Novel Flow Control Method for Vortex Shedding of Turbine Blade

Elgendi, Mahmoud; Ibrahim, M.K.; Mori, Koichi; Nakamura, Yoshiaki

doi:10.2322/tjsass.53.122

Cited by 11 publications

(17 citation statements)

References 30 publications

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“…The numerical results or solutions of the fluid flow's governing equations using computers are referred to as CFD. CFD is a vital technique to simulate the flow around blowers [23], gas turbines [24], and wind turbines [25]. In addition, CFD can simulate natural convection flow precisely [26].…”

Section: Validate Bem Methods Against Cfdmentioning

confidence: 99%

Review on validation techniques of blade element momentum method implemented in wind turbines

Abdelkhalig

Elgendi

Selim

2022

IOP Conf. Ser.: Earth Environ. Sci.

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There are two broad kinds of energy sources: renewable and non-renewable. In the renewable energy sector, significant advancements have been made in wind energy, the world’s fastest-growing renewable energy production technology. Despite this rapid development, the wind industry must still strive to ensure that any device designed for commercial use is reliable and its performance satisfies its economic projections. The critical factor in achieving this target is rotor aerodynamics because the rotor is the part that mainly reacts with the wind. When designing a wind turbine, the assessment of the aerodynamic characteristics of the blades must be accurate. Errors may result in wrong estimates of the turbines’ performance and economic projections. If experimental measurements cannot determine these characteristics, a designer will use alternative methods. Several modeling methods have proven viable solutions for design and analysis purposes, like Blade Element Momentum (BEM) methods. BEM methods analyze the aerodynamic performance of wind turbines, but it requires validation to examine the accuracy of its results. This paper highlights and reviews BEM validation techniques implemented in wind turbine aerodynamics analyses. BEM is validated against experimental data and other advanced models, namely, higher-order vortex and CFD (Computational Fluid Dynamics) models. Nevertheless, the experimental data are essential in wind turbine studies for both understanding the aerodynamic mechanisms and validating all these models.

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Section: Validate Bem Methods Against Cfdmentioning

confidence: 99%

Review on validation techniques of blade element momentum method implemented in wind turbines

Abdelkhalig

Elgendi

Selim

2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…In this paper, the result for making a hole with an inclination angle of 30 degrees between the pressure side and suction side at the trailing area has been presented. This connection may create a phenomenon of blowing and suction between both sides as agreed by [10]. A suction slot on the blade can reduce the total pressure loss while the blowing phenomenon can improve the pressure distribution on the blade [11,12].…”

Section: Introductionmentioning

confidence: 99%

Vortex Suppression on High Subsonic Turbine Blade via Micro Holes (30 Degree)

Noh¹,

Moris²

2022

JMechE

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The vortex shedding of a turbine blade is suppressed by making a hole, connecting between the pressure side and suction side in the area of the trailing edge. Computational simulation has been done via numerical code by using Spalart–Allmaras turbulence model with Delayed Detached Eddy Simulation. The exit Reynolds number is 2.8 × 106 and the exit isentropic Mach number is 0.79. The size of the hole is 0.094D with a connecting angle of 30 degrees. The result shows that the vortex has successfully been suppressed at the turbine trailing edge and turbine wake area. The micro-hole is capable to reduce initial vortex formation which can be confirmed by the decrement of frequency peak and via observation of flow field vortex simulation.

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“…On the other hand, elliptic trailing is found to be able to delay the separation of the boundary layer and reduce the loss caused by vortex shedding (El-Gendi et al, 2013). El-Gendi et al (2010) use the equidistant microtubes that connect the suction side and pressure side at the beginning of the trailing edge to control the wake. They find that the microtubes can reduce the blade profile loss by 3%.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Biomimetic Trailing Edge of a Turbine Blade Under a Wide Range of Outlet Mach Numbers

et al. 2021

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This study was carried out to investigate the loss mechanism of a blade with a harbor seal whisker structure on the trailing edge under different Mach numbers. The loss of high-pressure turbine blades with four different trailing edge geometries, including a prototype, an elliptical trailing edge (ETE), a sinusoidal trailing edge (STE), and a biomimetic trailing edge (BTE) at Mach numbers of 0.38–1.21 is studied. The delayed detached-eddy simulation method is used to predict the detailed flow of the four cascades. The result shows that, when the Mach number is less than 0.9, the BTE can effectively reduce the energy loss coefficient compared with the other three cases. As the Mach number increases, the three-dimensional characteristics of the wake behind the BTE weaken. The energy loss coefficient of the blade with the BTE is close to that of the blade with the ETE and STE when the Mach number is greater than 0.9. Besides this, by controlling the wake, the BTE can effectively suppress the dynamic movement of shock waves in the cascade at high Mach numbers.

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Novel Flow Control Method for Vortex Shedding of Turbine Blade

Cited by 11 publications

References 30 publications

Review on validation techniques of blade element momentum method implemented in wind turbines

Review on validation techniques of blade element momentum method implemented in wind turbines

Vortex Suppression on High Subsonic Turbine Blade via Micro Holes (30 Degree)

Numerical Study on the Biomimetic Trailing Edge of a Turbine Blade Under a Wide Range of Outlet Mach Numbers

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