Internal combustion engine
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Internal combustion engine

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Internal combustion engine Internal combustion engine Presentation Transcript

  • VEMU INSTITUTE OF TECHNOLOGY P.KOTHAKOTA
  •  ENGINE is a machine that converts thermal energy to mechanical work.
  • Internal Combustion Engine :The combustion of fuel takes place inside the combustion chamber. Eg: Petrol/Diesel Engine.
  •  INTERNAL COMBUSTION  Petrol,diesel engines.  Works on principle of OTTO cycle..  SPARK IGNITION ENGINES.  2-Stroke engines,4- stroke engines.  EXTERNAL COMBUSTION.  Thermal power plant.  Works on principle of DIESEL cycle.  COMPRESSION IGNITION ENGINES.  Diesel engine.
  • OPERATION OF PISTION…...  STROKE-The distance moved by the piston in one direction is known as stroke..  Top dead center to Bottom dead center results a stroke.  Connecting rod converts receprocating motion to rotating motion.  Crank shaft is gets the rotating motion and shaft is driven..
  • 2-STROKE ENGINE… >SUCESSION AND COMPRESSING DURING UPWARD STROKE OF THE PISTON. >EXPASION AND EXHAUST DURING DOWNWARD STROKE. .>THERE IS ONE POWER STROKE FOR EVERY REVOLUTION OF CRANK SHAFT.
  • 4-STROKE ENGINE OPERATION STEPS INVOLVED: 1-SUCESSION 2-COMPRESSION 3-COMBUSTION 4-EXHAUST
  • PRINCIPLE INVOLVED THE OTTO CYCLE: >A German Scientist Dr.A.N.Otto was the first persion to suceed in working an engine on this cycle in 1876. >It is a constant volume cycle. > Idealised Pressure/volume diagram of the Otto cycle showing combustion heat input Qp and waste exhaust output Qo, the power stroke is the top curved line, the bottom is the compression stroke >OTTO cycle is a typical cycle for most of the vechiles.. >1-2:Intake stroke-sucession;2-3:compression stroke; 3-4:Heat addition stroke;4-1:Exhaust stroke.
  • ADVANTAGES  More compact and occupy less space.  Starting is easy and quick.  Pocess high thermal efficiency.  Do not require any auxiliary equipments such as boilers and condensers.  Simple in design and low cost. DISADVANTAGES  Require more refined fuels which are costly.  Requires devices like fuel injector and carburator.  Only suitable for smaller capacity units.  IC engines lose 42% of their energy to exhaust and 28% of their energy to the cooling system.
  • Internal combustion engines are among the most important engineering applications. The theory of application either depends on Diesel or Otto cycles. They are categorized either according to the operating cycle, or due to the mechanism of working. Each type of engines has some advantages over the other one. Thus, the selection of the appropriate engine requires determining the conditions of application.
  • THANK UU……