High Mach number, high pressure recovery COIL nozzle aerodynamic experiments

Yang, Tiankai; Dickerson, R. A.; Moon, L. F.; Hsia, Y.

doi:10.2514/6.2000-2425

Cited by 10 publications

(8 citation statements)

References 10 publications

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“…Note that the difference between the start pressure and the unstart pressure was very small in the case of the trip-jets, while a difference of over 20 Torr was observed in the case of the tabs. 3) The recovered pressure of 80 Torr corresponds to the diffuser efficiency of approximately 70%, which is higher than in the case of conventional COIL (30 -40%). 9,10) There is an empirical formula of diffuser efficiency as a function of Reynolds number: D % 0:00272Re 1=2 .…”

Section: Cold-flow Testsmentioning

confidence: 90%

“…In order to increase the nitrogen stagnation pressure, Yang et al used a strategy whereby their nozzle bank is based on two-dimensional slit nozzles, which can minimize the total pressure loss, with mixing enhancement tabs mounted at the nozzle exit plane (NEP). 3) The stagnation pressure for nitrogen is approximately 7 atm, which enables a cavity Pitot pressure of 100 Torr at an oxygen dilution ratio of only 5. Hurlock showed that since iodine is premixed with the high-pressure nitrogen flow, this nozzle concept requires a high-pressure iodine supply system.…”

Section: Introductionmentioning

confidence: 99%

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Ejector Chemical Oxygen–Iodine Laser with Supersonic Nozzle Bank Based on a Trip-Jet Mixing System

Tei

Horioka

Nakajima

et al. 2008

jjap

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Motivated by application to quantum physics, anticommuting analogues of Wiener measure and Brownian motion are constructed. The corresponding Itô integrals are defined and the existence and uniqueness of solutions to a class of stochastic differential equations is established. This machinery is used to provide a Feynman-Kac formula for a class of Hamiltonians. Several specific examples are considered.

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Section: Cold-flow Testsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Ejector Chemical Oxygen–Iodine Laser with Supersonic Nozzle Bank Based on a Trip-Jet Mixing System

Tei

Horioka

Nakajima

et al. 2008

jjap

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“…Therefore, high diffuser efficiency is not expected [6]. We are now exploring 'Ejector-COIL' which can deliver high-pressure recovery [7,8].…”

Section: High Presure Supersonic Coilmentioning

confidence: 96%

Technical progress in industrial COIL

Tei¹,

Sugimoto²,

Ito³

et al. 2005

SPIE Proceedings

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Chemical oxygen-iodine laser (COIL) has a great potential for applications such as decommissioning and dismantlement (D&D) of nuclear reactor, rock destruction and removal and extraction of a natural resource (Methane hydrate) because of the unique characteristics such as power scalability, high optical beam quality and optical fiber beam. Five-kilowatt Chemical oxygen-iodine laser (COIL) test facility has been developed. The chemical efficiency of 27% has been demonstrated with a moderate beam quality for optical fiber coupling. Our research program contains conventional/ejector-COIL scheme, Jet-SOG/Mist-SOG optimization, fiber delivery and long-term operation.

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“…The second type of simulation is a full Navier-Stokes equation model with no or limited chemical equations [8,9]. The recent evolution of the performance of personal computers makes the use of three-dimensional full Navier-Stokes computational fluid dynamics (CFD) on them practical.…”

mentioning

confidence: 99%

Development of Hybrid Simulation for Supersonic Chemical Oxygen-Iodine Laser

2007

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A numerical simulation method for a supersonic chemical oxygen-iodine laser is developed. The model is a combination of a three-dimensional computational fluid dynamics code without kinetics and a detailed onedimensional, multiple-leaky-stream-tubes kinetics code. In the proposed method, the detailed flowfield characteristic is calculated by solving a full Navier-Stokes equation that does not involve chemical reactions, and the resultant temperature, velocity, and mixing characteristics are input to the kinetics code as its boundary conditions. A "nonuniform coefficient" is introduced to transform the fluid-dynamic mixing to the diffusive mixing term of the kinetics code. As a result, precise predictions of the gain distribution and laser output are given with a reasonable computational cost. The developed model is applied to the X-wing-type supersonic mixing chemical oxygen-iodine laser, which we have developed, and the calculated gain and output power are compared with the experimental results. The excellent agreements of calculated and experimental results show the validity of the developed method. Nomenclature C 2 g = rate constant of the gth second order reaction C 3 h = rate constant of the hth third order reaction D a = artificial diffusion coefficient k = fitting parameter of the artificial diffusion constant M i = number density of the ith species n = number of primary flow layers and secondary flow layers n p = photon density P = optical power T = temperature of the active medium v = gas velocity x = coordinate lateral to the main flow (parallel to the optical axis) y = vertical coordinate z = coordinate to the main-flow direction = nonuniform coefficient I = iodine molar fraction

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High Mach number, high pressure recovery COIL nozzle aerodynamic experiments

Cited by 10 publications

References 10 publications

Ejector Chemical Oxygen–Iodine Laser with Supersonic Nozzle Bank Based on a Trip-Jet Mixing System

Ejector Chemical Oxygen–Iodine Laser with Supersonic Nozzle Bank Based on a Trip-Jet Mixing System

Technical progress in industrial COIL

Development of Hybrid Simulation for Supersonic Chemical Oxygen-Iodine Laser

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