On the application of radial-splitters flow spreaders in the NAL 1-FT. blowdown tunnel

Seshadri, SN and Rao, DM (1974) On the application of radial-splitters flow spreaders in the NAL 1-FT. blowdown tunnel. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    Blowdown wind tunnels operating from high-pressure air-storage normally require an effective flow conditioning system. Downstream of the pressure-regulating (throttling) valve, in order to obtain acceptable flow uniformity and steadiness in the test-section. Firstly, the shock system 'accompanying the compressible throttling process must be controlled and the duct receiving the throttled flow made to run full under all operating positions of the valve. Secondly, the high subsonic, intensely turbulent flow in the duct must be expanded to the considerably larger cross-section of the setting. Chamber, across which a relatively high degree of velocity uniformity is needed for efficient functioning of the turbulence reducing screens. The entire conditioning process must be carried out within a minimum length for economy of space, and also to avoid excessive internal volume between the valve and the nozzle throat which directly affects the duration of the starting transient (and thus the magnitude of starting shock loads on models in supersonic tests).

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Blowdown wind tunnels operating;High pressure air storage; Subsonic;Skin friction gauge
    Subjects: AERONAUTICS > Aerodynamics
    Division/Department: Aerodynamics, Aerodynamics
    Depositing User: Poornima Narayana
    Date Deposited: 06 Dec 2006
    Last Modified: 24 May 2010 09:48
    URI: http://nal-ir.nal.res.in/id/eprint/2516

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