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
derive the torsion formula as (torsion divided by radius) is equal to (modulus of rigidity multiplied by twist of angle all divided by the length of a cylinder)

A semi circular frame of flexural rigidity EI is built at A and caries a vertical load W at B. calculate the magnitude of the vertical and horizontal deflection at B and hence the

AskTask 2 (3 questions) Material engineers should be conversant of various materials, their properties, manufacturing process involved, environmental issues, monetary issues and mo




Discover the maximum torque: Discover the maximum torque that may be transmitted by the shaft of 400 mm diameter, if the shear stress is not to exceed 50 N/mm 2 . Solution

how to prove that work done is a path function


Answers all questions i. Illustrate Zeroth law of thermodynamics. ii. A gas contained in a cylinder is compressed, the work neede for compression being 5000 KJ. During the pr