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Ding, Y. (author)
Characterising combustion of diesel engines is not only necessary when researching the instantaneous combustion phenomena but also when investigating the change of the combustion process under variable engine operating conditions. An effective way to achieve this goal is to parameterize the combustion process using a finite combustion stage...
doctoral thesis 2011
document
Mailybaev, A.A. (author), Marchesin, D. (author), Bruining, J. (author)
This paper analyzes traveling wave profiles possessing an internal resonance point for a class of systems of partial differential equations describing oxidation and vaporization of liquid fuel in a porous medium when an oxidizer (air) is injected. It is shown that the resonance is characterized by a saddle point of an associated vector field...
journal article 2011
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Danon, B. (author)
In this thesis three different combustion systems, equipped with either a single or multiple ?ameless combustion burner(s), are discussed. All these setups were investigated both experimentally and numerically, i.e., using Computational Fluid Dynamics (CFD) simulations. Flameless combustion is a combustion technology capable of accomplishing the...
doctoral thesis 2011
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Sliphorst, M. (author)
Ever since the early stages of space transportation in the 1940’s, and the related liquid propellant rocket engine development, combustion instability has been a major issue. High frequency combustion instability (HFCI) is the interaction between combustion and the acoustic field in the combustion chamber. It destroys the thermal boundary layer...
doctoral thesis 2011
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Tortosa Masiá, A.A. (author)
This PhD thesis deals with the theoretical, experimental and modeling work which was performed to study deposition during biomass and waste co-combustion in pulverised coal facilities. Fossil fuels dominate the current energy scenario. Increasing concerns about fossil fuels availability and about the impact of their extensive use on the...
doctoral thesis 2010
document
Paravento, F. (author)
In this work the modeling of the interaction of a premixed flame with one ore more obstacles of different shape is considered. The challenge of this work was to design a fast numerical tool suitable for a standard personal computer. A tool able to use a simplified chemical model that removes the need to solve a large system of conservation...
doctoral thesis 2009
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Van Putten, J.G. (author)
Power producing companies have faced a new situation following the development of unregulated electricity markets. Strong competition forces them to take power production costs into account more carefully in order to maintain or increase profits. Additionally, to promote the efforts to reduce CO2 emissions,legislation and taxation drives...
doctoral thesis 2008
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Ahnert, F. (author)
Biomass combustion can be an economic way to contribute to the reduction of CO2 emissions, which are a main suspect of the so-called greenhouse effect. In order to promote a widespread utilization of biomass combustion, operational problems like fuel treatment, slagging, fouling and corrosion have to be solved. There are few research initiatives...
doctoral thesis 2007
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Glazer, M.P. (author)
Growing demand for energy in the world, depletion of fossil fuels and green house effect require from us to utilize alternative, renewable sources of power. Biomass gained in the last few years more and more attention especially in Europe. Many research programs focused on the various forms of thermal biomass utilization have been launched and...
doctoral thesis 2007
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Braack, M. (author), Richter, T. (author)
We describe recent developments in the design and implementation of finite element methods for the compressible Navier-Stokes equations modeling chemically reactive flows. The emphasize is on the low-Mach number regime including the limit case of incompressible flow. The most important ingredients are appropriate finite element discretizations,...
conference paper 2006
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Aglave, R.H. (author), Warnatz, J. (author)
Detailed mechanisms describing ignition, flame propagation and pollutant formation typically involve several hundred species and elementary reactions, prohibiting their use in practical three-dimensional engine simulations. Conventionally reduced mechanisms often fail to predict minor radicals and pollutant precursors. The ILDM-method is an...
conference paper 2006
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Perminov, V. (author)
The most dangerous form of the forest fire is crown fire which causes the largest damage. Considering that, natural investigations of these problems are merely impossible, methods of mathematical modeling are urgent. Mathematical model of forest fire was based on an analysis of known experimental data and using concept and methods from reactive...
conference paper 2006
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Bauer, J. (author), Bykov, V. (author), Maas, U. (author)
The usage of detailed chemical kinetics for the mathematical modeling of combustion processes is desirable, but leads to a high computational effort. In the present work one of the methods of simplification of chemical kinetics - Intrinsic low-dimensional manifolds (ILDMs) is considered. Whereas in most CFD applications ILDMs are calculated in...
conference paper 2006
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Bohbot, J. (author), Gillet, N. (author)
This paper highlights the impact of different mesh remapping techniques on staggered grids in the context of combustion simulations in particular for direct injection Diesel engines. A remapping method based on a least squares method is used on the staggered grid to interpolate non-conservative variables like pressure and temperature. Then the...
conference paper 2006
document
Soulard, O. (author), Sabel'nikov, V. (author)
In the field of turbulent combustion, Lagrangian Monte Carlo (LMC) methods (Pope, 85) have become an essential component of the probability density function (PDF) approach. LMC methods are based on stochastic particles, which evolve from prescribed stochastic ordinary differential equations (SODEs). They are used to compute the one-point...
conference paper 2006
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Paul, S.C. (author), Paul, M.C. (author), Jones, W.P. (author)
In this work we investigate turbulent non-premixed combustion, including species concentrations and temperature, in a model of 3D cylindrical combustor. Gaseous propane (C3H8) and preheated air with temperature of 773K are injected through the combustor inlet. A Large Eddy Simulation (LES) technique is applied to solve the governing equations of...
conference paper 2006
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Lindblad, E. (author), Valiev, D.M. (author), Müller, B. (author), Rantakokko, J. (author), Lötstedt, P. (author), Liberman, M.A. (author)
New high order implicit-explicit Runge-Kutta methods have been developed and implemented into a finite volume code to solve the Navier-Stokes equations for reacting gas mixtures. The resulting nonlinear systems in each stage are solved by Newtons method. If only the chemistry is treated implicitly, the linear systems in each Newton iteration are...
conference paper 2006
document
Borrel, M. (author), Ryan, J. (author), Billet, G. (author)
A patch adaptive mesh refinement (AMR) platform is presented. Presently two Navier-Stokes solvers are available within this platform : a MUSCL and DG solver (FLUX AMR) and a multi-species MUSCL solver (MAJIC) for reacting flows. The first solver is based on cell centered approaches of finite volume type, the second solver is based on a cell...
conference paper 2006
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Geurts, B.J. (author)
We analyze the evolution of a diffusion flame in a turbulent mixing layer using large-eddy simulation. The large-eddy simulation includes Leray regularization of the convective transport and approximate inverse filtering to represent the chemical source terms. The Leray model is compared to the more conventional dynamic mixed model. The location...
conference paper 2006
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Cuenot, B. (author), Boileau, M. (author), Pascaud, S. (author), Mossa, J.B. (author), Riber, E. (author), Poinsot, T. (author), Bérat, C. (author)
Large Eddy Simulation (LES) is now recognized as an efficient numerical tool to predict gaseous combustion in industrial burners, and a number of examples of applications can be found in the literature. In these examples, the accuracy and the predictive capacity of LES are clearly demonstrated, even for unsteady phenomena. However most...
conference paper 2006
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