Results 211 to 220 of about 20,374 (260)

Scaling the flame transfer function of confined premixed conical flames

Proceedings of the Combustion Institute, 2013
Abstract The influence of confinement side walls on the response of premixed conical flames submitted to velocity disturbances is investigated experimentally and theoretically. When the flame is sufficiently confined, the burnt gases cannot fully expand at the nozzle outlet.
Thierry Schuller, D Durox
exaly   +2 more sources

Experimental analysis of nonlinear flame transfer functions for different flame geometries

Proceedings of the Combustion Institute, 2009
Abstract Nonlinear features of flame dynamics are characterized by measuring the flame transfer functions for different input levels. This provides a family of gain and phase curves, which constitute the Flame Describing Functions (FDF) and can be used to analyze self-sustained combustion oscillations.
Thierry Schuller, N Noiray, D Durox
exaly   +2 more sources

Impact of flame-wall interaction on premixed flame dynamics and transfer function characteristics

Proceedings of the Combustion Institute, 2011
Abstract In this paper, we numerically investigate the response of a perforated-plate stabilized laminar methane–air premixed flame to imposed inlet velocity perturbations. A flame model using detailed chemical kinetics mechanism is applied and heat exchange between the burner plate and the gas mixture is incorporated.
A F Ghoniem
exaly   +3 more sources

Pressure Influence on the Flame Transfer Function of a Premixed Swirling Flame

Volume 1: Combustion and Fuels, Education, 2006
In order to assess the stability of gas turbine combustors measured flame transfer functions are frequently used in thermoacoustic network models. Although many combustion systems operate at high pressure, the measurement of flame transfer functions was essentially limited to atmospheric conditions in the past.
E. Freitag, H. Konle, M. Lauer, C. Hirsch, T. Sattelmayer   +4 more
openaire   +1 more source

On the spatial characteristics of the flame transfer function for a GCH4-GO2 swirl coaxial flame

Acta Astronautica
Youngbin Yoon, Jinhyun Bae
exaly   +2 more sources

Development of a Flame Transfer Function Framework for Transversely Forced Flames

Volume 1B: Combustion, Fuels and Emissions, 2013
This paper describes a framework for the development of a flame transfer function for transversely forced flames. While extensive flame transfer function measurements have been made for longitudinally forced flames, the disturbance field characteristics governing the flame response of a transversely forced flame are different enough to warrant separate
Jacqueline O’Connor, Vishal Acharya
openaire   +1 more source

Influence of the Swirler Design on the Flame Transfer Function of Premixed Flames

Volume 2: Turbo Expo 2005, 2005
A novel approach to the description of flame transfer functions of premixed swirling flames is presented based on a simplified analysis of the vorticity transport equation. With this model it is possible to reproduce transfer function amplitude in excess of unity observed for swirling flames as well as to explain the differences seen in flame transfer ...
C. Hirsch, D. Fanaca, P. Reddy, W. Polifke, T. Sattelmayer   +4 more
openaire   +1 more source

Modeling tools for the prediction of premixed flame transfer functions

Proceedings of the Combustion Institute, 2002
The response of flames to incident perturbations is of central interest in combustion dynamics analysis. The problem can be described in the linear regime by a transfer function. It is shown in this article that the description of the perturbed velocity field incident on the flame front is of crucial importance when dealing with the flame transfer ...
Schuller, Thierry, Ducruix, Sébastien, Durox, Daniel, Candel, Sébastien   +3 more
openaire   +2 more sources

Flame Transfer Function Characteristics of Swirl Flames for Gas Turbine Applications

Volume 2: Turbo Expo 2003, 2003
For the suppression or reduction of self-sustained combustion instabilities, modifications of the burner outlet conditions, that strongly influence the dynamic flame response, seem to be the most promising way. Therefore, to derive a detailed physical understanding of the feedback mechanisms the dynamic flame response characteristics, quantified by ...
Martin Lohrmann, Horst Bu¨chner, Nikolaos Zarzalis, Werner Krebs   +3 more
openaire   +1 more source

URANS-Modelling of Flame Transfer Functions of Turbulent Premixed Jet Flames

Volume 1: Turbo Expo 2004, 2004
The understanding of the formation of self excited pressure oscillations in technical combustion systems depends on the knowledge of the dynamical behaviour of the flame used. As an important mechanism driving these combustion instabilities the formation and reaction of coherent large-scale ring-vortices has been indentified.
Matthias Hettel, Peter Habisreuther, Horst Bu¨chner, Henning Bockhorn, Nikolaos Zarzalis   +4 more
openaire   +1 more source