2013
DOI: 10.2322/tastj.11.53
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Repetition Frequency Dependence of Wave Drag Reduction Induced by Laser-Pulse-Energy Depositions

Abstract: The mechanisms of drag reduction in a Mach 2 supersonic flow induced by repetitively deposited laser pulse energy are investigated through computational fluid dynamics based on Navier-Stokes equations for an axis-symmetric flow. The effectively deposited energy into the flow is determined by fitting a measured stagnation pressure history. With the repetition frequency lower than 20 kHz, the experimental flow-field, the residence time of baroclinically-generated vortex rings in the shock layer and drag reductio… Show more

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Cited by 7 publications
(5 citation statements)
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References 23 publications
(37 reference statements)
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“…In this simulation, the distance between the model surface of the cylinder and the center of the energy source is fixed; s=4Ă—r, shown in Figure 1. Absorption efficiency; η a and energy deposition area radius; r 0 are set to η a =0.4, r 0 =1.0mm obtained by previous investigations 7 . These values are fitted by the experimental results of the temporal pressure history.…”
Section: Experimental Setup and Calculation Methodsmentioning
confidence: 99%
“…In this simulation, the distance between the model surface of the cylinder and the center of the energy source is fixed; s=4Ă—r, shown in Figure 1. Absorption efficiency; η a and energy deposition area radius; r 0 are set to η a =0.4, r 0 =1.0mm obtained by previous investigations 7 . These values are fitted by the experimental results of the temporal pressure history.…”
Section: Experimental Setup and Calculation Methodsmentioning
confidence: 99%
“…[22][23][24] The drag reduction mechanisms enabled by energy deposition have been discussed using computational fluid dynamics. 12,15,25) Applying energy deposition a high-temperature low-density bubble, a so-called "thermal bubble" generated upstream, and the shock-wave is weakened when interacting with the bubble; the acoustic impedance of which is lower than that of the post-shock flow. As a result, the shock-wave extrudes upstream (lens effect 26) ).…”
Section: Introductionmentioning
confidence: 99%
“…15,27) The pressure in the shock layer is mitigated in the vortex ring, thereby reducing the drag. 25) This is the basic mechanism of drag reduction using energy deposition.…”
Section: Introductionmentioning
confidence: 99%
“…The absorption efficiency η and the laser-heated radius đť‘źđť‘ź 0 in Eq. ( 9) are set to 0.4 and 1.0 mm, respectively, based on the research of Iwakawa et al, [37][38] in which the same experimental equipment was used. The experimental measurements of the change in diameter of the bubble with different laser deposition energies are shown in Table I.…”
Section: 𝑓𝑓(𝑀𝑀mentioning
confidence: 99%