A Comparison of CFD and Lda Studies of Internal Vortex Cooling Systems for Turbine Blades

Alajmi, R.; Syred, N.; Bowen, Philip John; Халатов, А. А.; Al-Shaghdari, Mohammed A.

doi:10.1615/jflowvisimageproc.v5.i3.20

Cited by 2 publications

(3 citation statements)

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“…The numerical validation was conducted on the same experimental geometry as used in [23] , as presented in Figure 1. The proposed vortex chamber had an opposite stream for the inlet and outlet.…”

Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

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Numerical investigation on heat transfer performance and flow characteristics in a roughened vortex chamber

Alhajeri

Almutairi

Alenezi

et al. 2019

Applied Thermal Engineering

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In this study, an investigation of a vortex chamber was carried out to gain a full understanding of the nature of the vortex flow and the cooling capability inside the chamber. The paper discusses the effects on flow and heat transfer rates when the inside surface of the vortex chamber was roughened by adding flow turbulators to its wall. The turbulators took the shape of a rib with a square cross-section, the dimension of which varied between 0.25 mm and 2.00 mm. The paper also presents the results of a comparative investigation of jet impingement and vortex cooling on a concave wall using different parameters, such as the total pressure loss coefficient, Nusselt number and thermal performance factor, to evaluate the cooling effectiveness and flow dynamics. Furthermore, the entropy generation in swirl flow with the roughened wall was assessed over a wide range of Reynolds numbers.The results show that surface roughness considerably influences the velocity distribution, heat transfer patterns and pressure drop in the vortex chamber. The highest thermal performance factor takes place at rib heights of 0.25 mm and 0.50 mm with a low Re number. Further increase in rib height has an adverse impact on thermal performance. At a Reynolds number lower than 50000, it is highly recommended to use roughened vortex cooling to obtain the best thermal performance.

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Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

“…A comparison of studies by CFD and laser Doppler anemometry (LDA) of the inside of a vortex chamber of a turbine blade was carried out by [23]. The research focused on the inlet to outlet ratio and its effect on chamber flow.…”

mentioning

confidence: 99%

Numerical investigation on heat transfer performance and flow characteristics in a roughened vortex chamber

Alhajeri

Almutairi

Alenezi

et al. 2019

Applied Thermal Engineering

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“…Hence, although the isotropy assumption might lead to an intuition that turbulence viscosity predictions should not be accurate, extensive numerical investigations utilizing these models have yielded successful predictions of complex flows. Examples on the success of eddy viscosity models in predicting different types of vorticity-dominated flow and flow with streamline curvature can be found in [179][180][181][182][183][184][185][186][187][188][189][190]. LES [191] provides an alternative approach in which the large eddies are computed in a time-dependent simulation that uses a set of filtered equations.…”

Section: Turbulent Viscosity Modelsmentioning

confidence: 99%

Wells turbine for wave energy conversion: a review

Shehata

Xiao

Saqr

et al. 2016

Int. J. Energy Res.

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Summary In the past 20 years, the use of wave energy systems has significantly increased, generally depending on the oscillating water column concept. Wells turbine is one of the most efficient oscillating water column technologies. This article provides an updated and a comprehensive account of the state‐of‐the‐art research on Wells turbine. Hence, it draws a roadmap for the contemporary challenges, which may hinder future reliance on such systems in the renewable energy sector. In particular, the article is concerned with the research directions and methodologies, which aim at enhancing the performance and efficiency of Wells turbine. The article also provides a thorough discussion of the use of CFD for performance modeling and design optimization of Wells turbine. It is found that a numerical model using the CFD code can be employed successfully to calculate the performance characteristics of W‐T as well as other experimental and analytical methods. The increase of research papers about CFD, especially in the last 5 years, indicates that there is a trend that considerably depends on the CFD method. Copyright © 2016 John Wiley & Sons, Ltd.

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A Comparison of CFD and Lda Studies of Internal Vortex Cooling Systems for Turbine Blades

Cited by 2 publications

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Numerical investigation on heat transfer performance and flow characteristics in a roughened vortex chamber

Numerical investigation on heat transfer performance and flow characteristics in a roughened vortex chamber

Wells turbine for wave energy conversion: a review

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