Correlation of Engine-Cooling Data Page: 2 of 28
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3 1176e01408U712
MR No. L5A17 I
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS
MEMORANDUM REPORT
CORRELATION OF ENGINE-COOLING DATA
By D. E. Brimley and Maurice J. Brevoort
SUMMARY
A method of correlating engine-cooling data and its
application to a representative engine-cooling test is
presented. Consideration is made of the effects of alti-
tude on the engine-cooling performance. The correlation
equations are developed so that application to specific
engine-cooling problems is simple and direct.
The essentials of the correlation method are:
1. The rate of heat flow from the combustion gases
to the bngine cylinder is equated to a function of the
indicated horsepower corrected for fuel-air ratio, several
temperatures, and the exhaust back pressure. This treat-
ment simplifies the application c. the correlation method
to the calculation of engine-cooling performance under
any conditions.
2. Temperature differences are employed which closely
approach the effective values.
3. The weight flow of cooling air is related to the
loss of total pressure and to the air density at the rear
of the engine.
A section is included on experimental procedure.
An example of determining the cooling-pressure loss for.
given engine-operating conditions at altitude is given.
INTRODUCTION
The NACA currently uses a method of correlation of
engine-cooling data based on references 1 and 2. Good
results have been obtained by use of this method in
predicting low-altitude cooling performance on the basis
of wind-tunnel tests. For same time it has been generallyI' - ---- '
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Brimley, D. E. & Brevoort, Maurice J. Correlation of Engine-Cooling Data, report, January 1945; (https://digital.library.unt.edu/ark:/67531/metadc61958/m1/2/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.