Chemical oxygen iodine laser (COIL) beam quality predictions using 3-D Navier-Stokes (MINT) and wave optics (OCELOT) codes

Lampson, Alan; Plummer, David N.; Erkkila, John H.; Crowell, Peter G.; Helms, Charles A.

doi:10.2514/6.1998-2991

Cited by 9 publications

(11 citation statements)

References 1 publication

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“…The results [11,12] do not show any mixing and nozzle tail flow effect imprints on the flow or optical fields as seen in [8,9] ; perhaps the grid is not fine enough to resolve them.…”

Section: Introductionmentioning

confidence: 94%

“…In order to simulate the entire resonator, the gain/intensity sheet concept [8] is adopted (see Figure 5). In order to simulate the cavity flow field more accurately, each gain/intensity sheet is corresponding to a 3D macroscale flow calculation over domain H × W. The influence of the intensity variation in the optical axis direction is incorporated in the gain sheet model where the fluid dynamics calculation between each set of nozzle blades is assumed to be independent of the adjacent blades (i.e., the intensity field varies 'slowly' over the distance W between blades).…”

Section: Methodology Of Laser Performance Simulationmentioning

confidence: 99%

“…To set the inflow boundary conditions exactly, two scale calculations are performed [8] (see Figure 3). The microscale calculation includes the influence of the injector holes array and shock waves from the nozzle blades but ignores the presence of the nozzle endwall.…”

Section: Inflow Boundary Conditions For Resonator Flow Calculationsmentioning

confidence: 99%

“…Although these studies have shown reasonable comparisons with measured gain, power and dissociation data [7][8][9][10][11][12] , they have provided incomplete insight into some of the fluid dynamic effects within COIL flow fields.…”

Section: Introductionmentioning

confidence: 99%

“…Lampson et al [8,9] investigated laser beam quality issues with 3D Navier-Stokes (MINT) and wave optics (OCELOT) codes. The premixed flow assumption was used in the cavity flow field simulation coupling with wave optics over a macroscale domain, and the iodine dissociation rate constant was increased to match the nozzle exit plant dissociation fraction [8,9] .…”

Section: Introductionmentioning

confidence: 99%

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The proposal and realization on more exact modeling of COIL performance

Shu

et al. 2013

High Pow Laser Sci Eng

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The chemical oxygen-iodine laser (COIL) is the shortest-wavelength high-power chemical laser that has been demonstrated. The characteristics, such as good atmospheric propagation, short wavelength and excellent transmission through optical fibers, make the COIL a good candidate for high-power laser application. To model the complete COIL lasing interaction, a three-dimensional formulation of the fluid dynamics, species continuity and radiation transport equations is necessary. The computational effort to calculate the flow field over the entire nozzle bank with a grid fine enough to resolve the injection holes is so large as to preclude doing the calculation. The approach to modeling chemical lasers then has been to reduce the complexity of the model to correspond to the available computational capability, adding details as computing power increased. The modeling of lasing in the COIL medium is proposed, which is coupling with the effects induced by transverse injection of secondary gases, non-equilibrium chemical reactions, nozzle tail flow and boundary layer. The coupled steady solutions of the fluid dynamics and optics in a COIL complex three-dimensional cavity flow field are obtained following the proposal. The modeling results show that these effects have some influence on the lasing properties. A feasible methodology and a theoretical tool are offered to predict the beam quality for large-scale COIL devices.

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“…The results [11,12] do not show any mixing and nozzle tail flow effect imprints on the flow or optical fields as seen in [8,9] ; perhaps the grid is not fine enough to resolve them.…”

Section: Introductionmentioning

confidence: 94%

Section: Methodology Of Laser Performance Simulationmentioning

confidence: 99%

Section: Inflow Boundary Conditions For Resonator Flow Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The proposal and realization on more exact modeling of COIL performance

Shu

et al. 2013

High Pow Laser Sci Eng

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Active Iodine Inlet Control for Improving the Nearfield Intensity Uniformity of COIL

Jia

Sang

et al. 2012

2012 Symposium on Photonics and Optoelectronics

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More exact modeling of COIL laser performance

Shu

et al. 2012

SPIE Proceedings

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The chemical oxygen-iodine laser (COIL) is the shortest wavelength and high-power chemical laser demonstrated. To model the complete COIL lasing interaction, a three-dimensional formulation of the fluid dynamics, species continuity and radiation transport equations is necessary. The computational effort to calculate the flow field over the entire nozzle bank with a grid fine enough to resolve the injection holes is so large as to preclude doing the calculation. The approach to modeling chemical lasers then has been to reduce the complexity of the model to correspond to the available computational capability, adding details as computing power increased. The modeling of lasing in COIL is proposed, which is coupling with the effects induced by transverse injection of secondary gases, non-equilibrium chemical reactions, nozzle tail flow and boundary layer. The coupled steady solutions of the fluid dynamics and optics in a COIL complex three dimensional cavity flow field are obtained following the proposal. The modeling results show that these effects have some influence on the lasing properties. A feasible methodology and a theoretical tool are offered to predict the beam quality for the large scale COIL devices.

show abstract

Chemical oxygen iodine laser (COIL) beam quality predictions using 3-D Navier-Stokes (MINT) and wave optics (OCELOT) codes

Cited by 9 publications

References 1 publication

The proposal and realization on more exact modeling of COIL performance

The proposal and realization on more exact modeling of COIL performance

Active Iodine Inlet Control for Improving the Nearfield Intensity Uniformity of COIL

More exact modeling of COIL laser performance

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