Experimental study on the noise reduction of an industrial forward-curved blades centrifugal fan

Qi, Datong; Mao, Yijun; Liu, Xiaoliang; Minjian, Yuan

doi:10.1016/j.apacoust.2009.03.002

Cited by 45 publications

(15 citation statements)

References 26 publications

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“…It should also be noted that the effectiveness of the inclined tongues in reducing the tonal noise component is already confirmed in the case of a FC fan with relatively large inlet and outlet diameters (refer to Ref. [10]). In addition to the numerical simulations, experimental measurements were performed to find the answer of the second question.…”

Section: Resultsmentioning

confidence: 88%

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Numerical and Experimental Study on the Tonal Noise Generation of a Radial Fan

Darvish

Frank

Paschereit

2015

Journal of Turbomachinery

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The main focus of this work is on the geometrical modifications can be made to the fan wheel and to the volute tongue of a radial fan to reduce the tonal noise. The experimental measurements are performed by using the in-duct method in accordance with ISO 5136. In addition to the experimental measurements, CFD (computational fluid dynamics) and CAA (computational aeroacoustics) simulations are carried out to investigate the effects of different modifications on noise and performance of the fan. It is shown that by modifying the blade outlet angle, the tonal noise of the fan can be reduced without impairing its aerodynamic performance. Moreover, it is indicated that increasing the number of blades leads to a significant reduction in the tonal noise and also an improvement in the aerodynamic performance. However, this trend is only valid up to a certain number of blades, and a further increment might reduce the aerodynamic performance of the fan. Besides modifying the impeller geometry, new volute tongues are designed and tested on the rig. It is demonstrated that the shape of the volute tongue plays an important role in the tonal noise generation of the fan. Moreover, in order to find out whether or not it is possible to reduce the tonal noise level through a destructive phase-shift generation, stepped tongues are comprehensively investigated by means of numerical simulations and experimental measurements.

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Section: Resultsmentioning

confidence: 88%

“…Changing the cutoff height is another parameter which is reported to affect the tonal noise of the fan, in particular when the cutoff has a straight shape [9]. Inclining either the impeller blades or the cutoff geometry is also addressed as an effective method in reducing the tonal noise of the FC fans [2,10,11].…”

Section: Introductionmentioning

confidence: 98%

Numerical and Experimental Study on the Tonal Noise Generation of a Radial Fan

Darvish

Frank

Paschereit

2015

Journal of Turbomachinery

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“…This paper presents experimental studies of cavitation noise, its spectrum, specific conditions and method of reduction without affecting on flow conditions. Similar publications can be found where authors describe flow noise emitted from pipes during turbulent conditions and pressure fluctuations [10][11][12][13][14][15][16][17]. More acoustical measurements are performed in publications [18][19][20], where cavitation noise is considered.…”

Section: Introductionmentioning

confidence: 86%

Reduction of acoustic cavitation noise emission with textile materials

Nering

2018

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This article presents an examination of the acoustic noise level reduction in piping applications. Hydraulic cavitation is the source of the noise. In order to determine the noise level drop for the insulating material arranged around the pipe-cylindrical geometry-the acoustic spectrum was measured in the range of audible frequencies. Measurements were made for textile materials stacked with varying amounts of layers around the source of noise. There was a decrease in the noise level characteristics for mass law. An empirical formula describing the relative noise reduction for the materials under study was proposed.

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“…They explained this reduction by a phase cancellation mechanism. More recently, Datong et al [4] and Gu et al [5] have experimentally confirmed that the modification of the shape of the tongue is an efficicient way for decreasing the tonal noise radiated by centrifugal fans. On the same type of machine, Cai et al [6] have proven that such a decrease of the tonal noise is adequatly predicted thanks to a URANS calculation with the Ansys CFX software and the use of an acoustic analogy theory in order to calculate the sound radiation.…”

Section: Introductionmentioning

confidence: 96%

Aeroacoustic Analysis of the Tonal Noise of a Large-Scale Radial Blower

Marsan

Moreau

2017

Journal of Fluids Engineering

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Large-scale radial blowers are widely used in factories and are one of the main sources of noise. The present study aims at identifying the noise generation mechanisms in such a radial blower in order to suggest simple modifications that could be made in order to reduce the noise. The flow in a representative large-scale radial blower is investigated thanks to unsteady Reynolds-averaged Navier–Stokes (URANS) numerical simulations. The radiated noise is calculated, thanks to an in-house propagation code based on the Ffowcs Williams Hawkings' (FWH) analogy, SherFWH. The results highlight the main noise generation mechanisms, in particular the interaction between the rotating blades and the tongue, and the interaction between the rotating blades and the trapdoors located on the volute sidewall. Some modifications of the geometry are suggested.

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Experimental study on the noise reduction of an industrial forward-curved blades centrifugal fan

Cited by 45 publications

References 26 publications

Numerical and Experimental Study on the Tonal Noise Generation of a Radial Fan

Numerical and Experimental Study on the Tonal Noise Generation of a Radial Fan

Reduction of acoustic cavitation noise emission with textile materials

Aeroacoustic Analysis of the Tonal Noise of a Large-Scale Radial Blower

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