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Novel Aerosol/Gas Inlet for Aircraft-Based Measurements

Dhaniyala, Suresh and Flagan, Richard C. and McKinney, Karena A. and Wennberg, Paul O. (2003) Novel Aerosol/Gas Inlet for Aircraft-Based Measurements. Aerosol Science and Technology, 37 (10). pp. 828-840. ISSN 0278-6826. doi:10.1080/02786820300937.

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A novel inlet has been designed for selective sampling of gas and aerosol phases of volatile species from high-speed aircraft. A multistage flow system brings the flow nearly isokinetically towards the sampling port. Two small airfoil-shaped "blades" are placed close to the sample port to provide the flow conditions required for aerosol and gas sampling. Aerosols are sampled when these blades are positioned to operate the inlet as a counterflow virtual impactor (CVI). The design enables sampling of particles as small as 0.1 w m from a high-speed aircraft under stratospheric conditions, a substantial improvement over that possible with previous CVI designs. For gas sampling, one of the blades is moved by a stepper motor to occlude the inlet opening and gas is sampled perpendicular to the bulk flow. Boundary layer suction is used to prevent the sampled gas from coming in contact with the impactor walls. This is one of the first designs of an inlet that enables gas sampling free of wall contact. The inlet was flown on the NASA ER-2 aircraft during the SOLVE 2000 campaign to study aerosol/gas partitioning of nitric acid in the lower stratosphere. Data from the flight tests show that the inlet flow characteristics are broadly in agreement with computational fluid dynamics (CFD) simulations.

Item Type:Article
Related URLs:
URLURL TypeDescription
Flagan, Richard C.0000-0001-5690-770X
McKinney, Karena A.0000-0003-1129-1678
Wennberg, Paul O.0000-0002-6126-3854
Additional Information:© 2003 American Association for Aerosol Research. Received 18 July 2002; accepted 27 March 2003. The authors would like to thank Fred Eisele, Nate Hazen, Jim Oliver, and Dave Tanner for their help in designing the inlet and Joe Haggerty for his expertise in fabricating the different inlet components. We would also like to thank Prof. Hans G. Hornung for valuable discussions about the inlet flow. We gratefully acknowledge the funding support of NASA (NAG5-7527) and NSF (ATM-9871353) for this project. POW also acknowledges funds provided by the Powell foundation.
Funding AgencyGrant Number
Charles Lee Powell FoundationUNSPECIFIED
Issue or Number:10
Record Number:CaltechAUTHORS:20150818-101521762
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59699
Deposited By: Irina Meininger
Deposited On:20 Aug 2015 19:08
Last Modified:10 Nov 2021 22:24

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