This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Measurement of Liquid Water Content for Supercooled Large Drop Conditions in the NRC’s Altitude Icing Wind Tunnel
Technical Paper
2019-01-2007
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
As a result of new regulations pertaining to the airworthiness of aircraft exposed to in-flight icing conditions where maximum water drop size is greater than 100 microns (referred to as Supercooled Large Droplet (SLD) conditions), updates are required to the test facilities and simulations that will enable manufactures to certify their products under these new rules. While a number of facilities report achieving some of the conditions specified in the new regulations, questions remain as to the suitability of the instrumentation used to measure the Liquid Water Content (LWC) and drop size distributions of the SLD icing cloud. This study aims to provide baseline LWC data through ice accretion measurement techniques on a NACA 0012 airfoil and rotating cylinders of varying diameters. This forms part of a collaborative effort between the NRC, NASA Glenn and the Italian Aerospace Research Centre (CIRA), to examine the suitability of current instruments in accurately measuring LWC in clouds where SLD conditions are present.
Calculation of LWC’s from leading edge airfoil ice thickness measurements on the NACA 0012 airfoil were within ±10% of the tunnel LWC setting over the full range of MVD’s tested (20μm to over 300μm). When using rotating cylinders of varying size to measure LWC, it was found that smaller diameter cylinders underestimated LWC of icing clouds containing larger drop diameters compared to the tunnel setting whereas LWC measurement from larger cylinders provided values within 10% of the tunnel setting across the range of MVD’s tested.
Recommended Content
| Technical Paper | Recent Advances in the LEWICE Icing Model |
| Technical Paper | Numerical Demonstration of the Humidity Effect in Engine Icing |
| Technical Paper | Experimental Study and Analysis of Ice Crystal Accretion on a Gas Turbine Compressor Stator Vane |
Authors
Citation
Orchard, D., Clark, C., and Chevrette, G., "Measurement of Liquid Water Content for Supercooled Large Drop Conditions in the NRC’s Altitude Icing Wind Tunnel," SAE Technical Paper 2019-01-2007, 2019, https://doi.org/10.4271/2019-01-2007.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 |
Also In
References
- Federal Aviation Administration 2014
- National Transportation Safety Board 1994
- Miller , D. , Ratvasky , T. , Bernstein , B. , McDonough , F. et al. NASA/FAA/NCAR Supercooled Large Droplet Icing Flight Research: Summary of Winter 96-97 Flight Operations Proc. AIAA 36th Aerospace and Science Meeting and Exhibit Reno, NV 1997
- Curry , J.A. , Hobbs , P.V. , King , M.D. , Randall , D.A. et al. FIRE Arctic Clouds Experiment Bulletin of the American Meteorological Society 81 5 29 2000
- Cober , S.G. , Isaac , G.A. , and Strapp , J.W. Characterisation of Aircraft Icing Environments that Include Supercooled Large Drops Journal of Applied Meteorology 40 1984-2002
- Isaac , G.A. , Cober , S.G. , Strapp , J.W. , Korolev , A.V. et al. Recent Canadian Research on Aircraft In-Flight Icing Canadian Aeronautics and Space Journal 47 3 2001
- Isaac , G.A. , Cober , S.G. , Strapp , J.W. , Hudak , D. et al. Preliminary Results from the Alliance Icing Research Study (AIRS) Proc. AIAA 39th Aerospace and Science Meeting and Exhibit Reno, NV 2001
- Federal Aviation Administration 2014
- Oleskiw , M.M. , Hyde , F.H. , and Penna , P.J. In-Flight Icing Simulation Capabilities of NRC’s Altitude Icing Wind Tunnel Proc. AIAA 39th Aerospace and Science Meeting and Exhibit Reno, NV 2001
- Society of Automotive Engineers (SAE) AIR 5666A 2018
- Anderson , D.N. 2004
- Stallabrass , J.R. 1978
- Langmuir , I. and Blodgett , K.B. 1946
- Lozowski , E.P. , Stallabrass , J.R. , and Hearty , P.F. The Icing of an Unheated, Nonrotating Cylinder. Part I: A Simulation Model J. Climate Appl. Meteor 22 2053 2062 1984
- Ludlam , F.H. The Heat Economy of a Rimed Cylinder Quart. Journal of Royal Meteorological Society 77 663 666 1951