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CFD Jobs Database - Job Record #15670

Job Record #15670
TitleFunded PhD Studenship in CFD
CategoryPhD Studentship
EmployerIFPEN
LocationFrance, Rueil-Malmaison
InternationalYes, international applications are welcome
Closure Date* None *
Description:
During the development of an aeronautical gas turbine, one of the major 
concerns is to guaranty a correct
reignition in case of extinction during the flight. Whereas manufacturers 
commonly use CFD (Computational
Fluid Dynamics), and in particular LES (Large Eddy Simulation), to predict 
fuel consumption and pollutant
emissions of gas turbines, these tools are rarely used to compute the 
reignition event due to its complexity
and its high CPU cost. This explains why reignition is today essentially 
studied through experiments which
remain extremely expansive and poorly instrumented. In this context, the 
present PhD proposes to develop
LES models and methodologies to calculate reignition in gas turbines with 
good accuracy and limited CPU
cost. In order to fulfil this objective, the study will be based on a CFD 
code featuring an AMR (Automatic
Mesh Refinement) capability which will allow to keep a good resolution of 
the flame kernel during its growth
and convection in the combustion chamber, while maintaining a reasonable 
number of cells. It will also be
based on the thickened flame turbulent combustion model coupled to a reduced 
chemical mechanism
allowing a correct prediction of kinetics in the present complex 
environment.
The PhD thesis will first consider an ignition case with perfectly premixed 
gaseous fuel and air in an
academic combustion chamber providing good characterization of the flow and 
of ignition. The aim will be to
recover the ignition probability experimentally measured for different spark 
plug locations. This work will then
be extended to a similar two-phase flow configuration thus approaching 
conditions found in a real
aeronautical gas turbine. For this purpose, a thorough study of the impact 
of the liquid spray characteristics
(droplet size, evaporation properties etc…) on the ignition capability will 
be performed. It will lead to a
modelling approach proposal adapted to two-phase ignition. This modelling 
will finally be applied to a similar
case but including not only the ignition phase but also the flame 
propagation from the first burner to the
surrounding ones, as found in annular gas turbines.

Academic requirements: University Master degree in fluid mechanics, 
combustion, or related.

Language requirements: Fluency in French or English, willingness to learn 
French.

Contact Information:
Please mention the CFD Jobs Database, record #15670 when responding to this ad.
NameCédric Mehl
Emailcedric.mehl@ifpen.fr
Email ApplicationYes
Phone+33147527194
URLhttps://www.ifp-school.com/en/thesis/large-eddy-simulation-spark-ignition-aeronautical-combustion-chambers
Address1-4 avenue de Bois Préau
Record Data:
Last Modified15:17:20, Monday, February 18, 2019

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