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Download Aero- and Hydro-Acoustics: IUTAM Symposium, Ecole Centrale by Harold Levine (auth.), Prof. Geneviève Comte-Bellot, Prof. PDF

By Harold Levine (auth.), Prof. Geneviève Comte-Bellot, Prof. John E. Ffowcs Williams (eds.)

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E. (1974). Unsteady vortical and entropic disturbances 19 round arbitrary obstacles. J. Fluid Mech. 89 (1978 ) 433-468. 5. J. R. Effect of airfoil mean loading on convected gust interaction noise. AIAA Paper No. 84-2324 (1984) • 6. J. R. Equation governing linearized disturbances of a perfect-gas base flow. mitted) 7. AIAA J. (to be sub- (1985). E. H. Aerodynamic sound gen- eration by turbulent flow in the vicinity of a scattering half plane. J. Fluid Mech. 40 8. (1970) 657-670. J. R. Effect of incidence angle on noise generated by airfoils interacting with high-frequency convected gusts.

From this, as must be expected, one can see that determining characteristic parameters of unsteady flows on the basis of streaklines is problematic. ----~ o o o o o o -1 -2 o Velocity maximum Streak line x XX -3~----~----~----~----~----~--~ o 10 20 30 x/eo 40 50 60 Fig. 7. Location of the maximum perturbation velocity and mean deflection of the streakline as a function of the distances from the trailing edge. dV The vorticity of a 2-dimensional flow is given b y dX - dU dy. The second term of the sum is the derivative with respect to y of the measured velocity field.

The pressure amplitudes e = 70° (= U for 90° ) in figure 6, are ~p in values of order plotted to see the scaling law by the relation log where the parameters square method. 2. This behavior is not far from the theoretical scaling law: p oc u 3 . 05 • SEmi-infinite plate o Finite edge plate .. 5. Fourier coefficient -bl(t) for various values of U. 6. Scaling law: log ( ~p) vs. log U. 4. An edge plate Figure 8 shows a perspective wave generated by the vortex moving near the finite edge plate (Fig.

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