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The HALO Submicrometer Aerosol Inlet (HASI): Design concept and first characterization

Minikin, Andreas and Sauer, Daniel and Ibrahim, Amir and Franke, Harald and Röschenthaler, Timo and Fütterer, Daniel Alexander and Petzold, Andreas (2017) The HALO Submicrometer Aerosol Inlet (HASI): Design concept and first characterization. 1st HALO symposium: Airborne Research with HALO: Achievements and Prospects, 2017-03-14 - 2017-03-16, Oberpfaffenhofen, Deutschland. (Unpublished)

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The HALO Submicrometer Aerosol Inlet (HASI) was specifically designed for HALO with the aim to provide up to 30 l/min sample air flow (divided over four forward facing sample lines) to aerosol instruments mounted inside the aircraft cabin. HASI samples the air on the top of the fuselage outside of the aircraft boundary layer. The air stream is aligned in the inlet and deaccelerated in three stages by roughly a factor of 40 using a front shroud, a main diffusor and smaller diffusers at the tips of four sample tubes which protrude into the deaccelerated air stream. In addition, there is a backward-facing sample tube installed for optional use. The design concept is to allow regulating the sample air flow in each of the four forward-facing sample lines to achieve isokinetic sampling conditions according to the actual speed of the aircraft. Pumps and bypass lines for regulation of the air flow are part of the Aerosol Measurement System (AMETYST) cabin rack on HALO operated by DLR. The geometric design of the inlet should prevent large cloud droplets and ice crystals from entering the sample lines directly. Judging from the first measurements of different instruments using HASI during the ML-CIRRUS and ACRIDICON-CHUVA missions with HALO, it appears that condensation particle counter (CPC) measurements of interstitial aerosol in liquid clouds are affected by artefacts while in ice clouds there is no indication of any measurement problem. Selected examples of other measurement results for initial experimental characterization of the inlet will be discussed. In order to achieve better isokinetic sampling, further numerical flow simulations of the final inlet design for different aircraft altitudes and speeds are required to establish a final regulation of the sample air flow in each of the four sample lines based on pressure and temperature sensors in the inlet and aircraft data.

Item URL in elib:https://elib.dlr.de/116282/
Document Type:Conference or Workshop Item (Poster)
Title:The HALO Submicrometer Aerosol Inlet (HASI): Design concept and first characterization
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Minikin, AndreasUNSPECIFIEDhttps://orcid.org/0000-0003-0999-4657UNSPECIFIED
Sauer, Danieldlr, ipahttps://orcid.org/0000-0002-0317-5063UNSPECIFIED
Röschenthaler, Timoenviscope GmbHUNSPECIFIEDUNSPECIFIED
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:HALO, HASI, aerosol, ML-CIRRUS, particle, inlet
Event Title:1st HALO symposium: Airborne Research with HALO: Achievements and Prospects
Event Location:Oberpfaffenhofen, Deutschland
Event Type:international Conference
Event Start Date:14 March 2017
Event End Date:16 March 2017
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignment
DLR - Research theme (Project):L - no assignment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Flight Experiments > Oberpfaffenhofen
Deposited By: Minikin, Dr.rer.nat. Andreas
Deposited On:29 Nov 2017 13:22
Last Modified:24 Apr 2024 20:20

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