Abstract
In the gas turbine combustion system, the external flows in annuli play one of the key roles in controlling pressure loss, air flow distribution around the combustor liner, and the attendant effects on performance, durability, and stability. This paper describes a computational fluid dynamics (CFD) simulation of the flow in the outer annulus of a can combustor. Validating this simulation was done with experimental results obtained from analyzing the flow inside a can combustor annulus that was used in a Babylon/Iraq gas turbine power station. Pitot static tubes were used to measure the velocity in ten stations in the annular region. By using the velocity profile for comparison, a good agreement between the CFD simulation and experimental work was observed. Nomenclature: R: radius of combustor (mm) r: local radius (mm) Pt: total pressure (Pascal) Ps: static pressure (Pascal) DG: damp gap (mm) X/Dc: axial distance is normalized with the diameter of the casing as the origin. A, B and L: station of measurement and investigated locations. u: local axial velocity U: mass average axial velocity at inlet Keywords: Annulus Flow, Can Combustor, CFD Simulation, Pitot Static Tube, Velocity Profile.
Highlights
A can combustor is an integral part of a gas turbine power unit
This paper describes a computational fluid dynamics (CFD) simulation of the flow in the outer annulus of a can combustor
Validating this simulation was done with experimental results obtained from analyzing the flow inside a can combustor annulus that was used in a Babylon/Iraq gas turbine power station
Summary
A can combustor is an integral part of a gas turbine power unit. It receives air from a compressor and delivers it to the turbine at an elevated temperature; it is highly desirable to have this done with better overall efficiency and smoke free combustion. Miao and Wu [6] conducted numerical investigations on flat, three-dimensional, discrete-hole film cooling geometries that included the main flow, injection tubes, impingement chamber, and supply plenum regions. They found that the predicted data for a low-Reynolds k-Ɛ turbulence model fitted closely with the experimental data. Alkhafagiy and Rahim [9], investigated the design of can combustors with non-swirling and swirling flows at the inlet which they considered for analysis in an isothermal environment, through CFD study They show that the numerical results which are validated against the experimental results are reasonable. Singh and Veeravalli [10], studied the annulus flow characteristics of a can combustor model for different liner dome shapes which have been experimentally established under isothermal flow conditions for both non-swirling and swirling flow; they found that swirling flow with a hemispherical dome liner gives better flow characteristics in the annulus region
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