module double SE152-153

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22 Φεβ 2014 (πριν από 3 χρόνια και 6 μήνες)

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Department: Energy: Production, Transformation


SE152
-
153

Combustion

applied

to

turbojet

engines

S9


Persons in charge:

Guillaume CASTANET, chercheur CNRS


guillaume.castanet@univ
-
lorraine.fr



Olivier PENANHOAT, ingénieur SNECMA


olivier.penanhoat@snecma.fr



Duration:

42 hours

ECTS credits:

4

Objective

To enable students to understand the basic concept of combustion and more advanced insights

into
certain relevant industrial and practical problems concerning turbojet engines. This module also
introduces some elements on highly energetic compressible flows, e.g. shock waves.


Content

-

Program



Thermodynamics of a mix of chemical species
(C1)

-

GC

Chemical equilibrium. Temperature of an adiabatic flame.




Chemical kinetics

(C1)

-

GC

Rate and extend of a reaction. Poor combustion vs rich combustion. Reducing the schemes.




Laminar combustion

(C2
-
C4)
-

GC

Premixed laminar flames: examples, o
n
e
-
dimen
sional equations, the propagation velocity, and the
structure of the flames. Flame front instabilities.

Diffusion
-
controlled laminar flames: examples, passive scalar, the end temperatures.




Practical work



GC


Propagation and stabilisation of a pre
-
mixed
flame.




Two
-
phase combustion
(C5)

-

GC

Isolated droplet. Sprays. Different types of two
-
phase combustion.




Combustion waves
(C6
-
C7)

-

GC


Basic notions on compressible flows. On
e
-
dimensional equations. Typical flows (isentropic flows,

Rayleigh’s flow). Sh
ock waves.

Detonation vs. deflagration. Chapman
-
Jouguet theory of the detonation. Structure and velocity of a
detonation wave.




Turbulent combustion

(C8
-
C10)
-

OP

Modeling turbulent combustion. “Reynolds
-
Averaged Navier
-
Stokes” models. Closure model for
t
he average reaction rate. Turbulent diffusion flames
-

premixed turbulent flames: main models
(Eddy Break Up, CLE, Probability Density Function, PCM). Numerical methods
(RANS, Large
Eddy Simulations, Direct Numerical Simulations). Applications to turbojet
engines.




Reduction of polluting emissions

(C11
-
C12)
-

OP

Modeling of pollutants formation
(NOx, CO, UHC, particles); influence of the composition of the
fuel; low NOx future combustion chambers; impact on the environment (air quality and greenhouse
effect
); future alternate “drop
-
in” fuels: impact on the ultra small particles, CO
2

“Well to Wing”
assessments; measuring pollutants.





Final test

(C14)
-

GC



Assessment

methods


Redaction after the practical work +

Final test.



Teaching

aids

Documents for the

lectures and the TD.



Principles of combustion. Kuo. Wiley (2005).


La combustion et les flammes. Borghi et Destriau.
Editions Technip (2005).


Theoretical

Numerical

Combustion. Veynante &
Poinsot

2005.

http://elearning.cerfacs.fr/COURSES/COMBUSTION/combustion.php