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Transcript of Combustion Lesson
in order for combustion to take place and power be delivered to the drive train. The Carburetor Gasoline will not burn on its own, Gasoline needs
to be in a vapor form to burn it will not burn in the
liquid form. The carburetor's function is to make a mist form of gasoline mixed with air, which is what we know as the air/fuel mixture(the first and second part in the fire triangle).
The air/fuel mixture travels from the CARBURETOR to the cylinder trough the INTAKE MANIFOLD. The Sparkplug The sparkplug is the the third part in the fire triangle
(heat). when the PISTON is at top dead center, and there is an air/fuel mixture in the COMBUSTION CHAMBER, the SPARKPLUG ignites the air/fuel mixture sending the piston downward to the bottom dead center position, completing the POWER STROKE. Combustion Aftermath When gasoline vapors are mixed with air to create
the air/fuel mixture, a physical change happens.
After combustion, the air/fuel mixture goes trough
a chemical change where the gasoline and oxygen molecules get broken down into CO2 (Carbon Monoxide) and H2O (Dihydrogen Monoxide), with some CO (Carbon Monoxide), SO2 (Sulpher Dioxide) and NOX (Oxides of Nitrogen). A combustion reaction takes place when a fuel and an oxidant react, producing heat or heat and light. What is Fuel? Fuel is any material that stores potential energy in a form that can be practicably released and used as heat energy. General types of chemical fuels Solid Fuels
Gaseous Fuels Wood, coal, dung, etc.
Natural gas Charcoal
Diesel, gasoline, kerosene, LPG, ethanol
Hydrogen, propane Primary(natural) Secondary(artificial) The three things, are the same three things that make up the fire triangle.
Heat Inside an engine's cylinder we need the same three things that make up the fire triangle in order to have combustion.
Fuel alone cannot ignite, fuel(gasoline) must be mixed in with an oxidizer(oxygen) and heat(spark) in order to ignite. Carburation The process of mixing a hydrocarbon fuel with a correct amount of air to make an explosive mixture for an internal-combustion engine. Gasoline in a liquid form does not burn,
because the liquid form does not contain oxygen. The vapors coming from the gasoline, which is a physical change, mix with the oxygen in the atmosphere and when a heat source is introduced, it ignites. Objectives: Students will be able to define key vocabulary.
Students will have an understanding of the fire triangle.
Students will recognize the differences between a physical change and a chemical change. Physical Change: Physical change rearranges molecules but doesn't affect their internal structures. Chemical Change: Chemical change is any change that results in the formation of new chemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms. KEY TERMS: Combustion