Four stroke engine - thermodynamics, Mechanical Engineering

Four Stroke Engine - thermodynamics:

Figure given below shows the working of a four stroke engine. During suction stroke only air (in case of diesel engine) or air with petrol (in case of petrol engine) is drawn into the cylinder by the moving piston.

1503_Four Stroke Engine.png

The charge enters the engine cylinder through the inlet valve that is open. During this stroke, the exhaust valve is closed. At the time of the compression stroke, charge is compressed in clearance space. On the finishing point of compression, if only air is taken in during the suction stroke, fuel is injected into engine cylinders at the end of compression. The mixture is then ignited and the heat is generated, while piston is stationary, sets up high pressure. During the power stroke, piston is forced downward by high pressure. This is the important stroke of the cycle. At the time of the exhaust stroke the products of combustion are swept out through open exhaust valve while piston returns. It is scavenging stroke. The burnt gases are entirely removed from the engine cylinder and cylinder is ready to receive fresh charge for the new cycle.

Therefore, in four-stroke engine there is one power stroke and 3 idle strokes. The power stroke supplies the required momentum to keep the engine running.

Posted Date: 10/15/2012 4:27:48 AM | Location : United States







Related Discussions:- Four stroke engine - thermodynamics, Assignment Help, Ask Question on Four stroke engine - thermodynamics, Get Answer, Expert's Help, Four stroke engine - thermodynamics Discussions

Write discussion on Four stroke engine - thermodynamics
Your posts are moderated
Related Questions
Q. What is Squeeze time? It is the time between the initial application of the electrode pressure on the work and the initial application of current to make the weld. During th

The stepped bar in Fig Q6 is stretched along the vertical axis and the maximum upward displacement is found to be 0.008 m. The bar has cross-sectional areas of A 1 and A 2 ov

Define the Disadvantages of Abrasive Jet Cutting Machines Slow material removal rate. Stray cutting and hence accuracy is not good. Abrasive powder cannot be reused

proportional controller for lube oil temperature of engine working diagram


Information Dissemination The purpose of record keeping is best served if information is timely disseminated. The employees are required to be informed on all health issues co



Diffrence between external diameter and internal diameter: A compound tube is built by shrinking one tube on another, the ultimate dimension being, 80 mm internal diameter, 16

Fuel Feed System: Fuel feed system is provided to serve the air fuel mixture to the engine in an appropriate ratio so that it can burn efficiently and transmit power to crank shaf