Aerodynamic Reduced-Order Model of Shape-Change Blade Subjected to Upstream Wake

Abstract

This paper presents a Volterra series reduced-order model method to evaluate aerodynamic forces of aircraft engine blade designs, whose shape changes during design and are always excited by upstream wakes. The method uses a superposition of the steady and dynamic Volterra series to reach this aim. The steady series represents the influence of the blade shape changes on the blade aerodynamic forces. The dynamic series represents the impact of the unsteady upstream wakes on the blade aerodynamic forces. A T106LPT blade is used as an example to discuss the proposed method. The accuracy of the ROM method is analyzed by the example at the wake excitation condition with or without shape-change. The example shows that the ROM method can predict the wake induced pressure variation of a shape-change blade without repeated computational fluid dynamics (CFD) analyses.