classification of Internal combustion engines

classification of Internal combustion engines

1. AENG 251- Farm Power and Machinery Er . N. Hari Assistant professor Department of Agricultural Engineering Agricultural College, Aswaraopet PROF. JAYASHANKAR TELANGANA STATE AGRICULTURAL UNIVERSITY Rajendranagar , Hyderabad – 500 030 WELCOME

2. classified in two types They are four stroke and two stroke engines. When the cycle is completed in two revolutions of the crankshaft, it is called four stroke cycle engines. When the cycle is completed in one revolution of the crankshaft, it is called two stroke cycle engines. classification of Internal combustion engines

3. I.C. engines are of two types: ( i ) Petrol engine (carburetor type, spark ignition engine), and (ii) diesel engine (compression ignition engine). Petrol engine: It is the engine, in which liquid fuel is atomized, vaporized and mixed with air in correct proportion before entering onto the engine cylinder during suction stroke. The fuel is ignited in the cylinder by an electric spark. Diesel engine: In this engine, during suction stroke, only air is entered into the cylinder and compressed. The fuel is injected through fuel injectors and ignited by heat of compression.

4. Eco-friendly : It is also known to be eco-friendly as it helps to shorten the amount of carbon monoxide released into the air . Efficient Properties: compared to other types of fuels diesel engine has a better burning properties . Durable: this engine requires less maintenance so it tends to last for a long period of time and this are also considerably durable compared to its counterparts. Less Noisy and Compact: This is another advantage of these engines because it is less noisy and compact in size. Features of Diesel Engine

5. Working components of I.C.Engine

6. Working of two stroke cycle engine

7. Scavenging: The process of removal of burnt or exhaust gases from the engine cylinder is known as scavenging. Entire burnt gases do not go out in normal stroke, hence some type of blower or compressor is used to remove the exhaust gases in two stroke cycle engine. When the piston is at the top of its stroke, it is said to be at the top dead centre (TDC). When the piston is at the bottom of its stroke, it is said to be at its bottom dead centre (BDC). In two stroke cycle engine.

8. Key points The pressure in the engine cylinder is less than atmospheric pressure during this stroke in Suction stroke Both valves are closed during this stroke in Compression stroke there is only one power stroke and three idle strokes . Scavenging : The process of removal of burnt or exhaust gases from the engine cylinder is known as scavenging . Thermal efficiency varies between 32 and 38 % in Diesel engine Thermal efficiency varies between 25 and 32 % in Petrol engine