Mass injection for reducing flow-induced resonance in a cavity

摘要

A method and system are provided for reducing flow-induced resonance in a cavity of a structure. At least one pair of diaphragms are mounted in a housing and separated from one another such that a chamber is formed therebetween within the housing. A first diaphragm of the pair of diaphragms is oscillated in accordance with a time-varying function. A second diaphragm of the pair of diaphragms is oscillated inversely to the first diaphragm so that pressure in the chamber formed therebetween changes in correspondence with the time-varying function. The chamber is vented at a position flush with the surface of the structure along the leading edge of the cavity. As a result of such venting, the pressure in the chamber that changes in correspondence with the time-varying function introduces a corresponding time-varying disturbance into the shear layer along the leading edge of the cavity. The time-varying disturbance reduces the energy that is available in the shear layer that can interact adversely with the cavity to generate resonance.