Symmetrical and unsymmetrical tip clearances on cavitation performance and radial force of a mixed flow pump as turbine at pump mode

Hao, Yong Ping; Tan, Lei

doi:10.1016/j.renene.2018.04.072

Cited by 197 publications

(80 citation statements)

References 39 publications

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“…Machinery Type Performance Change 0-1 mm Mixed-flow pump [5,6] Head drops by 10% at design flow rate; efficiency drops by 4% at design flow rate; pressure fluctuation near blade-trailing edge increases by 20 times; unsymmetrical tip clearance deteriorates cavitation performance and increases radial-force fluctuation.…”

Section: Tip-clearance Rangementioning

confidence: 99%

“…Rotor-stator interaction [74,75] is the main factor of radial force, but the tip clearance and its induced unsteady flow can also affect the characteristics of radial force. Hao [6,76] studied the radial force in a mixed-flow pump with symmetrical and asymmetrical tip clearances: the radial force trajectory on the principle axis is enclosed, consisting of six individual ellipses due to the rotor-stator interaction (six guide vanes), as shown in Figure 30. Asymmetrical tip clearances cause a significant offset of the trajectory center, and the average radial force increases sharply.…”

Section: Radial Forcementioning

confidence: 99%

“…The dominant frequency amplitude varies only slightly for different tip-clearance sizes under the symmetrical condition, but it dramatically increases under the asymmetrical condition (see Figure 31). Moreover, the asymmetrical tip clearance deteriorates the cavitation performance of the pump [6]. Consequently, the amplitude of radial force increases because of the cavitation deterioration, and the direction of radial force also changes due to the unsymmetrical distribution of the cavitation region.…”

Section: Radial Forcementioning

confidence: 99%

“…As shown in Table 1, tip clearance can induce tip-leakage flow and further influence the energy performance and operation stability of pump and turbine. The head and efficiency can be significantly influenced by the variation of tip clearance [5,6]. Therefore, the appropriate design of tip clearance is necessary to optimize the performance of pumps and turbines.…”

Section: Introductionmentioning

confidence: 99%

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A Review of Tip Clearance in Propeller, Pump and Turbine

2018

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Propellers, pumps, and turbines are widely applied in marine equipment, water systems, and hydropower stations. With the increasing demand for energy conservation and environmental protection, the high efficiency and the stable operation of pumps and turbine have been drawing great attention in recent decades. However, the tip clearance between the rotating impeller and the stationary shroud can induce leakage flow and interact with the main stream, introducing complex vortex structures. Consequently, the energy performance and the operation stability of pumps and turbines deteriorate considerably. Constant efforts are exerted to investigate the flow mechanism of tip-clearance flow and its induced influence on performance. However, due to various pump and turbine types and the complexity of tip-clearance flow, previous works are usually focused on a specific issue. Therefore, a systematic review that synthesizes the related research is necessary and meaningful. This review investigates related research in the recent two decades in the perspectives from fundamental physics to engineering applications. Results reveal the vortex types, trajectory, evolution, and cavitation behaviors induced by tip-clearance flow. It is concluded that the influence characteristics of tip clearance on energy performance are closely related to the machinery type. Tip-clearance size and tip shape are found to be crucial parameters for tip-leakage vortex (TLV). The proposed optimization schemes are also demonstrated to provide inspiration for future research. Overall, this review article provides a coherent insight into the characteristics of tip-clearance flow and the associated engineering-design applications. On the basis of these understandings, comments on conducted research and ideas on future research are proposed.

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Section: Tip-clearance Rangementioning

confidence: 99%

Section: Radial Forcementioning

confidence: 99%

Section: Radial Forcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Review of Tip Clearance in Propeller, Pump and Turbine

2018

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“…Both experimental and numerical approaches have been used to study compressor flow, with and without IGVs. Both can give valuable insight; however, both have their limitations.…”

Section: Introductionmentioning

confidence: 99%

A 1D mean line model for centrifugal compressors with variable inlet guide vanes

Dewar

Creamer²,

Dotcheva

et al. 2019

Engineering Reports

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This paper considers a 1D in‐line analytical model for centrifugal compressors with variable inlet guide vanes. A theoretical 1D model is developed to predict the effect of varying the inlet guide vane angle at different rotational speeds. An iterative algorithm is presented, which provides a fast and efficient method for evaluating the performance of the compressor under different operating conditions. The results from the analytical 1D model are presented and compared to full 3D CFD (computational fluid dynamics) simulations. The simulations validate the assumptions used in the 1D model and show good agreement between the two approaches over a range of vane angles. Qualitatively, both demonstrate the same trends as the vane angle and rotational velocities are varied. Quantitatively, the pressure ratio was found to agree within 8% and the temperature gain to within 15%. The 1D model was then modified to introduce a 5% loss in the diffuser and this was found to improve the 1D model predictions, with the pressure within 2% of the CFD value.

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Experimental Methods, Data, and Analysis

2024

Mixed Flow Pumps

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Symmetrical and unsymmetrical tip clearances on cavitation performance and radial force of a mixed flow pump as turbine at pump mode

Cited by 197 publications

References 39 publications

A Review of Tip Clearance in Propeller, Pump and Turbine

A Review of Tip Clearance in Propeller, Pump and Turbine

A 1D mean line model for centrifugal compressors with variable inlet guide vanes

Experimental Methods, Data, and Analysis

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