Exhaust stroke In this stroke the exhaust valve is open as the piston moves

Exhaust stroke in this stroke the exhaust valve is

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Exhaust stroke In this stroke, the exhaust valve is open as the piston moves from BDC to TDC. This movement of the piston pushes out the products of combustion from the engine cylinder through the exhaust valve into the atmosphere. This completes the cycle and the engine cylinder is ready to suck the fresh air again.
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Actual indicator P-V Diagram for a four stroke Cycle Diesel Engine: The suction stroke is shown by the line 1-2 which lies below the atmosphere pressure line. It is this pressure difference, which makes the fresh air to flow into the engine cylinder.
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The compression stroke is shown by the line 2-3 which shows that the inlet valves closes (IVC) a little beyond 2 (i.e. BDC). Shortly before the end of compression stroke, the fuel valve opens (FVO) and the fuel is injected into the engine cylinder, and the fuel is ignited. The ignition suddenly increases volume and temperature of the products of combustion. But pressure, practically, remains constant as shown by the line 3-4. The expansion stroke is shown by the line 4-5, in which the exit valve opens (EVO) a little before 5 (i.e. BDC). The exhaust stroke is shown by the line 5-1, which lies the above the atmospheric pressure line. It is this pressure difference, which makes the burnt gases to flow out of the engine cylinder.
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1. Indicated Horse power, 2. Break Horse power, 3. Indicated Thermal Efficient, 4. Brake Thermal efficiency(over all efficiency), 5. Mechanical Efficiency(%),
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The following observations refer to a four stroke diesel cycle engine; Mean effective pressure = 7 kg/cm 2 Fuel gas supplied = 0.1 kg/min Calorific value of the gas = 45.5 MJ/kg Stroke length = 50cm Bore = 20cm Speed = 300 rpm Brake load = 70 kg Radius of brake drum = 0.8 meter Determine of the following- (a) I.H.P. (b) B.H.P. (c) Mechanical efficiency. (d) Thermal efficiency. (e) Indicated thermal.
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  • Summer '20
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  • Internal combustion engine, Diesel engine, Electricity generation, compression ratio, Diesel Power Plant

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