An improved formula for determination of secondary energy losses in the runner of Kaplan turbine

Bozic, I.; Benisek, M.

doi:10.1016/j.renene.2016.03.093

Cited by 27 publications

(9 citation statements)

References 12 publications

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“…Ramos et al [34] analyzed four penstock systems commonly used with propeller turbines, and recommend that open-channel systems, such as the open flume, should be used, since their hydraulic losses are smaller than the losses of the Kaplan turbines. Bozic and Benizek [35] identified the profile and secondary losses of OFTs using numerical methods.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effect of gaps between the blades of open flume Pico hydro turbine runners

Adanta

Budiarso

Warjito

et al. 2019

JMES

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This study will analyze the impact of gap size in two different runners called runner A (five blades) and B (six blades) to provides recommendations in design and manufacture of open flume turbine runners so that maximize the conversion of kinetic and potential energy. There are three methods was used to investigate its: analytical method is used to design the turbine; experimental to determine the actual turbine performance; computational fluid dynamics (CFD) to study the physical phenomena and re-check the velocity triangle on the runner to validate the design and manufacturing process. Using the results obtained, gaps between the blades can alter the velocity vector on the outlet and unbalance the rotation of runner; this imbalance could cause cavitation. Then, the decreasing torque is assumed because water pressure in the draft tube is similar to atmospheric pressure. Two conditions must be satisfied to maximize the performance of the turbine: swirling flow is required after the water flows past the runner in order to minimize the radial velocity on the outlet so that the draft tube can function properly; the dimensions of the blade must be carefully selected to avoid the formation of gaps between the blades.

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Section: Introductionmentioning

confidence: 99%

Investigation of the effect of gaps between the blades of open flume Pico hydro turbine runners

Adanta

Budiarso

Warjito

et al. 2019

JMES

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“…The SST k-ω model was used to resolve the flow equations in the AFT. The suitability of SST k-ω in predicting the flow behavior within hydraulic machinery has been established by several researchers (Božić and Benišek 2016;Sotoude Haghighi et al 2019. Menter (1993) and Wilcox (1994) comprehensively proved the SST model as an improved k-ω turbulence model.…”

Section: Turbulence Modelmentioning

confidence: 99%

Numerical and Experimental Investigation on Unsteady Flow and Hydraulic Radial Force of Low-Head Axial Flow Turbine

2023

JAFM

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Radial force in low-head axial flow turbines (AFTs) is an influential factor in their operational stability. To explore the transient operating behavior of the radial force in low-head AFTs under different blade numbers, transient numeric computations were executed with the shear stress transport (SST) k-w turbulent model. Turbine performance was numerically computed and compared with results from experiments. Furthermore, the unsteady flow field pulsations were experimentally verified by means of pressure sensors. The radial forces on the runners (z = 2, 3, and 4) were each numerically studied in time, frequency, and joint time–frequency fields. The result reveals that the radial force acting on the runner varies with time, since periodic radial forces reflect the vane number on the stay vanes with minimal runner effect. Moreover, the amplitude of the radial forces is directly proportional to the flow rate. Furthermore, the spectral analysis shows that the radial force frequency is close to the blade passing frequency and also increases radially outward since peak values were recorded in this region. Minimal radial force amplitudes were recorded when z = 3, across all flow conditions, making this configuration suitable for smooth and reliable operation. The unstable pressure and force pulses that affect the noise and vibration produced in the turbine are instigated by the flow exchange that occurs between the guide vane and the runner. In order to optimize turbines for increased operational dependability, the acquired data would be crucial references for noise and vibration analytical investigations.

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“…The research on axial flow impeller has always been the focus of scholars’ attention. 11,12 Bozic et al 13 studied the profile and secondary energy loss of axial-flow runner. They analyzed the distribution of secondary losses in the total losses.…”

Section: Introductionmentioning

confidence: 99%

Influence of tip clearance inclination on the performance of axial flow impeller in storage mode

Zhu

Jin

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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Tidal energy is one of the most mature energy sources used in all kinds of ocean energy. Axial flow impeller plays a key role in converting potential energy and kinetic energy of seawater into electric energy. In this study, aiming at the problem of three different clearance inclination in axial flow impeller, the axial flow impeller is studied by numerical simulation and experimental verification. The results show that the efficiency first decreases rapidly, then fluctuates within a certain range, and then decreases rapidly as the inclination changes from negative to positive. When the positive inclination is larger, the axial force and radial force are smaller. Meanwhile, the length of the clearance leakage vortex and the included angle with the axial direction are smaller. This paper provides a reference for improving the utilization efficiency of tidal energy. It also has guiding significance for the design of axial flow impeller.

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An improved formula for determination of secondary energy losses in the runner of Kaplan turbine

Cited by 27 publications

References 12 publications

Investigation of the effect of gaps between the blades of open flume Pico hydro turbine runners

Investigation of the effect of gaps between the blades of open flume Pico hydro turbine runners

Numerical and Experimental Investigation on Unsteady Flow and Hydraulic Radial Force of Low-Head Axial Flow Turbine

Influence of tip clearance inclination on the performance of axial flow impeller in storage mode

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