Powered resonance tubes: resonance characteristics and actuation signal directivity

Studies on conical and cylindrical resonators

“…These local minima positions are independent of geometry or cavity length. Similar oscillatory trend was reported by Sarpotdar et al [8] for a cylindrical cavity of length L = 0.2D res and pressure ratio R = 4.29, and the results are shown for comparison in Fig. 10.…”

“…They also provided the detailed characterization of the unsteady pressures in the near field. The parametric study of Sarpotdar et al [8] revealed that the characteristic frequency at which the cavity resonates shows a small variation with stand-off distance. They observed that while the fundamental frequency was directive in the downstream angles, the harmonics were directive at perpendicular and upstream angles.…”

“…As discussed earlier, the frequency of conical cavity is higher compared to cylindrical cavity for all cavity lengths. The experimental results of Sarpotdar et al [8] for cylindrical cavity for the conditions R = 4.29 and S/D res = 1.5 have been plotted for comparison. It is evident that present results closely match those of Sarpotdar et al [8].…”

Numerical Simulations of Self-Oscillatory Flows near Blunted Bodies, Giving off Opposite Jets

“…A jet cavity interactions (see, for example, [1][2][3][4][5]) are known to have self-oscillatory regimes. Papers [1][2][3][4] are devoted to investigations of various aspects of main frequencies dependences on geometrical parameters of jets and environments.…”

“…Papers [1][2][3][4] are devoted to investigations of various aspects of main frequencies dependences on geometrical parameters of jets and environments. Kastner and Samimy [5] studied a Hartmann cavity in which the region between the jet and the cavity is shielded partly.…”