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

Kim, Jae-Hyung; Matsuda, Atsushi; Sakai, Takeharu; Sasoh, Akihiro

doi:10.2514/1.j051145

Cited by 77 publications

(27 citation statements)

References 8 publications

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“…The lower density region in the quasi-stationary wave causes the bow shock to "lens" forward increasing the shock standoff distance. Kim et al 116 presented an earlier experimental study that confirms the same phenomenon as Hong et al 115 Figure 39,taken from Kim et al, 116 shows the build up of vortex structures upstream of the body and how the shock stand-off distance increases in comparison to the baseline flow in figure 39(a). This same feature was found in a numerical study by Sakai.…”

Section: Applications Of Laser Energy Depositionsupporting

confidence: 58%

Joule heating flow control methods for high-speed flows

Russell

Zare‐Behtash

Kontis

2016

Journal of Electrostatics

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Section: Applications Of Laser Energy Depositionsupporting

confidence: 58%

Joule heating flow control methods for high-speed flows

Russell

Zare‐Behtash

Kontis

2016

Journal of Electrostatics

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“…1) The energy deposition approach 2) is one of the non-mechanical drag reduction approaches, the idea of which was pioneered by Georgievskii and Levin. 3) A large number of the experimental [4][5][6][7][8][9][10][11][12][13] and numerical studies [14][15][16][17][18][19][20][21] about drag reduction using energy deposition can be found. Some of these studies have reported that the energy deposition method is also effective to mitigate the sonic boom applying the shock-wave mitigation effect of energy deposition.…”

Section: Introductionmentioning

confidence: 99%

Mach Number Effect on Supersonic Drag Reduction using Repetitive Laser Energy Depositions over a Blunt Body

Iwakawa

Shoda

Majima

et al. 2017

Trans. Japan Soc. Aero. S Sci.

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Supersonic drag reduction performance using repetitive pulse energy depositions over blunt bodies was experimentally studied under two Mach numbers. The normalized drag reduction and energy deposition efficiency of Mach-1.92 over a 10-mm-dia. blunt-cylinder model were 8% and 1.2 at most, respectively. On the other hand, these values at Mach-3.20 over the same model were 22% and 6.2, respectively. The shock-wave deformation period using single-pulse energy deposition at Mach-3.20 was 64 ®s. This duration was shorter than that of 80 ®s at Mach-1.92, but the deformation magnitude on the model center axis of 40% at Mach-3.20 was larger than that of 15% at Mach-1.92. These experimental characteristics were consistent as solutions of the Riemann problem. Moreover, a drag reduction performance was much improved with a larger model diameter of 20 mm. Therefore, it has been experimentally demonstrated that the drag reduction performance due to energy deposition improves much at a high Mach number and with large model dimensions.

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“…In 1996, Tret'yakov et al have achieved 45% drag reduction of cone model by using CO 2 laser pulses with repetition frequency up to 100 kHz in supersonic argon flow with a Mach 2.0, but η is smaller than one 3 . In 2000, Kim et al have demonstrated 21% supersonic drag decrement and η~7 of flat-faced cylinder model by using repetitive Nd:YVO 4 laser pulse 4 .…”

Section: Introductionmentioning

confidence: 99%

Supersonic Drag Reduction Performance of Blunt-Body with Conical Spike using with Energy Depositions

Iwakawa

Hasegawa

Osuka

et al. 2013

44th AIAA Plasmadynamics and Lasers Conference

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The blunt-body with conical spike model was suggested and demonstrated by experimentally and numerically. The results obtained from calculation was qualitatively agreed with measured results. The major purposes of this model are maintaining axisymmetric flow, achieving small baseline drag and keeping vortex residence time in shock layer. An experimenal visualization indicate that the axisymmetric flow was maintained by the effect of the conical spike. The measured and calculated results indicated the baseline drag become smaller by attaching conical spike than the cylinder model. The analyzed results obtained from calculation shows the vortex residence time in shock layer of attaching conical spike model have kept almost same time of the cylinder model under same repetition frequency of energy deposition. The drag and drag reduction performance shows that the tendency have less dependence of attaching conical spike but certain condition achieved better performance than cylinder model. The best performance achieved l cone =8.7mm, d cone /d cylinder =0.50 and f=60kHz.Nomenclature η = efficiency of energy deposition U = flow speed ΔD = drag reduction D = drag D 0 = baseline drag of cylinder model f = frequency E = deposited energy per pulse d cone = bottom radius of conical spike d cylinder = radius of cylinder part l cone = length of conical spike δ = shock stand-off distance s = distance of energy deposition area from model head of cylinder part Q = spatial distribution of deposited energy source λ = step function q 0 = total input power per unit mass x 0 = center position of deposited energy source r 0 = radius of deposited energy source t = elapsed time τ = deposited energy pulse duration η a = effectively-deposited energy ratio

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

Cited by 77 publications

References 8 publications

Joule heating flow control methods for high-speed flows

Joule heating flow control methods for high-speed flows

Mach Number Effect on Supersonic Drag Reduction using Repetitive Laser Energy Depositions over a Blunt Body

Supersonic Drag Reduction Performance of Blunt-Body with Conical Spike using with Energy Depositions

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