Understanding Spillage vs. Mach Number

[roldy]

Could someone help me clear my understanding of spillage? I need to plot spillage vs. Mach number at for different fuel flow rates. It's defined in this problem that full mass capture is when Mach=0.8, fuel flow rate=.2506 kg/s.

The other Mach number's are based on the other fuel flow rates of .1, .2, .3, .4, .5, .6, .7 kg/s.
Spillage=$$\dot{m}_{\text{fuel, full mass capture}} - \dot{m}_{air}$$

My understanding:
Take the mass capture of air at Mach=.8 for on design and subtract off the mass capture of air for all other Mach number's.

Is my understanding correct? When I plot the points for the different fuel flow rates, should I expect to see one point where spillage=0 (where Mach=.8 and fuel flow rate=.2506 kg/s)?

 

[Navin A S]

Yes, your understanding is correct. When you plot the points for the different fuel flow rates, you should expect to see one point where spillage=0 (where Mach=.8 and fuel flow rate=.2506 kg/s). The other points should show the difference between the mass capture of air at Mach=.8 and the mass capture of air at the other Mach numbers.