Effects of Tip Clearance Size on Energy Performance and Pressure Fluctuation of a Tidal Propeller Turbine

Tran, Bao Ngoc; Jeong, Haechang; Kim, Junho; Park, Jinsoon; Yang, Chang-Jo

doi:10.3390/en13164055

Cited by 18 publications

(12 citation statements)

References 28 publications

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“…, k; k is the total number of factors; β 0 is the y intercept, ∑ k i=1 β i x i is the Linear Effect; ∑ k i=1 β ii x 2 i is the Quadratic effect; and ∑ k−1 i=1 • ∑ k j=i+1 β ij x i x j is the cross-product effect. From research on the hydroelectric generator system driven by the vortex force [21][22][23][24][25][26], the waterpower equation [30][31][32] is as follows:…”

Section: Methodsmentioning

confidence: 99%

The Efficiency Comparison of Hydro Turbines for Micro Power Plant from Free Vortex

Sritram

Suntivarakorn

2021

Energies

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In this research paper, the relationship between a crossflow turbine and propeller turbine size changes and the pond size in a free vortex power generation system was investigated. This relationship can be written in the form of a new mathematical equation using the principles of the response surface methodology (RSM) method. This study aimed to compare the efficiency of a crossflow turbine and propeller turbine to enhance a micro power plant from free vortex. The pond size in a micro power plant from free vortex was 1 m in diameter and 0.5 m in height with a 0.2 m outlet drain at the bottom. All turbines were tested at different water flowrates of 0.2, 0.3, 0.4, 0.5, and 0.6 m3/s to identify the rpm, water head, voltage, and electric current to access the waterpower, power output, and overall efficiency. At a 0.02 m3/s water flowrate, the crossflow turbine had greater overall efficiency than the propeller turbine, reaching 9.09% efficiency. From the comparison of the results of the two turbines used in the 0.5 m high cylinder-shaped generator pond, the turbine type, turbine size (height and diameter), number of blades, and water flowrate are key factors that affect the overall efficiency. The crossflow turbine can achieve greater efficiency than the propeller turbine in this generator system.

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Section: Methodsmentioning

confidence: 99%

The Efficiency Comparison of Hydro Turbines for Micro Power Plant from Free Vortex

Sritram

Suntivarakorn

2021

Energies

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“…However, this concept fails to explain the destruction of micro objects (micro objects in Figure 1) within the cluster itself. When cavitation cluster features are modeled and analytical calculation methods for cavitation reactors are developed, the temperature is often not even included in the model parameters [14,15]. In [27], regarding the analysis of boiling processes, a model of the bubble ensemble dynamics is considered based on a model of the single bubble dynamics.…”

Section: Assessment Of Dynamic and Thermal Cavitation Effectsmentioning

confidence: 99%

“…For years, cavitation has been considered one of the areas of hydrodynamics associated with the elucidation and elimination of negative causes of erosion destruction of the surfaces of propellers, hydraulic turbine blades, and hydraulic devices [10][11][12]. It was determined that surfaces are eroded under the action of shock waves and cumulative jets formed by the micro-explosions of bubbles, considered as hollow caverns in hydrodynamics [13][14][15]. Within these mechanisms alone it is difficult to explain the destruction of molecular and colloidal structures and other cavitation effects at the microlevel in the liquid itself.…”

Section: Introductionmentioning

confidence: 99%

Application of Thermal and Cavitation Effects for Heat and Mass Transfer Process Intensification in Multicomponent Liquid Media

Pavlenko

Koshlak

2021

Energies

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In this paper, the authors consider the processes of dynamic interaction between the boiling particles of the dispersed phase of the emulsion leading to the large droplet breakup. Differences in the consideration of forces that determine the breaking of non-boiling and boiling droplets have been indicated in the study. They have been determined by the possibility of using the model to define the processes of displacement, deformation, or fragmentation of the inclusion of the dispersed phase under the influence of a set of neighboring particles. The dynamics of bubbles in a compressible liquid with consideration for interfacial heat and mass transfer has also been analyzed in the paper. The effect of standard and system parameters on the intensity of cavitation processes is considered. Physical transformations during the cavitation treatment of liquid are caused not only by shock waves and radiated pressure pulses but also by extreme thermal effects. At the stage of ultimate bubble compression, vapor inside the bubble and the liquid in its vicinity transform into the supercritical fluid state. The model analyzes microflow features in the inter-bubble space and quantitatively calculates local values of the velocity and pressure fields, as well as dynamic effects.

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“…Tip-clearance effect has been studied extensively in pumps as well as in other machines. In the literature [29][30][31], the effect of tip clearance on the performance of other turbomachinery was also investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of Tip Clearance on Helico-Axial Flow Pump Performance at Off-Design Case

et al. 2021

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To reveal the effect of tip clearance on the flow behaviors and pressurization performance of a helico-axial flow pump, the standard k-ε turbulence model is employed to simulate the flow characteristics in the self-developed helico-axial flow pump. The pressure, streamlines and turbulent kinetic energy in a helico-axial flow pump are analyzed. Results show that the tip leakage flow (TLF) forms a tip-separation vortex (TSV) when it enters the tip clearance and forms a tip-leakage vortex (TLV) when it leaves the tip clearance. As the blade tip clearance increases, the TLV moves along the blade from the leading edge (LE) to trailing edge (TE). At the same time, the entrainment between the TLV and the main flow deteriorates the flow pattern in the pump and causes great hydraulic loss. In addition, the existence of tip clearance also increases the possibility of TLV cavitation and has a great effect on the pressurization performance of the helico-axial flow pump. The research results provide the theoretical basis for the structural optimization design of the helico-axial flow pump.

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Effects of Tip Clearance Size on Energy Performance and Pressure Fluctuation of a Tidal Propeller Turbine

Cited by 18 publications

References 28 publications

The Efficiency Comparison of Hydro Turbines for Micro Power Plant from Free Vortex

The Efficiency Comparison of Hydro Turbines for Micro Power Plant from Free Vortex

Application of Thermal and Cavitation Effects for Heat and Mass Transfer Process Intensification in Multicomponent Liquid Media

Effect of Tip Clearance on Helico-Axial Flow Pump Performance at Off-Design Case

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