Microjet control for flow and noise reduction in automotive applications

The present invention comprises a method and associated devices for reducing the noise produced by an open cavity within a moving automobile (such as open sunroofs and open windows). The invention proposes placing microjet orifices proximate the open cavity. These inject small but rapidly moving columns of air into the prevailing flow. The projected columns reduce the formation of large coherent structures in the prevailing flow. As these large coherent structures are a critical component of the resonance which is responsible for much of the noise produced across the open cavity, the overall noise level is reduced by the microjets.