NASA LogoNTRSNTRS - NASA Technical Reports ServerSearchmore_vertCollectionsAboutNewsHelpLogin Back to ResultsAdditional Results of Glaze Icing Scaling in SLD ConditionsNew guidance of acceptable means of compliance with the super-cooled large drops (SLD) conditions has been issued by the U.S. Department of Transportation's Federal Aviation Administration (FAA) in its Advisory Circular AC 25-28 in November 2014. The Part 25, Appendix O is developed to define a representative icing environment for super-cooled large drops. Super-cooled large drops, which include freezing drizzle and freezing rain conditions, are not included in Appendix C. This paper reports results from recent glaze icing scaling tests conducted in NASA Glenn Icing Research Tunnel (IRT) to evaluate how well the scaling methods recommended for Appendix C conditions might apply to SLD conditions. The models were straight NACA 0012 wing sections. The reference model had a chord of 72 in. and the scale model had a chord of 21 in. Reference tests were run with airspeeds of 100 and 130.3 kn and with MVD's of 85 and 170 micron. Two scaling methods were considered. One was based on the modified Ruff method with scale velocity found by matching the Weber number WeL. The other was proposed and developed by Feo specifically for strong glaze icing conditions, in which the scale liquid water content and velocity were found by matching reference and scale values of the nondimensional water-film thickness expression and the film Weber number Wef. All tests were conducted at 0 deg AOA. Results will be presented for stagnation freezing fractions of 0.2 and 0.3. For nondimensional reference and scale ice shape comparison, a new post-scanning ice shape digitization procedure was developed for extracting 2-D ice shape profiles at any selected span-wise location from the high fidelity 3-D scanned ice shapes obtained in the IRT.Document ID20160010495Acquisition SourceGlenn Research CenterDocument TypeContractor Report (CR)AuthorsTsao, Jen-Ching*(Ohio Aerospace Inst. Brook Park, OH, United States)*Date AcquiredAugust 22, 2016Publication DateAugust 1, 2016Subject CategoryAerodynamicsReport/Patent NumberAIAA Paper 2016-3278GRC-E-DAA-TN33583E-19255NASA/CR-2016-219131Meeting InformationMeeting: Atmospheric and Space Environments ConferenceLocation: Washington, DCCountry: United StatesStart Date: June 13, 2016End Date: June 17, 2016Sponsors:American Inst. of Aeronautics and AstronauticsFunding Number(s)CONTRACT_GRANT: NCC13BA10BWBS: WBS 081876.02.03.08.02.02Distribution LimitsPublicCopyrightPublic Use Permitted.KeywordsSLDIcingScalingAvailable DownloadsNameType20160010495.pdfSTIcloud_downloadcontent_copyvisibilityRelated RecordsIDRelationTitle20170000247See AlsoAdditional Results of Glaze Icing Scaling in SLD Conditions20170001729See AlsoAdditional Results of Glaze Icing Scaling in SLD Conditionsvisibility_offNo Preview Available
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