Trailing-Edge Blowing for Reduction of Turbomachinery Fan Noise

Brookfield, J. M.; Waitz, Ian A.

doi:10.2514/2.5531

Cited by 48 publications

(20 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An example of a passive flow control technology is the chevron mixer for jet noise reduction [14]. An example of an active flow control technology is trailing edge blowing [15]. When considering how to classify noise-by-flow control technologies Thomas et al [13] and Joslin et al [16] base classification on the nature of the linkage between the underlying flow physics and the noise generation mechanisms.…”

Section: Introductionmentioning

confidence: 99%

End-plate for noise-by-flow control in axial fans

Corsini

Sheard²

2013

Per. Pol. Mech. Eng.

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

End-plate for noise-by-flow control in axial fans

Corsini

Sheard²

2013

Per. Pol. Mech. Eng.

View full text Add to dashboard Cite

show abstract

“…Injection from the TE into the wake or flow suction from the boundary layer upstream of the TE has been of main interest. [39][40][41][42][43][44] The listed studies are either limited to low Reynolds number or to only the far field noise, 39 where it was shown that AFC can be a suitable candidate for far field noise reduction by reporting several decibels of achieved noise reduction. Detailed studies on the effect of the AFC on turbulence, and therefore on the generation of TE noise are required to find an effective way to reduce the TE noise.…”

mentioning

confidence: 99%

Active Flow Control Methods for the Reduction of Trailing Edge Noise

Szoke

Azarpeyvand

2017

23rd AIAA/CEAS Aeroacoustics Conference

View full text Add to dashboard Cite

General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. The possibility of trailing edge noise reduction using active flow control is addressed in this paper. The boundary layer is altered with the help of uniform perpendicular and inclined flow injection and suction on a long flat plate upstream of a sharp trailing edge. The flow quantities have been measured using particle image velocimetry, hot-wire anemometry, and the surface pressure fluctuations using flush mounted miniature pressure transducers. It was shown that the proposed flow control methods are capable of reducing the noise over a wide range of frequencies. It was also revealed that the perpendicular blowing is effective in shifting the energy containing turbulent structures away from the wall, resulting in a significant reduction in the surface pressure spectra. The inclined blowing control method was capable of further reducing the surface pressure spectra, while maintaining low input power requirement. The perpendicular suction control was shown to be effective in the reduction of pressure fluctuations in the mid frequency regions, which quickly penetrates to the lower frequency downstream. The inclined suction control has also lead to significant reductions in the surface pressure fluctuations over a wide range of frequencies, while the required suction rate was kept considerably low. It has also been shown that the proposed active flow control methods can reduce the spanwise correlation length of the turbulent structures near the trailing edge. In general, results have shown that all proposed active flow control techniques can effectively alter the boundary layer structure and reduce trailing edge noise. Nomenclature

show abstract

“…More recently. Brookfield and Waitz [24] demonstrated on a 1/6-scale high-bypass-ratio fan stage that the TEB was effective for reducing the rotor wakes and their mean harmonic amplitudes.…”

Section: Teb Technique To Reduce Hcfmentioning

confidence: 99%

“…In effect, trailing edge blowing from stator vanes or rotor blades has been successfully demonstrated as a new method to reduce engine fan noise in a realistic rotating environment [19,24,25].…”

Section: Introductionmentioning

confidence: 99%