Development and characterization of a high-efficiency, aircraft-based axial cyclone cloud water collector.

Autor: Crosbie E; NASA Langley Research Center, Hampton, VA 23666, USA.; Science Systems and Applications, Inc. Hampton, VA 23666, USA., Brown MD; NASA Langley Research Center, Hampton, VA 23666, USA.; Universities Space Research Association, Columbia, MD 21046, USA., Shook M; NASA Langley Research Center, Hampton, VA 23666, USA., Ziemba L; NASA Langley Research Center, Hampton, VA 23666, USA., Moore RH; NASA Langley Research Center, Hampton, VA 23666, USA., Shingler T; NASA Langley Research Center, Hampton, VA 23666, USA.; Science Systems and Applications, Inc. Hampton, VA 23666, USA., Winstead E; NASA Langley Research Center, Hampton, VA 23666, USA.; Science Systems and Applications, Inc. Hampton, VA 23666, USA., Lee Thornhill K; NASA Langley Research Center, Hampton, VA 23666, USA.; Science Systems and Applications, Inc. Hampton, VA 23666, USA., Robinson C; NASA Langley Research Center, Hampton, VA 23666, USA.; Science Systems and Applications, Inc. Hampton, VA 23666, USA., MacDonald AB; Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ 85721, USA., Dadashazar H; Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ 85721, USA., Sorooshian A; Department of Chemical and Environmental Engineering, University of Arizona, Tucson, AZ 85721, USA.; Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ 85721, USA., Beyersdorf A; Department of Chemistry and Biochemistry, California State University, San Bernardino, CA 92407, USA., Eugene A; Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA., Collett J Jr; Atmospheric Science Department, Colorado State University, Fort Collins, CO 80523, USA., Straub D; Department of Earth and Environmental Sciences, Susquehanna University, Selinsgrove, PA 17870, USA., Anderson B; NASA Langley Research Center, Hampton, VA 23666, USA.
Jazyk: angličtina
Zdroj: Atmospheric measurement techniques [Atmos Meas Tech] 2018 Aug 31; Vol. 11 (9), pp. 5025-5048. Date of Electronic Publication: 2018 Sep 05.
DOI: 10.5194/amt-11-5025-2018
Abstrakt: A new aircraft-mounted probe for collecting samples of cloud water has been designed, fabricated, and extensively tested. Following previous designs, the probe uses inertial separation to remove cloud droplets from the airstream, which are subsequently collected and stored for offline analysis. We report details of the design, operation, and modelled and measured probe performance. Computational fluid dynamics (CFD) was used to understand the flow patterns around the complex interior geometrical features that were optimized to ensure efficient droplet capture. CFD simulations coupled with particle tracking and multiphase surface transport modelling provide detailed estimates of the probe performance across the entire range of flight operating conditions and sampling scenarios. Physical operation of the probe was tested on a Lockheed C-130 Hercules (fuselage mounted) and de Havilland Twin Otter (wing pylon mounted) during three airborne field campaigns. During C-130 flights on the final field campaign, the probe reflected the most developed version of the design and a median cloud water collection rate of 4.5 mL min -1 was achieved. This allowed samples to be collected over 1-2 min under optimal cloud conditions. Flights on the Twin Otter featured an inter-comparison of the new probe with a slotted-rod collector, which has an extensive airborne campaign legacy. Comparison of trace species concentrations showed good agreement between collection techniques, with absolute concentrations of most major ions agreeing within 30 %, over a range of several orders of magnitude.
Competing Interests: Competing interests. The authors declare that they have no conflict of interest.
Databáze: MEDLINE
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