Performance Improvement of Centrifugal Compressor Impellers by Optimizing Blade-Loading Distribution

Yagi, M.; Kishibe, Tadaharu; Shibata, Takanori; Nishida, Hideo; Kobayashi, Hiromi

doi:10.1115/gt2008-51025

Cited by 14 publications

(10 citation statements)

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“…Xu and Amano [4] designed a low flow coefficient high-pressure ratio single stage centrifugal compressor to meet the requirements on the efficiency and the stability range by using a viscous optimization process. Yagi et al [5] optimized the impeller's blade load distribution to improve the efficiency and operating range of LSCCC. Xi et al [6] compared two inverse design methods to the design for a low flow coefficient impeller and validated them by the stage performance test.…”

Section: Introductionmentioning

confidence: 99%

Influences of cavity leakage on the design of low flow coefficient centrifugal impeller

Wang

2011

Sci. China Technol. Sci.

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The low flow coefficient centrifugal impeller (LFCCI) gives a relatively low efficiency and a special treatment is required for the design of this kind of impeller. This paper investigates the influences of cavity leakage on the performance prediction and design of LFCCI based on Computational Fluid Dynamics (CFD) techniques. The results show that, the reduction in the efficiency of impeller due to the introduction of cavity leakage varies with the blade shape of impeller in a wide range since there is a strong and complex interaction of main flow and leakage flow in the LFCCI. To get a credible optimization result, the backside and foreside cavities should be considered in the CFD-based design of LFCCI. cavity leakage, optimization design, low flow coefficient, impeller Citation:Wang Z H, Xi G. Influences of cavity leakage on the design of low flow coefficient centrifugal impeller.

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Section: Introductionmentioning

confidence: 99%

Influences of cavity leakage on the design of low flow coefficient centrifugal impeller

Wang

2011

Sci. China Technol. Sci.

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“…The test apparatus was composed of a closed loop, and the working gas was circulated [8]. The total pressure and total temperature at the nozzle inlet were maintained at about 101.3 kPa and 293 K, respectively.…”

Section: Test Apparatusmentioning

confidence: 99%

Improving Flow Distribution in a Suction Channel for a Highly Efficient Centrifugal Compressor

Yagi

Shibata

Kobayashi

et al. 2012

International Journal of Fluid Machinery and Systems

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Design parameters for suction channels of process centrifugal compressors were investigated, and an optimization method to enhance stage efficiency by using the new design parameters was proposed. From results of computational fluid dynamics, the passage sectional area ratios A c /A e , A e /A s and A c /A s were found to be the dominant parameters for the pressure loss and circumferential flow distortion, where A c , A e and A s are passage sectional areas for the casing upstream side, casing entrance and impeller eye, respectively. The Base suction channel was optimized using the new design parameters, and the Base and Optimized types were tested. Test results showed that the Optimized suction channel achieved 3.8% higher stage efficiency than the Base suction channel while maintaining the same operating range.

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“…To improve the aerodynamic performance of the centrifugal compressor, many investigations on impellers and diffusers have been conducted [1][2][3][4][5]. Previous investigations suggested that higher efficiency can be achieved by improving the blade loading distribution of the impeller in the case of high and medium flow coefficients.…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement of a Return Channel in a Multistage Centrifugal Compressor Using Multiobjective Optimization

Nishida¹,

Kobayashi²,

Nishida

et al. 2013

Journal of Turbomachinery

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The effect of the design parameters of a return channel on the performance of a multistage centrifugal compressor was numerically investigated, and the shape of the return channel was optimized using a multiobjective optimization method based on a genetic algorithm to improve the performance of the centrifugal compressor. The results of sensitivity analysis using Latin hypercube sampling suggested that the inlet-to-outlet area ratio of the return vane affected the total pressure loss in the return channel, and that the inlet-to-outlet radius ratio of the return vane affected the outlet flow angle from the return vane. Moreover, this analysis suggested that the number of return vanes affected both the loss and the flow angle at the outlet. As a result of optimization, the number of return vane was increased from 14 to 22 and the area ratio was decreased from 0.71 to 0.66. The radius ratio was also decreased from 2.1 to 2.0. Performance tests on a centrifugal compressor with two return channels (the original design and optimized design) were carried out using two-stage test apparatus. The measured flow distribution exhibited a swirl flow in the center region and a reversed swirl flow near the hub and shroud sides. The exit flow of the optimized design was more uniform than that of the original design. For the optimized design, the overall two-stage efficiency and pressure coefficient were increased by 0.7% and 1.5%, respectively. Moreover, the second-stage efficiency and pressure coefficient were respectively increased by 1.0% and 3.2%. It is considered that the increase in the second-stage efficiency was caused by the increased uniformity of the flow, and the rise in the pressure coefficient was caused by a decrease in the residual swirl flow. It was thus concluded from the numerical and experimental results that the optimized return channel improved the performance of the multistage centrifugal compressor.

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Performance Improvement of Centrifugal Compressor Impellers by Optimizing Blade-Loading Distribution

Cited by 14 publications

References 0 publications

Influences of cavity leakage on the design of low flow coefficient centrifugal impeller

Influences of cavity leakage on the design of low flow coefficient centrifugal impeller

Improving Flow Distribution in a Suction Channel for a Highly Efficient Centrifugal Compressor

Performance Improvement of a Return Channel in a Multistage Centrifugal Compressor Using Multiobjective Optimization

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