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Analytical Study of Icing Similitude for Aircraft Engine Testing.

ADA173713

Publication Date	1986
Personal Author	Bartlett, C. S.
Page Count	110
Abstract	An analytical study was conducted of the requirements for achieving similitude for icing as test conditions were varied. The application is aimed at engine icing tests conducted in ground spray rig facilities. The analysis considers the changes in the icing test conditions, including static temperature, static pressure, liquid water content, droplet size, and flow velocity, that are required to achieve similitude if any of the conditions are changed. The analysis uses a math model of icing scaling which has been validated by experimental data collected at the AEDC icing research tunnel. The requirements for similitude were analyzed for changes in both temperature and pressure. Expressions to describe the influence of test condition changes on the value of the scaling parameter were developed. The effect of icing caused by free-stream static temperature changes and temperature rise through a generic high-bypass turbofan engine was studied. The icing test points listed for compliance testing for aircraft icing certification under guidelines given in the FAA Advisory Circular (AC) 20-73 were used as test points for the analyses.
Keywords	Ice formation Scaling factors Test methods High bypass turbofans Jet aircraft Mathematical models Sprays Test fixtures Water Drops Flow rate Temperature Accumulation Static pressure Airspeed Aircraft Icing Icing Similitude Ice Accretion
Source Agency	Non Paid ADAS Department of Transportation Federal Aviation Administration
NTIS Subject Category	81D - Jet & Gas Turbine Engines 51C - Aircraft
Corporate Authors	Arnold Engineering Development Center, Arnold AFS, TN.; Federal Aviation Administration Technical Center, Atlantic City, NJ.
Supplemental Notes	Prepared in cooperation with Sverdrup Technology, Inc., Arnold AFB, TN. AEDC Group.
Document Type	Technical Report
Title Note	Final rept. Sep 85-Jun 86.
NTIS Issue Number	198704

Analytical Study of Icing Similitude for Aircraft Engine Testing.

Analytical Study of Icing Similitude for Aircraft Engine Testing.
ADA173713

Publication Date	1986
Personal Author	Bartlett, C. S.
Page Count	110
Abstract	An analytical study was conducted of the requirements for achieving similitude for icing as test conditions were varied. The application is aimed at engine icing tests conducted in ground spray rig facilities. The analysis considers the changes in the icing test conditions, including static temperature, static pressure, liquid water content, droplet size, and flow velocity, that are required to achieve similitude if any of the conditions are changed. The analysis uses a math model of icing scaling which has been validated by experimental data collected at the AEDC icing research tunnel. The requirements for similitude were analyzed for changes in both temperature and pressure. Expressions to describe the influence of test condition changes on the value of the scaling parameter were developed. The effect of icing caused by free-stream static temperature changes and temperature rise through a generic high-bypass turbofan engine was studied. The icing test points listed for compliance testing for aircraft icing certification under guidelines given in the FAA Advisory Circular (AC) 20-73 were used as test points for the analyses.
Keywords	Ice formation Scaling factors Test methods High bypass turbofans Jet aircraft Mathematical models Sprays Test fixtures Water Drops Flow rate Temperature Accumulation Static pressure Airspeed Aircraft Icing Icing Similitude Ice Accretion
Source Agency	Non Paid ADAS Department of Transportation Federal Aviation Administration
NTIS Subject Category	81D - Jet & Gas Turbine Engines 51C - Aircraft
Corporate Authors	Arnold Engineering Development Center, Arnold AFS, TN.; Federal Aviation Administration Technical Center, Atlantic City, NJ.
Supplemental Notes	Prepared in cooperation with Sverdrup Technology, Inc., Arnold AFB, TN. AEDC Group.
Document Type	Technical Report
Title Note	Final rept. Sep 85-Jun 86.
NTIS Issue Number	198704