Towards Reduced Order Models of Small-Scale Acoustically Significant Components in Gas Turbine Combustion Chambers

  title={Towards Reduced Order Models of Small-Scale Acoustically Significant Components in Gas Turbine Combustion Chambers},
  author={Suhas A. Kowshik and S. Sridhar and Nicholas C. W. Treleaven},
  journal={Volume 3B: Combustion, Fuels, and Emissions},
Gas turbine combustion chambers contain numerous small-scale features that help to dampen acoustic waves and alter the acoustic mode shapes. This damping helps to alleviate problems such as thermoacoustic instabilities. During computational fluid dynamics simulations (CFD) of combustion chambers, these small-scale features are often neglected as the corresponding increase in the mesh cell count augments significantly the cost of simulation while the small physical size of these cells can… 



A tensorial approach to computational continuum mechanics using object-oriented techniques

The implementation of various types of turbulence modeling in a FOAM computational-fluid-dynamics code is discussed, and calculations performed on a standard test case, that of flow around a square prism, are presented.

Thermoacoustic stabilization of a longitudinal combustor using adjoint methods

A low-order thermoacoustic network model is constructed that contains the most influential physical mechanisms of a therMOacoustic system and is applied to a laboratory-scale longitudinal combustor that has been found to be thermoACoustically unstable in experiments.

The Effects of Turbulence on Jet Stability and the Flame Transfer Function in a Lean-burn Combustor

ABSTRACT Large eddy simulations show that the penetration of the central jet in a multi-passage lean burn and liquid fueled combustor is dependent on the turbulence levels in the three air-flow

Machine Learning for Fluid Mechanics

Fundamental ML methodologies are outlined and their uses for understanding, modeling, optimizing, and controlling fluid flows are discussed and the strengths and limitations of these methods are addressed.

An Efficient Method to Reproduce the Effects of Acoustic Forcing on Gas Turbine Fuel Injectors in Incompressible Simulations

Previous studies have highlighted the importance of both air mass flow rate and swirl fluctuations on the unsteady heat release of a swirl stabilised gas turbine combustor. The ability of a

Flame–cooling air interaction in an effusion-cooled model gas turbine combustor at elevated pressure

The focus of this work is the investigation of flame–cooling air interaction by means of wall temperature (2D themographic phosphor thermometry), gas phase temperature (coherent anti-Stokes Raman

Acoustic Analysis of Gas Turbine Combustors

Combustion instability has become a major issue for gas turbine manufacturers. Stricter emission regulations, particularly on nitrogen oxides, have led to the development of new combustion methods,

Polynomial identification of POD based low-order dynamical system

Low-order modelling based on POD approach has proved to be an efficient tool to analyze turbulent flows as well as to build control systems. In this paper, a novel method to identify low-order

On the theory of unsteady high Reynolds number flow through a circular aperture

  • M. S. Howe
  • Physics
    Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
  • 1979
This paper examines the theory of the unsteady motion caused by fluctuations in the driving pressure of a high Reynolds number mean flow through a circular aperture in a thin rigid plate. A