Influence of Tip Clearance on Flow Characteristics of Axial Compressor

Song, Moru; Xie, Hong; Yang, Bo; Zhang, Shuyi

doi:10.3390/pr8111445

Cited by 5 publications

(1 citation statement)

References 30 publications

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“…Ma et al [3] conducted an analysis of the flow characteristics within the tip clearance of a Kaplan turbine through the utilization of ANSYS CFX simulations. Song et al [4] elucidated the significance of the tip leakage flow through an examination of the flow field in the tip region. Han et al [5,6] applied large eddy simulation in conjunction with the Zwart-Gerber-Belamri cavitation model to numerically analyze turbulent cavitation flow near the tip clearance of a propulsion pump.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Tip Clearance on Cavitation Performance and Entropy Production of an Axial Flow Pump

Yu,

Cheng,

et al. 2024

JMSE

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The clearance existing between the impeller rim and the adjacent shroud within the pump configuration establishes conducive circumstances for the initiation of cavitation. The bubbles generated by cavitation will flow forward with the water, blocking the channel, and result in the degradation of the pump performance. When the cavitation is severe, vibration and noise will be generated. The impact formed by the collapse of the bubbles will seriously erode the blades and form pits on the blade surfaces. Drawing upon the outcomes derived from numerical simulations, this paper investigates the relationship between tip clearance and cavitation in an axial flow pump, with a specific focus on energy dissipation characteristics. The principal findings indicate that the dimensions of the tip clearance predominantly influence the spatial distribution of the tip leakage vortex (TLV) cavitation. The entropy production rate distribution at the tip correlates with both the cavitation level of the pump and the extent of the tip clearance. The shedding phenomenon of the TLV becomes more evident when analyzing the distribution of entropy production rates. During cavitation, an increased tip clearance is associated with a reduction in the dissipation of viscous entropy production within the impeller domain, and the entropy production resulting from turbulent dissipation significantly surpasses that arising from viscous dissipation.

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Section: Introductionmentioning

confidence: 99%

Study on the Influence of Tip Clearance on Cavitation Performance and Entropy Production of an Axial Flow Pump

Yu,

Cheng,

et al. 2024

JMSE

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Numerical and experimental investigations of tip clearance effects in a high-flow-coefficient centrifugal compressor

Zhao

Yang

Zhang

et al. 2022

International Journal of Turbo &Amp; Jet-Engines

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This paper focuses on the investigation of the blade deformation and tip clearance effects of a high-flow-coefficient centrifugal compressor. Blade deformation caused by the pressure load and centrifugal load under operating condition is considered by fluid/solid interaction method to simulate the stage performance accurately. Hence the numerical results are in good agreement with the experimental data. The blade deformation is then analyzed in detail. Also, the effect of the size of tip clearance is studied by evaluating the performance with five various gaps. The result shows that the increment of the tip clearance from 0 to 2.0 mm leads to a 5.14% peak efficiency decline. However, increasing tip gap contributes to enlarge the stable operating range in terms of stall margin and choke margin.

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Study on the Influence of Tip Clearance on Working Characteristics of High-Altitude Fan

Qu,

He,

Duan

et al. 2024

Aerospace

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To study the influence of tip clearance on the working characteristics of high-altitude fans, this paper takes the MIX-140 high-altitude fan as the research object. Five different tip clearance (TC) models are selected. The CFD method is used to analyze the changes in the working characteristics of the fan under different flow rates and TCs in ground and high-altitude environments. The reliability of the numerical method is verified through a fan test bench. The results show that the tip leakage flow caused by the TC will continuously deteriorate the working characteristics of the fan. Under the rated flow rate in the ground environment, for every doubling of the blade’s TC, the static pressure difference will decrease by 5%, the efficiency will decrease by 2%, and the power will decrease by 3%. In a high-altitude environment, the flow rate corresponding to the maximum shaft power point of the fan will continuously increase with an increase in the tip clearance, which will bring about additional energy consumption. For high-altitude fans, the deformation caused by the high-speed rotation of the impeller needs to be taken into account. Undoubtedly, it is advantageous to choose the smallest possible tip clearance value. The results of the analysis and test methods in this paper will provide a basis for designing the tip clearance of high-altitude fans.

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Influence of Tip Clearance on Flow Characteristics of Axial Compressor

Cited by 5 publications

References 30 publications

Study on the Influence of Tip Clearance on Cavitation Performance and Entropy Production of an Axial Flow Pump

Study on the Influence of Tip Clearance on Cavitation Performance and Entropy Production of an Axial Flow Pump

Numerical and experimental investigations of tip clearance effects in a high-flow-coefficient centrifugal compressor

Study on the Influence of Tip Clearance on Working Characteristics of High-Altitude Fan

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