Self-Recirculating Casing Treatment Concept for Enhanced Compressor Performance

Hathaway, Michael D.

doi:10.1115/gt2002-30368

Cited by 76 publications

(50 citation statements)

References 13 publications

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“…Casing treatment is a method that significantly improves the performance of a compressor/fan, and it has been developed into many forms since Koch C C [5][6][7][8][9] found that it can improve the compressor stability margin. The traditional casing treatment includes axial slots, circumferential grooves, and chordwise grooves [10][11][12][13][14][15][16]. Greitzer [10] concluded that the traditional casing treatment can extend the stall margin at the expense of efficiency loss.…”

Section: Introductionmentioning

confidence: 99%

“…Considering both the efficiency and the stall margin, Hathaway [16] proposed a self-recirculating casing treatment that, unlike the conventional casing treatment, has an external airflow path isolated from the compressor main flow. The downstream high pressure is sucked by the slot and then driven by the differential pressure before being ejected from the leading edge of the blade through the external airflow channel.…”

Section: Introductionmentioning

confidence: 99%

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An Investigation of the Mechanisms of Stall Margin Improvement in Casing Treatment with Bridge Structure

Huang¹,

Yuan²,

Han³

2016

Proceedings of the 2016 International Conference on Artificial Intelligence and Engineering Applications

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Abstract. In this paper, casing treatment with a bridge structure is numerically investigated to study the mechanism of stall margin improvement. The results show that both the tip leakage flow and separation flow on the suction side of the blade can block the rotor tip passage and thereby lead to stall. Tip leakage flow is the main reason for stall in a compressor with a smooth shroud. Bridge casing treatment can control both the tip leakage flow and separation flow to balance stall margin improvement and efficiency loss by varying the suction area and the jet area. The results show that the enlargement of the jet area increases the attack angle; consequently, the separation flow increases on the suction side whereas the efficiency decreases. Moreover, it is observed that tip leakage decreases and stall margin increases with an increase in the jet suction area.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Investigation of the Mechanisms of Stall Margin Improvement in Casing Treatment with Bridge Structure

Huang¹,

Yuan²,

Han³

2016

Proceedings of the 2016 International Conference on Artificial Intelligence and Engineering Applications

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“…In their experiments, they found that simpler casing treatments, without bleed flow, might provide appreciable improvements in the stall range. Many researchers have been studying the casing treatment on the axial compressor since early 1970s [4][5][6][7][8]. Later on the application to centrifugal compressors was carried out [9,10].…”

Section: Introductionmentioning

confidence: 99%

Performance of a centrifugal compressor with holed casing treatment in the large flowrate condition

Wang

2011

Sci. China Technol. Sci.

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As demonstrated by former work, the holed casing treatment can be used to expand the stall margin of a centrifugal compressor with unshrouded impeller. In addition, the choked margin can also be expanded as experimental results indicated. Moreover, the compressor performance, especially the efficiency, on the whole working range is improved. As shown by experiments, the stall margin and choked margin of the compressor are extended, and the maximum efficiency improvement is 14% at the large flowrate of 1.386. Numerical simulations were carried out to analyze the flow in the impeller and in the holes in the case of large flowrate. The results indicate that in large flowrate conditions, there is a low-pressure region on the throat part of the impeller passage, leading to the bypass flows appearing in the holes, which means the flow area at the inlet of the impeller is increased. The bypass flow can also contribute to the decrease of the Mach number at the throat part near the shroud end-wall which implies that the choked margin is expanded. Besides, as the bypass flow would inhibit the development of the vertexes in the tip clearance and suppress the flow recirculation in the shroud end-wall region, both the pressure ratio and efficiency of the compressor are improved, which agrees well with the experiments. holed casing treatment, centrifugal compressor, numerical simulations, large flowrate condition Citation:Xu W, Wang T, Gu C G. Performance of a centrifugal compressor with holed casing treatment in the large flowrate condition.

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“…Tip injection has also been demonstrated as an effective tool for recovering a compressor from fully developed stall. In a self-induced (passive) solution, steady discrete tip injection using casing recirculation has been simulated in a single transonic fan rotor (Hathaway, 2002). The idea was to bleed pressurized fluid from downstream of the rotor and properly inject it upstream.…”

Section: Air Injectionmentioning

confidence: 99%