Determination of induced velocity in front of an inclined propeller by a magnetic-analogy method /
Clifford S. Gardner and James A. LaHatte, Jr.
Description
- Language(s)
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English
- Published
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Langley Field, VA : Langley Memorial Aeronautical Laboratory, 1946.
- Summary
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Summary: The horizontal and vertical components of the induced velocity in front of an inclined propeller in a horizontal stream were obtained by a magnetic-analogy method. The problem was formulated in terms of the linear theory of the acceleration potential of an incompressible nonviscous fluid. The propeller was assumed to be an actuator disk. The horizontal component of the induced velocity was found by a numerical calculation. Numerical calculation of the vertical component, however, was not practicable; therefore the vertical component was obtained from electrical measurements by use of the analogy between the acceleration potential of an incompressible nonviscous fluid and the potential of a magnetic field. An alternative formulation of the problem in terms of the trailing-vortex sheet is shown to be equivalent to the acceleration-potential formulation if the thrust coefficient is assumed so small that the slipstream is not deflected and undergoes no contraction. From the results presented, induced velocities of greater accuracy are shown to be obtainable from a modification of the vortex theory based on the assumption of a constant finite down-wash angle of the slipstream.
- Note
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"NACA WARTIME REPORTS are reprints of papers originally issued to provide rapid distribution of advance research results to an authorized group requiring them for the war effort. They were previously held under a security status but are now unclassified. Some of these reports were not technically edited. All have been reproduced without change in order to expedite general distribution."
"Report date February 1946."
"Originally issued February 1946 Advance Restricted Report L6A05b."
"Report no. L-154."
Also available in electronic format.
- Physical Description
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20, [50] p. :
ill. ;
28 cm.
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