OS-604 Experimental Study on Unsteady Aerodynamic Characteristics of Transonic Compressor Cascades : Pressure Transfer Characteristics of Indirect Unsteady Pressure Measurements(Organized Session 6: Unsteady Aerodynamic Force/Vibration)

概要

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To elucidate the unsteady aerodynamic characteristics of transonic compressor cascade in pitching mode, unsteady pressure measurements were performed. A forced vibration method is used in which only one blade in the cascade is subjected to pitching oscillation up to 500Hz by a high-speed mechanical drive system. The measurement was indirect pressure measurement. Therefore, the measured unsteady pressures have to be corrected with pressure transfer characteristic data of the probe system. To obtain the pressure transfer characteristicx in advance, we constructed a fluctuating pressure generating system, which generates a high frequency up to 1.5kHz and large amplitude up to 10kPa of fluctuating pressure. It is found that amplitude ratio of pressure transfer is affected by both the Mach number and the amplitude of fluctuating pressure, although the phase angle has little relation to them. Using these pressure transfer characteristic data, measured unsteady pressures were corrected and the unsteady moment of each blade at one blade oscillation was calculated. Finally, these unsteady moments of each blade are added linearly with an interblade phase angle using a one blade oscillation method to obtain the unsteady aerodynamic moment in the case that all blades are vibrating in pitching mode.
社団法人日本ガスタービン学会の論文
1999-11-14