What are the three stages of combustion in SI engine?

On the basis of Recardo experiment, there are three stages of combustion in SI engine as given below: Preparation phase. Flame propagation phase….

• Preparation Phase. The preparation phase is also called a period of ignition lag.
• Flame Propagation Phase.
• After Burning.

What is abnormal combustion in SI engine?

But in this downsized engine, abnormal combustion, which occurs under the condition of low speed and high intake pressure, is a serious problem. It has been referred to as Super Knock, Mega Knock or Low Speed Pre-Ignition (LSPI). In this paper, we use the term Super Knock.

What is the normal combustion and abnormal combustion in SI engine?

Normal combustion spark-ignited flame moves steadily across the combustion chamber until the charge is fully consumed. Abnormal combustion fuel composition, engine design and operating parameters, combustion chamber deposits may prevent occuring of the normal combustion process.

What is the combustion in spark ignition engine?

In a spark ignition engine, the fuel is mixed with air and then inducted into the cylinder during the intake process. After the piston compresses the fuel-air mixture, the spark ignites it, causing combustion. The expansion of the combustion gases pushes the piston during the power stroke.

What is the combustion process in a Si engine?

Combustion In SI Engines. The combustion process of SI engines can be divided into three broad regions: (1)ignition and flame development, (2) flame propagation, and (3) flame termination. Flame development is generally considered the consumption of the first 5% of the air-fuel mixture (some sources use the first 10%). COMBUSTION IN SI ENGINES.

Where does flame development occur in a Si engine?

Flame development is generally considered the consumption of the first 5% of the air-fuel mixture (some sources use the first 10%). The combustion process of SI engines can be divided into three broad regions: (1)ignition and flame development, (2) flame propagation, and (3) flame termination.

What are the stages of combustion in an IC engine?

This combustion process in an IC engine takes place in a homogeneous mixture or heterogeneous mixture based on the type of engine. In this article, we are going to discuss the Different Stages of combustion in SI engine. In a thermodynamic cycle, we have the suction, compression, combustion, expansion and exhaust processes.

What is the AB period of a Si engine?

During the AB period, the angle changed by the crank between points A and B is known as the ignition delay angle. This first phase or preparation phase in stages of combustion in SI engines depends upon the different factors such as the temperature of fuel, pressure, molecular structure of fuel, density and air-fuel ratio in the combustion chamber.