Evaluation of the effectiveness of typical casing treatments for a low-speed compressor by an integral method

Xiao, Nan; Ma, Ning; Li, Jichao; Liu, Le; Feng, Lin

doi:10.1016/j.ast.2016.03.001

Cited by 12 publications

(5 citation statements)

References 12 publications

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“…At the same time, the same CFD result at the near stall point of the smooth casing was used to construct the bell curve and compare it with those of the smooth casing, a double-grooved casing (generated separately for another paper [16]), a five-grooved casing, and a SAS casing. The resultant bell curves are depicted in [19], which predicted that the SMI of SELF-INJ should be similar to the double-grooved CG13 (not shown in the figure), much less than the other two casing treatments. The test results are given in Table 2 [19], which confirmed the prediction in Figure 19.…”

Section: Tip Air Injection With Self-recirculationmentioning

confidence: 99%

“…The resultant bell curves are depicted in [19], which predicted that the SMI of SELF-INJ should be similar to the double-grooved CG13 (not shown in the figure), much less than the other two casing treatments. The test results are given in Table 2 [19], which confirmed the prediction in Figure 19.…”

Section: Tip Air Injection With Self-recirculationmentioning

confidence: 99%

“…Since the MF/TLF interface is a 3D surface, such as the one in Figure 11, it is not surprising that using Xzs alone is not sufficient to correlate it to stall. A control volume approach is thus proposed to include the 3D effect into a new model [16,19]. Unfortunately, it is impossible to establish an analytical equation like the one for Xzs due to the complexity of the 3D unsteady flow.…”

Section: The Role Of Axial Momentum and The (Bell-shaped) Curvementioning

confidence: 99%

“…The bell-shaped curves for the studied casing treatments ([19]). Figure reproduced from NAN et al (2015).…”

mentioning

confidence: 99%

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Oscillatory Tip Leakage Flows and Stability Enhancement in Axial Compressors

Feng

Chen

2018

International Journal of Rotating Machinery

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Rotating stall axial compressor is a difficult research field full of controversy. Over the recent decades, the unsteady tip leakage flows had been discovered and confirmed by several research groups independently. This paper summarizes the research experience on unsteady tip leakage flows and stability enhancement in axial flow compressors. The goal is to provide theoretical bases to design casing treatments and tip air injection for stall margin extension of axial compressor. The research efforts cover (1) the tip flow structure at near stall that can explain why the tip leakage flows go unsteady and (2) the computational and experimental evidences that demonstrate the axial momentum playing an important role in unsteady tip leakage flow. It was found that one of the necessary conditions for tip leakage flow to become unsteady is that a portion of the leakage flow impinges onto the pressure side of the neighboring blade near the leading edge. The impediment of the tip leakage flow against the main incoming flow can be measured by the axial momentum balance within the tip range. With the help of the theoretical progress, the applications are extended to various casing treatments and tip air recirculation.

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Section: Tip Air Injection With Self-recirculationmentioning

confidence: 99%

Section: Tip Air Injection With Self-recirculationmentioning

confidence: 99%

Section: The Role Of Axial Momentum and The (Bell-shaped) Curvementioning

confidence: 99%

“…The bell-shaped curves for the studied casing treatments ([19]). Figure reproduced from NAN et al (2015).…”

mentioning

confidence: 99%

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Oscillatory Tip Leakage Flows and Stability Enhancement in Axial Compressors

Feng

Chen

2018

International Journal of Rotating Machinery

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“…As a flow control technology, the circumferential groove was widely used to improve the flow stability of the compressor. [26][27][28] The performance enhancement mechanism of the circumferential groove can be summarized in three aspects. First, the circumferential groove had a positive impact on the TLF.…”

Section: Introductionmentioning

confidence: 99%

Circumferential groove on flow field and pressure fluctuation intensity of a semi-open centrifugal pump under design condition

Wang

Luo

Jiang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The tip leakage flow (TLF) generated by the tip clearance has adverse effect on the performance of the impeller and increases pressure fluctuation. To suppress the effect of TLF on the instable flow in a semi-open centrifugal pump, the circumferential groove method is proposed in this paper. The effect of the circumferential groove on the internal flow and pressure fluctuation under the design condition is studied by combining numerical simulation with experiment. The results show that the head and efficiency were reduced by 1.1% and 1.0%, respectively. However, the circumferential groove provided a circumferential channel for leading edge overflow. The fluid in the groove formed a jet near the low-pressure region, which can effectively disperse the low-energy fluid of the blade inlet. The initial position and trajectory of the tip leakage vortex (TLV) move downstream, which decreases the relative flow angle and low-velocity region. The flow field in the blade tip region was improved remarkably. The low-frequency pressure fluctuation in the pressure surface and tip clearance of the blade inlet was suppressed by the circumferential groove, and pressure pulsation intensity decreased by 50% and 66%, respectively.

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Joos¹

2020

Aerodynamik Axialer Turbokompressoren

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Evaluation of the effectiveness of typical casing treatments for a low-speed compressor by an integral method

Cited by 12 publications

References 12 publications

Oscillatory Tip Leakage Flows and Stability Enhancement in Axial Compressors

Oscillatory Tip Leakage Flows and Stability Enhancement in Axial Compressors

Circumferential groove on flow field and pressure fluctuation intensity of a semi-open centrifugal pump under design condition

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