Method of C groove on vortex suppression and energy performance improvement for a NACA0009 hydrofoil with tip clearance in tidal energy

Liu, Yabin; Tan, Lei

doi:10.1016/j.energy.2018.04.174

Cited by 80 publications

(18 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present paper, a steady-state Reynolds averaged Navier-Stokes (RANS) equation and the SST k-ω turbulence model [22,29,30] with all y+ wall treatment were used to calculate the flow field within the gap; then, the acoustics models available in STAR_CCM+ 13.02, including the Curle and Proudman broadband noise models, were adopted to investigate the broadband noise sources. The Segregated flow model was used to compute each of the momentum equations in turn.…”

Section: Methodsmentioning

confidence: 99%

“…It should be noted that the SST k-ω turbulence model has its own limitations, errors and uncertainties [31]. However, the SST k-ω turbulence model is widely used to investigate the detail flow field in tip clearance for a NACA0009 hydrofoil [22,29]. Consequently, the SST k-ω turbulence model with all y+ wall treatment is employed to evaluate the effect of T-shape tips on energy performance and flow patterns in the gap.…”

Section: Methodsmentioning

confidence: 99%

“…As the clearance edge becomes round on the pressure side, the optimal tip scheme can eliminate cavitation. Recently, Liu et al [29] presented interesting work: the C groove method can reduce the TLV formation and enhance energy performance within a NACA0009 hydrofoil. Under all conditions, the C groove method exhibited the ability of promoting energy performance and suppressing TLV.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of T-Shape Tip Clearance on Energy Performance and Broadband Noise for a NACA0009 Hydrofoil

et al. 2019

Self Cite

View full text Add to dashboard Cite

In the present paper, the effect of the proposed T-shape tip on the energy performance, flow patterns and broadband noise sources of a NACA0009 hydrofoil with tip clearance is investigated. The vortex induced by the gap is simulated by means of the SST k-ω turbulence model, and then, the noise generated by dipoles and quadrupoles are analyzed by using the Curle acoustic analogy and Proudman acoustic analogy, respectively. The numerical simulation results agree well with the experimental measurements. Results indicate that three tip shapes, including the half pressure side T-shape model (MPT), the half suction side T-shape model (MST) and the T-shape model (MT), have complex influence on energy performance of the foil. Only the MST model can promote the energy performance of the hydrofoil at all inlet velocities, with the maximum ratio of lift coefficient to drag coefficient increasing by 4.26%. In addition, the ratio of lift coefficient to drag coefficient for MT obviously increases when the inlet velocity is 7.5 m/s, 10 m/s, 12.5 m/s and 15 m/s, and the maximum promotion is 15.21% at 7.5 m/s. The T-shape tip can effectively suppress the tip clearance leakage vortex, which makes the vortex area decrease with a maximum drop of 5.02%. Furthermore, the MPT and MT have good suppression effect on the hydrofoil dipole noise, and reduce the maximum Curle Acoustic Power (AP) of the foil with 2.64% and 3.03%, respectively. The MST model obviously reduces the isosurface area of the Proudman AP by 6.55% for 55 dB.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influence of T-Shape Tip Clearance on Energy Performance and Broadband Noise for a NACA0009 Hydrofoil

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…Inspired by work on TLV suppression for gas turbines, compressors, and fans, Liu et al [82] first proposed an advanced C-groove method to suppress the TLV and further improve the energy performance of a hydrofoil in tidal energy, as shown in Figure 34. Their results show that the proposed C-groove successfully suppresses the primary TLV in its inception stage by groove-jet impingement and weakens the secondary TLV by the groove-channel flow, which is illustrated in Inspired by work on TLV suppression for gas turbines, compressors, and fans, Liu et al [82] first proposed an advanced C-groove method to suppress the TLV and further improve the energy performance of a hydrofoil in tidal energy, as shown in Figure 34. Their results show that the proposed C-groove successfully suppresses the primary TLV in its inception stage by groove-jet impingement and weakens the secondary TLV by the groove-channel flow, which is illustrated in Figure 35.…”

Section: Tip Shapementioning

confidence: 99%

“…Blade-tip thickening Ducted propeller [80] Both the strength of TLV and pressure drop in the TLV core on the middle chord section are reduced T-shape tip mixed-flow pump [81] This tip shape can improve pump efficiency by 1.86% and reduce leakage flow rate by 15.95% C groove Hydrofoil [82] C groove maximally suppresses tip-leakage vortex by 67.94%, and improves energy performance by 2.79%.…”

Section: Optimization Scheme Machinery Type Conclusionmentioning

confidence: 99%

A Review of Tip Clearance in Propeller, Pump and Turbine

2018

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Stationary stall phenomenon and pressure fluctuation in a centrifugal pump at partial load condition

et al. 2019

View full text Add to dashboard Cite

Method of C groove on vortex suppression and energy performance improvement for a NACA0009 hydrofoil with tip clearance in tidal energy

Cited by 80 publications

References 33 publications

Influence of T-Shape Tip Clearance on Energy Performance and Broadband Noise for a NACA0009 Hydrofoil

Influence of T-Shape Tip Clearance on Energy Performance and Broadband Noise for a NACA0009 Hydrofoil

A Review of Tip Clearance in Propeller, Pump and Turbine

Stationary stall phenomenon and pressure fluctuation in a centrifugal pump at partial load condition

Contact Info

Product

Resources

About