cfd simulation of hydrogen combustion
DESCRIPTION
CFD SIMULATION OF HYDROGEN COMBUSTION. INTRODUCTION. Hydrogen as alternative fuel Evaluation of Hydrogen combustion using CFD. OBJECTIVES AND SCOPE. Understanding of the basics of Hydrogen-oxygen reaction mechanism. To develop a two dimensional numerical mesh and flow model. - PowerPoint PPT PresentationTRANSCRIPT
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CFD SIMULATION OF HYDROGEN
COMBUSTION
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INTRODUCTION
Hydrogen as alternative fuel
Evaluation of Hydrogen combustion using CFD
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OBJECTIVES AND SCOPEUnderstanding of the basics of Hydrogen-
oxygen reaction mechanism.To develop a two dimensional numerical
mesh and flow model.To prepare a mathematical model for
hydrogen-air combustion system.The objective of this is to study CFD-
package FLUENT.
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HYDROGEN AS A FUEL It readily combines with oxygen to form
water.It has a high-energy content per weight. Hydrogen is highly flammable.Hydrogen burns with a pale-blue, almost-
invisible flame.The combustion of hydrogen does not
produce carbon dioxide (CO2), particulate, or sulfur emissions.
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Hydrogen can be produced from renewable resources.
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Table : Properties of fuels
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PROPERTIES OF HYDROGEN AS A FUEL Limits of FlammabilityMinimum Ignition EnergyQuenching Gap or Distance Self Ignition Temperature Flame SpeedDiffusivityDensityFlame characteristics
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Figure : Invisible Hydrogen Flame Igniting Broom
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Figure : Hydrogen Flame from Ruptured Fuel Cylinder
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BENEFITS OF HYDROGEN ECONOMY Strengthen National Energy Security Reduce Greenhouse Gas Emissions Reduce Air Pollution Improve Energy Efficiency
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HYDROGEN STORAGE AND DELIVERY Compressed Gas and Cryogenic Liquid
StorageMaterials-based Hydrogen StorageCurrent Technology
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COMBUSTION
Combustion accounts for approximately 85% of the worlds energy usage.
Eg: Gas turbine and jet engine. Rocket propulsion. Piston engines.Combustion is a complex interaction of
physical and chemical processes.
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The general characteristics of combustion:The first and second limits are ones that
correspond to conditions of very low pressures .
As the pressure increases, the initial densities of the reactants increase and a lower temperature is necessary for the reactions to become fast enough for explosion.
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Hydrogen Combustion
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GRID GENERATION AND MATHEMATICAL MODELING Model geometry
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Grid Generation
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MATHEMATICAL MODELLING
Continuity Equation
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Momentum Equations
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Boundary conditions •Inlet temperature of hydrogen and air
=300 k•velocity 90 m/s •Exit a pressure =101325.0 Pa
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CFD SIMULATION A number of numerical simulations have
been performed to study the combustion phenomena under adiabatic wall conditions when hydrogen air mixture changes from lean to rich and also at different mass flow rate of mixture. Figure. shows the contours of temperature (K) on the cross section along central axis of combustion chamber at stoichiometric air fuel ratio i.e. at Ф=1.
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Figure : Temperature Contours at Ф=1
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Figure : Contours of Mole fraction of h2O
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Figure : Contours of Mole fraction of N2
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Figure : Contours of Mole fraction of O2
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Figure : Contours of Mole fraction of H2
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Figure : Contours of Mole fraction of OH
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Figure : Contours of Mole fraction of O
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CONCLUSION•CFD based combustion simulations have
been done.•The combustor performance is evaluated
by predicting the temperatures of exit gas of the combustor and outer wall of the combustor.