Improving ambient wind environments of a cross-flow wind turbine near a structure by using an Inlet Guide Structure and a Flow Deflector

Tanino, Tadakazu; Nakao, Shinichiro; Uebayashi, Genki

doi:10.1007/s11630-005-0008-0

Cited by 7 publications

(7 citation statements)

References 1 publication

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“…Considering three-dimensional and non-periodic nature of the concept and the need to model external air volume, a good preliminary design or the investigation of effect of parameters by simulations is highly challenging. To reduce the problem to a more manageable level, an existing cross-flow wind turbine (an alternative type of VAWTs) bare rotor with 12 blades, 115 mm outer diameter, 125 mm axial length and 20 mm chord length, 32,41 which can be converted to an RWT by including external casing, is selected as a baseline. Moreover, the selected bare rotor has experimental data which can be used for code validation purposes.…”

Section: Methodsmentioning

confidence: 99%

“…The described numerical simulation methodologies, most prominently embedded empirically derived RANS turbulent closure model (SST) including γ-Re θ laminar-turbulent transition submodel, must be validated against experimental data of a representative (similar flow conditions) case. The utilized bare rotor without outer casing can be used for this purpose since it operates at the same Re chord (=11 × 10 3 ) 32 with the RWT investigated in this study. Even if this is a three-dimensional simulation, the optimal mesh size of the previous section is used for the simulations with 1% error due to discretization (which is also justified by a three-dimensional mesh dependency).…”

Section: Theory and Calculationsmentioning

confidence: 99%

“…3–11 Quantitatively, number of journal citations to VAWTs has increased from 14 in 2006 to 1600 in 2016 and the number of published articles has increased by a similar factor. 12 In order to address the drawbacks and enhance performance, various techniques such as design and shape optimizations, 13–15 active or passive flow control techniques, 16–26 variable-pitch blades, 27,28 inclusion of additional flow deflectors or casings 29–33 and power enhancement via paired or farm configurations 34–38 are recently being investigated in detail for several different types (both lift and drag based) of VAWTs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of radial turbines for wind energy harvesting

Gürbüz

İlhan²,

Acarer

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Wind energy has been a research focus of the last few decades, promoting the topic to a much more matured level. However, the body of literature is built around a limited number of turbine types and it is still beneficial to increase turbine diversity for the opportunity to select optimal turbine for a given purpose. The radial (inflow) turbines known in gas and hydro turbine industries for pressurized pipe flows are undiscovered turbines for free-stream wind harvesting both in air and underwater. In such case, the wind tangentially interacts with each blade by an external casing; therefore, all blade angular positions may, at least in theory, contribute equally to power production. Enclosed compact architecture with low rotational speeds and narrow intake ports may possess advantages in enabling the use of much weaker but more recyclable and long-lasting blades and in applications such as integrated wind harvesting for blunt bodies like buildings, vessels and devices or for any application where an open rotor is not feasible. Using experimentally validated Reynolds-averaged Navier–Stokes simulations, mass swallowing capacities and corresponding efficiencies of such turbines are parametrically investigated at low Reynolds numbers, Re chord=11 × 103, and finally enhancement is shown in 88 × 103. Findings provide first insights into such turbines. Considering the investigated very low Reynolds numbers and three-dimensional effects, comparable performance with other small turbines are observed. Moreover, undiscovered potential for performance optimization persists.

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Section: Methodsmentioning

confidence: 99%

Section: Theory and Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of radial turbines for wind energy harvesting

Gürbüz

İlhan²,

Acarer

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…CFWT performance can also be improved by using a vane at the beginning of the turbine to steer the wind and prevent it from hitting the convex part of the rotor blades. As illustrated in Figure 19a, Tanino et al [136] enhanced 30% of the CFWT performance by using a deflector and an Inlet Guide Vane (GV). The deflector was set near a CFWT, and an inlet GV was placed on the structure's edge, improving the wind flow inside the WT.…”

Section: Guide Vanementioning

confidence: 99%

“…In short, the C P increased by 84.3% compared to the CFWT without GV. As illustrated in Figure 19a, Tanino et al [136] enhanced 30% of the CFWT performance by using a deflector and an Inlet Guide Vane (GV). The deflector was set near a CFWT, and an inlet GV was placed on the structure's edge, improving the wind flow inside the WT.…”

Section: Guide Vanementioning

confidence: 99%

A Comprehensive Review on Development and Applications of Cross-Flow Wind Turbines

2023

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The rapid globalization of the energy crisis and the adverse effects of global warming have caused the need for non-conventional energy resources to be felt more than ever. As a result of this, vertical axis wind turbines (VAWT) have received much attention over the recent decades, and have thus been more developed and used worldwide. The cross-flow wind turbine (CFWT) is a wind turbine in the category of VAWTs, and perfectly suitable for urban applications due to its simplicity, high starting torque at low wind speed, and self-starting capability, even though its low power coefficient as its main drawback has slowed down its widespread use so far. The main aim of this paper is to review the scientific literature and recent developments in the field of CFWTs. The governing equations and turbulence models for the simulation of the turbine are discussed and various wind resource assessment methods for estimating potential site locations, different aspects, and wind energy harvesting systems from buildings are debated. The research gaps, challenges, and future possible works on such turbines and their applications are discussed. Investigations indicate that changing the rotor geometric parameters and adding innovative augmentation devices have been the most widely addressed approaches for making performance enhancement of the wind turbine in the literature. The critical performance-affecting parameters are improved by various innovative designs of the turbine structure or blades, as well as several augmentation techniques, such as guide nozzle, casing, windshield, guide vane, deflector, cowling, etc.

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