NASA Glenn Icing Research Tunnel: 2024 Cloud Calibration Procedure and Results

The NASA Glenn Research Center 2024 Icing Research Tunnel cloud calibration results are presented in this report. The current status of the cloud uniformity, liquid water content, and dropsize calibration results will be discussed. The goals achieved in this calibration were to establish a uniform cloud and to generate transfer functions from the inputs of airspeed, spray bar atomizing air pressure, and spray bar water pressure to the outputs of median volumetric diameter (dropsize distributions) and liquid water content. This was completed for both Federal Aviation Administration (FAA) 14 CFR Parts 25 and 29, Appendix C and some Appendix O (supercooled large drop) conditions. The cloud uniformity from the Standard nozzles has remained the same as was reported for the 2019 full calibration. Changes were made to the Mod1 nozzle cloud to optimize uniformity while also maintaining water content values established in the 2019 full cloud calibration.