Wind tunnel supplementary Mach number minimum section insert

Details Wind tunnel supplementary Mach number minimum section insert Wind tunnel supplementary Mach number minimum section insert

1980-03-28

1981-09-01

Woodiel, Donald O.

Measuring and testing

Wind tunnel: aerodynamic wing and propeller study

G01M 900

Patent

active

042864607

ABSTRACT:
The invention relates to a device which changes the Mach number capability of a wind tunnel without permanently altering the existing nozzle of the tunnel. An insert (14) is removably attached to the wall (17) of the existing nozzle expansion area (22) thereby creating a second minimum section (15) upstream of the model test section (21). The added insert (14) may be removed without complicated and expensive changes to the basic wind tunnel. In the embodiment illustrated in FIG. 2, a removable insert (25) is disposed within wind tunnel nozzle walls (17) with a portion of the flow boundary layer being bled off from the tunnel via passageway (29) and tunnel exit (28) to thereby reduce the extent of separated flow normally occuring upstream of the insert contraction section.

REFERENCES:
patent: 3011341 (1961-12-01), Hill

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