Convegni ATI - Accesso riservato soci CTI

Autore: P. De Palma, R. Monteriso, G. Pascazio, M. Napolitano

Collana: CA - 61 - Perugia 2006

Note:
In the design of modern jet engines there is a continuous trend towards increasing the blade loading in order to reduce the number of turbine stages and thus the weight of the engine. Therefore, especially in low-pressure stages, where the Reynolds
number can be relatively low and the boundary layers are laminar over a large portion of the surfaces, separation may occur.
Furthermore, the unsteady wake/blade interaction may have a great influence on boundary layer separation and thus on the stage efficiency. The aim of this work is to develop a methodology for modeling the interaction between the wake and the boundary layer by solving the Reynolds averaged Navier-Stokes equations for compressible flows employing a low-Reynolds number k-ω turbulence model and a transition model based on a transport equation for the intermittency factor. To this purpose, a parallel multi-block method has been developed, capable of handling moving meshes in order to simulate
turbomachinery rotor-stator interactions, and employed for simulating the interaction between the wakes generated by cylindrical moving bars and a low-pressure turbine cascade.