Rotor wake characteristics relevant to rotor-stator interaction noise generation

Shaw, L. M.; Balombin, J. R.

doi:10.2514/3.44797

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Some wake data have been obtained as functions of downstream distance on a fan operated with forward velocity in an anechoic wind tunnel (46). Mean wake stator upwash velocity profiles are shown in Fig.…”

Section: Radialmentioning

confidence: 99%

Aircraft Turbofan Noise

Groeneweg

Rice

1983

Volume 5: Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; Process Industries

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Recent advances in the understanding of turbofan noise generation and suppression in aircraft engines are reviewed with particular emphasis on NASA research. The review addresses each link in the chain of physical processes which connect unsteady flow interactions with fan blades to far field noise. Mechanism identification and description, duct propagation, radiation and acoustic suppression are discussed. Recent advances in the experimental technique of fan inflow control assure that in-flight generation mechanisms are not ma.,ked by extraneous sources in static tests. Rotor blade surface pressure and wake velocity measurements aid the determination of the types and strengths of the generation mechanisms. Approaches to predicting or measuring acoustic mode content, optimizing treatment impedance to maximize attenuation, translating impedance into porous wall structure and interpreting far field directivity patterns are illustrated by comparisons of analytical and experimental results. A persistent theme of the review is the interdependence of source and acoustic treatment design to minimize far field noise. Areas requiring further research are discussed and the relevance of aircraft turbofan results to quieting other turbomachinery installations is addressed.

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Section: Radialmentioning

confidence: 99%

Aircraft Turbofan Noise

Groeneweg

Rice

1983

Volume 5: Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; Process Industries

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Investigation of axial spacing effect on noise radiation generated by rotor-stator interaction

SHU

Wang

et al. 2023

J Mech Sci Technol

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Evaluation and Prediction of Blade-Passing Frequency Noise Generated by a Centrifugal Blower

Ohta

Outa

Tajima

1994

Volume 1: Turbomachinery

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The blade-passing frequency noise, abbreviated to BPF noise, of low specific speed centrifugal blower is analyzed by separating the frequency-response of the transmission passage and the intensity of the noise source. Frequency-response has previously been evaluated by the authors using a one-dimensional linear wave model, and the results have agreed well with the experimental response in a practical range of the blower speed. In the present study, the intensity of the noise source is estimated by introducing the quasi-steady model of the blade wake impingement on the scroll surface. The effective location of the noise source is determined by analyzing the cross-correlation between measured data of the blower suction noise and pressure fluctuation on the scroll surface. Then, the surface density distribution of a dipole noise source is determined from pressure fluctuation expressed in terms of quasi-steady dynamic pressure of the traveling blade wake. Finally, the free-field noise level is predicted by integrating the density spectrum of the noise source over the effective source area. The sound pressure level of the blower suction noise is easily predicted by multiplying the free-field noise level by the frequency-response characteristics of the noise transmission passage.

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Rotor wake characteristics relevant to rotor-stator interaction noise generation

Cited by 5 publications

References 7 publications

Aircraft Turbofan Noise

Aircraft Turbofan Noise

Investigation of axial spacing effect on noise radiation generated by rotor-stator interaction

Evaluation and Prediction of Blade-Passing Frequency Noise Generated by a Centrifugal Blower

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