Bow Shock Wave Mitigation by Laser-Plasma Energy Addition in Hypersonic Flow

Oliveira, Antônio Carlos de; Minucci, M. A. S.; Myrabo, Leik N.; Toro, Paulo; Chanes, J. B.; Nagamatsu, H. T.

doi:10.2514/1.33933

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…e experimental results showed that the peak pressure of the bow shock and the type IV shock interference was reduced by 40% and 30%, respectively. Minucci et al [8][9][10][11] conducted a single-pulse laser drag reduction experiment in a hypersonic shock wave tunnel. e air spike structure was observed using direct photography.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Interaction between Nanosecond Pulsed Laser and Normal Shock Wave

Shi

Wang

Huang

2021

Shock and Vibration

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Nanosecond pulsed lasers possess two remarkable advantages: a high peak power density and the ability to break down air to form plasma readily. Therefore, they have significant practical value in the drag reduction of a supersonic body. An experimental investigation is conducted on the fundamental physical phenomenon of the interaction of the pulsed laser plasma with a normal shock wave to reveal the mechanism of drag reduction. Moreover, a high-precision schlieren system is developed to measure complex wave structures with a time resolution of up to 30 ns and a spatial resolution up to 1 mm. A high-speed particle image velocimetry system is set up to measure the velocity and vorticity of the flow field quantitatively; the system has a time resolution of up to 500 ns. The characteristics of the spherical shock wave and the high-temperature and low-density region induced by the laser plasma are presented. The flow characteristics and evolution process of the laser plasma under a normal shock wave are substantially revealed. The cause of the supersonic drag reduction by the pulsed laser plasma is illustrated with numerical simulation results. The following results are obtained in this study: the initial Mach number of the shock wave induced by the laser plasma increases with the laser energy, and the shape of the wave gradually evolves from a droplet shape to a spherical shape. The propagation velocity decreases with time and is close to the sound velocity after 50 μs. The shape of the initial high-temperature and low-density region is approximately spherical; it subsequently destabilizes to form a sharp spike structure in the laser’s incident direction. Ultimately, the region evolves into a double-vortex ring structure with upper and lower symmetry; the size of this region increases with the laser energy.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Interaction between Nanosecond Pulsed Laser and Normal Shock Wave

Shi

Wang

Huang

2021

Shock and Vibration

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“…The advance of experimental studies previously performed at the IEAv, with respect to the addition of laser energy pulses to investigate vehicle drag and heat transfer (Minnuci et al, 2005, Oliveira, 2008a, 2008b, 2008c, Salvador et al, 2005, 2007, 2008, has shown the need of numerical analyses to obtain a better understanding of the phenomena generally observed and also to support new experiments. Th erefore, in this work, which focused on understanding the properties of an energized fl ow without the presence of bodies, it is presented a numerical investigation of a localized steady energy addition to highspeed airfl ows, by varying the energy deposition rate and the spatial dispersion for diff erent free stream airfl ow speeds (Fraile Jr., 2011).…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of Localized and Steady Energy Addition to High Speed Airflows

Fraile

Rosa

2013

J.Aerosp. Technol. Manag.

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This work presents a numerical analysis of the gas dynamic problem of localized and steady energy addition to uniform high-speed airflows. Firstly, the general effects caused by a localized energy deposition on the flow were investigated, then an extensive parametric analysis concerning the effects of energy deposition rate and dispersion for different free stream flow speeds was performed. As a general result, localized and steady energy deposition generates compression waves and constant property flow stream tube downstream to the source. The parametric analysis results have shown that either increasing the rate or decreasing dispersion in the orthogonal direction to the flow of the deposited energy has the effect of enhancing property flow changes, which is even more pronounced for lower flow speeds. In contrast, energy dispersion in the flow direction has presented very little effect on the flow changes. The results of this numerical analysis should be very helpful in studies of energy addition applications in hypersonic.

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