Indicator Diagram or P.V Diagram (Actual) for a Two-Stroke Cycle Diesel Engines

Indicator Diagram or P.V Diagram (Actual) for a Two-Stroke Cycle Diesel Engines Points : Indicator Diagram or P.V Diagram (Actual) for a Two-Stroke Cycle Diesel Engines Shows the indicator diagram of a two- stroke cycle diagram of a two-stroke cycle diagram of a two stroke cycle diesel engine. The suction in shown by the line l-2-3 (i.e from the instant inlet port opens and inlet port closes).
We know that during the suction stage, the exhaust port is also opens In the first half of suction stage, the volume of air and burnt gases increases. This happens as the piston moves from 1-2 (i.e. BDC). In the second half of the suction stage, the volume of air and burnt gases decreases. This happens as the piston moves upwards from 2.3. A little beyond 3, the exhaust port V - closes (EPC) at 4. Now the air inside the engine cylinder is compressed which is shown by line 4-5. At the end of compression, there is an increase in the pressure inside the engine cylinder shortly before the end of compression (i.e.TDC) fuel valve open (FVO) and the fuel is injected into the engine cylinder. The fuel is ignited by high temperature of the compressed air. The ignition suddenly increases volume and temperature of the products of combustion. But the pressure, practically, remains constant as shown by the line 5-6. The expansion is shown by the lines 6-7, Now the exhaust port opens (EPO) at 7, and the burnt gases are exhausted into the atmosphere through the exit valve. It reduces the pressure. As the piston is moving towards BDC, therefore volume of burnt gases

increases from 7 to I. At 1, the inlet port opens (IPO) and the suction starts.