Sökning: "flame acceleration"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden flame acceleration.

  1. 1. Turbulent burning, flame acceleration, explosion triggering

    Författare :V'yacheslav Akkerman; Vitaly Bychkov; Geoffrey Searby; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Turbulent combustion; flame acceleration; detonation explosion triggering; direct numerical simulations; Physics; Fysik;

    Sammanfattning : The present thesis considers several important problems of combustion theory, which are closely related to each other: turbulent burning, flame interaction with walls in different geometries, flame acceleration and detonation triggering. The theory of turbulent burning is developed within the renormalization approach. LÄS MER

  3. 2. Numerical study of flame dynamics

    Författare :Arkady Petchenko; Vitaly Bychkov; Leonid Kagan; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; combustion; Direct Numerical Simulation DNS ; turbulence; flame-vortex interaction; flame acceleration; flame-acoustic interaction; Physics; Fysik;

    Sammanfattning : Modern industrial society is based on combustion with ever increasing standards on the efficiency of burning. One of the main combustion characteristics is the burning rate, which is influenced by intrinsic flame instabilities, external turbulence and flame interaction with walls of combustor and sound waves. LÄS MER

  4. 3. Flame Dynamics and Deflagration-to-Detonation Transition

    Författare :Damir Valiev; Börje Johansson; R. J. M. (Rob) Bastiaans; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; flame; premixed; instability; fractal; deflagration; detonation; DDT; simulation; Physics; Fysik;

    Sammanfattning : Various premixed flame phenomena are studied by means of direct numerical simulations of the complete system of hydrodynamic equations. Rigorous study of flame dynamics is essential for all premixed combustion problems where multidimensional effects cannot be disregarded.The present thesis consists of six parts. LÄS MER

  5. 4. The role of Landau-Darrieus instability in flame dynamics and deflagration-to-detonation transition

    Författare :Damir Valiev; Börje Johansson; Vladimir Karlin; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; flame; premixed; instability; front; Landau; Darrieus; fractal; freely; deflagration; detonation; transition; DDT; modeling; simulation; Other materials science; Övrig teknisk materialvetenskap;

    Sammanfattning : The role of intrinsic hydrodynamic instability of the premixed flame (known as Landau-Darrieus instability) in various flame phenomena is studied by means of direct numerical simulations of the complete system of hydrodynamic equations. Rigorous study of flame dynamics and effect of Landau-Darrieus instability is essential for all premixed combustion problems where multidimensional effects cannot be disregarded. LÄS MER

  7. 5. Turbulent premixed flames in a model gas turbine combustor: fuel sensitivity and flame dynamics

    Författare :Francesco Pignatelli; Strömningsteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fuel flexibility; Premixed turbulent combustion; DNS; Optical diagnostic;

    Sammanfattning : The demand for energy security and reduction of greenhouse gas emissions has led to a surge of interest in the development of high-efficiency and low-emission gas turbine engines that can run on alternative low carbon content fuels, such as hydrogen-enriched fuel and syngas. However, the combustion characteristics of these fuels can significantly alter the flame characteristics and operability range of existing combustors. LÄS MER