This paper treats the free vibration of hollow symmetrical turbo-machinery blades conveying cooling fluid. The blade motion is described by using a simplified shell theory, whereas the fluid forces are described by the linearized potential flow theory. Natural frequencies are presented for the axial and circumferential modes and the effect of flow velocity and other parameters are discussed. Two models are constructed and tested with air and water as the flowing fluid. Also a beam approximation is used to justify the results at least in a qualitative manner. Experimental data and theoretical results are in good agreement and they all show that the fluid flow tends to decrease the free vibration-natural frequencies.

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