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The Compressibility BurbleSimultaneous air-flow photographs and pressure-distribution measurements have been made of the NACA 4412 airfoil at high speeds in order to determine the physical nature of the compressibility burble. The flow photographs were obtained by the Schlieren method and the pressures were simultaneously measured for 54 stations on the 5-inch-chord wing by means of a multiple-tube photographic manometer. Pressure-measurement results and typical Schlieren photographs are presented. The general nature of the phenomenon called the "compressibility burble" is shown by these experiments. The source of the increased drag is the compression shock that occurs, the excess drag being due to the conversion of a considerable amount of the air-stream kinetic energy into heat at the compression shock.
Document ID
19930081326
Acquisition Source
Legacy CDMS
Document Type
Other - NACA Technical Note
Authors
Stack, John
Date Acquired
September 6, 2013
Publication Date
October 1, 1935
Subject Category
Aerodynamics
Report/Patent Number
NACA-TN-543
Accession Number
93R10616
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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