Vaporization of JP-8 Jet Fuel in a Simulated Aircraft Fuel Tank ...

Pressure, psia
16
14
12
10
8
6
4
2
0
P=14.56913
P= -0.00523t+32.834
P=4.896
0 2000 4000 6000 8000 10000 12000 14000
Time, seconds
P=14.579
P=0.005t-44.366
Measured Pressure
Adjusted Pressure
Figure 5.0. Measured and adjusted pressure profiles for a 10,000’ altitude flight profile test.
5.1 Validation Tests
5.1.1 Tank Mixing
Results with a dry tank test at 30,000’ altitude (4.6 psia) are displayed in figure 5.1,
showing the lower tank surface temperature and the measured ullage temperatures from
the three thermocouples located at different positions in the ullage. Similar results are
shown in figure 5.2 for a tank at sea level ambient pressure containing liquid fuel at a
loading of 31.5 kg/m 3 . The results in figures 5.1 and 5.2 are typical of all of the data and
show that all three ullage thermocouples measured about the same value or within the
measurement error of ±1°F. This confirmed that the bulk ullage gas in the test tank was
well mixed due to the turbulent natural convection within the tank.
Figures 5.3 and 5.4 show a comparison of the mean measured ullage temperature
(average of the three ullage thermocouple measurements) with the ullage temperature
predicted by the model in ref [11]. The good agreement, within approximately 2%,
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