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Master's Dissertation
DOI
10.11606/D.3.2013.tde-11072014-015519
Document
Author
Full name
Marcelo Laurentys Airoldi
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Krieger Filho, Guenther Carlos (President)
Saltara, Fábio
Silva, Luís Fernando Figueira da
Title in Portuguese
Simulação de uma chama turbulenta de etanol com elementos de chama laminar e modelo das tensões de Reynolds.
Keywords in Portuguese
Combustão
Dinâmica dos Fluidos Computacional (CFD)
Etanol
Simulação numérica
Sprays
Turbulência
Abstract in Portuguese
A busca por uma nova matriz energética intensificou significativamente o desenvolvimento de fontes renováveis de energia. Dentre essas, o álcool teve grande destaque, dado que sua utilização industrial já é intensa no Brasil. Em concordância com a tendência industrial, o comportamento do álcool em vários fenômenos físico-químicos tornou-se foco de intensa pesquisa e desenvolvimento, o que levou a parcerias entre faculdades e empresas. O presente trabalho objetiva ao desenvolvimento de simulações numéricas que consigam descrever com exatidão o comportamento de chamas de sprays turbulentos de etanol. Para a verificação da aderência da simulação a processos reais, serão utilizados dados experimentais. Esses dados serviram como base comparativa de validação do modelo numérico. A descrição do spray segue a abordagem Euler-Lagrange, na qual a fase líquida segue uma abordagem lagrangeana e a fase gasosa uma abordagem euleriana. Foi considerado o acoplamento completo entre as duas fases, considerando o impacto da fase líquida no regime turbulento da fase gasosa. A turbulência da fase gasosa é descrita pelo modelo RSM (Reynolds Stress Model), baseado na média temporal e decomposição da turbulência, enquanto o escoamento interno da fase líquida é negligenciado. A chama do spray caracterizada pelo modelo flamelet, o qual utilizará um mecanismo de cinética química reduzido da oxidação do etanol.
Title in English
Simulation of a turbulent ethanol flame using flamelet and Reynolds stress models.
Keywords in English
Combustion
Computational Fluid Dynamics (CFD)
Ethanol
Numerical simulation
Sprays
Turbulence
Abstract in English
The research for a new energy source to substitute fossil fuels intensified the development of renewable energy sources. Among all, ethanol has been given great attention, once it has been widely used in many Brazilian industrial branches. In agreement with industrial trends, the behavior of ethanol became the center of innumerous researches and developments, which led to partnerships between academic and private companies. This thesis aims the development of numerical simulations that describe with accurately the behavior of ethanol turbulent spray flames. To verify correlation between model results and real process behavior, experimental data will be used for validation of the numerical model. The spray physical description is made through the use of the Euler- Lagrange approach, in which the liquid phase is described by the lagrangean approach and the gaseous phase is described by the eulerian approach. There is full coupling between both phases. The turbulent flow of the gaseous phase is modeled through the use of the Reynolds Stress Model (RSM), based on Reynolds decomposition and time averaging process. The liquid phase has no internal flow, the droplets behave as a solid sphere translating through the domain (gaseous phase). The spray flame is modeled by the flamelet model which will use a simplified chemical mechanism.
 
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Publishing Date
2014-07-11
 
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