Impeller-Diffuser Interaction in Centrifugal Compressors

Robinson, Chris; Casey, Michael; Hutchinson, Brad; Steed, Robin

doi:10.1115/gt2012-69151

Cited by 26 publications

(12 citation statements)

References 16 publications

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“…Optimal radial clearance exists for specific working conditions (Krishnababu, Imregun, Green, & Hoyniak, 2010;Anish & Sitaram, 2009). Robinson, Casey, Hutchinson, and Steed (2012) reported that decreasing the radial clearance ratio substantially increased efficiency. However, when the diffuser was closer to the impeller than the optimum value, the impeller likely experienced mechanical excitation.…”

Section: Introductionmentioning

confidence: 99%

Influence of rotor–stator component partition structure on the aerodynamic performance of centrifugal compressors

Shi³

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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The partition structure (PS) between the impeller and stationary blade of a centrifugal compressor considerably influences a compressor's performance. Based on computational fluid dynamics, this study constructed a coupling calculation model for the main flow, wheel cover, wheel disk side partition clearance, and sealing structure. Furthermore, we examined the influence that different PS shapes (i.e. circular arc, trapezoidal, and rectangular) and radial clearances (2, 4, and 6 mm) at the entrance of the cavity between the rotor and stator components have on the aerodynamic performance and loss mechanism of the centrifugal compressor using a numerical method. The influence that the PS has on the transition zone between the impeller outlet and stator inlet sections was analysed in detail. According to the results, when the PS was in a circular arc form, with a clearance of 2 mm, it achieved the highest efficiency, which increased the efficiency of the original model by 0.99% and the total pressure ratio by 1.23%. Moreover, an examination of the main flow interaction provided an enhanced insight into the microflow phenomenon in centrifugal compressors. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Influence of rotor–stator component partition structure on the aerodynamic performance of centrifugal compressors

Shi³

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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“…The excitation from the impeller-diffuser interaction is the main excitation acting on the impeller. Because the impeller-diffuser radial gap is becoming smaller by design [13,14], the interaction is getting more intense and the resulting unsteady aerodynamic loads are bigger. Moreover, the five-axis machine is now a common tool for impeller machining and the impeller is machined as one piece with very low structural damping [15,16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Influence of Splitter Blades on the Resonance Conditions of Impellers

Liu

Cheng

2019

Applied Sciences

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The conventional resonance conditions are derived based on the conventionally designed impellers without splitter blades. This paper proposes the resonance conditions for impellers under the excitation from the impeller–diffuser interaction with attention paid on the influence of splitter blades. A lumped parameter model is established and the modal analysis is carried out. The blade-based representative modal vector (RMV) is defined. The influence of splitter blades on the impeller’s traits of modes is investigated by analyzing the spatial harmonic contents of the RMV. Then, given the specific form of the diffuser-induced engine order excitation acting on the main and splitter blades, the resonance conditions are derived. Tuned and mistuned cases are provided for a practical impeller. The resonance conditions are verified by harmonic response calculations. The applications of the proposed resonance conditions in resonance identification and hazard evaluation of different excitations are given. The differences between the proposed resonance conditions and the conventional ones are discussed. The research indicates that even the RMV of the tuned impeller contains two harmonic components due to the existence of splitter blades. When the excitation frequency equals the natural frequency of the impeller and the excitation order matches with either harmonic index of the two harmonics, the resonance occurs. The results of case studies show that the harmfulness of various engine orders of excitation can be exactly evaluated by the joint use of the spatial harmonic contents analysis result and the proposed resonance conditions; however, analyzing based on the conventional resonance conditions may lead to the misjudgment of the harmfulness of the excitations.

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“…Gallier [11] studied excitation mechanisms for impeller-diffuser interaction in a centrifugal compressor. Robinson et al [12] reported the occurrence of mechanical excitation with the impeller when this component was too close to the diffuser.…”

Section: Introductionmentioning

confidence: 99%

Loss Mechanism of Static Interstage Components of Multistage Centrifugal Compressors for Integrated Blade Design

Fang

et al. 2018

Mathematical Problems in Engineering

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Although centrifugal compressors are widely used in construction, they consume a large amount of energy; in existing multistage centrifugal compressors, there is a serious pressure loss of ~15.13% when gas flows through the diffuser, bend, and return channel. In this study, we analyze the loss mechanisms of these stages in detail, using computational fluid dynamics. Based on this analysis, we present a new type of integrated blade, connecting the diffuser, bend, and return channels, which can eliminate the airflow stall phenomenon. Through effective control of the airflow spreading process, we minimized losses in the component, which improved its efficiency by 4.39% and increased the pressure ratio by 2.86% relative to a compressor without the newly-designed integrated blade. The concepts used in the creation of this component can provide a reference for the future design of blades for flow through parts of multistage compressors.

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Impeller-Diffuser Interaction in Centrifugal Compressors

Cited by 26 publications

References 16 publications

Influence of rotor–stator component partition structure on the aerodynamic performance of centrifugal compressors

Influence of rotor–stator component partition structure on the aerodynamic performance of centrifugal compressors

Investigation of the Influence of Splitter Blades on the Resonance Conditions of Impellers

Loss Mechanism of Static Interstage Components of Multistage Centrifugal Compressors for Integrated Blade Design

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