3D time accurate CFD simulations of a centrifugal compressor

Lucius, Andreas; Brenner, Günther

doi:10.1007/978-3-642-14438-7_18

Cited by 2 publications

(1 citation statement)

References 5 publications

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“…The decrease of endwall loss and blockage of the rotor induced by the potential effect increased the pressure rise by up to 5%. This is also consistent with the results of Lucius and Brenner [15] who showed that the steady-state assumption resulted in 10% lower performance prediction than the unsteady calculation. However, even when the net effects of the blade interaction are considered, more than 5% of the pressure rise difference is still unresolved.…”

Section: Calculation Models and Methodssupporting

confidence: 92%

Numerical Study on Unsteadiness of Tip Clearance Flow and Performance Prediction of Axial Compressor

Hwang

Kang

2011

ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D

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Numerical calculations were performed to investigate unsteady features of tip clearance leakage flow in an axial compressor. The first stage rotor of a low speed axial compressor with a large tip clearance was examined. It was confirmed that the numerically calculated performance data were in good agreement with the experimentally measured performance data. Using frequency analysis, the flow characteristic near the casing induced by tip clearance leakage flow was found to be not associated with the rotating speed of the rotor. This characteristic is called rotating instability or self-induced unsteadiness. We found that the circumferential length scale of the rotating instability of the compressor was longer than a pitch of a blade passage; therefore, a multi-blade passage was adopted to study the flow structure more precisely. The flow characteristic was described by the frequency, the circumferential length, and the phase velocity, and was changed by operating points toward stall. The behavior of the flow was characterized by circumferentially traveling waves. Hence, the mechanism governing the development of the unsteady feature was further examined in terms of the rotating wave pattern of the pressure distribution. Furthermore, the unsteady feature of the tip clearance leakage flow affected the prediction of compressor performance by altering blockage, flow turning, and loss near the casing.

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Section: Calculation Models and Methodssupporting

confidence: 92%

Numerical Study on Unsteadiness of Tip Clearance Flow and Performance Prediction of Axial Compressor

Hwang

Kang

2011

ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D

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Experimental Analysis of the Pressure Field Inside a Vaneless Diffuser From Rotating Stall Inception to Surge

Bianchini

Biliotti²,

Rubino³

et al. 2015

Journal of Turbomachinery

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An accurate estimation of rotating stall is one of the key points for high-pressure centrifugal compressors, as it is often connected with the onset of detrimental subsynchronous vibrations which can prevent the machine from operating beyond this limit. With particular reference to vaneless diffuser rotating stall, the most common practice in industrial machines is to make use of a limited number of dynamic pressure probes to reconstruct the stall characteristics after an ensemble averaging approach. In this study, a 1:1 model of an industrial compressor stage was tested in a dedicated test rig and equipped with 24 pressure probes properly distributed along the diffuser circumference with the scope of providing a real-time visualization of the spatial pressure distribution within the diffuser. The results allowed the assessment of some important characteristics of the stall cells that were historically supposed based on averaged data, e.g., the cells rigidity. Moreover, the present study confirmed the existence of a stall pattern with two almost axisymmetric lobes. Finally, the transient analysis of both the stall inception (SI) and the surge onset (SO) was carried out, highlighting the flow field evolution in the diffuser under these conditions

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3D time accurate CFD simulations of a centrifugal compressor

Cited by 2 publications

References 5 publications

Numerical Study on Unsteadiness of Tip Clearance Flow and Performance Prediction of Axial Compressor

Numerical Study on Unsteadiness of Tip Clearance Flow and Performance Prediction of Axial Compressor

Experimental Analysis of the Pressure Field Inside a Vaneless Diffuser From Rotating Stall Inception to Surge

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