Wake excited resonances in an annular cascade: An experimental investigation

Parker, Robert L.; Pryce, David

doi:10.1016/s0022-460x(74)80331-7

Cited by 27 publications

(16 citation statements)

References 6 publications

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“…Indeed, it is argued by Arbey [13] that an incident turbulence intensity of T u 2:5% suppresses the Tollmien-Schlichting waves on an isolated airfoil. Another possible explanation is a cascade resonance [15][16][17]. The tonal noise of the cascades has not been further investigated because it is out of the scope of the present study.…”

Section: U Xdmentioning

confidence: 99%

Experimental Validation of a Cascade Response Function for Fan Broadband Noise Predictions

Posson

Roger

2011

AIAA Journal

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The present paper is aimed at assessing an analytical prediction model for the broadband noise produced by the impingement of turbulence on a cascade, using a dedicated experiment. The model is a strip-theory approach based on a previously published formulation of the unsteady blade loading for a rectilinear cascade. The experimental setup is made of a single stationary cascade of vanes mounted downstream of a turbulence grid in an annular duct, at the exit of an open-jet anechoic wind tunnel. The statistical parameters of the turbulence measured with hot-wire anemometry are used as input data in the model. The in-duct predicted downstream acoustic power is compared with the measured power obtained from the far-field acoustic pressure. Measured and predicted variations of the acoustic power with the number of vanes of the cascade and with the turbulence intensity are found to be in good agreement. It is concluded that the analytical approach succeeds in highlighting three-dimensional effects and is promising for further comparisons in more complex annular configurations. = squared norm of the duct eigenfunction E m; = microphone angle in the horizontal plane P containing the center of the exhaust section = turbulence integral length scale 0 = exponential correction factor of the turbulence spectrum 0 = fluid density = interblade phase angle uu ! = power spectral density of the streamwise velocity ww K; r = three-dimensional wave-number turbulence spectrum for the vane normal velocity component divided by u 2 rmŝ ' = sweep angle in the duct reference framê = stagger angle in the duct reference frame m;= eigenvalue of the mode m;

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Section: U Xdmentioning

confidence: 99%

Experimental Validation of a Cascade Response Function for Fan Broadband Noise Predictions

Posson

Roger

2011

AIAA Journal

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“…Typical examples of industrial equipments, which often experience flow-excited acoustic resonance, include tube bundles of heat exchangers and boiler plants (Fitzpatrick, 1986;Blevins and Bressler, 1993;Oengoeren and Ziada, 1998;Ziada, 2006), cascades of compressor blades (Parker and Pryce, 1974;Stoneman et al, 1988;Ziada et al, 2002), control valves (Ziada et al, 1989), and piping systems (Hourigan et al, 1990;Bruggeman et al, 1991;Ziada et al, 2006). The sound pressure generated by the resonant acoustic modes can be sufficiently high to cause structural failures, such as that reported recently for the steam dryer of BWR (NRC, 2003).…”

Section: Introductionmentioning

confidence: 99%

Flow-excited acoustic resonance of two side-by-side cylinders in cross-flow

Hanson

Mohany

Ziada

2009

Journal of Fluids and Structures

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“…The former is excited by vortices shed from the orifice leading edge over the cavity, and often occurs in landing-gears, weapon bays in aircraft, and open cavities in moving vehicles. The latter is caused by vortex shedding from a bluff body in crossflows and is frequently seen in tube or plate bundles of heat exchangers and boilers, 7 cascades of compressor blades, 8 and guide/turning vanes in ducts and radial diffusers. 9 Flowinduced acoustic resonance may induce an acoustic pressure amplitude sufficiently high to cause very serious noise or vibration problems.…”

Section: Introductionmentioning

confidence: 99%

Asynchronous control of vortex-induced acoustic cavity resonance using imbedded piezo-electric actuators

Zhang

Zhou

2009

The Journal of the Acoustical Society of America

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This paper presents an experimental investigation of the control of a vortex-induced acoustic cavity resonance from flow over a bluff body using embedded piezo-ceramic actuators in order to alter the resonant flow-acoustic interactions. The action of the actuators was asynchronous. Experiments were mainly conducted at the flow velocity of acoustic resonance, where the vortex shedding frequency from the upstream bluff body approached the frequency of the first acoustic mode of two downstream cavities. The fluctuating acoustic pressure was measured using a microphone. The perturbed flow field around the bluff body was monitored using two single hot wire anemometers and one X-wire. It was found that the induced transverse vibrations were effective to reduce the acoustic resonance. The cavity sound pressure level at resonance was reduced by 8.2 dB in presence of actuation. The physics behind the control mechanism is discussed.

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Wake excited resonances in an annular cascade: An experimental investigation

Cited by 27 publications

References 6 publications

Experimental Validation of a Cascade Response Function for Fan Broadband Noise Predictions

Experimental Validation of a Cascade Response Function for Fan Broadband Noise Predictions

Flow-excited acoustic resonance of two side-by-side cylinders in cross-flow

Asynchronous control of vortex-induced acoustic cavity resonance using imbedded piezo-electric actuators

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