Improving engine cooling with special baffles Page: 2 of 69
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NACA ARB No. Z505 31176 014033071
NATIONAL ADVISORY COIETEE FOR ABRONAUTICS
ADAEZ ESRC ICTED REPORT
IMPROYDG NGI COOLING 3 WI SPECIAL BA FFlES
By Arnold. E. Biermann, Harvey A. Cook1
and Louis F. Held.
SUMMARY
Tests were made to determine the effect f special baffles on
the temperature. and the cooling-air requirements of the
Wright 1820 G200 and R-2600-8 cylinders. Nine baffle combinations
were tested on a Wright 1820 G200 cylinder and two baffle canbina-
tions, on a front-row cylinder from a Wright R-2600-8 engine. One
special baffle was tested on a front-row cylinder ofa an
R-2600-8 multicylinder engine operating on a torque stand.
Some of the special baffles tested resulted in substantial
reductions in cylinder-barrel and rear cylinder-head temperatures.
The ducts provided for conducting cold air to the high-temperature
regions were very effective in improving the cooling of internal
areas that have good thermal connection with the external -cooling
means, such as the combustion-chamber walls. Tests with the
Wright R-2500-8 cylinder showed that change in the baffles were
not very affective In reducing the temperature of surfaces that
tend to be thermally isolated from the external-cooling means, such
as the exhaust-valve crown or the spark-plug center electrodes.
INTOUCTION
The tests herein described were made at the NACA laboratory in
Cleveland during 1943 as a result of difficulties experienced in
cooling exhaust-valve and rear spark-plug regions of air-cooled
aircraft cylinders during high-output cruising operations. A spe-
ocflo object of this investigation was to determine whether an
improvement in cooling oould be made by changing the cylinder
baffling without causing an appreciable increase in total coollng-
air flow. The following methods of Improving cooling by means at
baffles were teetea:
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Biermann, Arnold E.; Cook, Harvey A. & Held, Louis F. Improving engine cooling with special baffles, report, February 1945; (https://digital.library.unt.edu/ark:/67531/metadc61994/m1/2/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.