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Analysis and Verification of the Icing Scaling Equations. Volume 1. Revision.

ADA167976

Publication Date	1986
Personal Author	Ruff, G. A.
Page Count	84
Abstract	Study objectives were to evaluate the equations governing the ice-accretion process to identify proposed scaling parameters and to conduct tests to determine which, is any, of the proposed methods produced scale ice accretions. Study results include: (1) A set of equations that can be used to calculate test conditions so that scaled ice shapes are produced on geometrically similar bodies was developed and experimentally verified. (2) Posttest evaluation of the scaling parameters based on the actual test conditions was necessary for accurate evaluation of test results. (3) An icing similitude computer code, SIMICE, was developed to calculate similtude conditions using the verified scaling equations. (4) The equations were applicable over the range of meteorological conditions found in natural icing, with the possible exception of velocity. (5) Velocity is the primary limitation of the scaling equations. To maintain scaled flow fields and droplet impingement characteristics, both the model and full-scale velocities must yield a Reynolds number > or = 200,000 and < the velocity giving the critical Mach number of the body geometry. (6) At values of dynamic pressure of approximately 1.6 psia, shedding characteristics of the ice accretion were observed to affect the final ice shape. Keywords: Aerodynamics: Thermodynamics; Ice formation; Scaling factors; and Thermal models.
Keywords	Ice formation Scaling factors Aerodynamics Mach number Equations Flow fields Ice Shape Meteorology Computer programs Drops Impingement Velocity Limitations Parameters Models Thermal properties Dynamic pressure Reynolds number Thermodynamics Mathematical models Model tests Model theory SIMICE computer program Meteorological parameters Ice shedding
Source Agency	Non Paid ADAS
NTIS Subject Category	48H - Snow, Ice, & Permafrost 51A - Aerodynamics 55E - Physical Meteorology
Corporate Authors	Arnold Engineering Development Center, Arnold AFS, TN.
Supplemental Notes	Revision to report dated Nov 85, AD-A162 226. See also Volume 2, AD-B097 466L. Prepared in cooperation with Sverdrup Technology, Inc., Arnold AFS, TN.
Document Type	Technical Report
Title Note	Final rept. 1 Aug 81-31 Mar 84.
NTIS Issue Number	198618

Analysis and Verification of the Icing Scaling Equations. Volume 1. Revision.

Analysis and Verification of the Icing Scaling Equations. Volume 1. Revision.
ADA167976

Publication Date	1986
Personal Author	Ruff, G. A.
Page Count	84
Abstract	Study objectives were to evaluate the equations governing the ice-accretion process to identify proposed scaling parameters and to conduct tests to determine which, is any, of the proposed methods produced scale ice accretions. Study results include: (1) A set of equations that can be used to calculate test conditions so that scaled ice shapes are produced on geometrically similar bodies was developed and experimentally verified. (2) Posttest evaluation of the scaling parameters based on the actual test conditions was necessary for accurate evaluation of test results. (3) An icing similitude computer code, SIMICE, was developed to calculate similtude conditions using the verified scaling equations. (4) The equations were applicable over the range of meteorological conditions found in natural icing, with the possible exception of velocity. (5) Velocity is the primary limitation of the scaling equations. To maintain scaled flow fields and droplet impingement characteristics, both the model and full-scale velocities must yield a Reynolds number > or = 200,000 and < the velocity giving the critical Mach number of the body geometry. (6) At values of dynamic pressure of approximately 1.6 psia, shedding characteristics of the ice accretion were observed to affect the final ice shape. Keywords: Aerodynamics: Thermodynamics; Ice formation; Scaling factors; and Thermal models.
Keywords	Ice formation Scaling factors Aerodynamics Mach number Equations Flow fields Ice Shape Meteorology Computer programs Drops Impingement Velocity Limitations Parameters Models Thermal properties Dynamic pressure Reynolds number Thermodynamics Mathematical models Model tests Model theory SIMICE computer program Meteorological parameters Ice shedding
Source Agency	Non Paid ADAS
NTIS Subject Category	48H - Snow, Ice, & Permafrost 51A - Aerodynamics 55E - Physical Meteorology
Corporate Authors	Arnold Engineering Development Center, Arnold AFS, TN.
Supplemental Notes	Revision to report dated Nov 85, AD-A162 226. See also Volume 2, AD-B097 466L. Prepared in cooperation with Sverdrup Technology, Inc., Arnold AFS, TN.
Document Type	Technical Report
Title Note	Final rept. 1 Aug 81-31 Mar 84.
NTIS Issue Number	198618