Table of Contents
How can I improve my turbulence?
Turbulence is increase with speed of an engine up to certain limit. You can increase turbulence via change in design of inlet and exhaust valve position. You can increase turbulence via setting injecting timing and pressure also.
How can combustion chambers increase turbulence?
The turbulence inside the cylinder and head mainly helps to maintain the air-fuel mixture in a gaseous state and prevent condensation of fuel droplets preventing erratic and incomplete combustion. In recent times the most accepted practice to create turbulence is to provide squish bands in the combustion chamber.
Why is it important for turbulence to be created within the combustion chamber?
Combustion Chamber Design Designers can make use of air motion turbulence at the piston and cylinder wall to prevent fuel impingement upon the wall and piston top. Piston top structures like cavities are used to help deflect the fuel spray and evenly distribute the fuel within cylinder.
What is known as a turbulent combustion chamber?
Inside a combustion chamber, an unsteady three-dimensional flow occurs, known as turbulent flow. This turbulence, plus the chemistry of various fuels combusting, makes for very complex phenomena.
What are the stages of combustion in spark ignition engine?
Stages of combustion in spark ignition engine. There are 3 stages of combustion ignition lag, flame propagation, after burning.
What is delay period in SI engine?
Explanation: Delay period is defined as the time immediately following injection of the fuel during which the ignition process is being initiated and the pressure does not rise beyond the value it would have due to compression of air.
What is swirl and turbulence?
There can be an ordered air motion such as swirl, but always present is turbulence. When the air motion rotates about an axis normal to the cylinder axis (this is usually parallel to the cylinder axis), the motion is known as barrel swirl or tumble.
What are the 3 stages of combustion?
Based on the experimental results the combustion in SI engines takes place in three stages as follows:
- Period of ignition Lag Or preparation phase.
- Flame propagation phase.
- after burning or flame termination phase.
What are the three factors of engine good combustion?
Three things are required in proper combination before ignition and combustion can take place—Heat, Oxygen and Fuel.
- There must be Fuel to burn.
- There must be Air to supply oxygen.
- There must be Heat (ignition temperature) to start and continue the combustion process.
What are the factors that affect the delay period?
Engine operating variables such as speed and load affect the ignition delay because they change the primary factors such as injection pressure, compression temperature, pressure and air velocity. It has been found that under normal running conditions, compression temperature and pressure are the major factors.