Aero-Mechanical Coupling in a High-Speed Compressor

Abstract : This report describes the results of several studies which sought to improve the understanding of coupling between the fluid and structures which are common in modern, high-speed axial compressors. There were two major areas of focus. The first was the development of measurement technique specifically for the study of these phenomena, termed Blade Image Velocimetry (BIV). The technique can measure fluid and structural velocity fields simultaneously and a demonstration of the utility of these measurements is provided for a flat plate undergoing flutter. The theory of the technique is presented with an empirically validated analysis of measurement error. The results of the application of BIV to a high-speed axial compressor are also presented. The second area of focus was the investigation of an isolated compressor blade in a high Mach number flow. The steady vibration amplitude, aerodynamic damping and impulse response were investigated. A complex interdependence was observed for these quantities for variations in flow conditions and blade structural properties.

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