Abstract
A Bluebell nozzle design concept is proposed for jet noise reduction with minimal thrust loss or even thrust augmentation. A Bluebell nozzle has a sinusoidal lip-line edge (chevrons) and a sinusoidal cross-section shape with linear amplitude increasing downstream in the divergent nozzle part (corrugations). The experimental tests of several Bluebell nozzle designs have shown noise reduction relative to a convergent-divergent round nozzle with design exhaust Mach number M e = 1.5. The best design provides an acoustic benefit near 4 dB with about 1% thrust augmentation. For subsonic flow (M e = 0.6), the tests indicated that the present method of design for Bluebell nozzles produces increased levels of jet noise. The proposed designs incorporate analytical theory and two- and three-dimensional numerical simulations. Full Navier-Stokes and Euler solvers were utilized. Boundary layer effects were used. Several different designs were accounted for in the Euler applications.
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