Design and Analysis of a Split Deswirl Vane in a Two-Stage Refrigeration Centrifugal Compressor

Huang, Jeng-Min; Tsai, Yue-Hann

doi:10.1155/2014/130925

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…Palmer [45] found that reduced first-stage diffusion could improve the surge range over 80% rotational speeds, but the improvement was limited with inducer shroud bleed. It has been observed that, at low mass flow rates, the de-swirler vane influences the upstream flow structure of the vaneless diffuser and return channel [46]. Hung [47] suggested that, in the case of a vaned diffuser, the vane angle must be increased to reduce the surge mass flow rate.…”

Section: Two Stagementioning

confidence: 99%

Instability Phenomena in Centrifugal Compressors and Strategies to Extend the Operating Range: A Review

Cravero,

Marsano

2024

Energies

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Centrifugal compressors are widely used in different fields. Their design requires high performance and a wide operating range, where, at lower mass flow rates, unstable flow dynamic phenomena occur, which are extremely harmful and, at the same time, complex to fully understand. This review paper presents the main research from the last 40 years on the subject of instability in centrifugal compressors, aiming to clarify the main (sometimes contradictory) causes, classifying them according to the component in which they are triggered or the interaction between them. Importance is given to works that develop criteria for the identification of the stability limit with simplified models. The main techniques used to extend the stability limit are also presented by distinguishing between passive and active fixed-flow control methods; moreover, the main works on variable geometry techniques are reported, showing the advantages and disadvantages of their use. Finally, an overview of the innovative applications of centrifugal compressors, such as fuel cells, is presented. The aim of this review is to highlight the continued interest in this field of study and provide the tools to understand the different unstable mechanisms and techniques used to extend the operating limit.

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Section: Two Stagementioning

confidence: 99%

Instability Phenomena in Centrifugal Compressors and Strategies to Extend the Operating Range: A Review

Cravero,

Marsano

2024

Energies

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“…Compared to axial inlet, the radial IC will introduce extra flow loss and distortion at the impeller inlet, which will negatively affect the performance of the compressor. 8,9 However, due to the nonaxisymmetric geometry of radial IC, a complex threedimensional internal flow is formed, making the flow measurements more difficult and time-consuming; while without detailed experimental data, the reliability of numerical simulations on such a complex geometry cannot be guaranteed. 10 Since the 1990s, benefiting from the development of aerodynamic probes and numerical methods, 11 the cost of experimental and numerical research on the flow field inside complex geometries have been greatly reduced, which promoted a thorough analysis of radial IC.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and numerical studies on the influence of inlet guide vanes of centrifugal compressor on the flow field characteristics of inlet chamber

Han

Wang

Mao

et al. 2014

Advances in Mechanical Engineering

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Inlet chambers (IC) are the typical upstream component of centrifugal compressors, and inlet guide vanes in the IC have a great impact on its internal flow and aerodynamic loss, which will significantly influence the performance of the downstream compressor stages. In this paper, an experimental study was carried out on the flow characteristics inside a radial IC of an industrial centrifugal compressor, including five testing sections and 968 measuring points for two schemes with and without guide vanes. Detailed distributions of flow parameters on each section were obtained as well as the overall performance of the radial IC, and the causes of the flow loss inside the IC and the non-uniformity of flow parameters at the outlet section were investigated. Besides, numerical simulations were performed to further analyze the flow characteristics inside the radial IC. The experimental and numerical results indicate that, in the scheme without guide vanes, sudden expansions in the spiral channel and flow separations in the annular convergence channel are the major sources of flow loss and distortions generated in the radial IC; while in the scheme with guide vanes, the flow impacts, separations and wakes caused by the inappropriate design of guide vanes are the main reasons for the flow loss of the IC itself and the uneven flow distributions at the IC outlet.

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Numerical Investigations of Near Surge Operating Conditions in a Two-Stage Radial Compressor With Refrigerant Gas

Cravero,

Marsano,

Sishtla

et al. 2023

Journal of Engineering for Gas Turbines and Power

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Modern compressor design targets require high performance and a wide operating range in order to reduce the environmental impact. To understand the fluid dynamics mechanisms that trigger instability, studying the system at the stability limit is required. In this work, a two-stage back-to-back centrifugal compressor for refrigerant applications has been simulated with CFD techniques using unsteady calculations in different operating points close to surge. These models have been validated by comparing numerical performance with experimental data. An in-depth fluid dynamics analysis combined with the monitoring of several pressure signals, post-processed with FFT, identified different flow phenomena in the two stages towards the surge limit. The key role of the volute that induces a stronger upstream counter-pressure in the first stage has been highlighted. This effect causes the formation of high entropy (low momentum) rotating cells in the diffuser that involve a higher channel portion with respect to the flow structure in the second diffuser. This phenomenon affects the upstream flow conditions at the impeller. In addition, the interaction between the IGV and the inducer has been analysed, observing that in the second stage, due to the flow non-uniformity after the ICP, non-negligible separations occur. Starting from the peaks detected in the FFT analysis of the pressure signals all the above flow mechanisms have been detected and discussed.

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Design and Analysis of a Split Deswirl Vane in a Two-Stage Refrigeration Centrifugal Compressor

Cited by 5 publications

References 3 publications

Instability Phenomena in Centrifugal Compressors and Strategies to Extend the Operating Range: A Review

Instability Phenomena in Centrifugal Compressors and Strategies to Extend the Operating Range: A Review

Experimental and numerical studies on the influence of inlet guide vanes of centrifugal compressor on the flow field characteristics of inlet chamber

Numerical Investigations of Near Surge Operating Conditions in a Two-Stage Radial Compressor With Refrigerant Gas

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