Flow quality improvements in a blowdown wind tunnel 13; 13;

Sundaramurthy, H and Verma, RS and Jagadeeswarachar, SP and Kumar, Rajan (2001) Flow quality improvements in a blowdown wind tunnel 13; 13;. Journal of Aircraft, 38 (3). pp. 577-580.

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Acoustic baffles installed in the extended settling chamber of the NAL 1.2-m tunnel have substantially reduced the noise levels in its settling chamber and the SW test section. The quieter test-section flow has led to (1) a substantial improvement in the measurement accuracy of pulsation level data in air-intake models at supersonic speeds and (2) an improvement in light buffet onset measurement capability at subsonic/transonic speeds in the tunnel. However, the noise level in the PW test section is still high. Acoustic treatment of the plenum chamber aimed at mitigating the low-frequency tone observed in the PW test section is planned as a follow-on action. (CSA)

Item Type: Article
Additional Information: Copyright for this article belongs to AIAA
Uncontrolled Keywords: Blowdown wind tunnels;Flow stability;Aerodynamic characteristics;Turbulent boundary layer;Aerodynamic noise;Acoustic excitation;Performance assessment;Pressure distribution;Mach number
Subjects: AERONAUTICS > Aerodynamics
Depositing User: M/S ICAST NAL
Date Deposited: 08 Sep 2006
Last Modified: 24 May 2010 04:20
URI: http://nal-ir.nal.res.in/id/eprint/2650

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