Fundamental study of mixed-phase icing with application to ice crystal accretion in aircraft jet engines

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Proceedings title4th AIAA Atmospheric and Space Environments Conference 2012
Conference4th AIAA Atmospheric and Space Environments Conference 2012, June 25-28, 2012, New Orleans, LA, USA
Pages523539; # of pages: 17
SubjectAircraft jet engines; Evaporative cooling; Fundamental studies; Ice water content; National Research Council of Canada; Nonlinear functions; Total temperatures; Wet bulb temperature; Airfoils; Atmospheric humidity; Atmospheric temperature; Deposits; Evaporative cooling systems; Functions; Jet engines; Ice
AbstractThis paper describes experiments performed in an altitude chamber at the National Research Council of Canada (NRC) as the first phase of a joint NRC/NASA program investigating ice crystal accretion in aero engines. The principal objective was to explore the effect of wet bulb temperature Twb (dependent on air temperature, humidity and pressure) on accretion behavior, since preliminary results published in an earlier paper indicated that well-adhered accretions are only possible at Twb<0°C, when water in an impinging mixedphase flow can freeze to a surface. To assess the accretion sensitivity to Twb, the symmetrical airfoil used in the previous work was tested at pressures of 44.8 kPa and 93kPa, usually at 0.25 Mach number, over a range of freestream liquid water and ice water concentrations, total air temperatures and humidity levels. Twb was typically maintained at +2°C or -2°C, based on dry total conditions (i.e. without ice or water injection). Total air temperature was >0°C in all tests. The limited test results confirmed that accretion behavior is very sensitive to Twb, which is in turn strongly related to pressure since evaporative cooling increases with decreasing pressure. Humidity and total temperature did not appear to have an independent effect on accretion behavior. Accretions, often resembling glaze ice, formed at Twb<0°C, when freestream water would freeze on the test airfoil without ice crystals present in the freestream. At Twb>0°C ice deposits were observed to be slushy, poorly adhered and shed frequently. The size of such deposits appeared to be a non-linear function of the freestream ice water content (IWC), becoming much larger at high IWC. © 2012 by National Research Council of Canada. Published by the American Institute of Aeronautics and Astronautics, Inc.
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AffiliationAerospace; National Research Council Canada
Peer reviewedYes
NPARC number21270007
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Record identifier7b1665a0-bcc9-4a6d-8116-311e825173e5
Record created2013-12-13
Record modified2016-05-09
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