Characterization of Inlet Contamination Potential
- Teresa Campos The cabin exhaust valve is located just aft
of the nose on the right fuselage. The
cabin volume of 2400 cu ft undergoes
complete turnover of fresh air in 2.8
minutes, implying about 70kL/min flow rate
exiting the cabin.
To check the potential for sampling
boundary layer air with the HIMIL, it was
proposed to release a pulse of high
concentration of CO2 at the cabin exhaust
vent and alternately sample from the HIMIL
and boundary layer ports. This exercise
was conducted during speed runs and
level flight legs. Flow was split to look for
cabin CN using this inlet.
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Characterization of Inlet Contamination Potential
Due to time and instrument performance
limitations, only one aperture location was
tested for CO2 contamination sampling
during Progressive Science: FS 498R.
Data have not been fully analyzed. Preliminary
results imply that during straight and level flight,
boundary layer air is not sampled even at the
HIMIL distance from the fuselage. However,
enhancement of CO2 above background levels
is observed at even small changes in aircraft
attack angle.
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