The unsteady aerodynamic analyses intended for turbomachinery aeroelastic and aeroacoustic predictions must be applicable over wide ranges of blade-row geometries, operating conditions and modes of unsteady excitation. Also, because of the large number of controlling parameters involved, there is a stringent requirement for computational efficiency. To date these requirements have been met only to a limited extent. As a result, aeroelastic and aeroacoustic design predictions are, for the most part, still based on the classical linearized unsteady aerodynamic analyses developed in the early 1970s. During the past decade, significant advances in unsteady aerodynamic prediction capabilities have been achieved. In particular, reseachers have developed efficient linearized analyses that account for the effects of realistic design features, such as real blade geometry, mean blade loading and operation at transonic Mach numbers, on the unsteady aerodynamic response of two-dimensional cascades. The improvements in physical modeling that such linearizations allow are motivating their current implementation into aeroelastic and aeroacoustic design prediction systems. Also, considerable progress has been made on developing time-accurate Euler and Navier-Stokes simulations of nonlinear unsteady flows through blade rows. Although not yet suitable for design use, such analyses offer opportunities for an improved understanding of the unsteady aerodynamic processes associated with blade vibration and noise generation. These recent advances in the theoretical and computational modeling of turbomachinery unsteady flows are reviewed in the present paper.


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    Title :

    Unsteady aerodynamic methods for turbomachinery aeroelastic and aeroacoustic applications


    Additional title:

    Instabile aerodynamische Methoden für aeroelastische und aeroakustische Anwendungen in Turbomaschinen


    Contributors:

    Published in:

    Publication date :

    1992


    Size :

    24 Seiten, 12 Bilder, 82 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English