A comparative study of turbulent premixed flames propagating past repeated obstacles / A. R. Masri in Industrial & engineering chemistry research, Vol. 51 N° 22 (Juin 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp.7690–7703 Titre : A comparative study of turbulent premixed flames propagating past repeated obstacles Type de document : texte imprimé Auteurs : A. R. Masri, Auteur ; A. AlHarbi, Auteur ; S. Meares, Auteur Année de publication : 2012 Article en page(s) : pp.7690–7703 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Turbulent Flames Résumé : This paper presents a comparison of the overpressures and pressure gradients obtained in turbulent premixed flames of liquified petroleum gas (LPG), compressed natural gas (CNG), and hydrogen propagating past solid obstacles. The fuel-air mixture is initially at rest and is ignited at the base of a vented chamber. For each fuel a total of eighteen configurations are studied here with various permutations of three baffles plates and an obstacle with a square cross section providing a blockage ratio of either 0.24 or 0.5. High speed laser induced fluorescence from OH (LIF-OH) imaging is also performed at a repetition rate of 5kHz providing new measurements of the evolution of the flame front along the middle section of the chamber. It is found that for all fuels the peak pressure as well as the rate change of pressure increases not only with increasing blockage ratio induced by the increasing blockage ratio, but also with decreasing separation between successive baffles. The peak pressure and its rate of change in hydrogen flames are over an order of magnitude higher than those obtained in LPG and CNG fuels. High speed images of LIF-OH show that the degree of wrinkling and contortion in the flame front also increases significantly with increasing blockages. It is evident from the LIF-OH images that the flame front relaminarises as the separation between successive obstacles increase hence explaining the pressure decrease with increasing separation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201928g [article] A comparative study of turbulent premixed flames propagating past repeated obstacles [texte imprimé] / A. R. Masri, Auteur ; A. AlHarbi, Auteur ; S. Meares, Auteur . - 2012 . - pp.7690–7703. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp.7690–7703 Mots-clés : Turbulent Flames Résumé : This paper presents a comparison of the overpressures and pressure gradients obtained in turbulent premixed flames of liquified petroleum gas (LPG), compressed natural gas (CNG), and hydrogen propagating past solid obstacles. The fuel-air mixture is initially at rest and is ignited at the base of a vented chamber. For each fuel a total of eighteen configurations are studied here with various permutations of three baffles plates and an obstacle with a square cross section providing a blockage ratio of either 0.24 or 0.5. High speed laser induced fluorescence from OH (LIF-OH) imaging is also performed at a repetition rate of 5kHz providing new measurements of the evolution of the flame front along the middle section of the chamber. It is found that for all fuels the peak pressure as well as the rate change of pressure increases not only with increasing blockage ratio induced by the increasing blockage ratio, but also with decreasing separation between successive baffles. The peak pressure and its rate of change in hydrogen flames are over an order of magnitude higher than those obtained in LPG and CNG fuels. High speed images of LIF-OH show that the degree of wrinkling and contortion in the flame front also increases significantly with increasing blockages. It is evident from the LIF-OH images that the flame front relaminarises as the separation between successive obstacles increase hence explaining the pressure decrease with increasing separation. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201928g

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