Study of Combustion by using CFD(ANSYS)

71 Pages·2016·4.07 MB·English

Tutor/s
Dr. Jordi Bonet Ruiz

Departament Enginyeria Química
Dr. Joan Llorens Llacuna
Departament Enginyería Química

Màster en

Enginyeria

Química

Treball Final de Màster

Study of Combustion Using a Computational Fluid Dynamics Software (ANSYS)

Estudio de la Combustión Usando Software de Dinámica de Fluidos
Computacional (ANSYS)

Jose Manuel Iglesias Fernández
February, 2015
Study of Combustion by using CFD(ANSYS)
Study of Combustion by using CFD(ANSYS)

Aquesta obra esta subjecta a la llicència de
Reconeixement-NoComercial-
SenseObraDerivada

http://creativecommons.org/licenses/by-nc-
nd/3.0/es/
Study of Combustion by using CFD(ANSYS)
Study of Combustion by using CFD(ANSYS)

No se equivoca el hombre que prueba distintos caminos para alcanzar sus metas,
se equivoca aquél que por temor a equivocarse no actúa.
Anónimo

En primer lugar, agradecer toda la dedicación y trabajo de mis tutores, y
profesorado que han estado implicados en la realización de este trabajo. También
agradecer a todas aquellas personas, familia, amigos, compañeros, maestros, etc.
Que de alguna manera u otra han estado presentes, animándome para seguir
siempre adelante y crecer tanto como persona como como profesional.
Study of Combustion by using CFD(ANSYS)
Study of Combustion by using CFD(ANSYS)

Contents

1. SUMMARY ................................................................................................... 1
2. INTRODUCTION .......................................................................................... 3
3. OBJECTIVES ................................................................................................ 5
4. REVIEW OF THE STATE OF THE ART .................................................... 7
4.1. Numerical simulation of combustion ...................................................... 7
4.2. Water addition in combustion systems ................................................... 9
5. COMPUTATIONAL FLUID DYNAMICS: ANSYS-FLUENT ................ 11
5.1. Performing a simulation in ANSYS: FLUENT .................................... 12
5.1.1. Geometry design ............................................................................... 13
5.1.2. Mesh generation ............................................................................... 13
5.1.3. Simulation Setup .............................................................................. 16
6. SENSITIVITY ANALYSIS ......................................................................... 21
7. RESULTS..................................................................................................... 23
7.1. Temperature profiles ............................................................................. 25
7.2. NOx ppm profiles ................................................................................. 31
7.3. Thermal NOx rate profiles .................................................................... 37
7.4. Promp NOx rate profiles ....................................................................... 43
7.5. Radical [O] profiles .............................................................................. 49
7.6. Radical [OH] profiles ............................................................................ 55
8. CONCLUSIONS .......................................................................................... 61
9. FUTURE WORK ......................................................................................... 62
REFERENCES ..................................................................................................... 63
Study of Combustion by using CFD(ANSYS)
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Study of Combustion by using CFD(ANSYS)

1. SUMMARY

This work is a study of the effect of water addition to a combustion chamber. Starting
from a review of the art and literature to understand the NOx formation phenomena and
then, using the commercial computational fluid dynamics software ANSYS FLUENT to
perform a sensitivity analysis of this water addition.
More specifically, first is a description of what can be found when searching for
computational fluid dynamics and water injection engines. Secondly, there is shown the
structure and the main characteristics of a simulation performed in ANSYS FLUENT.
Finally, there’s posed a sensitivity analysis in order to see the effect of the water addition
to a combustor, and the influence of the contact mode used to implement this addition.
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Study of Combustion by using CFD(ANSYS)