Tonal and Silent Wake Modes of a Square Rod at Incidence

作者：Domeanu J F^*; Mueller A^*; Rambaud P^*; Weide E T A V D^*; Hirschberg A^*

来源：Acta Acustica United with Acustica, 2016, 102(3): 419-422.

DOI：10.3813/AAA.918959

The tonal sound produced by a rod with square cross section placed with its axis normal to a uniform subsonic flow has been measured. The angle of incidence of the flow with respect to the basis of the cross section has been varied. The most interesting deviation between literature and the present experiments is the appearance of a silent wake mode. This silent mode appears by default when the wind tunnel is started for angles between 25 and 65 degree. It is metastable, an upstream perturbation, from small perturbations to hand waving, triggers the tonal wake mode. By perturbing the flow in wake of the rod, the silent mode can be recovered. The tonal mode appears spontaneously for angles between -25 and 25 degree. For the tonal mode we compare the measured oscillation frequency and radiated pressure amplitude with literature data. Some small, but significant, differences are observed.

• 出版日期2016-6