放電による翼のねじれの戻り測定(機械力学,計測,自動制御)
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概要
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The fan blade has the shape twisted the with aerodynamic design. However, the blade produces the deformation in the direction of which the twist is returned by centrifugal force under rotation. The method for measuring the return of the twist of this blade by the discharge was devised, and using the cascade in which the return of the twist was generated suspected, this measurement was tried. Measurement principles are as follows. In the casing wall, needle electrode of several pieces is installed on the axial straight for the blade tip. The high tension is applied to this electrode, and the spark discharge is generated in the electrode and between blade tips. A time difference occurs in produced discharge waveform, when one blade passes several electrodes, because blade shape axially faces it, and because it is not straight line. The difference of the length in each electrode is proven, when this time difference is multiplied by circumferential speed, and as this result, it is possible to obtain the external form of pressure surface of the one blade. The discharge continues during the transit time, when the blade passes the electrode. In it, the shape of the suction surface of the blade can be also measured, if it proves discharge end. As the result that it manufactured the equipment and measured at 16.7m/s circumferential speed, the measurement accuracy of about ± 2 mm was obtained in the pressure surface edge, and about ± 1 mm was obtained in the suction surface edge.
- 一般社団法人日本機械学会の論文
- 2003-12-25
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