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Bücher Englische Bücher Wissen & Bildung Naturwissenschaft, Medizin, Informatik, Technik Technik Wärme-, Energie- und Kraftwerktechnik Numerical Study on Thermodiffusive Instabilities in Laminar and Turbulent Hydrogen Flames
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Numerical Study on Thermodiffusive Instabilities in Laminar and Turbulent Hydrogen Flames
Lukas Berger (Broschiert, Englisch)
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Beschreibung
The deployment of hydrogen represents a unique opportunity to decarbonize thermochemical energy conversion processes, but its utilization involves several scientific and technological challenges, e.g., lean hydrogen/air flames are prone to thermodiffusive instabilities. In this thesis, a series of direct numerical simulations (DNS) is performed to assess the impact of these instabilities on… hydrogen/air flames. Such instabilities are shown to have a leading order effect on the flame propagation, yielding consumption speeds several times higher than the laminar unstretched burning velocity. An analysis of the characteristic flame front corrugation in laminar flows reveals the existence of a smallest and largest flame intrinsic length scale, whose formation mechanisms are studied in detail. Theoretical models are shown to be not capable of accurately describing the evolution of such flames, so the propensity of laminar lean hydrogen flames to develop thermodiffusive instabilities is studied at different equivalence ratios, unburned temperatures, and pressures. Further, to investigate the interactions of thermodiffusive instabilities and turbulence, large-scale DNS of turbulent lean hydrogen/air flames have been performed in a slot burner configuration. Thermodiffusive instabilities are shown to significantly affect the turbulent flame speed, which is not only enhanced by flame wrinkling, but is also greatly increased due to significant variations of the local reaction rates. The effects of differential diffusion are found to be even enhanced in a turbulent flame compared to a laminar flame at the same conditions. Thus, thermodiffusive instabilities are sustained in turbulent flows and even show synergistic interactions with turbulence. Dieses Produkt haben wir gerade leider nicht auf Lager.
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Technische Daten
Erscheinungsdatum
27.07.2022
Sprache
Englisch
EAN
9783844087130
Herausgeber
Shaker
Serien- oder Bandtitel
Berichte aus der Energietechnik
Sonderedition
Nein
Autor
Lukas Berger
Seitenanzahl
192
Auflage
1
Einbandart
Broschiert
-.-
★★★★★
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