What is the main purpose of the exhaust stroke in an internal-combustion engine?

The purpose of the exhaust stroke is to clear the cylinder of the spent exhaust in preparation for another ignition cycle. The exhaust stroke begins at Stage 6 as the piston is pushed towards the combustion chamber (to the right in the figure).

What is suction stroke?

Definition of suction stroke : the stroke of the piston in an internal-combustion engine that effects the drawing in of the gaseous mixture to the engine cylinder.

Which stroke for a 4 stroke IC engine is considered as the working or power stroke?

Combustion: Also known as power or ignition. This is the start of the second revolution of the four stroke cycle. At this point the crankshaft has completed a full 360 degree revolution. While the piston is at T.D.C.

What is the position of the suction and discharge valves when the piston is at top dead center?

Working of Reciprocating Compressor From the top dead center position the piston starts moving towards the downward direction. At this instance the discharge valve is already closed, while the suction valve opens due to suction pressure of the refrigerant from the suction pipeline.

What happened during exhaust stroke?

The exhaust stroke is the final phase in a four stroke engine. In this phase, the piston moves upwards, squeezing out the gasses that were created during the combustion stroke. The gasses exit the cylinder through an exhaust valve at the top of the cylinder.

What happened to the exhaust valve during exhaust stroke?

As the intake valve opens in the exhaust stroke, a portion of exhaust gas enters the intake port and will be sucked back into the cylinder in the intake stroke. The exhaust valve closes after TDC so that some exhaust gas will also be sucked back into cylinder.

What is the use of an exhaust valve in a four stroke cycle diesel engine?

Fuel Chemistry At the top of the stroke, the spark plug ignites the mixture. During the expansion or power stroke, the high-pressure combustion gases expand moving the piston down and delivering the power. The gases expand completely, the exhaust valve opens, and the gases are expelled out during the exhaust stroke.

Why is the exhaust valve on a four cycle engine opened well before the power stroke is completed?

On the power stroke, the combustion pushes the piston down in the cylinder. During this stroke, it is necessary to open the exhaust valve before the piston gets to the bottom of the cylinder. This will allow the excess pressure in the cylinder to “vent out” just before the piston reaches the bottom of the stroke.

What happens to the intake valve during the intake stroke?

Intake stroke: the intake stroke draws air and fuel into the combustion chamber. When the inlet valve opens, atmospheric pressure forces the air-fuel charge into the evacuated chamber. As a result, the combustible mixture of fuel and air fills the chamber.

What is the effect of the exhaust gas to the environment?

Emissions of greenhouse gases from combustion of fossil fuels are associated with the global warming of Earth’s climate. Certain air pollutants, including black carbon, not only contribute to global warming, but are also suspected of having immediate effect on regional climates.

What is the purpose of the exhaust stroke in an engine?

The exhaust valve is then opened to begin the exhaust stroke. The purpose of the exhaust stroke is to clear the cylinder of the spent exhaust in preparation for another ignition cycle. The exhaust stroke begins at Stage 6 as the piston is pushed towards the combustion chamber (to the right in the figure).

How does a four stroke engine work?

Four Stroke Engine A four-stroke engine is an internal combustion engine that utilizes four distinct piston strokes (intake, compression, power, and exhaust) to complete one operating cycle. A complete operation in a four-stroke engine requires two revolutions (720 0) of the crankshaft. Parts of a Four Stroke Engine

What happens during the intake stroke of a diesel engine?

During the intake stroke, the fuel and air mixture is drawn into the cylinder with the exhaust valve closed. Then the air and fuel mixture is compressed in a compression stroke. At the top of the stroke, the spark plug ignites the mixture.

What is the pressure and temperature ratio during the exhaust stroke?

The random motion of the gas causes to exit the combustion chamber and cylinder as the volume is decreased by the piston motion. The pressure and temperature ratios are both 1.0 during the exhaust stroke. Navigation..