Numerische Simulation formvariabler Strukturkonzepte axialer Eintrittsleiträder von Turboverdichtern

The presented work is concerned with the application of LS-DYNA to the mechanical analysis of shape adaptive airfoils in turbomachines. Adjustable Inlet Guide Vanes (IGV) in modern turbo compressors found a broad application and thus extend the operating range significantly. They are working as a regulating valve by adjusting the stagger angle of each airfoil. This can cause separations in the IGV which reduce the desired flow deflection and produces additional losses. A new approach is to actively adjust the airfoil geometry of the IGV to achieve the desired flow conditions. The boundary layers of a specificly contoured surface can be better controlled compared to the strong acceleration and deceleration of the flow in the leading edge area of restaggered guide vanes. This paper focuses on a concept which is based on a kinematic chain mechanism with a trailing edge adaption up to 50◦ . After a short overview of the design procedure of the concept, a structural simulation under static aerodynamic forces is discussed. Finally the design and computation of deformable surface layers, which define the contour of the airfoil, are presented.