Preliminary Tests of Nose- and Side- Entrance Blower Cooling Systems for Radial Engines, Special Report

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Description

Two cowling systems intended to reduce the drag and improve the low-speed cooling characteristics of conventional radial engine cowlings were tested in model form to determine the practicability of the methods. One cowling included a blower mounted on the rear face of a large propeller spinner which drew cooling air in through side entrance ducts located behind the equivalent engine orifice plate. The air was passed through the equivalent engine orifice plate from rear to front and out through a slot between the spinner and the engine plate. The blower produced substantially all the power necessary to circulate the cooling ... continued below

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Biermann, David & Valentine, E. Floyd July 1, 1939.

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  • Main Title: Preliminary Tests of Nose- and Side- Entrance Blower Cooling Systems for Radial Engines, Special Report
  • Series Title: NACA Special Reports

Description

Two cowling systems intended to reduce the drag and improve the low-speed cooling characteristics of conventional radial engine cowlings were tested in model form to determine the practicability of the methods. One cowling included a blower mounted on the rear face of a large propeller spinner which drew cooling air in through side entrance ducts located behind the equivalent engine orifice plate. The air was passed through the equivalent engine orifice plate from rear to front and out through a slot between the spinner and the engine plate. The blower produced substantially all the power necessary to circulate the cooling air in some cases, so the quantity of air flowing was independent of the air speed, Two types of blowers were used, a centrifugal type and one using airfoil blades which forced the air outward from the center of rotation. The other cowling was similar to the conventional N.A.C.A. cowling except for the addition of a large propeller spinner nose. The spinner was provided with a hole in the nose to admit cooling air and blower blades to increase the pressure for cooling at low speeds. The tests show that with both cowling types the basic drag of the nacelle was reduced substantially below that for the N.A.C.A. cowling by virtue of the better nose shape made possible by the spinner . The drag due to the side-entrance ducts was nearly zero when the openings were closed or when the blower was drawing in a certain quantity of air in proportion to the air speed. The drag increased, however, when air mas allowed to spill from the openings. The nose-entrance blower showed considerable promise as a cooling means although the blower tested was relatively inefficient, owing to the fact that the blower compartments evidently were expanded too rapidly under the conditions imposed. by the design.

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  • URL: http://hdl.handle.net/2060/20090015243 External Link
  • Report No.: NACA-SR-121
  • Center for AeroSpace Information Number: 20090015243
  • Archival Resource Key: ark:/67531/metadc65131

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National Advisory Committee for Aeronautics Collection

The National Advisory Committee for Aeronautics (NACA) was a U.S. federal agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved, and its assets and personnel transferred to the newly created National Aeronautics and Space Administration (NASA).

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Creation Date

  • July 1, 1939

Added to The UNT Digital Library

  • Nov. 17, 2011, 5:13 p.m.

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  • Nov. 30, 2016, 12:44 p.m.

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Biermann, David & Valentine, E. Floyd. Preliminary Tests of Nose- and Side- Entrance Blower Cooling Systems for Radial Engines, Special Report, report, July 1, 1939; (digital.library.unt.edu/ark:/67531/metadc65131/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.