Effect of diffuser vane height and position on the performance of a centrifugal compressor

Issac, J. M.; Sitaram, N.; Govardhan, M.

doi:10.1243/0957650042584320

Cited by 22 publications

(18 citation statements)

References 2 publications

(3 reference statements)

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“…In Refs. 8 and 10 , the optimal heights of the half vanes for the stage performance are 0.4 and 0.3 times the diffuser width, respectively. For the present fan, the optimal vane height is about 0.6 times the diffuser width.…”

Section: Resultsmentioning

confidence: 99%

“…During the past years, some investigations have been carried out to study the half vane diffuser in centrifugal compressors. The results showed that this diffuser could improve the stage performance 8–10 . Yoshinaga et al 8 proposed a diffuser with half vanes in a centrifugal compressor and the test result showed that the pressure recovery of this diffuser at distorted inlet flow is considerably improved.…”

Section: Introductionmentioning

confidence: 95%

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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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show abstract

“…A numerical simulation of the compressor with eight kinds of non-dimensional hub vane height h/b was conducted to study the influence of the diffuser hub vane height on the flow characteristics. Issac et al 9 experimentally studied the effect of diffuser vane height that varied from 0.2 to 0.9 times the diffuser width and vane position by fixing the partial vanes to the hub, shroud, or hub and shroud on the performance of a low-speed centrifugal compressor. It was found that there was an optimum height of 0.3 times the diffuser width for the diffuser vane height.…”

Section: Introductionmentioning

confidence: 99%

Study of the flow characteristics in multi-row vaned diffusers of a centrifugal compressor stage

Zhao

2018

Advances in Mechanical Engineering

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The vaned diffuser has a significant impact on the performance and operating range of a centrifugal compressor stage, and multi-row vaned diffusers are applied to improve the compressor characteristics in this article. In order to validate the effectiveness of the present calculation method, the calculation results of the centrifugal compressor with the conventional diffuser have been verified by the experimental data. The simulation results reveal that, compared with the original model at design point, the isentropic efficiency increases by 2.8% and 4.1%, and the total pressure ratio increases by 1.9% and 3.4%, for the compressor stage with the two-row vaned diffuser and the three-row vaned diffuser, respectively. The models with multi-row vaned diffusers also give higher static pressure recovery coefficient and lower total pressure loss coefficient. A pressure gradient formed on vane suction surface near vane leading edge develops the flow separation in the conventional diffuser. The pressure gradient thus causes the secondary flow from hub to shroud on vane suction surface, aggravating the separation in the rear part of the conventional diffuser. The analysis of flow characteristics in diffuser passages also shows that using multi-row vaned diffusers can alleviate flow separation appearing in the diffuser passages.

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“…In their approach, the dynamics of the compression system were modified by feeding back perturbations into the flow field. Issac et al [6] experimentally investigated the effect of diffuser vane position and height on the low-speed compressor pressure coefficient. Several numerical and experimental studies have been performed for overhung volutes with an elliptical, rectangular, or circular cross-section [6].…”

Section: Introductionmentioning

confidence: 99%

“…Issac et al [6] experimentally investigated the effect of diffuser vane position and height on the low-speed compressor pressure coefficient. Several numerical and experimental studies have been performed for overhung volutes with an elliptical, rectangular, or circular cross-section [6]. Ayder et al [7] performed numerical and experimental studies based on an elliptical overhung volute using a multi-hole probe to measure flow parameters at several angular locations along the circumferential of the volute scroll.…”

Section: Introductionmentioning

confidence: 99%

Influence of the volute design parameters on the performance of a centrifugal compressor of an aircraft turbocharger

Hassan

2007

Proceedings of the Institution of Mechanical Engineers, Part A:

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Theoretical and experimental studies on the effect of the volute design parameters on the centrifugal compressor range of stable operation and pressure rise coefficient were investigated. In the theoretical study, the effect of the symmetric and tangent volute area ratios (AR) on the diffuser pressure recovery factor and flow stability was investigated. In the experimental study, different configurations of a symmetrical and tangent (overhung) volutes with different ARs from 0.4 to 0.8 were investigated. Comparisons between the two different types of volute design parameters on compressor stable flow range and pressure rise coefficient were made. Effect of the gab between the diffuser vanes and the volute casing on the compressor stability was investigated. This gap was changed from 0 to 0.4 of the impeller exit width in five tests. The pressure fluctuation leading to stall was observed at the vaneless region. Stall and surge were detected by analysing both the fluctuations of pressure signals and the power spectrum density. The effect of different volute configurations and clearance on stall initiation, and hence compressor stable operation, were discussed. The theoretical results show that the increase in the symmetric volute exit radius increases the pressure recovery factor in the diffuser. Experimental data show that the increase in the AR of symmetric and tangent volutes increases the compressor range of stable operation as well as pressure rise coefficient.

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Effect of diffuser vane height and position on the performance of a centrifugal compressor

Cited by 22 publications

References 2 publications

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

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

Study of the flow characteristics in multi-row vaned diffusers of a centrifugal compressor stage

Influence of the volute design parameters on the performance of a centrifugal compressor of an aircraft turbocharger

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