Abstract
Hot-wire measurements are perfomed on linear 3D acoustic receptivity in a two-dimensional laminar boundary layer. A localized quasi steady surface roughness serves as the receptivity element. A plane acoustic wave with frequency f ac scatters at this vibrating source and the generated TS-wave train is measured downstream in spanwise cuts and at combination frequencies (f 1,2 = f ac ∓ f v ). After Fourier decomposition linear stabiltity theory is used for upstream extrapolation to the initial amplitudes at the roughness element. The dispersion characteristic is determined and the complex receptivity function is calculated by normalization of the initial TS-spectra with the related amplitudes and phases of the surface vibrator and the acoustics. The results are compared with Direct Numerical Simulations based on a vorticity-velocity formulation of the complete Navier-Stokes equations and a new embeded wall model. Good overall agreement is achieved.
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© 2000 Springer-Verlag Berlin Heidelberg
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Würz, W., Herr, S., Wörner, A., Rist, U., Wagner, S., Kachanov, Y.S. (2000). Study of 3D Wall Roughness Acoustic Receptivity on an Airfoil. In: Fasel, H.F., Saric, W.S. (eds) Laminar-Turbulent Transition. IUTAM Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-03997-7_11
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DOI: https://doi.org/10.1007/978-3-662-03997-7_11
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