Introduction to I.C Engines CH. 1. Prepared by: Dr. Assim Adaraje
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1 Introduction to I.C Engines CH. 1 Prepared by: Dr. Assim Adaraje 1
2 An internal combustion engine (ICE) is a heat engine where the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine the expansion of the high-temperature and highpressure gases produced by combustion apply direct force to some component of the engine. The force is applied typically to pistons. This force moves the component over a distance, transforming chemical energy into useful mechanical energy. 2
3 The first modern internal combustion engine was created in 1876 by Nikolaus Otto ( Otto engine). The term internal combustion engine usually refers to an engine in which combustion is intermittent, such as the more familiar four-stroke and twostroke piston engines, along with variants, such as the six-stroke piston enginee 3
4 Engines Four-Stroke Gasoline Engine, Two-Stroke Gasoline Engines, Diesel Engine, Rotary Engine and Steam Engine. 4
5 Internal Combustion Engines Steady Non-steady Gas Turbine Uses compressor and turbine, not piston-cylinder Premixed-charge Fuel and air are mixed before/during compression Usually ignited with spark after compression Turboshaft All shaft work to drive propeller, generator, rotor (helicopter) Turbofan Part shaft, part jet - "ducted propeller" Turbojet All jet except for work needed to drive compressor Ramjet No compressor or turbine Use high Mach no. ram effect for compression Rocket Carries both fuel and oxidant Jet power only, no shaft work Two-stroke One complete thermodynamic cycle per revolution of engine Four-stroke One complete thermodynamic cycle per two revolutions of engine Non-premixed charge Only air is compressed, fuel is injected into cylinder after compression Two-stroke One complete thermodynamic cycle per revolution of engine Four-stroke One complete thermodynamic cycle per two revolutions of engine Solid fuel Fuel and oxidant are premixed and put inside combustion chamber Liquid fuel Fuel and oxidant are initially separated and pumped into combustion chamber 5
6 Classification According to type of fuel used. Petrol engine. Diesel engine. Gas engine. Bi-fuel engine. Bi-fuel vehicles or otherwise known as dual fuel are vehicles with multifuel engines capable of running on two fuels. According to number of strokes per cycle. 4 stroke engines. 2 stroke engines. 6
7 Classification According to method of ignition. Spark ignition, (SI) Compression ignition, (CI) According to the cycle of combustion. Otto cycle. Diesel cycle. Duel combustion. The dual combustion cycle, like the ideal diesel cycle is a mathematical model, but comes closer to what actually happens in the cylinder of a diesel engine. According to the number of cylinders. Single cylinder. Multi cylinder. 7
8 Classification according to the arrangement of cylinders According to the arrangement of cylinders Vertical engine. Horizontal. Inline engine. Radial engine. V- engine. According to method of cooling Air cooled engine. Water cooled engine. 8
9 9
10 Engines Parts 10
11 1. Cylinder Part of the engine where fuel is burnt and power is developed. Inside diameter is called as bore. Sleeve is fitted tightly in the cylinder to prevent wearing of block. 2. Piston Close fitting hollow cylinder plunger moving to and fro in the cylinder. Function power developed by the combustion of fuel is transmitted by piston to the crank-shaft through the connecting rod. 11
12 3. Piston rings Metallic rings inserted into groves provided at top end of the piston. Function it maintains a gas-tight joint between the piston and the cylinder. 4. Connecting rod Link that connects the piston and crankshaft by means of pin joint. Function it converts the rectilinear motion of the piston into rotary motion of crankshaft. 12
13 5. Crank and crankshaft Crank is a lever that is connects crankshaft and piston rod. 6. Valves These are devices which control the flow of intake and exhaust gases. 7. Fly wheel Mounted on crankshaft to maintain uniform rotation of crankshaft. 8. Crankcase Enclosure for crankshaft and sump for lubricating oil. 13
14 Internal Combustion Engines Terminology: 1. Cylinder bore (B): The nominal inner diameter of the working cylinder. 2. Piston area (A): the area of a circle diameter equal to the cylinder bore. 3. Top Dead Center (T.D.C.): the extreme position of the piston at the top of the cylinder. In the case of the horizontal engines this is known as the outer dead center (O.D.C.). 14
15 Four stroke petrol engine Intake or Suction stroke Compression stroke Power stroke Exhaust stroke 15
16 Four stroke engine 16
17 17
18 SUCTION STROKE Inlet is open exhaust is closed. Piston moves from TDC to BDC. Crankshaft revolves half the rotation. Cranking Petrol air mixture drawn into cylinder due to pressure difference. 18
19 COMPRESSION STROKE Both inlet and exhaust are closed. Piston moves from BDC to TDC. Crankshaft revolves half the rotation. Cranking Petrol air mixture is compressed to a ratio of 1:11. This mixture is ignited by spark plug. 19
20 POWER STROKE Piston moves from TDC to BDC. Crankshaft revolves half the rotation. burnt gases generate energy and force the piston to move down. 20
21 EXHAUST STROKE exhaust is open and inlet is closed. Piston moves from BDC to TDC. crankshaft revolves half the rotation. energy for this stroke is supplied by flywheel. Burnt gases are expelled out through outlet port. 21
22 Two stroke petrol engine Performs two strokes to complete one working cycle. Works on theoretical Otto cycle. 22
23 23
24 Parts Cylinder with one end fitted with cover and other end with a sealed crankcase. Ports are provided one below other on circumference of the cylinder. Lower one is the admission port or inlet port and upper port is the exhaust port. Transfer port diametrically opposite. 24
25 Transfer port Function transfer of petrol air mixture from crankcase to cylinder. Spark plug, connecting rod, crank. 25
26 26
27 First stroke or upward stroke Piston moves from BDC to TDC. Air fuel mixture is drawn in through inlet. Supply of petrol air mixture is cut off in upward motion of piston. Further piston will compress the petrol air mixture in cylinder. 27
28 Second stroke or downward stroke At the end of the first stroke spark plug ignites and combustion takes place, i.e. the second stroke. 28
29 six-stroke engine term six-stroke engine has been applied to a number of alternative internal combustion engine designs that attempt to improve on traditional two-stroke and fourstroke engines. Claimed advantages may include increased fuel-efficiency, reduced mechanical complexity and/or reduced emissions. Think about a normal four-stroke engine. The piston moves down to suck in air and fuel, then the fuel pushes up to compress, then the spark plug fires and the burning gas forces the piston down. Then the piston moves back up to push up the exhaust. The six-stroke engine adds two more strokes after the exhaust stroke. 29
30 The six stroke engine head uses a piston and ports very much like a two stroke engine to replace the over head valve system that is found in four stroke engines today. The four stroke block, pistons and crankshaft remain unaltered. This combination of two stroke and four stroke technology has given the engine its name the six stroke engine (2 + 4 = 6).
31 Working Principle Fuel ignites with piston at the top dead center.
32 Rotary valve opens, allowing exhaust to escape
33 Diesel Engine 33
34 S.No. Four 1. It 2. Heavy stroke engine Two stroke engine has one power stroke for It has one power stroke for every two revolutions of each revolution of the the crankshaft. crankshaft. flywheel is required and engine runs unbalanced because turning moment on the crankshaft is not even due to one power stroke for every two revolutions of the crankshaft. Lighter flywheel is required and engine runs balanced because turning moment is more even due to one power stroke for each revolution of the crankshaft. 3. Engine 4. Engine 5. More 6. is heavy Engine is light design is complicated Engine design is simple due due to valve mechanism. to absence of valve mechanism. cost. Less cost than 4 stroke. Less mechanical efficiency due More mechanical efficiency to more friction on many parts. due to less friction on a few parts. 34
35 More output due to full fresh charge intake and full burnt gases exhaust. Engine runs cooler. Engine is water cooled. Less fuel consumption and complete burning of fuel. Engine requires more space. Complicated lubricating system. Less noise is created by engine. Engine consists of inlet and exhaust valve. More thermal efficiency. It consumes less lubricating oil. Less output due to mixing of fresh charge with the hot burnt gases. Engine runs hotter. Engine is air cooled. More fuel consumption and fresh charge is mixed with exhaust gases. Engine requires less space. Simple lubricating system. More noise is created by engine. Engine consists of inlet and exhaust ports. Less thermal efficiency. It consumes more lubricating oil. Less wear and tear of moving parts. Used in cars, buses, trucks etc. More wear and tear of moving parts. Used in mopeds, scooters, motorcycles etc. 35
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