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- W2325755309 abstract "An experimental and computational investigation of the e ect of novel uidic enhancement of mechanical chevrons deployed on a conical converging diverging scale military style nozzle was completed. An overexpanded, isothermal jet was used as the primary ow and several injection schemes were tested. Air was employed as the injection uid and the injection quantities were limited to pressures and mass ow rate ratios that were representative of available inight quantities. The optimum injection scheme resulted in reduction of fareld noise by an average of 2.5dB in overall sound pressure level as compared to mechanical chevrons alone, while reducing the required mass ow ratio to 1% of the main jet. Spectral results showed reduction in screech tone and broadband shock associate noise with minimal high frequency penalty typical of penetrating noise reduction devices. Flow eld results were able to link the acoustic changes to the modi cations insited by the uidic injection. The optimum con guration shortened the potential core, reduced the shock cell stength, shortened the shock cell spacing, nearly doubled the spreading rate in the upstream region, and reduced the centerline peak turublence while increaseing the peak turublence levels in the shear layer." @default.
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- W2325755309 date "2012-01-09" @default.
- W2325755309 modified "2023-09-23" @default.
- W2325755309 title "Fluidic Enhancement of Mechanical Chevrons using Novel Schemes" @default.
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- W2325755309 doi "https://doi.org/10.2514/6.2012-245" @default.
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