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Combustion Capabilities
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| Surface Mesh for a combustor |
Case Study
Combustion Capabilities Using a Bespoke Version of Newt: ‘McNewt’
This case study is a taken from paper published by members of the CFS team at the ASME Turbo Expo in 2000, demonstrating the capabilities of CFS technology.
CFD Analysis Of A Complete Industrial Lean Premixed Gas Turbine Combustor
The introduction of lean premixed combustion technology in industrial gas turbines has led to a number of interesting technical issues. Lean premixed combustors are especially prone to acoustically coupled combustion oscillations as well as to other problems of flame stability such as flashback and blow-out.
Clearly it is very important to understand the physics that lies behind such behaviour in order to produce robust and comprehensive remedies, and also to underpin the future development of new combustor designs. Simulation of the flow and combustion using Computational Fluid Dynamics (CFD) offers an attractive way forward, provided that the modelling of turbulence and combustion is adequate and that the technique is applicable to real industrial combustor geometries. The paper presents a series of CFD simulations of an actual production standard industrial combustor carried out using the McNEWT unstructured code.
The entire combustion chamber geometry is represented including the premixing ducts, the fuel injectors and the discharge nozzle to the turbine. The geometry has been interpreted directly from CAD and two different CFD grids have been generated, one for the entire assembly and one for a 1/16th sector of the combustor barrel and mixing system. A modified k-e model has been used together with an advanced laminar flamelet combustion model that is sensitive to variations in fuel-air mixture stoichiometry. Detailed results have been obtained for the non-reacting flow field, for the mixing of fuel and air and for the combustion process itself at a number of different operating conditions.
The study has provided a great deal of useful information on the operation of the combustor and has demonstrated the value of CFD-based combustion analysis in an industrial context. The findings are in broad agreement with observations and measurements of actual engine operation. A valuable new capability for gas turbine combustor modelling has been demonstrated; further model and code development is proceeding.
Proceedings of TURBO EXPO 2000
ASME Turbo Expo 2000: Land, Sea and Air
May 8-11, 2000, Munich, Germany
2000-GT-0131
| Other examples of NEWT combustion capabilities |
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| The rendered surfaces of the flame fronts from two ignition sites in an offshore equipment module |
Propagation of flame through an obstacle array under a walkway (note: adaptive refinement of underlying mesh) |
Fuel and air mixing from nozzles into a combustor |
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