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Analysis of Supercooled Large Drop Velocity Measurement in the NASA Icing Research Tunnel An experiment was conducted in the Icing Research Tunnel (IRT) at the NASA Glenn Research Center to measure the velocity of supercooled large drops (SLD) in the test section of the tunnel. Previous experiments in the IRT suggested that supercooled large drops passing through the test section of the tunnel do not move at the same velocity as the surrounding air flow. The difference between drop velocity and tunnel air velocity is called slip velocity. The slip velocity is important for determining the exact nature of SLD icing simulation in the IRT. It can impact the ice growth process because of its effect on drop cooling rate during transit from the spray bars to the test section. It can also affect the amount of splashing that occurs upon impact. Slip velocity is an important flow parameter to determine how far the current facility capabilities can be extended into the SLD regime. Initial measurement data analysis of the drop velocities indicates that drops with diameter larger than about 100 to 200 µm experience velocity slip.
Document ID
Acquisition Source
Glenn Research Center
Document Type
Jen-Ching Tsao
(Ohio Aerospace Institute Cleveland, Ohio, United States)
Mario Vargas
(Glenn Research Center Cleveland, Ohio, United States)
Zaid Sabri
(Glenn Research Center Cleveland, Ohio, United States)
Eric Insana
(Glenn Research Center Cleveland, Ohio, United States)
Eric Stewart
(Naval Air Systems Command Lexington Park, Maryland, United States)
Emily Timko
(Jacobs (United States) Dallas, Texas, United States)
Gregory Payne
(Artium Technologies (United States) Sunnyvale, California, United States)
Date Acquired
March 15, 2023
Subject Category
Aeronautics (General)
Aircraft Design, Testing and Performance
Meeting Information
Meeting: International Conference on Icing of Aircraft, Engines, and Structures
Location: Vienna
Country: AT
Start Date: June 20, 2023
End Date: June 22, 2023
Sponsors: Society of Automotive Engineers International
Funding Number(s)
WBS: 951888.
Distribution Limits
Public Use Permitted.
Technical Review
Single Expert
Drop slip velocity
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