Theoretical and Experimental Analysis of the Reduction of Rotor Blade Vibration in Turbomachinery Through the Use of Modified Stator Vane Spacing

Theoretical and Experimental Analysis of the Reduction of Rotor Blade Vibration in Turbomachinery Through the Use of Modified Stator Vane Spacing
Author: Richard H. Kemp
Publisher:
Total Pages: 43
Release: 1958
Genre: Gas dynamics
ISBN:
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Experimental verification of the analysis was obtained by using an air-interrupter disk and comparing the vibration amplitudes of turbine blades in a turbojet engine when two different nozzle vane configurations were used. One was an equally spaced vane configuration, and the other was one which the analysis had indicated would result in a reduction of the excitation level. The measured amplitudes of vibration of the turbine blades during engine operation compared favorably with those predicted by the analysis.

Technical Note

Technical Note
Author: United States. National Advisory Committee for Aeronautics
Publisher:
Total Pages: 372
Release: 1958
Genre: Aeronautics
ISBN:
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Simplified Method for Determination of Critical Height of Distributed Roughness for Boundary-layer Transition at Mach Numbers from 0 to 5

Simplified Method for Determination of Critical Height of Distributed Roughness for Boundary-layer Transition at Mach Numbers from 0 to 5
Author: Albert L. Braslow
Publisher:
Total Pages: 624
Release: 1958
Genre: Airplanes
ISBN:
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The method has been applied to various types of configurations in several wind-tunnel investigations conducted by the National Advisory Committee for Aeronautics at Mach numbers up to 4, and in all cases the calculated roughness height caused premature boundary-layer transition for the range of test conditions.