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Correction of Temperatures of Air-Cooled Engine Cylinders for Variation in Engine and Cooling ConditionsFactors are obtained from semiempirical equations for correcting engine-cylinder temperatures for variation in important engine and cooling conditions. The variation of engine temperatures with atmospheric temperature is treated in detail, and correction factors are obtained for various flight and test conditions, such as climb at constant indicated air speed, level flight, ground running, take-off, constant speed of cooling air, and constant mass flow of cooling air. Seven conventional air-cooled engine cylinders enclosed in jackets and cooled by a blower were tested to determine the effect of cooling-air temperature and carburetor-air temperature on cylinder temperatures. The cooling air temperature was varied from approximately 80 degrees F. to 230 degrees F. and the carburetor-air temperature from approximately 40 degrees F. to 160 degrees F. Tests were made over a large range of engine speeds, brake mean effective pressures, and pressure drops across the cylinder. The correction factors obtained experimentally are compared with those obtained from the semiempirical equations and a fair agreement is noted.
Document ID
19930091720
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Schey, Oscar W
Pinkel, Benjamin
Ellerbrock, Herman H , Jr
Date Acquired
September 6, 2013
Publication Date
January 1, 1939
Report/Patent Number
NACA-TR-645
Accession Number
93R21010
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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