Analytical Ice Shape Predictions for Flight in Natural Icing Conditions

Details

• Creators:
  Berkowitz, Brian M. ; Riley, James T.
• Corporate Creators:
  United States. National Aeronautics and Space Administration ; Sverdrup Technology, Inc
• Corporate Contributors:
  Lewis Research Center ; United States. Department of Transportation. Federal Aviation Administration. Technical Center
• Subject/TRT Terms:
  Airplanes Climate Ice Prevention Mathematical Models
• Publication/ Report Number:
  NASA CR-182234 -T/FAA/CT- 88/19
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report
• Corporate Publisher:
  United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center
• Abstract:
  LEWICE is an analytical ice prediction code that has been evaluated extensively against icing tunnel data, but on a more limited basis against flight data. The purpose of this report is to compare ice shapes predicted by LEWICE with experimental ice shapes accreted on the NASA Lewis Icing Research Aircraft. The flight data selected for comparison includes liquid water content recorded using a hot wire device and droplet distribution data from a laser spectrometer; the ice shape is recorded using stereo photography. The main findings are as follows: (1) An equivalent sand grain roughness correlation different from that used for LEWICE tunnel comparisons must be employed to obtain satisfactory results for flight. (2) Using this correlation and making no other changes in the code, the comparisons to ice shapes accreted in flight are in general as good as the comparisons to ice shapes accreted in the tunnel. As in the case of tunnel ice shapes, agreement is least reliable for large glaze ice shapes at high angles of attack. (3) In some cases, comparisons can be somewhat improved by utilizing the code so as to take account of the variation of parameters such as liquid water content, which may vary significantly in flight.
• Format:
  PDF
• Funding:
  NAS3-24105
• Collection(s):
  FAA William J. Hughes Technical Center for Advanced Aerospace
• Main Document Checksum:
  urn:sha-512:cfcb11eb941f479cc65411d5fb21bfa438d231b253ce1c42d6bb8720df3adf8a14470f784bc8d7fcf97d39e6f1064945b4cc0c400b8fbc6575308851ab5dbb05
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/92975/dot_92975_DS1.pdf
• File Type:
  [PDF - 1.21 MB ]