Stall margin improvement of a centrifugal compressor utilizing various stepped tip gap configurations

Taghavi-Zenouz, Reza; Solki, Ehsan; Afshari, Hadi

doi:10.1177/0957650914540153

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…Taghavi-Zenouz et al. 1 researched various casing treatment configurations of the stepped tip-gap type and found them to be an effective method for improving the compressor stall margin. Li et al.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, some interesting phenomena had been found in the study of compressor TLF characteristics. Taghavi-Zenouz et al 1 researched various casing treatment configurations of the stepped tipgap type and found them to be an effective method for improving the compressor stall margin. Li et al 2 studied the effect of chordwise nonuniform tip clearance on axial-compressor performance and found that by reducing the leading edge (LE) clearance size and increasing the trailing edge (TE) clearance size, the flow rate of a compressor was increased and the flow separation was delayed near the TE of the blade suction surface (SS).…”

Section: Introductionmentioning

confidence: 99%

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Effect of circumferential static pressure nonuniformity caused by volute on tip leakage flow in a centrifugal compressor

Yang

Bao

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part G:

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For a centrifugal compressor with volute, the flow field is circumferentially nonuniform because of the volute asymmetrical structure and leads to a circumferential difference in the tip leakage flow. In this work, the compressor performance and the casing wall static pressure distribution are measured, and the results are compared with the time-averaged results of the unsteady calculation to verify the reliability of the simulation. The results show a relationship between the tip leakage vortex trajectory and the high static pressure region in the diffuser, based on which a prediction model is established for the reverse propagation of pressure waves caused by a volute tongue. Influenced by the volute asymmetric structure, the trajectory, shape, and strength of the tip leakage vortex at different circumferential positions differs significantly. The tip leakage vortex trajectory affected by the high static pressure is more inclined to a circumferential direction because the tip leakage flow velocity flowing out of the suction surface is reduced, and the tip leakage flow with low velocity is subjected to the high-pressure gradient in a passage. Moreover, the tip leakage vortex breakdown in different passages differs significantly. A tip leakage vortex core more inclined towards the streamwise direction is more likely to break down than a tip leakage vortex core inclined towards the circumferential direction because of the larger reverse pressure gradient.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of circumferential static pressure nonuniformity caused by volute on tip leakage flow in a centrifugal compressor

Yang

Bao

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

show abstract

“…They found that, for same amount of flow coefficient, by shifting the shroud contour in the axial direction, head In the meridional direction of the passage, trimming is restricted by choking and hence a reduction up to 15% in head coefficient was achieved. Aerodynamic performance of a centrifugal compressor was investigated under various casing treatment configurations of stepped tip gap type numerically by Reza TaghaviZenouz [7]. This technique was introduced for the improvement of stall margin and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Influence of Number of Impeller and Diffuser Blades on the Pressure Recovery of Centrifugal Fan

Madhwesh¹,

Manjunath²,

Karanth³

2015

IJRET

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Experimental and Numerical Investigations of Surge Extension on a Centrifugal Compressor with Vaned Diffuser Using Steam Injection

Gao¹,

Huang²,

Zheng³

et al. 2017

International Journal of Rotating Machinery

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This paper presents the first report on surge extension with steam injection through both experimental and numerical simulation. The experimental section covers the test facility, instrumentation, and prestall modes comparison with and without steam injection. It is found that surge extension is not in proportion to injected steam. There exists an upper bound above which deteriorates the margin. Injection of less than 1% of the designed mass flow can bring about over 10% margin improvement. Test results also indicated that steam injection not only damps out prestall waves, but also changes prestall modes and traveling direction. At 90% speed, injection changed the prestall mode from spike to modal, while at 80% speed line, it made the forward traveling wave become backward. Through numerical simulation, location and number of injectors, molecular weight, and temperature of injected gas are modified to explore their influences on surge margin. Similar to the test results, there exists an upper bound for the amount of steam injected. The flow field investigation indicates that this bound is caused by the early trigger of flow collapse due to the injected steam which is similar to the tip leakage flow spillage caused spike stall in axial compressors.

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Stall margin improvement of a centrifugal compressor utilizing various stepped tip gap configurations

Cited by 3 publications

References 13 publications

Effect of circumferential static pressure nonuniformity caused by volute on tip leakage flow in a centrifugal compressor

Effect of circumferential static pressure nonuniformity caused by volute on tip leakage flow in a centrifugal compressor

Influence of Number of Impeller and Diffuser Blades on the Pressure Recovery of Centrifugal Fan

Experimental and Numerical Investigations of Surge Extension on a Centrifugal Compressor with Vaned Diffuser Using Steam Injection

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