Abstract
The dual-jet air curtain is a novel technology that, acting as a fluidic spoiler, can not only reduce aerodynamic noise but also, compared with a single-jet air curtain, can be designed to have low self noise. To achieve further progress, this paper proposes a combined use of the dual-jet air curtain with a perforated fairing. The concept was evaluated with wind tunnel experiments using tandem rods acting as an aerodynamic bluff body noise source creating suitably high amplitude narrowband and broadband noise output. In the experiment, two configurations of the combined use were tested, i.e. the fairing was located either upstream or downstream to the rods. It was found that the two technologies complement each other with the dual-jet air curtain reducing the high frequency turbulent shear layer noise emitted from the edge of the perforated fairing, whilst the perforated fairing serves to reduce the velocity of recirculating flow in the lee of the aircurtain, thus reducing this potential aerodynamic noise source.
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