Nicholas DiPreta Alex Leondis Internal Combustion Engine
Basic Premise • Conversion of PE from propellant to a desired motion Propellant and engine create motion
Where it Came From Internal combustion engine is derived from the military cannons of old.
Internal Combustion ~ Ignited small amount of fuel in compressed space creates expanding gas-> Otto Cycle + = Compression of gas and air ignites and explodes!
Otto Cycle • Nikolaus Otto, 1867 • Four Step Process • Intake, Compression, Combustion, Exhaust
Step 1~ Intake Stroke • Intake valve opens, allowing propellant air mixture into cylinder- like putting hairspray in our gun. • Piston begins to move downwards
Step 2~Compression Stroke • Piston moves back up to increase pressure of gas air mixture. • Like pushing the potato further into the chamber via ramrod.
Step 3~Ignition/Combustion • Spark plug ignites fuel, driving piston and down • Like igniting the barbeque igniter
Step 4~ Exhaust Stroke • Exhaust valve opens, allowing exhaust out • Similarly, exhaust is emitted from the potato gun
The Cycle • The Internal Combustion Engine undergoes a repetitive cycle that differentiates it from a simple explosion powered gun http://auto.howstuffworks.com/engine1.htm
Engine Arrangements • Inline, V, or Flat
Physics Applications • Impulse • Work/KE relation • Fdcos(ᶱ)= ∆KE is transferred into potential and back throughout trajectory Trying to optimize results by adhering to formulae