NDLI: Effect of Combustion on Turbulence in a Gas Turbine Combustion Chamber

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Adoua, Richard Gary, J. Page
Copyright Year	2017
Abstract	Large Eddy Simulations of a lab scale single sector of a lean burn aero-engine combustor have been undertaken for both isothermal and reacting flows in order to examine the effect of combustion on the flow features and velocity fluctuations. For that purpose, use was made of the Rolls-Royce pressure based solver, PRECISE-UNS, to perform simulations. Unresolved subgrid stresses were modelled by the Wall-Adapting Local Eddy-viscosity (WALE) model and combustion by the FGM model. The liquid-phase of fuel spray uses an Eulerian-Lagrangian approach, where the trajectories of a number of fuel droplets are calculated by stepping in time. Comparison is made with experimental PIV data at the exit of the combustor for mean velocities and velocity fluctuations. The analysis of the flow inside the combustor chamber showed the classical features of turbulent confined highly swirling flow under isothermal and as well as under reacting conditions. In fact, a large central recirculation zone on the x-axis and two corner recirculation zones were found. The effect of combustion in this study is to reduce the opening angle of the jet and as a result the size of the central recirculation zone is reduced while the ones at the corner of the combustor increases. Under isothermal conditions the occurrence of the precessing vortex core (PVC) was found at the frequency of ∼82Hz with high amplitude. This produces regions with high velocity fluctuations. Under reacting conditions the PVC is damped and its frequency is shifted to ∼95 Hz and its amplitude is considerably reduced. In term of velocity fluctuations, in general, results illustrated that, under combustion configuration they are considerably reduced resulting in low turbulence intensity.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791850794
DOI	10.1115/GT2017-64694
Volume Number	Volume 2B: Turbomachinery
Conference Proceedings	ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
Language	English
Publisher Date	2017-06-26
Publisher Place	Charlotte, North Carolina, USA
Access Restriction	Subscribed
Subject Keyword	Viscosity Turbulence Swirling flow Sprays Combustion Aircraft engines Fuels Flow (dynamics) Pressure Stress Gas turbines Large eddy simulation Simulation Functionally graded materials Vortices Drops Eddies (fluid dynamics) Fluctuations (physics) Engineering simulation Combustion chambers Flamelet generated manifold Corners (structural elements)
Content Type	Text
Resource Type	Article

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