-FLOW INJECTION FOR WAVE DRAG REDUCTION

2018 ◽  
Author(s):  
Vishnu Prakash K ◽  
Siddesh Desai ◽  
Hrishikesh Gadgil ◽  
Vinayak Kulkarni
Keyword(s):  
Drag Reduction ◽  
Flow Injection ◽  
Wave Drag ◽  
Counter Flow ◽  
Wave Drag Reduction

Blunt-body wave drag reduction using focused energy deposition

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 460-467 ◽  
Author(s):  
David Riggins ◽  
H. F. Nelson ◽  
Eric Johnson
Keyword(s):  
Drag Reduction ◽  
Energy Deposition ◽  
Blunt Body ◽  
Body Wave ◽  
Wave Drag ◽  
Wave Drag Reduction

A numerical study on the single pulsed energy addition based unsteady wave drag reduction at varied hypersonic flow regimes

2020 ◽  
pp. 095441002097313
Author(s):  
Dathi SNV Rajasekhar Rao ◽  
Bibin John
Keyword(s):  
Steady State ◽  
Mach Number ◽  
Drag Reduction ◽  
Shock Layer ◽  
Blunt Body ◽  
Wave Drag ◽  
Flow Features ◽  
Energy Pulse ◽  
Energy Addition ◽  
Wave Drag Reduction

In this study, unsteady wave drag reduction in hypersonic flowfield using pulsed energy addition is numerically investigated. A single energy pulse is considered to analyze the time-averaged drag reduction/pulse. The blast wave creation, translation and its interaction with shock layer are studied. As the wave drag depends only on the inviscid aspects of the flowfield, Euler part of a well-established compressible flow Navier-Stokes solver USHAS (Unstructured Solver for Hypersonic Aerothermodynamics) is employed for the present study. To explore the feasibility of pulsed energy addition in reducing the wave drag at different flight conditions, flight Mach numbers of 5.75, 6.9 and 8.0 are chosen for the study. An [Formula: see text] apex angle blunt cone model is considered to be placed in such hypersonic streams, and steady-state drag and unsteady drag reductions are computed. The simulation results indicate that drag of the blunt-body can be reduced below the steady-state drag for a significant period of energy bubble-shock layer interaction, and the corresponding propulsive energy savings can be up to 9%. For energy pulse of magnitude 100mJ deposited to a spherical region of 2 mm radius, located 50 mm upstream of the blunt-body offered a maximum percentage of wave drag reduction in the case of Mach 8.0 flowfield. Two different flow features are found to be responsible for the drag reduction, one is the low-density core of the blast wave and the second one is the baroclinic vortex created due to the plasma energy bubble-shock layer interaction. For the same freestream stagnation conditions, these two flow features are noted to be very predominant in the case of high Mach number flow in comparison to Mach 5.75 and 6.9 cases. However, the ratio of energy saved to the energy consumed is noted as a maximum for the lower Mach number case.

Ultrahigh laser pulse energy and power generation at 10 kHz

2012 ◽  
Vol 37 (15) ◽  
pp. 3231 ◽  
Author(s):  
Frederik Fuest ◽  
Michael J. Papageorge ◽  
Walter R. Lempert ◽  
Jeffrey A. Sutton
Keyword(s):  
Power Generation ◽  
Laser Pulse ◽  
Pulse Energy ◽  
Laser Pulse Energy
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