Experimental Study for the Effect of Vaned Diffuser Leading Edge on the Noise Generated From a Centrifugal Fan

Zhang, Wei; Gong, Wuqi; Xi, Guang

doi:10.1115/gt2009-59706

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…Mao and Qi (2009) considered the noise of the blades is mainly originated from the vicinity of the trailing edge. Zhang et al (2009a, b) verified that the leading edge of the diffuser vane plays an important role in the impeller‐diffuser interaction through the experimental studies. Gu et al (2007) believed that the movement and shatters of the eddies also disturbed the airflow, which makes the level of pressure pulsations and noise rise.…”

Section: Introductionsupporting

confidence: 58%

“…However, the excessive energy losses, vibrations and noise generated by the fans have become a serious problem. Especially the fan noise, which consists of rotational and eddy noises at high rotational speed, is unbearable (Li et al , 2002; Zhang et al , 2009a, b; Yang et al , 2008; Xi et al , 2002). Therefore, finding the causes is the fundamentals of finding an appropriate solution.…”

Section: Introductionmentioning

confidence: 99%

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Unsteady internal flow field simulations in a double suction centrifugal fan

Yang

Meng

Zhou

et al. 2013

Engineering Computations

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Purpose -Thermal power plants have many problems regarding noise and vibration. Previous studies have shown that such problems are often related to the fans. However, the internal flows are difficult to analyze to find the cause of vibration and noise in fans in actual tests. Therefore, the unsteady internal flow field in a centrifugal fan was simulated numerical to identify the source. This paper aims to present these issues. Design/methodology/approach -The unsteady Reynolds-averaged Navier-Stokes equations with the SST k-v turbulence model were solved to simulate the flow within the entire flow path of the fan. The conservation of mass and moment and energy equations were used to solve the flow field distribution. The time-dependent pressure pulsations on the impeller were analyzed for the dynamics problem. The finite volume method with the SIMPLEC algorithm was used to discretize the time-dependent equations. The second-order upwind scheme was used for the convection terms and the central difference scheme was chosen for the diffusion terms in the momentum and transport equations. Findings -The numerical simulations illustrated the flow characteristics inside the double suction centrifugal fan. The predicted efficiency is almost the same as the experimental value. The estimated pressure and temperature fields are quite reasonable. The results showed that the interaction between the non-uniform impeller flow and the fixed volute aroused the significant pressure fluctuations, which is an important source of vibration and noise in centrifugal machinery. Research limitations/implications -It is assumed that there is no change in the density in the whole flow passage, and the predicted outlet temperature is about 1.15 per cent lower than the experimental result. Originality/value -The simulation study indicates that the prediction of noise is possible by using pressure pulsation. It is recommended to control the pressure pulsation in the fans, to decrease the vibration and noise of thermal power plants.

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Section: Introductionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Unsteady internal flow field simulations in a double suction centrifugal fan

Yang

Meng

Zhou

et al. 2013

Engineering Computations

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“…However, one of important issues, namely the influence of the diffuser leading edge on the noise of centrifugal fans, has not been considered. Previous works by the authors [11] showed that the inclined leading edge vaned diffuser (ILEVD) could reduce the fan noise. The objective of this article is to find a good geometric shape of the diffuser leading edge to reduce the noise of the centrifugal fan.…”

Section: Introductionmentioning

confidence: 99%

The influence of the geometry of the leading edge of diffuser vanes on the noise generated by a centrifugal fan

Zhang

Gong

2010

Proceedings of the Institution of Mechanical Engineers, Part A:

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An experimental study is described to investigate the influence of diffuser vane leading edge on the noise behaviour of a centrifugal fan. The geometric shapes of the diffuser vane leading edge refer to the diffuser inlet radius, and the broken and inclined leading edges. The sound pressure level and pressure rise of the centrifugal fan were measured in a semianechoic chamber. The rotational speed of the test fan varied from 20 000 to 35 000 r/min; the flow coefficient was in the range of 0.02-0.14. The results show that: (a) by using the inclined leading edge vaned diffuser (ILEVD) with proper inclined angle, the overall fan noise is reduced by 3.6 dB(A), and the fan performance is improved; (b) when the diffuser leading edge radius R 3 /R 2 increases from 1.03 to 1.07, the tones are reduced whereas the broadband noise is almost unchanged; and (c) the influence of the broken leading edge diffuser on the overall fan noise and performance is negligible, although the tonal noise is reduced by 4 dB(A). In order to better understand the behaviour of the ILEVDs, a numerical simulation has been carried out on steady three-dimensional flows. The results indicate that the flow condition improves by the application of the ILEVD.

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“…The geometry of the diffuser plays an important role in the noise generation; hence, the redesign of the vane diffuser may help reduce the interaction noise. The authors' previous work 6,7 showed that the inclined leading edge vane diffuser could reduce the fan noise and improve the fan performance.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Half Vane Diffuser on the Noise Generated from a Centrifugal Fan

Zhang

Gong

Fan

et al. 2010

Experimental Techniques

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In this paper an experimental study is conducted to investigate the influence of a half vane diffuser on the noise behavior of a centrifugal fan, used in a vacuum cleaner. The diffuser vane height h/b is varied as follows: 0 (vaneless), 0.2, 0.4, 0.6, 0.8 and 1.0 (full vane) at two diffuser inlet radii R3/R2 = 1.03 and 1.07. The experiments were carried out on a high speed centrifugal fan. The sound pressure level (SPL) and pressure rise of the centrifugal fan were measured in a semi‐anechoic chamber. The fan flow coefficient was in the range of 0.02 to 0.14, and the rotational speed of the impeller varied from 20,000 to 35,000 rpm. The experimental result shows that by using a half vane diffuser, the sound pressure levels are respectively reduced by 5.5 dB(A) and 3.5 dB(A) at R3/R2 = 1.03 and 1.07. Meanwhile, the half vane diffuser improves the fan performance and extends the flow range. The optimal value of the half vane height is about 0.6 times of the diffuser width.

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Experimental Study for the Effect of Vaned Diffuser Leading Edge on the Noise Generated From a Centrifugal Fan

Cited by 4 publications

References 9 publications

Unsteady internal flow field simulations in a double suction centrifugal fan

Unsteady internal flow field simulations in a double suction centrifugal fan

The influence of the geometry of the leading edge of diffuser vanes on the noise generated by a centrifugal fan

The Effect of Half Vane Diffuser on the Noise Generated from a Centrifugal Fan

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