Characteristics of the gain medium for an ejector COIL with supersonic nozzles for the driver buffer gas

Загидуллин, М. В.; Николаев, В. Д.; Svistun, M I; Khvatov, N A; Hager, Gordon D.

doi:10.1007/s00339-005-3229-x

Cited by 8 publications

(3 citation statements)

References 9 publications

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“…It was found that the rate constant depends linearly on the temperature. The temperature dependence of the rate constant must be taken into account in order to convert LIF images into quantitative concentration maps in experiments with visualization of supersonic gas flows [2,3], where high temperature gradients are realized.…”

Section: Resultsmentioning

confidence: 99%

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Gas Flow Visualization Using Laser-induced Fluorescence

Загидуллин

Torbin

Чернышов

et al. 2015

Procedia Engineering

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Laser-induced fluorescence (LIF) is one of the methods for visualization of mixing and velocity field of supersonic flows. The method permits almost nonintrusive study of gas flow dynamics in jet engines with a high temporal and spatial resolution. The nature of supersonic flow implies large pressure, temperature and density gradients which might introduce considerable errors into the interpretation of the images, because LIF intensity strongly depends upon excited particle fluorescence decay lifetime in addition to its number density in the medium. An excited particle quenching rate usually depends on the local gas density and temperature. Therefore, for correct interpretation of the images it is necessary to know the temperature dependence of the quenching rate constants. In this work the method is developed to measure the temperature dependence of the quenching rate constant of the fluorescing particle using LIF.

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Section: Resultsmentioning

confidence: 99%

“…A number of particles exist which, if added to the flow and excited by a laser light, provide a sharp visualization pattern with good spatial and temporal resolution [1,2]. One of those particles is the iodine molecule, I 2 , which is conveniently observed using the B 3 (0 + )-X 1 + transition.…”

Section: Introductionmentioning

confidence: 99%

Gas Flow Visualization Using Laser-induced Fluorescence

Загидуллин

Torbin

Чернышов

et al. 2015

Procedia Engineering

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“…The gain was given by σ ([I * ] − 0.5[I]) where σ is the stimulated emission cross-section. At pressures of less than tens of Torr, Doppler broadening dominates over pressure broadening, and so the stimulated emission cross-section can be approximated by [35],…”

Section: Consequences Of No In the Inlet Flowmentioning

confidence: 99%

O₂(¹Δ) production and gain in plasma pumped oxygen–iodine lasers: consequences of NO and NO₂additives

Arakoni¹,

Babaeva²,

Kushner³

2007

J. Phys. D: Appl. Phys.

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The 1.315 µm [I(2P1/2) → I(2P3/2)] transition of atomic iodine in the chemical oxygen–iodine laser (COIL) is pumped by sequential reactions of I2 and I with O2(1Δ). In electrically pumped systems (eCOILs), electron impact excitation of O2 produces the O2(1Δ) and also produces O atoms through dissociative excitation. The O atoms, through reactions with I2, I(2P1/2) and I(2P3/2), lead to dissociation of I2, quenching of the upper laser level and removal of the lower laser level. While dissociating I2 is potentially beneficial, quenching of the upper laser level is detrimental and so management of the O atom density is necessary to maximize laser gain. In this regard, NO and NO2 additives have been used to manage the O atom density by cyclically reacting with O and I. In this paper, results from a computational investigation of eCOIL systems using plug flow and two-dimensional models are discussed where NO and NO2 additives are used. The system is a flowing plasma sustained in He/O2/NO mixtures with downstream injection of NO2 followed by injection of I2. We found that addition of NO and NO2 is effective in managing the density of O atoms and maximizing gain by minimizing quenching of the upper laser level. We found that by optimizing the additives, laser gain can be maximized even though O2(1Δ) densities may be lower due to the management of quenching and dissociation reactions.

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An experimental research on the mixing process of supersonic oxygen–iodine parallel streams

Wang

Sang

Zhang

et al. 2014

Optics & Laser Technology

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Characteristics of the gain medium for an ejector COIL with supersonic nozzles for the driver buffer gas

Cited by 8 publications

References 9 publications

Gas Flow Visualization Using Laser-induced Fluorescence

Gas Flow Visualization Using Laser-induced Fluorescence

O₂(¹Δ) production and gain in plasma pumped oxygen–iodine lasers: consequences of NO and NO₂additives

An experimental research on the mixing process of supersonic oxygen–iodine parallel streams

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Characteristics of the gain medium for an ejector COIL with supersonic nozzles for the driver buffer gas

Cited by 8 publications

References 9 publications

Gas Flow Visualization Using Laser-induced Fluorescence

Gas Flow Visualization Using Laser-induced Fluorescence

O2(1Δ) production and gain in plasma pumped oxygen–iodine lasers: consequences of NO and NO2additives

An experimental research on the mixing process of supersonic oxygen–iodine parallel streams

Contact Info

Product

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O₂(¹Δ) production and gain in plasma pumped oxygen–iodine lasers: consequences of NO and NO₂additives