Abstract
The paper continues the JFI effect investigation started in a previous work. Experimental and numerical investigations of jet-flap interaction (JFI) are carried out for a typical wing model with installed dual-stream nozzle. Baseline case and several modified configurations are considered in order to assess their capability to reduce JFI noise. Two types of JFI reduction methods are considered – jet flow modification (chevrons or corrugations) and airframe surface modification (flap deflection angle, thrust gate). It was demonstrated that reduction efficiency is strongly related to the relative position of the flap with respect to the jet in the presence of co-flow. Experimental investigations included PIV measurements of jet velocity field and farfield acoustic measurements. Numerical simulation of the near-field of baseline configurations is conducted with MILES CABARET-FD code.
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