ic engines introduction
DESCRIPTION
introduction about internal combustion engines and working principle.TRANSCRIPT
1. Syllabus2. Definition of engine3. Types of engines4. Engine parts5. SI engines – two & Four stroke6. Working principle7. Animation of engine cycle8. Air fuel ratio requirements9. Design of carburetor10. Fuel jet size and venturi size11. Stages of combustion12. Normal and abnormal combustion13. Factors affecting knock14. Combustion chambers15. Introduction to thermodynamic analysis of
SI engine combustion process
Contents
ME2041 Advanced IC Engines
UNIT - I SPARK IGNITION ENGINES
Air-fuel ratio requirements, Design of carburetor –fuel jet size and venture size, Stages of combustion-normal and abnormal combustion, Factors affecting knock, Combustion chambers, Introduction to thermodynamic analysis of SI Engine combustion process.
Engine
……is a device which transfer one form of energy into another form
Internal Combustion Engine
….is a device which produces mechanical power from chemical energy contained in the fuel
ENGINE CLASSIFICATIONS
1. Type of Ignition
2. Engine Cycle
3. Valve Location
4. Basic Design
5. Position and Number of Cylinders
6. Air Intake Process
7. Method of Fuel Input
8. Fuel Used
9. Application
10.Type of cooling
ENGINE CLASSIFICATIONS
1.Type of Ignition
Spark Ignition (SI)
Compression Ignition (CI)
2. Engine Cycle
Two Stroke
Four Stroke
ENGINE CLASSIFICATIONS
3. Valve Location
Valves in Head (Over Head Valve)
Valves in Block (Flat Head)
One Valve in Head (intake) & one in
Block)
ENGINE CLASSIFICATIONS
4. Basic Design
Reciprocating
Rotary
ENGINE CLASSIFICATIONS
5. Position & Number of cylinders
Single Cylinder
In-Line
V Engine
Opposed cylinder
engine
W engine
Opposed piston
engine
Radial engine
ENGINE CLASSIFICATIONS
6. Air Intake Process
Naturally Aspirated
Supercharged
Turbocharged
Crankcase
compressed
ENGINE CLASSIFICATIONS
7. Method of Fuel Input for SI engines
Carbureted
Throttle Body
Injection
Multi Port Injection
Gasoline Direct
Injection
ENGINE CLASSIFICATIONS
8. Fuel Used
Gasoline
Diesel
Gas (CNG, LPG,
Methane)
Alcohol
Dual Fuel
Gasohol
ENGINE CLASSIFICATIONS
9. Application
Automobile, Truck,
Bus
Locomotive
Stationary
Marine
Aircraft
Portable
ENGINE CLASSIFICATIONS
10. Type of cooling
Air Cooled (natural aircooled, Forced air
cooled)
Liquid cooled (water cooled, oil cooled)
Gas cooled (helium)
ENGINE CLASSIFICATIONS
• Cylinder block• Piston• Piston rings• Piston pin• Connecting rod• Crankshaft
• Cylinder head
• Intake valve• Exhaust
valve• Camshaft• Timing gears• Spark plug
ENGINE PARTS
Cylinder Block
• Basic frame of gasoline engine.
• Contains the cylinder.
Piston
• A sliding plug that harnesses the force of the burning gases in the cylinder.
Piston Rings
• The rings seal the compression gases above the piston keep the oil below the piston rings.
Piston Pins
• Also known as the wrist pin/gudgeon pin, it connects the piston to the small end of the connecting rod.
• It transfers the force and allows the rod to swing back and forth.
Connecting Rod
• Connects the piston and piston pin to the crankshaft.
Crankshaft
• Along the piston pin and connecting rod it converts the up and down motion (reciprocating) of the engine to spinning (rotary) motion.
Flywheel
• Carries the inertia when there is no power stroke.
Cylinder Head
• Forms the top of the combustion chamber.• Contains the valves, the passageways for
the fuel mixture to move in and out of the engine.
Intake and Exhaust Valves
• Doorway that lets the gases in and out of the engine.
Camshaft
• Through the use of an eccentric the cam lobes push the valves open.
• The valve springs close them.
Timing Gears
• These gears drive the camshaft from the crankshaft.
Spark Plug
• Electric match used to begin the combustion process of burning air and gasoline to create heat.
Engine Related Terms
• TDC (top dead center)• BDC (bottom dead
center)• Stroke• Bore• Revolution• Compression Ratio• Displacement • Cycle
Spark Ignition Engines - Two Stroke
Spark Ignition Engines - Four Stroke
Working Principle - Two Stroke
Working Principle - Two Stroke
Working Principle - Four Stroke
Working Principle - Four Stroke
Engine Working - Two Stroke
Engine Working - Four Stroke