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ESTRATTO DOCUMENTO

Where Combustion Is Important

Energy and Combustion Devices: →

Heat & Power generation efficient energy utilization (2007)

Gas Turbine for power generation, Automotive engines for transportation

Fuels: Valorani

“Energy crisis” is a “fuel crisis”!

Oil →

Coal Oil, H2&CO Mauro

Natural gas (methane)

Biomass methanol, ethanol, mix of ethanol & oil -

Pollution and Health: SAER

Soot, SOx, NOx, unburned hydrocarbons (UHC), CO, CO2

Soot from coal-derived fuels -

Sapienza

SOx from burning coal, + H2O acid rains

NOx from N2 in air or in fuels, forms at high T

CO2 global warming La

Safety: Rome

Fires, Explosions, Materials not producing toxic combustion products

Defense and Space: of

Jet engines, Liquid or Solid Propellants Rocket Motors University

Combustion instabilities

Signature and detection vulnerability from exhaust of jet and rocket engines

Chemical lasers

Hypersonic aircrafts (supersonic combustion)

Fire safety in micro-gravity (safety on ISS)

Scientific Disciplines

Thermodynamics (2007)

Combustion: Reactants Products + HEAT

Book-keeping on how much chemical energy is converted into thermal energy Valorani

Thermal & Chemical properties of substances

Laws of Equilibrium Thermodynamics (Thermo-static) Mauro

Chemical Kinetics

Identify the reactions’ paths and rates through which reactants form products -

SAER

Rate equations for non-equilibrium thermodynamics

Fluid Mechanics -

Sapienza

Chemical reactions often occur in flowing medium (spatially non homogeneous)

Convective transport (laminar or turbulent)

Transport Phenomena La

>T & [X] gradients cause transfer of energy and mass by molecular diffusion Rome

>Radiative transport of

University

Combustion = Chemical Kinetics + Fluid Mechanics + Transport Phenomena

Classification of Fundamental Combustion Phenomena (2007)

Premixed versus Non-premixed Combustion Valorani

Laminar versus Turbulent Combustion Mauro

Subsonic versus Supersonic Combustion -

SAER

Homogeneous versus Heterogeneous Combustion -

Sapienza

Stable vs Unstable Combustion La

Rome

of

University

Classification of Fundamental Combustion Phenomena

Premixed versus Non-premixed Combustion (2007)

Reactions occur only when fuel & oxidizer mix at molecular level !!

Mixedness of F & Ox pre-requisite for combustion Valorani

Mauro

-

SAER

-

Sapienza

La

Rome

of

University

Premixed Combustion System Non-premixed System

F & Ox mixed before injection in CC F & Ox not mixed before injection in CC


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DETTAGLI
Esame: Combustione
Corso di laurea: Corso di laurea magistrale in ingegneria aeronautica
SSD:
A.A.: 2007-2008

I contenuti di questa pagina costituiscono rielaborazioni personali del Publisher Atreyu di informazioni apprese con la frequenza delle lezioni di Combustione e studio autonomo di eventuali libri di riferimento in preparazione dell'esame finale o della tesi. Non devono intendersi come materiale ufficiale dell'università La Sapienza - Uniroma1 o del prof Valorani Mauro.

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Altri appunti di Combustione

Stechiometria ed equilibrio chimico
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Stabilità della fiamma
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Instabilità della fiamma
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Cinetica chimica
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