Cooling Investigation of a B-24D Engine-Nacelle Installation in the NACA Full-Scale Tunnel Page: 3 of 145
This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and was provided to Digital Library by the UNT Libraries Government Documents Department.
The following text was automatically extracted from the image on this page using optical character recognition software:
cooling was attained by extending the cowl forward to reduce
the clearance between the full-feathered propeller .and the"
cowl nose from 3 indhes to approximately 1/2 inch, by reducing the
intercooler duct width at the cowl outlet, and by cutting. back on
the shroud over the exhaust collector ring to increase the effective.
outlet area. As a result, the cooling was sufficiently improved so
that climb and level-flight operation could be continued up to
20,000 feet at 1050-brake-horsepower engine output.
Further modifications were made to the installation including
the use of larger carburetor jets. With these jets the mixture
to the engine was enriched by approximately 7 percent. It was then
possible to provide marginal intercooling and engine cooling for
1050 brake horsepower at 25,000 feet.
The primary object of the wind-tunnel investigation has been
to determine the modifications necessary to cool the engine at
cruising, normal, and military power at 25,000 feet altitude. In
addition, an analysis was made at the request of the ArmU Air Forces
to determine the possibilities of obtaining satisfactory cooling with
normal and military power at a critical altitude of 35,006 feet.
The tests, which were made on a single production nacelle.mounted
in the tunnel on a stub wing, included investigations of the engine
cowling and cooling, the intercooling, the oil cooling, the turbo-
eupercharger.installation, and the flow through the induction system.
The effects on the engine temperatures of the cooling-air pressure
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Lehr, Robert R.; Kinghorn, George F. & Guryansky, Eugene R. Cooling Investigation of a B-24D Engine-Nacelle Installation in the NACA Full-Scale Tunnel, report, November 1942; (https://digital.library.unt.edu/ark:/67531/metadc62117/m1/3/: accessed May 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.