Search for dissertations about: "flame"

Showing result 1 - 5 of 326 swedish dissertations containing the word flame.

  1. 1. Numerical study of flame dynamics

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

    Abstract : 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. READ MORE

  2. 2. Flame Dynamics and Deflagration-to-Detonation Transition

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

    Abstract : 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. READ MORE

  3. 3. Experimental and Numerical Investigations of Flames Stabilized by Swirl Flow and Bluff-body:Flame Structures and Flame Instabilities

    Author : Yiheng Tong; Kraftverksteknik; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Flame structures; Flame instabilities; Blowout limits; Flashback; Swirl Flow; Bluff-body; Chemiluminescence; PIV;

    Abstract : Combustion and its control are essential to our existence on this planet since we knew it. Nowadays, the largest share of the world’s electricity and most of our transportation systems are powered by combustion. In addition, industrial processes also rely heavily upon combustion. READ MORE

  4. 4. Theoretical and Experimental Investigations of Nonlinear Flame Instability

    Author : Li-Zheng Ma; Chalmers University of Technology; []
    Keywords : nonlinear hydrodynamic instability; flame propagation and stretch effects; shock induced flame instability; tulip flame formation; interface tracking; the Schlieren technique; level set approach;

    Abstract : Flame instability is both important and difficult to understand. Mechanisms of instability are complex, because instability often involves an interaction between several different physical phenomena, such as an unsteady chemical reaction, unsteady flame propagation generating an unsteady flow, acoustic waves or shock waves. READ MORE

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

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

    Abstract : 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. READ MORE