Numerical investigations on tip leakage flow characteristics and vortex trajectory prediction model in centrifugal compressor

Zhao, Hao; Wang, Zhiheng; Ye, Shubo; Xi, Guang

doi:10.1177/0957650916673230

Cited by 10 publications

(14 citation statements)

References 40 publications

(112 reference statements)

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“…The interface spills from the adjacent blade leading edge, and becomes more aligned with the leading edge plane near the stall condition. 6 For transonic centrifugal impellers, the flow behavior is complex in terms of the TLV, shock wave and boundary layer interaction due to the presence of the shock wave. 6,7 For a centrifugal impeller with splitter blades, the TLV of the main and splitter blades are mixed, leading to the increased unsteadiness.…”

Section: Introductionmentioning

confidence: 99%

“…6 For transonic centrifugal impellers, the flow behavior is complex in terms of the TLV, shock wave and boundary layer interaction due to the presence of the shock wave. 6,7 For a centrifugal impeller with splitter blades, the TLV of the main and splitter blades are mixed, leading to the increased unsteadiness. 8 For a centrifugal impeller with a vaned diffuser, the interaction between the impeller blades and the diffuser blades also causes unsteadiness.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al. 6 found that Chen's model lacked the sufficient prediction accuracy of the TLV trajectory for centrifugal impellers. Based on Chen's model, Zhao et al.…”

Section: Introductionmentioning

confidence: 99%

“…Based on Chen's model, Zhao et al. 6 altered the tip parameters to predict the centrifugal impeller's TLV trajectory. The coefficient k remained constant with the mass flow, and was set as a function of the ratio of tip clearance size and maximum tip blade thickness.…”

Section: Introductionmentioning

confidence: 99%

“…However, this model is not appropriate to be utilized for centrifugal impellers' one-dimensional stall-onset prediction. It can be explained as follows: (1) the TLF velocity in Ye's model is known from the computational fluid dynamics (CFD) results, not modeled; (2) the average main flow velocity near the shroud is equal to the inlet meanline velocity, which is not accurate; (3) the TLV trajectory predicted by Chen's model lacks the sufficient accuracy for centrifugal impellers, which has been proved by Zhao's work; 6 (4) for a subsonic centrifugal impeller, the effective origin of the tip leakage flow cannot be determined by considering the ITLMF deflection, so it must be determined again.…”

Section: Introductionmentioning

confidence: 99%

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One-dimensional modeling for tip clearance leakage vortex trajectory and stall-onset prediction in subsonic centrifugal impellers

Zhang

Dong

Liu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Two one-dimensional models are established for the tip leakage vortex trajectory and rotating stall-onset point prediction respectively for subsonic centrifugal impellers. The goal of modeling is to supply an effective estimation strategy of the stall-onset point for use in the one-dimensional performance prediction stage. The tip leakage vortex trajectory prediction is a critical part of the stall-onset prediction. The proposed one-dimensional model (one-dimensional tip leakage vortex trajectory model) to predict the tip leakage vortex trajectory is based on blade loading, i.e. the velocity difference between the pressure and suction surfaces. The loading function considers the effect of radial rotation, blade turning, and passage width variation. Compared with the computational fluid dynamics results, the current model shows reasonable accuracy, with an average relative error below 12.35%. The one-dimensional prediction model (Model II) is developed to determine the stall-onset point, where the interface between the tip leakage flow and the main flow spills from the blade leading edge. In this model, the momentum balance analysis is applied to identify the position of the interface. The parameter of the tip leakage vortex trajectory in Model II is determined by one-dimensional tip leakage vortex trajectory model. The effective origin of the tip leakage flow is correlated with the rotational speed and tip clearance. The effectiveness of Model II is validated with the experimental and computational fluid dynamics results using three impellers. Compared with the conventional model (Model I), Model II shows better accuracy, with a maximum error of about 7.42%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Zhao et al. 6 found that Chen's model lacked the sufficient prediction accuracy of the TLV trajectory for centrifugal impellers. Based on Chen's model, Zhao et al.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

One-dimensional modeling for tip clearance leakage vortex trajectory and stall-onset prediction in subsonic centrifugal impellers

Zhang

Dong

Liu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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show abstract

Vortex trajectory prediction and mode analysis of compressor stall with strong non-uniformity

Yang

et al. 2020

Aerospace Science and Technology

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Role of wall roughness on interaction of leakage flow and main flow in a mixed flow pump with tip clearance

Han,

Tan,

Han

2024

Physics of Fluids

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Due to machining precision, spraying coating, cavitation, and erosion, walls of pump flow passage components have different roughness, which will affect the flow state near the wall and even the main flow. In the present work, four types of roughness Ra = 0, 0.1, 1, and 10 μm are set to investigate the influence of wall roughness on the interaction of leakage flow and main flow in a mixed flow pump with tip clearance. Results show that the interaction area of leakage flow and main flow can be divided into three regions: (a) tip clearance zone, (b) shear flow zone, and (c) primary vortex zone. In the tip clearance zone, as roughness increases, the velocity magnitude and its derivative at the same wall distance gradually decrease, and the velocity angle at blade tip continuously increases in the inner circular boundary layer. As the roughness increases, the leakage flow gradually decreases, especially in the center chord region. In the shear flow zone, the velocity gradient rapidly decreases along the direction of pressure side to suction side, and finally, it becomes stable. As roughness increases, the velocity gradient intensity decreases, and the main reason is that the differences of velocity magnitude and velocity direction between the inner circular boundary layer and potential region decrease. In the primary vortex zone, the tip leakage vortex core indicated by the Liutex vortex method coincides with the low-pressure core location. As the roughness increases, the tip leakage vortex core becomes closer to the next blade. The pressure coefficient and vorticity of the tip leakage vortex core decrease with increasing of roughness, and the slopes remain constant on different cross sections with value of 5.9 × 103 and 2.4 × 103 m−1, respectively.

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Numerical investigations on tip leakage flow characteristics and vortex trajectory prediction model in centrifugal compressor

Cited by 10 publications

References 40 publications

One-dimensional modeling for tip clearance leakage vortex trajectory and stall-onset prediction in subsonic centrifugal impellers

One-dimensional modeling for tip clearance leakage vortex trajectory and stall-onset prediction in subsonic centrifugal impellers

Vortex trajectory prediction and mode analysis of compressor stall with strong non-uniformity

Role of wall roughness on interaction of leakage flow and main flow in a mixed flow pump with tip clearance

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