STUDY ON THE UNSTEADY FORCE ON A BLADE DUE TO A MOVING CYLINDER IN AN AIRSTREAM

概要

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On a blade row in turbomachinery, the unsteady force comes out owing to the following two main sources, i.e. the wake effect and the circulation effect. This paper is planned in order to make clear theoretically the wake effect on the blade. When a cylinder is moving near a stationary blade, the wake sweeps downstream through the blade. The velocity profile in the wake shed by the moving cylinder is approximated by the stationary counterpart. Calculations are done for various values of the velocity of the cylinder and axial spacing, while taking account of wake varying with distance from the cylinder. The cylinder is represented by a doublet traveling in a free-stream in order to predict the unsteady force on the blade due to the theoretical cylinder-thickness effect. The computed unsteady force on the blade due to the wake effect and the cylinder-thickness effect is added and compared with the experimental one. The reason why discrepancies arise is also considered.
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