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Objectives: Quantify thermal effects on composite blades

Dr. Charles C. Ryerson. Objectives: Quantify thermal effects on composite blades Evaluate efficiency and limitations of infrared, hot air and hot water deicing technologies. Purpose:

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Objectives: Quantify thermal effects on composite blades

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  1. Dr. Charles C. Ryerson • Objectives: • Quantify thermal effects on composite blades • Evaluate efficiency and limitations of infrared, • hot air and hot water deicing technologies Purpose: Reduce 1- to 4-hour deicing times per helicopter and improve current labor-intensive, inefficient, and potentially damaging deicing techniques.

  2. Results • Infrared: rapid, 15-25 min for entire aircraft, but • could overheat composite blades. Temperature • sensor recommended • Hot water: effectively deices entire aircraft in • 35-45 min, but allows water to refreeze • Hot air: very portable, and deices aircraft in • ~ 90 min, but could overheat composite blades. • Temperature sensor recommended • Ice imager: assessed deicing effectiveness well for • clear ice and snow • Current work: thermal cycling effects on composites, • partnering with Air Force in FY01

  3. ASOS Quantitative Ice Accretion ASOS Quantitative Ice Accretion Interagency research team: U.S. Army Cold Regions Research and Engineering Laboratory National Weather Service ASOS Program Office Principal Investigators: Charles Ryerson, CRREL Alan Ramsay, NWS Purpose: Improve ASOS ice reporting capability to provide hourly ice amount, improve icing forecasts and to assist aircraft deicing activity. Objective: Research Completed: Develop algorithms and rules allowing the Automated Surface Observing System (ASOS) to report ice accumulated hourly during freezing rain events. Icing observed at six locations for four years Icing algorithms completed Icing reporting requirement developed by NWS METAR remark for ice amount accepted About 1000 ASOSs nationwide, and ~600 have ice detectors Ice accretes on vertical sensor of Rosemount ice detector

  4. Ice accreted on the rods was weighed and compared to ice detector net frequency change The relationship suggests that net frequency change is an excellent predictor of accumulated ice mass. Icing Remark ASOS icing remarks will be reported hourly, 3-hourly and 6-hourly. Remark format will be of the following form: Itnnn "I" is the icing group indicator "t" is the reporting time period in hours "nnn" is ice thickness accumulated to nearest 0.01 inch during period Measured versus predicted ice mass at Johnstown, PA, 13-14 November, 1997.

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