Accession Number:

ADA801345

Title:

Bending-Torsion Flutter Calculations Modified by Subsonic Compressibility Corrections

Personal Author(s):

Corporate Author:

NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS LANGLEY FIELD VA LANGLEY AERONAUTICAL LABORATORY

Report Date:

1946-05-01

Abstract:

A number of calculations of bending-torsion wing flutter are made at two Mach numbers, M 0 incompressible case and M 0.7, and the results are compared. The air forces employed for the case of M 0.7 are based on Frazers recalculation of Possios results, which are derived on the assumption of small disturbances to the main flow. For ordinary wings of normal density and of low bending frequency in comparison with torsion frequency, the compressibility correction to the flutter speed appears to be of the order of a few percent whereas, the correction to the flutter speed for high-density wing sections, such as propeller sections, and to the wing-divergence speed in general may be based on a rule using the 1 - M squared sup 14 factor and, for M 0.7, represents a decrease of the order of 17 percent.

Descriptive Note:

Technical note

Pages:

0020

Identifiers:

Distribution Statement:

Approved for public release; distribution is unlimited.

File Size:

0.45MB