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Inlet Contamination Study for Aircraft Cabin Exhaust Valve

Research on sampling boundary layer air for cabin contamination using CO2 release and HIMIL sampling during flight operations. Initial testing results and implications.

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Inlet Contamination Study for Aircraft Cabin Exhaust Valve

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  1. 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.

  2. 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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