What is the largest SMD value that is required to sustain combustion.


by sgvaibhav
Tags: combustion, combustion chamber, kerosene, smd
sgvaibhav
sgvaibhav is offline
#1
Jan14-13, 12:08 PM
P: 68
Using kerosene as a fuel in a gas turbine engine.
What can be the largest SMD that the atomizers HAVE to provide for engine start-up and to sustain combustion?

SMD : Sauter Mean Diameter or also known as D32 in drop size distributions model.
Phys.Org News Partner Science news on Phys.org
SensaBubble: It's a bubble, but not as we know it (w/ video)
The hemihelix: Scientists discover a new shape using rubber bands (w/ video)
Microbes provide insights into evolution of human language
bigfooted
bigfooted is offline
#2
Jan15-13, 02:59 PM
P: 265
This is a difficult question to answer. Some guidelines: if your droplets are larger, you need a higher ignition energy. Also, you might need to adjust the ignition time, which should be probably longer.
The effective ignition energy depends on the droplet injection velocity, so the atomizer pressure. When there's premixing, a fuel lean mixture will need more ignition energy.

So, if you have an existing setup with an atomizer producing too large droplets, then increase the ignition energy. For an existing and working setup, if you increase the SMD by 10% you'll easily need 3-4 times higher ignition energy.


Register to reply

Related Discussions
Lift required to sustain a refueling jet Introductory Physics Homework 1
Sci-fi question: Would the power required to sustain a g-force during acceleration be Science Fiction & Fantasy 4
Guitar feedback INFINITE sustain? Does it really have an infinite sustain? General Physics 18
Combustion calculations and the required amount of air Chemistry 2
Rod is 1. pulled, 2. pushed horizontally. Force required to sustain constant vel.??? Introductory Physics Homework 3