Some effects of turbine inertia on the starting performance of vertical-axis hydrokinetic turbine

Tigabu, Muluken Temesgen; Khalid, Muhammad Saif Ullah; Wood, David Murakami; Admasu, Bimrew Tamrat

doi:10.1016/j.oceaneng.2022.111143

Cited by 13 publications

(18 citation statements)

References 31 publications

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“…It has been reported that initial orientation of the blades dictates whether self-startup would occur or not, with some orientations producing negative torque values, resulting in self-startup failure. Start-up occurred at AoA of 40° and comprises of the same four stages as observed by Tigabu et al [24]. Start-up failure was recorded at AoAs of 70° and 150°, providing insights into the dead band range of AoAs.…”

Section: Drag-based Rotorssupporting

confidence: 67%

“…Therefore, it can be concluded that higher the solidity of a VAWT, the faster it will be able to self-start. Tigabu et al [24] observed significantly different start-up dynamics for a lift-based hydrokinetic turbine, as can be seen in Figure 2. It has been reported that during the start-up of the turbine, four stages have been recorded.…”

Section: Lift-based Vawtsmentioning

confidence: 92%

“…An important point to note here is that Tigabu et al [24] carried out numerical simulations on the hydrokinetic turbine, where the inertia of the turbine is based solely on the mass moment of inertia, and the bearing friction and generator loads are not considered, which by default were present in case of Asr et al's [8] experimental work. Sun et al [13] incorporated the bearing friction and generator loads in their numerical investigations through the introduction of external loading coefficient (Cload).…”

Section: Lift-based Vawtsmentioning

confidence: 99%

“…an accurate value of inertia is of utmost important when quantifying the start-up dynamics of VAWTs, else the numerically predicted steady-operational λ will be significantly higher. Tigabu et al [24] did evaluate the effects of inertia (not considering Cload) of the hydrokinetic turbine on its start-up dynamics and have reported that by considering lower values of turbine inertia, the start-up time of the turbine reduced significantly. The authors also found out that shorter start-up times lead to higher overshoot experienced by the turbine.…”

Section: Lift-based Vawtsmentioning

confidence: 99%

See 3 more Smart Citations

Start-up Dynamics of Vertical Axis Wind Turbines: A Review

Lough,

Asim,

Coull

et al. 2023

J. Phys.: Conf. Ser.

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Vertical Axis Wind Turbines (VAWTs) are becoming increasingly popular for wind power extraction due to their simpler design, lower manufacturing and maintenance costs. The omni-directionality of these power generating machines make them more suitable for operation both under lower wind speeds and highly transient winds. The key wind power extraction component of VAWTs is their rotor, which is conventionally either Drag-based or Lift-based, with the latter being more widely studied in the published literature due to its higher power coefficient compared to its counterpart. The lift-based rotor comprises of aerodynamically profiled blades, while the drag-based rotor comprises of thin cup-shaped blades. The start-up of both these types of VAWT rotors has been an area of active research in the last decade. These studies have been conducted using numerical and experimental methods focusing on key parameters related to the start-up dynamics of VAWTs. Many of these research studies complement each other’s findings, however, there are also a number of aspects where there are disagreements and/or significant knowledge gaps that need to be highlighted in order to accelerate scientific efforts strategically. In the present study, we aim to address these challenges through a thorough and critical review of the published literature on VAWTs’ start-up dynamics, leading towards the identification of key knowledge gaps.

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Section: Drag-based Rotorssupporting

confidence: 67%

Section: Lift-based Vawtsmentioning

confidence: 92%

Section: Lift-based Vawtsmentioning

confidence: 99%

Section: Lift-based Vawtsmentioning

confidence: 99%

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Start-up Dynamics of Vertical Axis Wind Turbines: A Review

Lough,

Asim,

Coull

et al. 2023

J. Phys.: Conf. Ser.

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“…The harnessing of renewable energy sources has emerged as a pivotal component of global efforts to mitigate climate change and ensure sustainable energy access [1][2][3]. Among the myriad renewable energy technologies, Vertical Axis Hydrokinetic Turbines (VAHKTs) [4][5][6][7] stand as a promising and innovative approach to tapping into the kinetic energy of water currents. These turbines exhibit unique advantages, such as lower maintenance requirements and suitability for installation in a wide range of water environments, making them a compelling choice for clean energy production.…”

Section: Introductionmentioning

confidence: 99%

Systematic Review of Computational Fluid Dynamics Modelling and Simulation Techniques Employed in Vertical Axis Hydrokinetic Turbines

Muhyiddin Mohammed,

Shamsul Sarip,

Sa’ardin Abdul Aziz

et al. 2024

ARAM

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At present, Computational Fluid Dynamics (CFD) is being utilized to explore tidal and hydrokinetic turbine systems, advancing comprehension of turbulent flow phenomena and raising the accuracy of performance predictions for these fluid-driven turbines. Consequently, this utilization of CFD contributes to the optimization of efficiency in these devices. Turbines are subject to variations from the best design point due to the influence of fluctuating flow rates, despite the findings of recent research that have identified the ideal design points. In contrast to conventional literature reviews, systematic analysis offers numerous advantages. The methodological strategy applied in this study entailed cross-referencing the findings obtained from Web of Science (WOS) and Scopus databases to establish the comprehensiveness as well as reliability of researcher data. Improving the review process, elevating the prominence of the field of study, and establishing critical priorities to mitigate research bias are all potential strategies for enhancing the quality of these evaluations. This research divides its findings into three core themes: (1) Performance assessment for practical implications, (2) Numerical analysis for theoretical insights, and (3) Design parameter optimization for engineering relevance. These themes collectively provide a well-rounded examination of the research outcomes across practical, theoretical, and engineering dimensions. Finally, the research findings have the potential to act as a significant point of reference for informing the best design considerations pertaining to vertical axis turbines.

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