A Review of Rotating Stall in Vaneless Diffuser of Centrifugal Compressor

Zhang, Lei; He, Ruiyang; Wang, Songling; Zhang, Qian

doi:10.1007/s11630-020-1261-y

Cited by 33 publications

(10 citation statements)

References 64 publications

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“…In China, when the GTDS operating pressure is too high, that is, when P mpn and P co exceed P mpn,max and P co,max , companies usually use the MPRS to quickly release the medium-pressure and high-pressure gas in the pipeline. In addition, the compression equipment in the GTDS is usually centrifugal compressors (CCs), which can reduce the amount of air processed by the compressor by adjusting the inlet guide vanes of the CC . This adjustment scheme is called the compressor IGVOA, which is currently only used in CCs .…”

Section: Model and Methodsmentioning

confidence: 99%

Energy Saving Benefit Analysis of the Compressor Short-Stop Adjustment Method Based on TGNET

et al. 2021

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Aiming at the problem of gas emissions caused by the high-pressure operation of a large industrial gas (O2, N2, and Ar) pipeline network, this study establishes a mathematical model of the oxygen transmission and distribution system (OTDS) based on TGNET software. In addition, the study conducts transient simulation, comprehensively considering theoretical constraints and actual operation requirements, and adopts a large air separation company for the OTDS as a case study. After comparing two traditional adjustment methods, a compressor short stop adjustment strategy is proposed to reduce the peak pressure of the pipe network system. This study determines the energy-saving benefits and the difference in the scope of application of compressor short-stop adjustment. Compared with the medium-pressure release and inlet guide vane opening adjustment (IGVOA) strategies, the compressor short-stop adjustment strategy reduced oxygen emission by 3850.9 Nm3 and increased by 927.1 Nm3. Furthermore, the compressor operating energy consumption was reduced by 3349 and 2919 kW h. Compared with the IGVOA strategy, the compressor short-stop adjustment strategy has increased the application range of compressor inlet pressure and medium-pressure pipeline pressure by more than 70%. This strategy is effective for reducing the emission of pipeline gases caused by fluctuations in user demand.

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Section: Model and Methodsmentioning

confidence: 99%

Energy Saving Benefit Analysis of the Compressor Short-Stop Adjustment Method Based on TGNET

et al. 2021

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“…Since the irreversibility of the internal flow in the pump must cause the production of entropy, the entropy production theory was used to establish the relationship between the energy loss of hydraulic components and the change of entropy in this paper [14][15]. The temperature change inside the pump was ignored, and the entropy production rate Ф studied in this paper was composed of two parts which defined by equation (2)(3)(4).…”

Section: Entropy Production Analysismentioning

confidence: 99%

“…Regarding the research on the stall characteristics of fluid machinery, Zhang et al [3]. reviewed the study of stall characteristics in the vaneless diffuser of centrifugal compressors.…”

Section: Introductionmentioning

confidence: 99%

Optimization design and unsteady flow analysis of stall characteristics in a vertical centrifugal pump

Yang

Zhao

Stankovic

et al. 2022

J. Phys.: Conf. Ser.

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In this paper, an optimization design of the vertical centrifugal pump with vaned diffuser was accomplished, and analyzed the internal flow pattern of the model before and after optimization under stall conditions to explore the relationship between design parameters and the stall characteristics. The reasons for the improvement of efficiency and hump characteristics curve after optimization were revealed combined with streamline distributions, entropy production theory and pressure fluctuation. The results show that the error between the external characteristic result calculated by Computational Fluid Dynamics (CFD) and the experimental value is less than 5%, which proves the reliability of the numerical simulation method adopted in this paper. The hydraulic efficiency under multiple operating conditions and stall characteristics of the optimized model have been significantly improved. After optimization, the entropy production rate in the vaned diffuser is greatly reduced, and the improvement of the internal flow pattern in the vaned diffuser is the main reason for slowing down the hump characteristic curve. The hydraulic performance and the stall characteristics of the vertical centrifugal pump can be significantly improved by properly increasing the radial distance of the vaneless region. The matching relationship between the vaned diffuser and the impeller is one of the important factors that affect the stall characteristics. The large-scale vortices in the vaned diffuser is the main reason for the low-frequency pressure fluctuation signal when operating in the hump region. The low-frequency signal in the vaned diffuser of the optimized model is obviously weakened.

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“…At present, the research on the centrifugal compressor impeller has been perfected, so efforts should be made to improve the performance of the centrifugal compressor from the perspective of optimizing the diffuser [9]. Vaneless diffusers [10,11] can be divided into parallel wall-types, convergent types and expansion types according to the different ratios of the diffuser outlet width to the impeller outlet width. Due to the large internal cross section of the expansion type vaneless diffuser, a large reversed pressure gradient can be generated, and secondary flows and backflows are easily generated during the flow process, so the expansion type vaneless diffuser is rarely used in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Vaneless Diffuser Shape on Performance of Centrifugal Compressor

et al. 2020

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The influence of four different vaneless diffuser shapes on the performance of centrifugal compressors is numerically studied in this paper. One of the studied shapes was a parallel wall diffuser. Two others had the width reduced only from hub and shroud and the rest had the width reduced from hub and shroud divided evenly. Then the numerical simulation was employed and the overall compressor aerodynamic performance was studied. The detailed velocity and pressure distribution and energy loss within the centrifugal compressor with different diffuser geometries and different operating conditions were analyzed. The results revealed that shroud pinch significantly improved the overall compressor aerodynamic performance more than any other pinch types, and the best performance can be achieved by pinched diffusers under the design condition compared with pinched diffusers under the near surge condition or choking condition. The range of energy loss, namely the static entropy area in the compressor, become reduced with the above three pinches diffusers.

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A Review of Rotating Stall in Vaneless Diffuser of Centrifugal Compressor

Cited by 33 publications

References 64 publications

Energy Saving Benefit Analysis of the Compressor Short-Stop Adjustment Method Based on TGNET

Energy Saving Benefit Analysis of the Compressor Short-Stop Adjustment Method Based on TGNET

Optimization design and unsteady flow analysis of stall characteristics in a vertical centrifugal pump

Effect of Vaneless Diffuser Shape on Performance of Centrifugal Compressor

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