J. Phys. III France
Volume 2, Numéro 4, April 1992
Page(s) 527 - 544
DOI: 10.1051/jp3:1992146
J. Phys. III France 2 (1992) 527-544

Analysis of forced response of detuned blade rows

Hsiao-Wei. D. Chiang and Sanford Fleeter

Scool of Machanical Engineering, Purdue University, West Lafayette, Indiana 47907, U.S.A.

(Received 13 May 1991, revised 15 October 1991, accepted 17 October 1991)

A mathematical model is developed and utilized to demonstrate the enhanced forced response behavior associated with aerodynamic, structural, and combined aerodynamic-structural detuning of a loaded rotor operating in an incompressible flow field. The unsteady aerodynamic gust response and oscillating cascade aerodynamics are determined by developing both a complete first-order unsteady aerodynamic analysis and a locally analytical solution in individual grid elements of a body fitted computational grid. The aerodynamic detuning is accomplished by means of alternate circumferential airfoil spacing, with alternate blade structural detuning also considered. The beneficial forced response effects of these detuning techniques are then demonstrated by applying this model to various detuned rotor configurations.

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