Characterization of freestream disturbances in conventional hypersonic wind tunnels

Lian Duan, Meelan M. Choudhari, Amanda Chou, Federico Munoz, Syed Raza Christopher Ali, Rolf Radespiel, Thomas Schilden, Wolfgang Schröder, Eric C. Marineau, Katya M. Casper, Ross S. Chaudhry, Graham V. Candler, Kathryn A. Gray, Cameron J. Sweeney, Steven P. Schneider

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


While low disturbance (“quiet”) hypersonic wind tunnels are believed to provide more reliable extrapolation of boundary layer transition behavior from ground to flight, the presently available quiet facilities are limited to Mach 6, moderate Reynolds numbers, low freestream enthalpy, and subscale models. As a result, only conventional (“noisy”) wind tunnels can reproduce both Reynolds numbers and enthalpies of hypersonic flight configurations, and must therefore be used for flight vehicle test and evaluation involving high Mach number, high enthalpy, and larger models. This article outlines the recent progress and achievements in the characterization of tunnel noise that have resulted from the coordinated effort within the AVT-240 specialists group on hypersonic boundary layer transition prediction. New Direct Numerical Simulation (DNS) datasets elucidate the physics of noise generation inside the turbulent nozzle wall boundary layer, characterize the spatiotemporal structure of the freestream noise, and account for the propagation and transfer of the freestream disturbances to a pitot-mounted sensor. The new experimental measurements cover a range of conventional wind tunnels with different sizes and Mach numbers from 6 to 14 and extend the database of freestream fluctuations within the spectral range of boundary layer instability waves over commonly tested models. Prospects for applying the computational and measurement datasets for developing mechanism-based transition prediction models are discussed.

Original languageEnglish (US)
Title of host publicationAIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105241
StatePublished - Jan 1 2018
EventAIAA Aerospace Sciences Meeting, 2018 - Kissimmee, United States
Duration: Jan 8 2018Jan 12 2018

Publication series

NameAIAA Aerospace Sciences Meeting, 2018


OtherAIAA Aerospace Sciences Meeting, 2018
CountryUnited States

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    Duan, L., Choudhari, M. M., Chou, A., Munoz, F., Ali, S. R. C., Radespiel, R., Schilden, T., Schröder, W., Marineau, E. C., Casper, K. M., Chaudhry, R. S., Candler, G. V., Gray, K. A., Sweeney, C. J., & Schneider, S. P. (2018). Characterization of freestream disturbances in conventional hypersonic wind tunnels. In AIAA Aerospace Sciences Meeting (210059 ed.). (AIAA Aerospace Sciences Meeting, 2018; No. 210059). American Institute of Aeronautics and Astronautics Inc, AIAA.