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- W2736815460 abstract "In the wind-tunnel testing of laminar flow airfoils, it is generally considered that the turbulence intensity of the facility must be less than 0.08 percent to obtain aerodynamic performance measurements that are representative of those obtained in flight. Turbulence intensity is the measure of velocity fluctuations in the flow relative to the mean flow velocity. Wind-tunnel turbulence intensity provides an estimate of the amplitudes of freestream disturbances in the flow. Although, it has been known for a long time that the process of transition from a laminar to a turbulent boundary layer is also dependent on the frequency of freestream disturbances, rather than just the amplitude, there is usually no consideration of the frequency spectrum in the assessment of a wind-tunnel test. This thesis presents a consideration of the reliability of measurements made in the Penn State Low-Speed, Low-Turbulence (LSLT) Wind Tunnel with regard to the frequency spectrum. The en method for transition prediction is used to find the critical frequencies for boundary-layer transition on several airfoils tested in the tunnel for different flow speeds and angles of attack. These results are compared to the freestream frequency spectrum of the tunnel at those speeds. On the basis of the findings, the reliability of the aerodynamic measurements made at the Penn State LSLT Wind Tunnel is ascertained." @default.
- W2736815460 created "2017-07-31" @default.
- W2736815460 creator A5055428551 @default.
- W2736815460 date "2011-08-04" @default.
- W2736815460 modified "2023-09-23" @default.
- W2736815460 title "QUALIFICATION OF AIRFOIL TRANSITION MEASUREMENTS TAKEN IN THE PENN STATE LOW-SPEED, LOW-TURBULENCE WIND TUNNEL" @default.
- W2736815460 hasPublicationYear "2011" @default.
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