Experimental and numerical investigation of the flow field in a high-pressure centrifugal compressor impeller near surge

Bulot, Nicolas; Trébinjac, Isabelle; Ottavy, Xavier; Kulisa, Pascale; Halter, G; Paoletti, Benoît; Krikorian, P

doi:10.1243/09576509jpe817

Cited by 14 publications

(8 citation statements)

References 15 publications

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“…2 shows a meridional view of the compressor stage and the section B where LDA measurements are shown. Information concerning the LDA measurement technique is given in a previous paper (Bulot et al [12]). The uncertainty of the geometric location of any LDA measurement point is estimated to be ±0.15 mm.…”

Section: Measurementsmentioning

confidence: 99%

Detailed analysis of the flow in the inducer of a transonic centrifugal compressor

Buffaz¹,

Trébinjac²

2012

J. Therm. Sci.

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Section: Measurementsmentioning

confidence: 99%

Detailed analysis of the flow in the inducer of a transonic centrifugal compressor

Buffaz¹,

Trébinjac²

2012

J. Therm. Sci.

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“…Figure 2 shows a meridional view of the compressor stage and the section 'E' where laser Doppler anemometry (LDA) measurements are shown in this article. Information concerning the LDA measurement technique is given in a previous paper [6]. The uncertainty of the geometric location of any LDA measurement point is estimated to be AE0.15 mm.…”

Section: Test Casementioning

confidence: 99%

“…This study is a part of a larger work which aims at understanding the flow phenomena responsible for surge inception. In a previous paper, the impeller internal flow was described with a steady point of view [6]. In this article, the flow evolution from choke to surge is given in the entire compressor from unsteady data obtained at various stable operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the flow in a transonic centrifugal compressor stage from choke to surge

Trébinjac

Bulot²,

Buffaz

2011

Proceedings of the Institution of Mechanical Engineers, Part A:

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Numerical and experimental investigations were conducted in a transonic centrifugal compressor stage composed of a backswept splittered unshrouded impeller and a vaned diffuser. Unsteady three-dimensional simulations were performed with the code elsA that solves the turbulent-averaged Navier–Stokes equations, at three operating points: choked flow, peak efficiency, and near surge. Numerical results were validated with experimental data coming from laser Doppler anemometry and unsteady pressure measurements. This article focuses on the change in flow structures when the operating point moves from choke to surge. The main changes in the impeller consist in an enlargement of the wake (of the jet-wake flow structure) and an increase in the exit time-averaged flow angle. Consequently, in the diffuser passage, the main flow trajectory moves towards the vane pressure side, and the boundary layer separation transfers from pressure side to suction side. The interaction between the vane bow shock wave and the impeller blade leads to pressure waves α+, which propagate in the diffuser passage. These pressure waves generate alternately opposite and favourable pressure gradients, which drive the boundary layers to periodic separation. From choke to surge, the intensity of the pressure waves α+ increases. The interaction also leads to subsonic pockets Г, which are torn out from the vane-leading edge bow shock and swept along the vane suction side. The induced change in the shock shape and location combined with the severe hub/suction side corner separation are thought to be at the origin of the surge inception.

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“…5 To minimize the interaction effect, investigations are conducted to find the optimum value of radial gap between impeller and vaned diffuser. 6…”

Section: Introductionmentioning

confidence: 99%

Dynamic mode decomposition analysis of the flow characteristics in a centrifugal compressor with vaned diffuser

Zhao

Liu

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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To understand the flow dynamic characteristics of a centrifugal compressor, the dynamic mode decomposition (DMD) method is introduced to decompose the complex three-dimensional flow field. Three operating conditions, peak efficiency (OP1), peak pressure ratio (OP2), and small mass flow rate (near stall, OP3) conditions, are analyzed. First, the physical interpretations of main dynamic modes at OP1 are identified. As a result, the dynamic structures captured by DMD method are closely associated with the flow characteristics. In detail, the BPF/2BPF (blade passing frequency) corresponds to the impeller–diffuser interaction, the rotor frequency (RF) represents the tip leakage flow (TLF) from leading edge, and the 4RF is related to the interaction among the downstream TLF, the secondary flow, and the wake vortex. Then, the evolution of the dynamic structures is discussed when the compressor mass flow rate consistently declines. In the impeller, the tip leakage vortex near leading edge gradually breaks down due to the high backpressure, resulting in multi-frequency vortices. The broken vortices further propagate downstream along streamwise direction and then interact with the flow structures of 4RF. As a result, the 8RF mode can be observed in the whole impeller, this mode is transformed from upstream RF and 4RF modes, respectively. On the other hand, the broken vortices show broadband peak spectrum, which is correlated to the stall inception. Therefore, the sudden boost of energy ratio of 14RF mode could be regarded as a type of earlier signal for compressor instability. In the diffuser, the flow structures are affected by the perturbation from the impeller. However, the flow in diffuser is more stable than that in impeller at OP1–OP3, since the leading modes are stable patterns of BPF/2BPF.

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Experimental and numerical investigation of the flow field in a high-pressure centrifugal compressor impeller near surge

Cited by 14 publications

References 15 publications

Detailed analysis of the flow in the inducer of a transonic centrifugal compressor

Detailed analysis of the flow in the inducer of a transonic centrifugal compressor

Analysis of the flow in a transonic centrifugal compressor stage from choke to surge

Dynamic mode decomposition analysis of the flow characteristics in a centrifugal compressor with vaned diffuser

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