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- W41534072 abstract "The properties of the boundary-layer over a at plate have been investigated analytically, experi-mentally and numerically employing XFOIL. With the theory from Blasius and von K�arm�an, theboundary-layer properties over an in�nitesimally thin at plate have been investigated analytically. A�nite thickness plate, designed to behave aerodynamically as a at plate, with a Hermite polynomialleading edge and a trailing edge corresponding to the last 70% of a NACA 4-series airfoil section, hasbeen analyzed with XFOIL and has been investigated mounted at zero angle of attack in the SilentWind Tunnel of the University of Twente.Initial measurements have been performed to obtain the drag force and velocity pro�le. The dragforce was measured with load cells and the velocity pro�le was determined with a Pitot tube anda single-wire Hot Wire probe (55P11) at various Reynolds numbers. The measurements indicate adelayed transition from laminar to turbulent ow at a Reynolds number around Recrit=3�106 insteadof the expected Recrit=5�105. Leading-edge turbulence strips were also applied in order to investigatethe drag force and the transitional boundary layer.The found delayed transition is unfavourable for further research on the inuence of the surfaceroughness on transition because of the maximum velocity achievable in the Silent Wind Tunnel. Sincethe turbulence level of the Silent Wind Tunnel is relatively low (approximately 0.25%), other possibil-ities have been investigated on the cause of the delayed transition. Results of numerical simulationsusing XFOIL indicated that a small change in the streamwise pressure gradient can delay transitionsubstantially. Therefore, additional measurements have been performed on the streamwise pressuregradient in the Silent Wind Tunnel. These results indicate an existing streamwise pressure gradientin the test section of the Silent Wind Tunnel which is ampli�ed when the plate is installed in the windtunnel and may have been the cause of the delayed transition." @default.
- W41534072 created "2016-06-24" @default.
- W41534072 creator A5073528055 @default.
- W41534072 date "2014-01-01" @default.
- W41534072 modified "2023-09-27" @default.
- W41534072 title "The Boundary layer over a flat plate" @default.
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- W41534072 hasPublicationYear "2014" @default.
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