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Experimental observations on the influence of hydrogen atoms diffusion on laminar and turbulent premixed burning velocities.

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Title: Experimental observations on the influence of hydrogen atoms diffusion on laminar and turbulent premixed burning velocities.
Authors: Burluka, A.A.1, Gaughan, R.G.2, Griffiths, J.F.3, Mandilas, C.1 mandilas@cperi.certh.gr, Sheppard, C.G.W.1, Woolley, R.4
Source: Fuel (0016-2361). Feb2017, Vol. 189, p66-78. 13p.
Subjects: Hydrogen atom, Isotopes, Flame, Laminar flow, Burning velocity, Temperature effect, Deuterium
Abstract: Measurements of the laminar and turbulent burning velocity of premixed hydrogen–air, n -hexane–air and n -octane–air flames were made and compared to corresponding measurements of deuterium–air, n -hexane-d14–air and n -octane-d18–air flames performed at identical initial conditions. Experiments were conducted in a constant volume, optically accessed vessel, at elevated initial pressure and temperature of 0.5 MPa and 360 K, for a range of equivalence ratios. Burn rate data was determined via schlieren imaging of flames. It was found that the isotope effect accounted for an average reduction of 20% in the laminar burn rate of alkanes. Similarly, deuterium was measured to burn around 30% slower than hydrogen at the range of equivalence ratios explored. The isotope effect on burn rate was significantly reduced under turbulence. The difference between the turbulent burn rates of the deuterated alkanes and their normal alkane counterparts were measured to be approximately 10%. The difference between the turbulent burn rates of deuterium and hydrogen was even smaller. Nonetheless, the laminar burn rate ranking was maintained under turbulence for all fuels and conditions explored, thus suggesting a degree of influence of radical transport and chemistry under turbulent burning. [ABSTRACT FROM AUTHOR]
Copyright of Fuel (0016-2361) is the property of Elsevier B.V. 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 119371550
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Experimental observations on the influence of hydrogen atoms diffusion on laminar and turbulent premixed burning velocities.
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  Data: <searchLink fieldCode="JN" term="%22Fuel+%280016-2361%29%22">Fuel (0016-2361)</searchLink>. Feb2017, Vol. 189, p66-78. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Hydrogen+atom%22">Hydrogen atom</searchLink><br /><searchLink fieldCode="DE" term="%22Isotopes%22">Isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Flame%22">Flame</searchLink><br /><searchLink fieldCode="DE" term="%22Laminar+flow%22">Laminar flow</searchLink><br /><searchLink fieldCode="DE" term="%22Burning+velocity%22">Burning velocity</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature+effect%22">Temperature effect</searchLink><br /><searchLink fieldCode="DE" term="%22Deuterium%22">Deuterium</searchLink>
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  Data: Measurements of the laminar and turbulent burning velocity of premixed hydrogen–air, n -hexane–air and n -octane–air flames were made and compared to corresponding measurements of deuterium–air, n -hexane-d14–air and n -octane-d18–air flames performed at identical initial conditions. Experiments were conducted in a constant volume, optically accessed vessel, at elevated initial pressure and temperature of 0.5 MPa and 360 K, for a range of equivalence ratios. Burn rate data was determined via schlieren imaging of flames. It was found that the isotope effect accounted for an average reduction of 20% in the laminar burn rate of alkanes. Similarly, deuterium was measured to burn around 30% slower than hydrogen at the range of equivalence ratios explored. The isotope effect on burn rate was significantly reduced under turbulence. The difference between the turbulent burn rates of the deuterated alkanes and their normal alkane counterparts were measured to be approximately 10%. The difference between the turbulent burn rates of deuterium and hydrogen was even smaller. Nonetheless, the laminar burn rate ranking was maintained under turbulence for all fuels and conditions explored, thus suggesting a degree of influence of radical transport and chemistry under turbulent burning. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Fuel (0016-2361) is the property of Elsevier B.V. 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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      – Type: doi
        Value: 10.1016/j.fuel.2016.10.088
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      – Code: eng
        Text: English
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        PageCount: 13
        StartPage: 66
    Subjects:
      – SubjectFull: Hydrogen atom
        Type: general
      – SubjectFull: Isotopes
        Type: general
      – SubjectFull: Flame
        Type: general
      – SubjectFull: Laminar flow
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      – SubjectFull: Burning velocity
        Type: general
      – SubjectFull: Temperature effect
        Type: general
      – SubjectFull: Deuterium
        Type: general
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      – TitleFull: Experimental observations on the influence of hydrogen atoms diffusion on laminar and turbulent premixed burning velocities.
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              Text: Feb2017
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              Y: 2017
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