Sökning: "premixed flames"

Visar resultat 1 - 5 av 56 avhandlingar innehållade orden premixed flames.

  1. 1. Laser Diagnostics Applied to Lean Premixed Swirling Flames - Simultaneous Flow Field and Scalar Measurements

    Detta är en avhandling från Division of Combustion Physics, Department of Physics, Lund University

    Författare :Per Petersson; [2014]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Volumetric Velocimetry; Low-swirl Flames; Premixed Flames; Turbulent Combustion; Particle Image Velocimetry; Laser Diagnostics; A.2014:Petersson; Combustion Diagnostics;

    Sammanfattning : The work reported here includes experimental studies of lean premixed swirling flames. Various laser-based optical diagnostic techniques were used to collect information under different operational conditions. Combined flow- and scalar field measurements were performed at high repetition rates for detailed studies of the turbulent flames. LÄS MER

  2. 2. Wall Related Lean Premixed Combustion Modeled with Complex Chemistry

    Detta är en avhandling från Stockholm : Kemiteknik

    Författare :Johan Andrae; [2002]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wall effects; premixed flames; flame quenching; numerical modeling; chemkin; boundary layer approximation; gasified biomass; fuel-NOx; hybrid catalytic combustor.; NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : Increased knowledge into the physics and chemistrycontrolling emissions from flame-surface interactions shouldhelp in the design of combustion engines featuring improvedfuel economy and reduced emissions.The overall aim of this work has been to obtain afundamental understanding of wall-related, premixed combustionusing numerical modeling with detailed chemical kinetics. LÄS MER

  3. 3. Numerical Studies of Wall Effects of Laminar Flames

    Detta är en avhandling från Stockholm : Kemiteknik

    Författare :Johan Andrae; [2001]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wall effects; laminar premixed flames; Chemkin; boundary layer flow; TECHNOLOGY Chemical engineering; TEKNIKVETENSKAP Kemiteknik;

    Sammanfattning : Numerical simulations have been done with the CHEMKINsoftware to study different aspects of wall effects in thecombustion of lean, laminar and premixed flames in anaxisymmetric boundary-layer flow.The importance of the chemical wall effects compared to thethermal wall effects caused by the development of the thermaland velocity boundary layer has been investigated in thereaction zone by using different wall boundary conditions, walltemperatures and fuel/air ratios. LÄS MER

  4. 4. Direct numerical simulation of turbulent premixed flames at high Karlovitz numbers: structure and modelling

    Detta är en avhandling från Department of Energy Sciences, Lund University

    Författare :Thommie Nilsson; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Direct numerical simulation; Computational fluid dynamics; Combustion model; Premixed flame; Turbulence; Karlovitz number;

    Sammanfattning : There has been recent increased interest in premixed flames and in particular for use in gas turbines for power generation. This is a development that follows from increasing demands for high efficiency and low emissions of NOx, which can be achieved by using premixed flames and lean pre-heated mixtures, often close to the lean flammability limit. LÄS MER

  5. 5. Numerical Study of Cellular Instability in Burner Stabilized Adiabatic Laminar Premixed Flames

    Detta är en avhandling från Department of Energy Sciences, Lund University

    Författare :Jiangfei Yu; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Detailed Numerical Simulation; Cellular premixed flame; Hydrogen; Oxy-fuel; Heat-flux burner; Hydrodynamic instability; Diffusive-thermal instability; Nonlinear flame dynamics.;

    Sammanfattning : The thesis deals with experiments and numerical simulations of adiabatic laminar premixed flames anchored to a heat-flux burner using different mixtures under various operating conditions. The aim is to obtain a better understanding of cellular instability in heat-flux burner anchored flames. LÄS MER