A method is presented for the estimation of the subsonic-flight-speed characteristics of sharp-lip inlets applicable to supersonic aircraft. The analysis, based on a simple momentum balance consideration, permits the computation of inlet pressure recovery - mass-flow relations and additive-drag coefficients for forward velocities from zero to the speed of sound. The penalties for operation of a sharp-lip inlet at velocity ratios other than 1.0 may be severe; at lower velocity ratios an additive drag is incurred that is not cancelled by lip suction, while at higher velocity ratios, unavoidable losses in inlet total pressure will result. In particular, at the take-off condition, the total pressure and the mass flow for a choked inlet are only 79 percent of the values ideally attainable with a rounded lip. Experimental data obtained at zero speed with a sharp-lip supersonic inlet model were in substantial agreement with the theoretical results.


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    Title :

    Theoretical Performance Characteristics of Sharp Lip Inlets at Subsonic Speeds


    Contributors:

    Publication date :

    1953-09-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Theoretical performance characteristics of sharp-lip inlets at subsonic speeds

    Fradenburgh, Evan A. / Wyatt, DeMarquis D. | TIBKAT | 1954


    Theoretical performance characteristics of sharp-lip inlets at subsonic speeds

    Fradenburgh, Evan A. / Wyatt, DeMarquis D. | TIBKAT | 1953


    Theoretical performance characteristics of sharp-lip inlets at subsonic speeds

    Fradenburgh, E.A. / Wyatt, D.D. | Engineering Index Backfile | 1953



    Performance of several half-conical side inlets at supersonic and subsonic speeds

    Cubbison, R. W. / Flaherty, R. J. / Stitt, L. E. | NTRS | 1956