Three-dimensional (3-D) Navier-Stokes analysis of the mixing and power extraction in a supersonic chemical oxygen iodine laser (COIL) with transverse I2 injection

Buggeln, R. C.; Shamroth, S. J.; Lampson, Alan; Crowell, Peter G.

doi:10.2514/6.1994-2435

Cited by 24 publications

(12 citation statements)

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“…The laser system analyzed in this paper is a Roto COILlike laser [7] . A lot of supersonic nozzle blades are used (see Figures 1 and 2 As the flow travels in a constant area section toward the nozzle throat, a sonic secondary mixture of I 2 and He is injected normal to the flow through a lot of orifices from the nozzle blades' walls, shown in Figure 2.…”

Section: Modeling Approachmentioning

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%

“…Buggeln et al [7] coupled the Fabry-Perot resonator model with the three-dimensional (3D) Navier-Stokes equations and modeled the region from the injectors to the cavity where the power extraction occurs over a microscale domain. Lampson et al [8,9] investigated laser beam quality issues with 3D Navier-Stokes (MINT) and wave optics (OCELOT) codes.…”

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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Section: Modeling Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…Since the fuel is injected downstream of the throat in supersonic COIL, flow velocity increases and the partial pressure of singlet delta oxygen is reduced, both of which reduce the rate of oxygen loss. Several designs for supersonic COIL lasers have been described in the open literature [5,6,7,8,9,10,11]. In all cases, mixing of the fuel with carrier into the primary flow is crucial to chemical laser design.…”

Section: Overview Of Validation Problemsmentioning

confidence: 99%

“…Our simulations involve two species (air and SF 6 for the first problem, air and helium for the second), and the flow is considered to be compressible and non-reacting. As mentioned above, we use a commercial CFD solver GASP that solves the Navier-Stokes equations with a cell-centered finite volume method.…”

Section: Numerical Formulationmentioning

confidence: 99%

Prediction of Chemical Laser Flow

Vorobieff¹,

Truman²

2006

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Executive summaryThe scope of the work as proposed to the funding agency was to carry out numerical calculations of high-speed mixing flows using GASP, a computational fluid dynamics (CFD) code. The ultimate goal is to use GASP for prediction and optimization of chemical laser flows. To do it, one must have confidence in the performance of the hydrodynamic and mixing part of the code.For complex numerical simulations, it is essential to perform code validation -a quantitative comparison of numerical results with experimental results confirming that the code faithfully reproduces the physics of the real problem. Two detailed validation exercises were performed with GASP:" Simulation of a shock-accelerated mixing flow. This validation exercise compared the numerical results produced by GASP with highly-resolved experimental data on flows subject to Richtmyer-Meshkov instability (RMI), the preferred test problem for quantitative assessment of the performance of CFD codes in prediction of the properties of high-speed mixing flows. The validation problem revealed that GASP can faithfully reproduce all the large-scale quantitative properties of the flow. We also gained important additional insights into the strengths and limitations of GASP (and other numerical codes) in prediction of disordered small scales in flows transitioning to turbulence." General jet-in-crossflow problem. The problem of a supersonic jet discharging into a supersonic crossflow presents a significant computational challenge, yet provides a valuable validation exercise when the results are compared with experimental data. The conditions for this exercise were chosen to achieve two goals: -Provide comparison with best experimental data available in open literature.-Test the code in a generic configuration that can be easily modified to represent a specific chemical laser nozzle injection scheme.The agreement with the experimental data was quite good, yet subtle features of the flow that were not apparent in the experiment were revealed by the simulation.The results of our work are as follows."* We found the hydrodynamic model used in GASP to be suitable for prediction of mixing in chemical laser flows."* We found the error in prediction of the geometry of large-scale features (e.g., counter-rotating vortex pairs) not to exceed 10-15% when compared with experiment.

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Three-dimensional Computational Analysis of Transverse Injection in a Supersonic Combustor

Karthikeyan¹,

Kumar²,

Yuvaraj³

et al. 2021

IOP Conf. Ser.: Mater. Sci. Eng.

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The scramjet engine plays a promising role for a successful future hypersonic flight system. The performance of scramjet system depends on many factors like mixing rate of fuel and air, proper flame stabilization mechanism and suitable injection system. The flame stabilization is provided by means of introducing a Cavity along the wall of the combustor. The cavity effects on the performance of supersonic combustion will be studied here with the help of three-dimensional combustor CFD model. The reliability of the numerical results obtained by using the computational approach depends on the proper validation of the CFD code with their corresponding experimental results. The corresponding experimental results from the literature will be identified and used here for the validation of the numerical code. The final CFD results after its validation with the experimental results will be presented in terms of x-y plots and contours for the discussion.

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Three-dimensional (3-D) Navier-Stokes analysis of the mixing and power extraction in a supersonic chemical oxygen iodine laser (COIL) with transverse I2 injection

Cited by 24 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

Prediction of Chemical Laser Flow

Three-dimensional Computational Analysis of Transverse Injection in a Supersonic Combustor

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