A combination of analysis and testing has been utilized to develop a theory of jet flap thrust recovery at the low speeds and large deflection angles characteristic of V/STOL lift systems. The contribution of jet drag to the reduction in recovery has been computed with a viscid/inviscid interaction analysis. The results of this computation are compared to wake survey and airfoil surface pressure measurements made with a two-dimensional jet flapped airfoil model. The thrust recovery is nearly complete for small values of the jet deflection angle, but for larger angles, the recovery decreases as the thrust coefficient increases. It is concluded that the loss of recovery is due to the jet drag for values of the thrust coefficient less than unity; for larger values, the loss is increased by flow separation from the airfoil. (Author)


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    Title :

    Progress Towards a Theory of Jet Flap Thrust Recovery


    Contributors:
    P. M. Bevilaqua (author) / P. E. Cole (author) / E. F. Schum (author)

    Publication date :

    1980


    Size :

    266 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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