A detailed derivation of a finite-time arbitrary-motion incompressible cascade theory is presented for both Laplace and frequency domains. Such theories are useful for both stability and response calculations. The generalized cascade lift deficiency function C' is shown to be consistent with the generalized Theodorsen's lift deficiency function when the wake spacing approaches infinity or when the reduced frequency tends to infinity; it also yields a correct value for the zero reduced frequency limit. Efficient numerical procedures are presented for the evaluation of the cascade lift deficiency function. Numerical examples comparing the cascade lift deficiency function with Loewy's rotary-wing lift deficiency function is frequency domain are presented. Pade approximants of the cascade lift deficiency function are constructed using a Bode plot approach that allows for complex poles. A general purpose optimization programm is used to determine the coefficients of the approximant.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Time domain unsteady incompressible cascade airfoil theory for helicopter rotors in hover


    Weitere Titelangaben:

    Zeitinstabile inkompressible Kaskaden-Tragfluegel-Theorie fuer Hubschrauberrotoren bei Hoverfahrzeugen


    Beteiligte:
    Dinyavari, M.A. (Autor:in) / Friedmann, P.P. (Autor:in)

    Erschienen in:

    AIAA Journal ; 27 , 3 ; 257-267


    Erscheinungsdatum :

    1989


    Format / Umfang :

    11 Seiten, 6 Bilder, 1 Tabelle, 17 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch






    Analysis of Unsteady Airloads of Helicopter Rotors in Hover

    Balusu M. Rao / Paul R. Schatzle | AIAA | 1978



    Unsteady Aerodynamics of Helicopter Rotors

    W. P. Jones / W. J. McCroskey / J. J. Costes | NTIS | 1972