Effects of tapered diffuser vane on the flow field and noise of a centrifugal compressor

Ohta, Yutaka; Goto, Takashi; Outa, Eisuke

doi:10.1007/s11630-007-0301-1

Cited by 15 publications

(11 citation statements)

References 11 publications

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“…The inlet and outlet diameters of the impeller are 248 mm and 328 mm, respectively. Please refer to our previous papers for details of the tested compressor [5] .…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Noise reduction and surge margin improvement using tapered diffuser vane in a centrifugal compressor

et al. 2010

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Improvement of surge margin and reduction of interaction tone noise radiated from a centrifugal compressor with a vaned diffuser is discussed from experiments and CFD analyses. Two types of one-side tapered diffuser vanes, which are shroud-and hub-side tapered vanes, were used in the experiments. The height of the leading edge of the tapered vanes varied from 100% to 10%. Both types of tapered vanes are effective for the reduction of the interaction tone noise radiated from the compressor, because of the smaller interaction area between impeller-discharge flow and diffuser vane surface. Especially, the hub-side tapered diffuser vane suppresses the evolution of the leading-edge vortex, which causes reverse-flow in the diffuser passage. Furthermore, the hub-side tapered diffuser vane, which has an optimized diffuser leading edge shape, can improve the compressor pressure-rise characteristics at low-flow operation and can enlarge the surge margin.

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“…The inlet and outlet diameters of the impeller are 248 mm and 328 mm, respectively. Please refer to our previous papers for details of the tested compressor [5] .…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

Noise reduction and surge margin improvement using tapered diffuser vane in a centrifugal compressor

et al. 2010

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“…Meanwhile, the ILEVD extends the operating range. The work by Ohta et al [10] showed that the tapered diffuser vane could remarkably reduce the compressor noise, whereas it diminished the pressure rise and working range.…”

Section: Influence Of Vaned Diffuser With Broken Leading Edgementioning

confidence: 99%

“…In the previous studies of the centrifugal compressor stage, some researchers [6,7] considered that the optimal impeller-diffuser radial gap existed, and they advised that the optimal value of diffuser leading edge radius, R 3 /R 2 , was from 1.06 to 1. 10. The impeller-diffuser radial gap of the vacuum fan is very small, which leads to the strong interaction between the flow discharged from the impeller exit and the diffuser.…”

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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“…Ohta et al. 6,7 designed three types of tapered diffusers with different tapered portion lengths on the pressure and suction surfaces. All three types of tapered diffusers were effective in reducing the noise level, and the application of diffuser type C (i.e.…”

Section: Introductionmentioning

confidence: 99%

Parametric study of slotted diffuser effects on a highly loaded centrifugal compressor

Zhang

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Flow separations in the vaned diffuser play a critical role in the stall margin of centrifugal compressors. To extend the stable operating range of a highly loaded centrifugal compressor, a flow control technique of locating a slot near the vaned diffuser's leading edge is proposed. A parametric study of slot geometry variations, in terms of the slotted portion depth and length, is carried out to summarize the trend of compressor performance and to reveal the corresponding flow physics related to the slot geometries. The design methodology is concluded to provide a guideline for stall margin improvement by the slotted diffuser. Application of a well-designed slotted diffuser shows that the flow separations inside the diffuser passages are suppressed at low flow rates, and the stall margin is increased without performance deterioration. The leakage flow passing through the slotted portion intensifies the passage vortex at the hub/suction surface corner, and decreases the flow angle at the diffuser inlet, leading to the suppression of flow separations on both the suction and pressure surfaces of the diffuser, respectively. However, it is found that the compressor performance deteriorates with increasing slotted portion depth and length, even though the stall margin is increased. When the slot depth is increased by up to 12% of the diffuser vane height, the leakage flow is not able to roll-up into a vortex that has the potential to mitigate the flow separation at the hub/suction surface corner. Instead, it enhances the flow separation region near the suction surface due to the negative effect of leakage flow; eventually, the stage performance is deteriorated. In conclusion, the slot depth should not exceed 9% of the diffuser vane height, and the optimum slot length is no greater than 6%–12% of the diffuser chord length, which provides a basic guideline for slotted diffuser design.

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Effects of tapered diffuser vane on the flow field and noise of a centrifugal compressor

Cited by 15 publications

References 11 publications

Noise reduction and surge margin improvement using tapered diffuser vane in a centrifugal compressor

Noise reduction and surge margin improvement using tapered diffuser vane in a centrifugal compressor

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

Parametric study of slotted diffuser effects on a highly loaded centrifugal compressor

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