Diesel Engine

Topics: Internal combustion engine, Diesel engine, Compression ratio Pages: 10 (3126 words) Published: January 22, 2014
Diesel Engine
Heat engines are sometimes referred to as being motors. Actually, a motor converts one form of energy into useful work without the intentional production of heat, such as an electric motor. A device which burns fuel creating heat to perform work is a heat engine. Heat engines can be classified as external combustion, such as steam boiler, or internal combustion (IC). They can further be divided into the spark ignited (SI) engine or the compression ignited engine (CI). The compression ignited internal combustion engine has two main designs: the four stroke cycle, and the two stroke cycle engine. They are both very common throughout the world because of their high efficiency - compare with other types of heat engines. The engines convert chemical energy in fuel in to mechanical energy. A typical oil engine has:

1. Cylinder in which fuel and air are admitted and combustion occurs. 2. Piston, which receives high pressure of expanding hot products of combustion and the piston, is forced to linear motion. 3. Connecting rod, crankshaft linkage to convert reciprocating motion into rotary motion of shaft. 4. Connected Load, mechanical drive or electrical generator. 5. Suitable valves (ports) for control of flow of fuel, air, exhaust gases, fuel injection, and ignition systems. 6. Lubricating system, cooling system

The compression of the fuel/air mixture limits the compression ratio of the engine, if it compresses the air too much; the fuel/air mixture spontaneously ignites and causes knocking. A diesel compresses only air, so the compression ratio can be much higher. The higher the compression ratio, the more power is generated. Some diesel engines contain a glow plug of some sort. When a diesel engine is cold, the compression process may not raise the air to a high enough temperature to ignite the fuel. The glow plug is an electrically heated wire (think of the hot wires you see in a toaster) that helps ignite the fuel when the engine is cold so that the engine can start. Component s of Diesel Power Plants

1. Engine
2. Air Intake System
3. Engine Starting system
4. Fuel System
5. Exhaust System
6. Cooling System
7. Lubricating System
Engine- Functions Of Important Parts In Internal Combustion Engine. Internal combustion engines are made from various parts. Each part has its own location and function for proper working of engine. Cylinder Block

Piston Rings
Connecting Rod
Gudgeon Pin
Crank Pin
Crank Shaft
Cam Shaft
Inlet Valve & Exhaust Valve
Fuel Pump
Spark Plug
Fuel Injector
Cylinder Block
Function- In the bore of cylinder the fresh charge of air-fuel mixture is ignited,compressed by piston and expanded to give power to piston. Cylinder Head
Function-It carries inlet and exhaust valve.Fresh charge is admitted through inlet valve and burnt gases are exhausted from exhaust valve.In case of petrol engine,a spark plug and in case of diesel engine,a injector is also mounted on cylinder head. Piston

Function-During suction stroke,it sucks the fresh charge of air-fuel mixture through inlet valve and compresses during the compression stroke inside the cylinder.This way piston receives power from the expanding gases after ignition in cylinder.Also forces the burnt exhaust gases out of the cylinder through exhaust valve. Piston Rings

Function-It prevents the compressed charge of fuel-air mixture from leaking to the other side of the piston. Oil rings, is used for removing lubricating oil from the cylinder after lubrication. This ring prevents the excess oil to mix with charge. Connecting Rod

Function-It changes the reciprocating motion of piston into rotary motion at crankshaft. This way connecting rod transmits the power produced at piston to crankshaft. Gudgeon Pin
Function- Connects the piston with small end of connecting rod. Crank Pin
Function- hand over the power and motion to the crank shaft which come from piston through connecting rod. Crank Shaft...
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