- Crawley, E. F. and Hall, K. C., OPTIMIZATION AND MECHANISMS OF MISTUNING IN CASCADES.,
Journal of Engineering for Gas Turbines and Power, Transactions of the ASME, vol. 107 no. 2
pp. 418 - 426 .
(last updated on 2007/04/10)
An inverse design procedure has been developed for the optimum mistuning of a high bypass ratio shroudless fan. The fan is modeled as a cascade of blades, each with a single torsional degree of freedom. Linearized supersonic aerodynamic theory is used to compute the unsteady aerodynamic forces in the influence coefficient form at a typical blade section. The mistuning pattern is then numerically optimized using the method of nonlinear programming via augmented Lagrangians. The objective of the mistuning is to achieve a specified increase in aeroelastic stability margin with a minimum amount of mistuning. It is shown that a necessary but not sufficient condition for aeroelastic stability is that the blades be self-damped.
TURBOMACHINERY - Blades;FANS - Mathematical Models;ROTORS - Performance;AERODYNAMICS;