Preliminary estimates of the fate of SST exhaust materials using a coupled diffusion/chemistry model

Hilst, G. R.; Donaldson, Coleman duP.

doi:10.2514/6.1973-535

Cited by 5 publications

(3 citation statements)

References 2 publications

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“…l ' In Particular Lilly (cited in Ref. 4).suggests D = 2xlO~5 m 2 /sec 3 and Hilst(5) suggests K y = 10 m 2 /sec and Kz = 0.1 m 2 /sec. This value of Ky removes the contributions of "meandering," i.e., turbulence of a scale greater than the width of the plume.…”

Section: Resultsmentioning

confidence: 99%

“…At downstream distances where p = p n and (Ujj -Ua,) « u,,,, Equations (1) and (4) provide the following relation between the half-value width and the centerline concentration difference ratio, P» U (5) where c c is the concentration on the centerline at any downstream location. In this region the asymptotic result for a small excess jet is obtained , namely…”

Section: Introductionmentioning

confidence: 99%

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Dispersion and dilution of jet aircraft exhaust at high-altitude flight conditions

Holdeman

1974

12th Aerospace Sciences Meeting

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A method is presented for estimating the dispersion and dilution of jet aircraft exhaust from aircraft passage through times on the order of weeks thereafter. In the near wake of the aircraft, the solution is that for round turbulent jets in a parallel flow. More rapid dispersion due to atmospheric effects begins when the scale-dependent eddy viscosity becomes larger than the turbulent jet eddy viscosity. In the far wake region, the solution approaches that for scale-dependent dispersion from a point source moving with the aircraft. Calculations are presented for supersonic aircraft at high-altitude flight conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dispersion and dilution of jet aircraft exhaust at high-altitude flight conditions

Holdeman

1974

12th Aerospace Sciences Meeting

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“…3 For the fraction of the effluent's residence time in the stratosphere that this model is correct, the NO in the inner portion of the wake is ineffective in removing ozone from the surrounding atmosphere. Reduced ozone within the wake may be an important and sensitive indication of the NO wake concentration, since this model predicts that as long as the wake diffusion is not complete the interior of the wake will be essentially free of ozone.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Laser Measurement of High-Altitude Aircraft Emissions

Brockman

Seals

1974

AIAA Journal

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Accurate prediction of the environmental impact of stratospheric aircraft operation requires highly sensitive and specific measurement of effluents which have long residence times and possible catalytic interactions with the ambient atmosphere. Calculations have been performed to analyze three narrow bandwidth tunable laser measurement techniques for high altitudes where molecular absorption lines are narrow. Two ended absorption measurements using state-of-the-art tunable infrared diode lasers can provide sensitivities of ^ 0.02-0.2 ppm over 10 m for O 3 , CO, NO, H 2 O, and SO 2 with minimal interference effects. Heterodyne radiometry of radiation from a hot near wake is capable of measuring initial wake concentrations, while heterodyne radiometry of absorption of solar radiation is sensitive to < 0.01 ppm of NO and CO in the far wake. These heterodyne measurements, with tunable diode laser local oscillators, will require development of milliwatt per mode diode lasers. Remote (1 km) resonance fluorescence measurements using dye lasers are capable of measuring to 0.15 ppm NO 2 . Sensitivities can be improved to close to ambient levels during wake penetration.

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