Comparative Study Of Four Stroke Diesel And Petrol Engine.
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1 Comparative Study Of Four Stroke Diesel And Petrol Engine. Aim: To study the construction and working of 4- stroke petrol / diesel engine. Theory: A machine or device which derives heat from the combustion of fuel and converts part of this energy into mechanical work is called a heat engine. Heat engines are broadly classified into internal combustion engines [I.C. engines] and external combustion engines. Petrol and diesel engines fall under the category of internal combustion engines as these are reciprocating heat engines in which fuel mixed with correct amount of air is burnt inside a cylinder. The gaseous products of combustion form the working substance which make the piston move and produce mechanical work at the engine crankshaft. In contrast, the combustion of fuel in external combustion engines (ex. Steam engines) is external. Classification of I.C. Engines: I.C. engines can be classified as follows: 1. According to the number of strokes required to complete a cycle: (i) 2 stroke engine (ii) 4 stroke engine 2. According to fuel used: (i) Petrol engine (ii) Diesel engine (iii) Gas Engine 3. According to thermodynamic cycle of operation: (i) Constant volume or Otto cycle (ii) Constant Pressure or Diesel cycle (iii) Mixed or Dual cycle 4. According to the ignition system used: (i) Spark Ignition engine (ii) Compression Ignition Engine 5. According to the number of cylinders: (i) Single cylinder engine (ii) Multi Cylinder engine 6. According to arrangement of cylinders: (i) Vertical engine (ii) Horizontal engine (iii) In line engines (iv) V engines (v) Radial engine 7. According to the cooling system: (i) Air cooled engine (ii) Water cooled engine 8. According to the speed of the engine: (i) Low Speed (below 400 rpm) (ii) Medium Speed (400 to 900 rpm) (iii) High Speed (above 900 rpm) 9. According to lubrication system: (i) Splash Lubrication (ii) Pressure Lubrication 10. According to field of application: (i) Stationary engine (ii) Mobile engine.
2 Four Stroke Petrol Engine: The cycle of operation in a four stroke petrol engine is completed in two revolutions of crank shaft or four strokes of piston. Stroke is defined as the distance traveled by the piston from one of the dead centers to the other dead centre. It is also equal to two times the crank radius. Hence in a four stroke engine work is obtained only during one stroke out of the four strokes of the piston required to complete one cycle. This engine works on Otto or constant volume cycle. 1. Suction stroke: To start with the piston is at or very near T.D.C. and the inlet valve is open and exhaust valve is closed. As the piston moves from T.D.C. to B.D.C. rarefaction is formed in the cylinder which causes the charge to rush in and fill the space vacated by the piston. The charge consists of a mixture of air and petrol prepared by the carburetor. The admission of charge inside the engine cylinder continues until the inlet valve closes at B.D.C. 2. Compression stroke: Both the valves are closed and the piston moves from B.D.C. to T.D.C. The charge is compressed up to a compression ratio of 5:1 to 9:1 and pressure and temperature at the end of compression are about 6 to 12 bar and 250º C to 300º C respectively. 3. Working, Power or Expansion stroke: When the piston reaches T.D.C. position, or just at the end of compression stroke, the charge is ignited by causing an electric spark between the electrodes of a spark plug, which is located some where in the walls of cylinder head. During combustion the chemical energy of fuel is released and there is rise in temperature and pressure of gases. The temperature of gases increases to about 1800º C to 2000º C and the pressure reaches 30 to 40 bar. Up till now the volume of gases formed however remains almost constant with both valves closed. Now the combustion products expand and push the piston down the cylinder. The reciprocating piston motion is converted into rotary motion of crankshaft by a connecting rod and crank. During expansion the pressure drops due to increase in the volume of gases and absorption of heat by cylinder walls. 4. Exhaust stroke: Theoretically exhaust valve opens at the end of working stroke when the piston is at B.D.C. position. But actually exhaust valve begins to open when about 85 % of the working stroke is completed. A pressure of 4 to 5 bar at this instant forces about 60 % of the burnt gases into the exhaust manifold at high speed. The remaining burnt gases are cleared off the swept volume when the piston moves from B.D.C. to T.D.C. During this stroke the pressure in side the cylinder is slightly above the atmospheric value. Some of the burnt gases are however left in the clearance space. The exhaust valve closes shortly after the piston reaches T.D.C. The inlet valve opens slightly before the end of exhaust stroke and the cycle repeats. Four Stroke Diesel Engine: The cycle of operation in a four stroke diesel engine is completed in two revolutions of crankshaft or four strokes of piston using diesel oil as fuel. This engine works on diesel cycle. 1. Suction Stroke: Starting of engine is done by an electric motor or manually. In both cases the energy is supplied to the engine. In this stroke the inlet valve opens and the outlet valve remains closed. Piston moves from T.D.C. to B.D.C. and in this way a vacuum is created in the cylinder. This vacuum is filled by air alone and piston reaches to B.D.C. 2. Compression Stroke: Both valves are closed. This time piston moves from B.D.C. to T.D.C. Air is compressed in this stroke up to a compression ratio of 15:1 to 22:1 and a very high temperature is produced due to high pressure. The high temperature is the only cause of combustion of the fuel. The piston takes the power in this stroke from
3 the flywheel. During this stroke the pressure and temperature attain a high value of 40 to 60 bar and 600º C to 700º C. 3. Working Stroke: At the end of compression stroke or when the piston reaches the T.D.C. position, a fine spray of diesel is injected in the cylinder through injector. The fuel burns by the heat of compressed air and due to its burning the power is produced. This power pushes the piston downward i.e. from T.D.C. to B.D.C. The excess energy of the piston is stored in the flywheel of the engine, which is further used for the remaining three strokes of the engine. The reciprocating motion of the piston is converted into the rotary motion of the crankshaft by connecting rod and crank. During expansion the pressure drops due to increase in volume of gases and absorption of heat by cylinder walls. 4. Exhaust Stroke: The exhaust valve begins to open when about 85% of the working stroke is completed. The force of piston coming from B.D.C. to T.D.C. forces the burnt gases into the exhaust manifold. Some of the gases are forced out due to higher pressure in the cylinder and the remaining gases are forced out by the piston. Some of the burnt gases are however left inside the clearance space. The exhaust valve closes shortly after T.D.C. The inlet valve opens slightly before the end of exhaust and in this way the cycle repeats. Comparison between petrol and diesel engine: S. No. Criteria of comparison Petrol Engine Diesel Engine 1. Working cycle Otto Cycle Diesel cycle 2. Fuel used Petrol Diesel 3. Compression Ratio 5:1 to 9:1 14:1 to 22:1 4. Fuel Supply Carburetor is there Fuel injector is there 5. Ignition Spark plug is required Heat of compressed air 6. Pressure & temperature Lesser due to lower CR Higher due to more compression ratio 7. Weight & size Lighter & Smaller Heavier & Larger 8. Initial cost Lesser More expensive 9. Running cost More Less 10. Maintenance cost Frequent but costs less Rare but costlier 11. Thermal efficiency Lesser, about 25 to 35% More, about 40 to 50% 12. Starting effort Less cranking effort More effort required due to higher CR 13. Chances of pre-ignition More chances No chances 14. Vibration & noise Less More 15. Field of application Light duty work Heavy duty work
4 Fig. Four Stroke Petrol Engine
5 Fig. Working of 4-stroke Petrol engine
6 Fig. Four Stroke Diesel Engine
7 Fig. Working of 4-stroke Diesel engine
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