抄録
Jet aircraft engines produce a substantial amount of jet mixing noise. Flow control by a claw mixer is one of the countermeasures to mitigate the jet noise. The claw, composed of retractable nails at the nozzle end of the engine, controls flow and enhances jet mixing with the surrounding flow. In the previous test, the nail configuration-60° inclination relative to the jet and 30% penetration of nozzle diameter-managed to suppress jet mixing noise to some extent. However, this configuration generated additional noise at higher frequencies. In this study, large eddy simulation analysis was used to better understand flow control by nail. Subsequently, scale-model testing of revised configurations, with shallower incident angles and less penetration, was carried out.
