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Structure and mixing of a transient flow of helium injected into an established flow of nitrogen: two dimensional measurement and simulation.

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Názov: Structure and mixing of a transient flow of helium injected into an established flow of nitrogen: two dimensional measurement and simulation.
Autori: C. Tseng, D. Voytovych, W. Kulatilaka, A. Bhuiyan, R. Lucht, C. Merkle, J. Hulka, G. Jones
Zdroj: Experiments in Fluids; Apr2009, Vol. 46 Issue 4, p559-575, 17p
Predmety: UNSTEADY flow (Aerodynamics), HELIUM, NITROGEN, GAS flow, ATMOSPHERIC pressure, PHYSICS experiments, SIMULATION methods & models
Abstrakt: Abstract  The transient injection and mixing between nitrogen and helium in a confined chamber at atmospheric pressure is studied experimentally. The 2D injector and mixing chamber contained a middle injection slot for nitrogen flanked by a pair of outer slots for helium. Experiments were conducted by introducing the helium streams into a previously established quasi-steady flow of nitrogen. The nitrogen stream was seeded with nitric oxide (NO) that served as a source for quantitative, planar laser-induced fluorescence (PLIF) imaging of the transient mixing process. PLIF images were acquired by triggering an Nd:YAG laser system at selected times following helium valve actuation. The observed flow structures and extent of mixing between the two streams proved to be highly unsteady and irregular with the helium/nitrogen jets frequently deviating from the centerline toward the confining walls. Representative unsteady CFD solutions also show this same absence of symmetry and the same general flow structures as the measurements, however, they predict somewhat higher helium concentration in recirculation regions than were observed in the measurements. [ABSTRACT FROM AUTHOR]
Copyright of Experiments in Fluids is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Structure and mixing of a transient flow of helium injected into an established flow of nitrogen: two dimensional measurement and simulation.
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  Data: Experiments in Fluids; Apr2009, Vol. 46 Issue 4, p559-575, 17p
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  Data: <searchLink fieldCode="DE" term="%22UNSTEADY+flow+%28Aerodynamics%29%22">UNSTEADY flow (Aerodynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22HELIUM%22">HELIUM</searchLink><br /><searchLink fieldCode="DE" term="%22NITROGEN%22">NITROGEN</searchLink><br /><searchLink fieldCode="DE" term="%22GAS+flow%22">GAS flow</searchLink><br /><searchLink fieldCode="DE" term="%22ATMOSPHERIC+pressure%22">ATMOSPHERIC pressure</searchLink><br /><searchLink fieldCode="DE" term="%22PHYSICS+experiments%22">PHYSICS experiments</searchLink><br /><searchLink fieldCode="DE" term="%22SIMULATION+methods+%26+models%22">SIMULATION methods & models</searchLink>
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  Data: Abstract  The transient injection and mixing between nitrogen and helium in a confined chamber at atmospheric pressure is studied experimentally. The 2D injector and mixing chamber contained a middle injection slot for nitrogen flanked by a pair of outer slots for helium. Experiments were conducted by introducing the helium streams into a previously established quasi-steady flow of nitrogen. The nitrogen stream was seeded with nitric oxide (NO) that served as a source for quantitative, planar laser-induced fluorescence (PLIF) imaging of the transient mixing process. PLIF images were acquired by triggering an Nd:YAG laser system at selected times following helium valve actuation. The observed flow structures and extent of mixing between the two streams proved to be highly unsteady and irregular with the helium/nitrogen jets frequently deviating from the centerline toward the confining walls. Representative unsteady CFD solutions also show this same absence of symmetry and the same general flow structures as the measurements, however, they predict somewhat higher helium concentration in recirculation regions than were observed in the measurements. [ABSTRACT FROM AUTHOR]
– Name: Abstract
  Label:
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  Data: <i>Copyright of Experiments in Fluids is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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