Two-dimensional aerodynamic characteristics of 34 miscellaneous airfoil sections (open access)

Two-dimensional aerodynamic characteristics of 34 miscellaneous airfoil sections

The aerodynamic characteristics of 34 miscellaneous airfoils tested in the Langley two-dimensional low-turbulence tunnels are presented. The data include lift, drag, and in some cases, pitching-moment characteristics, for Reynolds numbers between 3.0 x 10 (exp 6) and 9.0 x 10 (exp 6).
Date: January 31, 1949
Creator: Loftin, Laurence K., Jr. & Smith, Hamilton A.
System: The UNT Digital Library
Vibration Survey of Blades in 10-Stage Axial-Flow Compressor 1: Static Investigation (open access)

Vibration Survey of Blades in 10-Stage Axial-Flow Compressor 1: Static Investigation

"An investigation was conducted to determine the cause of failures in the seventh- and tenth-stage blades of an axial-flow compressor. The natural frequencies of all rotor blades were measured and critical-speed diagrams were plotted. These data show that the failures were possibly caused by resonance of a first bending-mode vibration excited by a fourth order of the rotor speed in the seventh stage and a sixth order in the tenth stage" (p. 1).
Date: January 31, 1949
Creator: Meyer, André J., Jr. & Calvert, Howard F.
System: The UNT Digital Library