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Analysis of Flutter suppression by Trailing Edge Oscillaton
From the results of detailed analysis, the control method by changing oscillation direction was found not effective when the blade stiffness was small. As a more general control method effective for transonic cascades, the active vibration of blade trailing edge was found to have great potential. Figure 10 illustrates the method of the trailing edge oscillation. The region of flapping oscillation extends about 30% chord length from the trailing edge. The angular displacement of the oscillation is ф. The active vibration of trailing edge oscillation can be realized by, for instance, piezo-electric device. The active trailing edge oscillation is expected to provide desirable change in the oscillatory motion of passage shock wave as shown in the previous case.
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Figure 10. Oscillation of Blade Trailing Figure 11. Flat Plate equipped with Edge Piezo-Electric Device |
As a test case, a piezo-electric device was mounted on a fkt plate as shown in Fig.11, and the active vibration of the plate was observed. Figure 12 shows the sketch of the trailing edge oscillation. The displacement of the trailing edge was measured from the photograph, and a displacement of the trailing edge by around 0.2mm was found.
