Modeling and Analysis of Dry Low Emission Combustor Discharge Nozzle Material & Structure for Rolls Royce Industrial RB211 Gas Turbine

The title of this dissertation is Modeling and Analysis of Dry Low Emission Combustor
Discharge Nozzle Material and Structure for Rolls Royce Industrial RB211 Gas Turbine.
Rolls Royce is looking into possible or alternative material for the discharge nozzle in
OLE Combustor in order to increase the cycle usage or service life based on stress,
deformation and heat flux to reduce their maintenance cost. Service life or cycle usage of
the discharge nozzle is basically reduced by high stress, deformation, and total heat flux.
The possible improvement in terms of the alternative material and the right geometrical
structure will help to solve this problem. The objectives are to model and analyze the
discharge nozzle in DLE Combustor in Industrial Rolls Royce RB211 Gas Turbine, to do
Finite Element Analysis (FEA) modeling and to analyze stress, total heat flux, and total
deformation in the discharge nozzle structure by changing the geometry and material and
lastly to fmd alternative material for the discharge nozzle. The project uses two different
software for designing and simulation which are AUTO DESK INVENTOR Professional
2010 and ANSYS software. The scope of study are modeling and analysis of Dry Low
Emission Combustor Discharge Nozzle Structure for Rolls Royce RB2ll Gas Turbine,
FEA modeling and analyzing stresses, total heat flux, and deformation in the discharge
nozzle structure for Rolls Royce RB211 Gas Turbine by changing the geometry and
material, possible improvement in terms of material for the discharge nozzle by focusing
on the service life and lastly alternative material for the discharge nozzle of RB211 Gas
Turbine. The methodology consists of flow of the project and the method of using
AUTODESK INVENTOR Professional 2010 and ANSYS software. Three different
geometry and materials are compared. The geometrical changes are based on the three
different exhaust areas resulted by three different height setting. The actual exhaust area
is 0.0225 m2 (Model C). The impact is analyzed by changing the area to 0.018 m2 (Model
A) and 0.02025 m2 (Model B). It is found that Model B is appropriate to satisfY low
deformation and low stresses requirement. Three materials are chosen which are
Hastelloy X, Haynes 230 and Haynes 214. From the fmdings, Haynes 230 will be the best
alternative material for the discharge nozzle because it has the lowest Von Mises Stress,
Intensity of Stress and total heat flux.