Abstract
Experimental studies on a wall‐mounted cavity in laminar and turbulent subsonic flow provide new insights into mechanisms of tone generation as wind speed is varied. Contributions to tone generation from turbulent boundary layer fluctuations, acoustic background noise, sheartone feedback coupling, and cavity resonator feedback coupling, respectively, can now be quantitatively sorted out on the basis of theoretical models. Effect of turbulent eddy size on random‐noise cavity excitation is found to agree qualitatively with wave filter hypothesis, A new theory of laminar pipetones will be presented which is similar to but complements an earlier model of turbulent pipetones. This includes an improved method of estimating phase velocity of interface waves at pipetone resonance frequencies. [The work was supported by a GHR contract with the Naval Ship Systems Command, administered by the David W. Taylor Naval Ship Research and Development Center, Carderock, MD.]
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