Currently there is renewed interest in the evaluation and reduction of steady wind tunnel wall interference, especially for large models. Evaluation of previous predictions for perforated and slotted tunnels suggests that a hybrid slotted tunnel (i.e., a slotted tunnel with closed slats and perforated slots) should offer minimum corrections for upwash, flow curvature and solid blockage. This suggestion is confirmed by the present computer studies of a range of rectangular hybrid slotted tunnels. The computer studies are for tunnel working section height to breadth ratios of 0.835 and 0.600 over the Mach number range from 0 to 0.85. Wings swept at 28 deg and 50 deg, with ratios of model span to tunnel breadth varying from 0 to 0.7, are considered. An idealized fuselage shape is used to predict solid and wake blockage corrections for the wall configurations selected on the basis of minimum upwash and curvature interference.


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    Title :

    Computer studies of hybrid slotted working sections with minimum steady interference at subsonic speeds


    Contributors:

    Published in:

    Publication date :

    1985-04-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Wall interference in wind tunnels with slotted and porous boundaries at subsonic speeds

    Baldwin, Barrett S , Jr / Turner, John B / Knechtel, Earl D | NTRS | 1954


    Wall interference in wind tunnels with slotted and porous boundaries at subsonic speeds

    Baldwin, Jr., B.S. / Turner, J.B. / Knechtel, E.D. | Engineering Index Backfile | 1954


    Wall interference in wind tunnels with slotted and porous boundaries at subsonic speeds

    Baldwin, Barrett S , Jr / Turner, John B / Knechtel, Earl D | NTRS | 1953


    Wall interference in wind tunnels with slotted and porous boundaries at subsonic speeds

    Baldwin, Barrett S. / Turner, John B. / Knechtel, Earl D. | TIBKAT | 1954