Abstract: High Cycle Fatigue (HCF) is a key technology issue in the development and endurance of gas turbine engines that results from the resonant response of the blading to unsteady aerodynamic excitations. In high-speed centrifugal compressors, the vaned diffuser potential field and/or shock structure is a significant source of excitation to the rotating impeller. The impeller responds to this diffuser-generated forcing function, with the tips of the inducer and impeller blades exhibiting flow induced vibration and HCF. This research is targeted at understanding the propagation of the diffuser-generated forcing function through the impeller flow passage, the resulting impeller aerodynamic response, and its implications for the aeromechanics problem. Simulation of the impeller unsteady aerodynamic response to the diffuser-generated forcing function is performed using the inviscid 3D finite element solver TAMALE3D with the forcing function taken from static pressure measurements in the vaneless space. The unsteadiness from the diffuser is found to be primarily confined to the radial portion of the impeller passage. Based on the simulations, the impeller back-sweep is hypothesized to play a dominant role in the energy transfer to the blade vibration.
Publication Year: 2007
Publication Date: 2007-07-08
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 3
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