... chains of small, alternating vortex pairs, and the pressure distribution differs significantly from a plane wave solution. 14 10 2011 21 02 2012 19 04 2012 20 04 2012 bassoon numerical acoustics musical acoustics aeroacoustics compressible Navier-Stokes equations...

... 6 7 8 9 ). aeroacoustics cavitation compressible flow confined flow convection finite difference methods flow simulation Mach number Navier-Stokes equations nozzles shear turbulence vortices 04 08 2009 10 06 2010 03 12 2010 03 12 2010 2010...

... 2007 18 01 2010 14 05 2010 14 05 2010 aeroacoustics aerodynamics boundary layers drag external flows finite volume methods flow sensors flow simulation geometry mesh generation vehicles wind tunnels Flow induced noise or wind noise in ground vehicles caused...

... a beneficial effect on the fan aeroacoustic signature as a result of the changes they induce in tip-leakage-flow behavior. The aerodynamic merits of the proposed blade-tip concepts are investigated by experimental and computational studies in a fully ducted configuration. The flow mechanisms in the blade-tip...

... passing frequency as a consequence of the strong interaction between the flow discharged from the impeller and the volute tongue. In this study, a previously published aeroacoustic prediction methodology ( Cho, Y., and Moon, Y.J., 2003, “Discrete Noise Prediction of Variable Pitch Cross-Flow Fans...

... planform cavity with the aim of attenuating the aeroacoustic signature. Experiments were performed in an intermittent suck-down transonic wind tunnel by using a typical open flow rectangular planform cavity, which was modularly designed such that the leading and trailing edge geometries could be modified...

...Stéphane Moreau; Douglas Neal; John Foss The aeroacoustic measurements in the large anechoic wind tunnel of Ecole Centrale de Lyon, which previously focused on the wall pressure distribution and the far-field acoustic pressure, are extended to velocity measurements by hot-wire probes in the nozzle...

.... 26 08 2003 28 03 2005 08 04 2005 fluid oscillations aeroacoustics supersonic flow Mach number pipe flow flow visualisation shock wave effects vortices shear flow flow instability Cavity-Induced Oscillations Supersonic Flow Mode Shifts Shear Layer Instability L/D...

... is the aeroacoustic optimization of high speed centrifugal fans. We present in this paper the first results, mainly aerodynamic ones, which will be used thereafter as an input data to aeroacoustic modeling. A numerical simulation tool was used in order to determine the kinematics and the dynamics of these flows...

... one revolution of the impeller. The present method is applied to the uniform and random pitch fans to investigate their performance and aeroacoustic noise characteristics, especially the frequency modulation of the tonal noise at the blade passing frequency (BPF). Contributed by the Fluids...

.... Associate Editor: B. Schiavello. 08 June 2001 29 March 2002 19 08 2002 pumps pressure measurement fluctuations aeroacoustics pressure transducers When operating at off-design conditions, the impellers of centrifugal pumps with volute casings are subjected to some static...

.... 01 February 2001 21 February 2002 19 08 2002 boundary layer turbulence laminar to turbulent transitions pulsatile flow laminar flow aeroacoustics rocket engines In a solid rocket motor, it is both difficult and expensive to investigate the dynamic gas behavior...

... . Manuscript received by the Fluids Engineering Division July 23, 2001; revised manuscript received January 24, 2002. Associate Editor: T. Gatski. 23 July 2001 24 January 2002 28 05 2002 aerodynamics aircraft flow separation Navier-Stokes equations aeroacoustics noise abatement...

...S. Kouidri; T. Belamri; F. Bakir; R. Rey Several applications were carried out in order to validate the method presented in Part I. In Part II, two examples of these applications are presented; one relating to the aeroacoustics of the axial fans and the other one to the interaction impeller-volute...

... manuscript received December 11, 2000. Associate Editor: B. Schiavello 12 August 1999 11 December 2000 aerodynamics aeroacoustics rotors Forward-curved blades centrifugal fans usually exhibit instability phenomena, which reduce their operating range. A basic feature...

... on Cavity Noise with Emphasis on Benchmark Data to Validate Computational Aeroacoustic Codes,” NASA Contractor Report No. 4653. Karamcheti, K., 1955, “Acoustic Radiation from Two-Dimensional Rectangular Cutouts in Aerodymanic Surfaces,” NACA Report No. TN 3487. NASA Tech. Briefs, 1996, “Study...