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Indian Institute of Technology Bombay

Indian Institute of Technology Bombay. Introduction of the Combustion. Why you should study a course on “Combustion”. Indian Institute of Technology Bombay. Contents. 85% of the total energy comes from combustion sources Coal Solid fuel (~20 – 25%)

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Indian Institute of Technology Bombay

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  1. Indian Institute of Technology Bombay Introduction of the Combustion Why you should study a course on “Combustion”

  2. Indian Institute of Technology Bombay Contents • 85% of the total energy comes from combustion sources • Coal Solid fuel (~20 – 25%) • Natural gas Gaseous fuel (~ 20 – 25%) • Kerosene and diesel Liquid fuel (~40%) • Definition of the combustion • Application the Combustion • The Object of the Combustion Research • - Relation to the other studies • - Research methods • Current issues

  3. Indian Institute of Technology Bombay Category of the Combustion Cooking Thermal power generation Transportation Heating Rocket launch

  4. Indian Institute of Technology Bombay What is the Combustion Heat Fuel Energy + Oxidizer Product ·Heating ·Power generation · Gas ·Coal ·Oil CO2 H2O • O2 • Air • Halogens

  5. Indian Institute of Technology Bombay Combustion types Gasoline, Diesel and kerosene and so on This type is used in internal and external engine. Ex) Gasoline engine, Diesel engine and jet engines and rocket engines Gas Combustion Solid combustion Liquid combustion CH4, C3H8 etc.. Gases are used. This type combustion is extensively used in domestic and an industrial systems. It can do the perfect combustion and low emissions. Ex) Gas burner , Boiler , Heater , and so on Coal , Wood and garbage and so on.. This type combustion is used in an industrial system transportation for example, an iron works and Ship and Steam engine It is hard to do perfect combustion

  6. Indian Institute of Technology Bombay The Object of the Combustion Research High Efficiency Low emissions Stability Experiment Simulation Application to living and industrial

  7. Indian Institute of Technology Bombay How combustion is connected to other fields? Fluid dynamics Combustion Chemical kinetics Mathematics Thermo dynamics Heat transfer Flow field analysis Heat generation and transfer analysis Modeling and Solving the governing equations Chemical reaction analysis

  8. Indian Institute of Technology Bombay Research methods (simplification) Oxidizer Oxidizer Flame Fuel Counter flow flame Simplest configuration of 1-D flame Stagnation Plane Fuel Air Fuel Industrial burner Jet flame

  9. Indian Institute of Technology Bombay Experiment Gas measuring Visualization Hydrocarbon, CO, CO2 O2, NO, N2O, NO2… Temperature measurement Velocity measurement and so on.. Analyze characteristic of the flame

  10. Indian Institute of Technology Bombay Numerical Modeling Experimental geometry Comparison with experiment result Modification Simple modeling Analyze phenomena Governing equations Numerical techniques

  11. Indian Institute of Technology Bombay Numerical results (example) (a) 0ms (c) 3.0ms (b) 2.4ms (d) 3.6ms

  12. Indian Institute of Technology Bombay Current issues Reducing the emission. - CO, CO2, NOx …. 500yen scale burner Increase the efficiency - Heat recirculation (ex : heating injected air ..) Swiss roll combustor MEMS power source - energy density is higher than battery Step microcombustor 4 W thermal input

  13. Indian Institute of Technology Bombay Current issues Reducing the emission. - CO, CO2, NOx …. Increase the efficiency - Heat recirculation (ex : heating injected air ..) • Flameless combustion with liquid fuels :- very low NOx emissions • Formation of spray • Vaporization of the spray • Mixing with the surrounding oxidizer (air) • Ignition of the mixture • Burning

  14. Indian Institute of Technology Bombay Evaluation Scheme for the course Assignments 15 % Quizzes 20 % Mid-semester exam 25 % Final semester exam 40 % Possibility of surprise quizzes Late submission of assignment unacceptable Poor attendance will fetch a special bonus (early grade)

  15. Indian Institute of Technology Bombay Topics to be covered Introduction Combustion and Stoichiometry Basics of Mass transfer Basics of Chemical Kinetics Important chemical mechanisms Conservation equations for reacting flows Laminar premixed flames Laminar diffusion flames Droplet evaporation and burning Introduction to turbulent flow and turbulent premixed and non premixed flames

  16. Indian Institute of Technology Bombay References • An introduction to Combustion S R Turns • Combustion theory F A Williams • Combustion physics C K Law • Combustion I. Glassman • Combustion Fundamentals R A Strehlow • Fundamentals of Combustion K KKuo • Understanding Combustion H S Mukunda • Fundamentals of Combustion D P Mishra • Journals: • Combustion and Flame • Proceedings of the Combustion Institute • Combustion Science and Technology • Combustion theory and modeling • Various other Combustion and energy journals

  17. Thanks to Dr. S. G. Kim of “Korean Institute of Energy Research” for preparing this nice presentation on “Introduction to Combustion”

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