Measurement of subsonic laser absorption wave propagation characteristics at 10.6 μm

Klosterman, E. L.; Byron, S. R.

doi:10.1063/1.1663130

Cited by 46 publications

(7 citation statements)

References 3 publications

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“…l This has been observed at flux levels in excess of 3xl0 4 W/cm 2 , for CO 2 lasers at 10.6 ^m (Ref. 2). At substantially greater flux levels (greater than 10 7 W/cm 2 ), the short absorption length of the radiation allows a laser supported detonation (LSD) wave to form.…”

Section: Introductionmentioning

confidence: 90%

Modeling of Momentum Transfer to a Surface by Laser-Supported Absorption Waves

Reilly¹,

Ballantyne²,

Woodroffe³

1979

AIAA Journal

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A simplified parametric model of the flowfield produced by impingement of a high-energy laser pulse onto a nonablative surface in a static environment is described. An attempt has been made to account for the twodimensional effects arising out of the rarefaction structure within the laser-heated gases. An optimization model is developed to indicate the laser spot size, pulse width, and intensity dependencies of the efficiency of delivery of both impulse and mechanical energy to the target surface.velocity u(x) = axial velocity v = velocity behind shock in LSC model V w = LSC wave speed W = nondimensional particle velocity x = axial coordinate a =(Kt) y = ratio of specific heats in plasma 70 = ratio of specific heats in air p = density o = target material density Tf) = pulse length T Z = axial relaxation time T 2D = radial relaxation time T = normalized pulse time (= r p /r 2D ) T O = pressure relaxation time $0 = incident laser flux intensity, W/cm 2 Subscripts LSC = laser supported combustion condition LSD = laser supported detonation condition 0 = ambient r = condition behind rarefaction s = surface, spot

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Section: Introductionmentioning

confidence: 90%

Modeling of Momentum Transfer to a Surface by Laser-Supported Absorption Waves

Reilly¹,

Ballantyne²,

Woodroffe³

1979

AIAA Journal

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“…In all cases, the predicted velocities for the air plasmas are substantially less than those observed by Klosterman and Byron. 12 At present, there are no reliable measurements for hydrogen. Various mechanisms have been proposed to explain the discrepancy: radiation transport, 8 nonequilibrium radiation mechanisms, 9 and two-dimensional effects 10 ; but incorporation of these mechanisms into models of the LSC wave has not as yet resulted in realistic predictions of the observed wave speeds.…”

Section: Introductionmentioning

confidence: 98%

A re-examination of the laser-supported combustion wave

1985

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The basic equations and numerical solution procedures for a laser-supported "combustion" wave were reexamined with the objective of obtaining an unambiguous solution for the entire wave, including the region far downstream of the temperature peak. Correct boundary conditions far downstream of the wave were determined and a technique for numerical solution of the entire boundary value problem was developed. Solutions obtained for laser-supported combustion waves in hydrogen were compared with results of the shooting technique of Kemp and Root. The latter technique yields essentially the same relationship between incident laser intensity and mass flux through the wave as our complete solution. However, the Kemp-Root technique provides a solution for only part of the wave and is incapable, in general, of correctly predicting the fraction of incident laser intensity absorbed in the wave. The complete wave solution is also applicable to the propagation of lasersupported waves away from a fixed end wall at large times after the wave is initiated at the wall.

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“…The evaporated atoms are ionized and become plasma. The plasma produced in both situations mentioned above has high temperature and pressure, so it expands rapidly and provides a force for the target [3]. The target obtains an impulse as the plasma expands.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of laser-supported combustion wave induced by millisecond-pulsed laser on aluminum alloy

Zhang¹,

Wei²,

Wang³

et al. 2015

Laser Phys.

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In this paper, the energy transmission of a laser-supported combustion wave (LSCW) is numerically studied, which includes inverse bremsstrahlung, thermal conduction and convection. A physical model is established to simulate an LSCW induced by millisecond-pulsed laser on aluminum alloy. This physical model is a 2D axis-symmetric numerical model of radiation gas dynamics. Moreover, the simulation focuses on the interaction process in different laser conditions such as various pulse widths and peak energies. As a result, the speed of the LSCW increases by increasing the laser energy while keeping the laser pulse constant, whereas the speed is reduced by increasing the laser pulse width while keeping the laser energy constant. After a comparison of the theoretical, numerical and experimental results, analyses are performed while the experimental results are explained reasonably. Furthermore, the consistency between the numerical and experimental results implies that the numerical calculation model used in this paper can describe the motion of the LSCW of the millisecond-pulsed laser on aluminum alloy very well.

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Measurement of subsonic laser absorption wave propagation characteristics at 10.6 μm

Cited by 46 publications

References 3 publications

Modeling of Momentum Transfer to a Surface by Laser-Supported Absorption Waves

Modeling of Momentum Transfer to a Surface by Laser-Supported Absorption Waves

A re-examination of the laser-supported combustion wave

Numerical simulation of laser-supported combustion wave induced by millisecond-pulsed laser on aluminum alloy

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