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ANSWER TO QUESTIONS in Page 25:
1
...
How does flame height change for increased jet flow rate?
They are directly proportional
...
How does replacing methane with propane affect the burner design assuming the total burner
power remains the same?
This effect is generally known as the stoichiometry effect and the effect is as follows:
With the increase of flame length, all design factors will change like nozzle velocity, the fuel/air ratio
and other factors
...
What is the effect of aeration with oxygen rather than air?
Note that replacing air with oxygen is essentially the same as increasing the mole ratio of oxygen from
around 0
...
00 (pure oxygen)
...
Jet Flame Physical Description
> As the fuel flows along the flame axis, it diffuses radially outward, while the oxidizer diffuses radially
inward
...
HISTORICAL THEORETICAL FORMULATIONS:
i
...
Roper (1977)
- Relaxed single constant velocity assumption
- Provides extremely good predictions
- Matched by experimental results/correlations
- Round and slot-burners
The figure above correlates the volumetric flow rate of the fuel and flame length
...
The
main difference among the different nozzle types is just the slope of the ‘almost’ straight line that
relates fuel flowrate and flame length
...
The graph above shows the effect of primary aeration and can be explained as follows: