Design and Simulation of Very Low Head Axial Hydraulic Turbine with Variation of Swirl Velocity Criterion

Muis, Abdul; Sutikno, Priyono

doi:10.5293/ijfms.2014.7.2.068

Cited by 21 publications

(5 citation statements)

References 2 publications

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“…The turbine runner was designed on the basis of free-vortex theory combined with Euler's head equation; the design process of the turbine runner was presented in detail in previous research performed by Tran et al [18]. The well-known free-vortex theory originally comes from the law of conservation of angular momentum that was applied in designing several types of compressible and incompressible flow machinery [19,20]. The current surveyed turbine was developed to operate with a gross head of 2 m, a rated flow of 0.25 m 3 /s, and a rotational speed of 450 rpm.…”

Section: Physical Model Of Propeller Turbinementioning

confidence: 99%

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

et al. 2020

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Unavoidable tip clearance between blade tip and casing shroud plays an important role in the performance and characteristics of a tidal propeller turbine. In this work, the tip-leakage vortex (TLV) induced in the end-wall region was numerically illustrated by using the shear-stress transport (SST) k–ω turbulence model at various flow conditions and different tip-clearance sizes (TCSs). The swirling strength criterion was employed to visualize the tip-leakage vortex trajectory and investigate vortex evolution according to clearance size change. Although TLV occurs in both design and off-design conditions, vortex intensity develops strongly under excess flow rate with increased tip gap. The extreme influence of TCS on the turbine’s generated power and efficiency was predicted in steady simulations for four TCS cases, namely, δ = 0%, 0.25%, 0.5%, and 0.75%. With the extension of the tip gap, turbine performance was drastically reduced because of vigorous turbulent leakage flow combined with considerable volumetric loss. The effect of TCS on pressure fluctuation intensity were also explored on the basis of the transient simulation statistic. Maximal pressure variation amplitude and dominant frequency were presented in spectrum analysis utilizing fast Fourier transform.

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Section: Physical Model Of Propeller Turbinementioning

confidence: 99%

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

et al. 2020

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“…This type is the very low head single rotor turbine or VLHSRT. Although this turbine can work with high efficiency [1,2,3], the authors wishes to be able to improve and developing application of this turbine type in order to expand its use. For this reason, design of the very low head turbine is developed which using two rotors that rotating in opposite.…”

Section: Turbine Designmentioning

confidence: 99%

Comparative Study on Performance of Very Low Head Axial Hydraulic Turbine Using a Single Rotor and a Contra-Rotating Rotor

Muis¹,

Sutikno²,

Suwono³

et al. 2015

AMM

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Studies conducted on axial flow hydraulic turbine by comparing the performance of turbines which use a single rotor and two rotors that rotate in opposite (contra-rotating). Both turbines are designed to generate energy utilizing a very low head water flow. Single rotor turbine consists of one row of guide vane and one row of rotor blade. Contra-rotating rotor turbine consists of one row of guide vane and two rows of rotor blade, which is the front rotor blade also serves as a guide vane for the rear rotor. Both of turbines are designed for the same flow and operating conditions. The results of numerical studies show that both of turbines can be applied with a fairly high efficiency, however the single rotor turbine is significantly higher. Especially for contra-rotating turbine, the total power that generated at the same operating conditions will increase because powers are resulted from both of rotors, but the effective head required will be significantly increase compare to the single-rotor turbine. These results may be used as a reference in the development of axial flow hydraulic turbine for very low head sites to expand the applications. Keywords: Single rotor, contra-rotating rotor, axial flow, very low head, hydraulic turbine.

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“…In lower loads, the blades are adjusted in a specific way to obtain best efficiency which needs supplementary adjustments of guide vanes stagger angel to create fully axial flow at the runner outlet [14]. Muis and Sutikno [15] considered swirl velocity, free vortex, and forced vortex to design the runner of a VLH turbine using Goettingen0480 airfoil. They applied kω-SST model to solve the 3D flow in the turbine, and their numerical results showed that the generated power for forced vortex criterion is 15% higher than the power produced by free vortex criterion.…”

Section: Introductionmentioning

confidence: 99%

Design and performance optimization of a very low head turbine with high pitch angle based on two-dimensional optimization

Mohammadi

Riasi

Rezghi

2019

J Braz. Soc. Mech. Sci. Eng.

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Very low head (VLH) axial hydro turbines are efficient turbomachinery to harness energy from tidal or river currents and increase renewable energy penetration in the world's electric power generation. In this paper, the initial design of a VLH turbine with high pitch blade is optimized. The class function/shape function transformation method is applied along with a coupling of XFOIL with a MATLAB code to find optimum blade profiles with minimum drag-to-lift ratio. SST k-ω turbulence model is implemented to solve three-dimensional (3D) continuity and RANS equations by considering homogeneous multiphase model with standard free surface flow. The numerical results are validated against available experimental measurements, and the optimization results are discussed. The numerical results indicated that efficiency and power of the VLH turbine at the design point increased by 2.4% and 7.7 kW, respectively. Analyzing pressure distribution on suction and pressure sides of runner blades showed no occurrence of cavitation in operating condition of the turbine.

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Design and Simulation of Very Low Head Axial Hydraulic Turbine with Variation of Swirl Velocity Criterion

Cited by 21 publications

References 2 publications

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

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

Comparative Study on Performance of Very Low Head Axial Hydraulic Turbine Using a Single Rotor and a Contra-Rotating Rotor

Design and performance optimization of a very low head turbine with high pitch angle based on two-dimensional optimization

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