Numerical evaluation on single-row trenched-hole film cooling performances on turbine guide vane under engine-representative conditions

Ke-nan, Huang; Zhang, Jingzhou; Wang, Chunhua; Shan, Yongkui

doi:10.1080/10407782.2019.1627830

Cited by 14 publications

(4 citation statements)

References 33 publications

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“…In this model, it is assumed that the network is in a stable state. In the next step, the model developed by the software and data of the gas transmission network in Iran was solved [18,19].…”

Section: Resultsmentioning

confidence: 99%

Optimizing Fluid Flow Cooling in Gas Transmission Systems

Widjaja¹,

Al-Thamir²,

Mehran³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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In this study, structural theory was used to examine the geometric configuration of channels embedded inside an object in the presence of internal heat generation for cooling by a heat transfer mechanism. The growth and development of gas transmission lines and the lack of up-to-date integrated information systems have made the design and maintenance of pipelines, as well as the handling of problems caused by various accidents in the pipeline, very complex in many cases. Using accurate descriptive and spatial information in tolls on gas transmission line maps such as pipes, booster stations, valves, and forks in a spatial reference database can engage planners, operators, and paramedics in a variety of management. They are used to help in the direction of optimal and purposeful management. Therefore, in this paper, by considering appropriate laboratory conditions and numerical experiments and calculations, it is possible to determine the optimal attraction of duct holes for cooling components of the gas transmission system, so that the industry can produce and developed gas transmission without incident. In this study, in addition to studying the geometric characteristics of channel spacing and their length, the dimensions of a specific channel for reducing the maximum produced temperature are also discussed

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Section: Resultsmentioning

confidence: 99%

Optimizing Fluid Flow Cooling in Gas Transmission Systems

Widjaja¹,

Al-Thamir²,

Mehran³

et al. 2022

Fluid Dynamics &Amp; Materials Processing

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“…The finite volume method is adopted to solve three-dimensional Reynolds averaged Navier-strokes (RANS) equations in this study. Two-equation turbulence models, including the realizable 30–33 and standard 21,34 k-ɛ model, for the numerical solution of Navier-Stokes equations in film cooling simulation are employed, in order to validate the computational data with the experimental results.…”

Section: Computational Approachmentioning

confidence: 99%

“…In another research, Huang et al. 30 studied a turbine guide vane consisting of conventional transverse trench, serrated and baseline case at the suction and pressure side of the turbine blade that improved the distribution of temperature and cooling effectiveness on each side. They pointed to the effective destruction of kidney vortices on the suction side of vane by two pairs of vortices forming at the edge of the trench that rotated in the opposite direction to the kidney-vortex pair, as well as the significantly improved effectiveness of the serrated trench than the straight one on the suction surface.…”

Section: Introductionmentioning

confidence: 99%

On the effect of geometry of w-wave trenches on film cooling performance of gas turbine blades

Bahambari

Kayhani

Norouzi

2021

Proceedings of the Institution of Mechanical Engineers, Part A:

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In the present study, three types of w-wave trenches with different amplitude configurations are compared with transverse trench (TT), and the use of variable radius fillet (VRF) on downstream lips at different blowing ratio is numerically investigated to measure heat transfer coefficient, and cooling effectiveness. The numerical results are obtained by three-dimensional Reynolds average Navier–Stokes equations (RANS) while employing shear stress transport turbulence models, which are validated by comparing with experimental data. The trench width is kept constant in all cases, yet the three different amplitudes and variable fillet radiuses offered a variety of designs in trench film cooling. The results showed that w-wave trenches impressively improved film cooling effectiveness over the transverse trench, and utilizing fillets at downstream lips of the trench caused significant enhancement on both lateral averaged and centerline cooling performance. Due to the w-wave trench configuration, anti-counter-rotating vortices responsible for pushing coolant film toward the near-wall were formed throughout of downstream wall of the trench, and the cooling flow thus had a more uniform structure. The heat transfer coefficient distributions of filleted w-wave trenches are observed to be more uniform than simple w-wave and transverse trench under all blowing ratio conditions. Moreover, enlargement of the fillet radius in Cases 2 and 3 yielded to the growth of centerline coolant flow, which in turn resulted in the improvement of film cooling effectiveness at all blowing ratios.

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“…From the above, endwall film cooling plays an important role in protecting the endwall and vane-endwall junction region. However, two regions on the endwall are difficult for application of film cooling due to the complex flow field, i.e., leading edge (LE) region [35,36] and endwall-PS junction region. Sundaram and Thole [37,38] investigated the film cooling at the LE of a NGV with trenched holes or bump modifications aiming at controlling the film cooling flow field.…”

Section: Two Rows Of Film Cooling Holesmentioning

confidence: 99%

Endwall film cooling holes design upstream of the leading edge of a turbine vane

Liu

Hussain

et al. 2020

Numerical Heat Transfer, Part A: Applications

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Endwall film cooling upstream of the leading edge (LE) of a vane presents a relatively complex flow phenomenon due to the horseshoe vortices (HVs) generated at the LE region. Upstream of the LE region, the coolant flow has difficulties to eject out. This research work focuses on controlling the jet holes coolant coverage upstream of the LE region. Compound angle holes in staggered arrangement are introduced and applied in the LE region to increase the coolant coverage. Six different arrangements of cooling holes are designed, with variations from one row or two rows arrangements, parallel or staggered arrangements, normal cylindrical holes or compound angle holes. Besides cooling holes with different shapes and arrangements, effect of the blowing ratio (BR) and turbulence intensity (TI) are also considered. The BR ranges from 1 to 3 and TI ranges from 1.3% to 15%. The calculated results show that the film cooling holes upstream of the LE of a vane have significant cooling effects on both the vane surfaces and the endwall. At small BRs, the film cooling effectiveness (g) on the endwall is considerable. When the BR is increased, the g on the vane surfaces is increased more quickly and becomes dominant. The coolant coverage in the vane-endwall junction region are not affected by the mainstream turbulence intensity and almost keep the same with the varied turbulence intensities. A single row of cylindrical holes (Case 1) and two rows of compound angle holes with staggered arrangement (Case 5) have relatively high overall averaged cooling effectiveness compared with other cases at different BRs. In addition, the high averaged cooling effectiveness on the endwall and vane surfaces by Case 5 is not affected by a change of the BRs.

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Numerical evaluation on single-row trenched-hole film cooling performances on turbine guide vane under engine-representative conditions

Cited by 14 publications

References 33 publications

Optimizing Fluid Flow Cooling in Gas Transmission Systems

Optimizing Fluid Flow Cooling in Gas Transmission Systems

On the effect of geometry of w-wave trenches on film cooling performance of gas turbine blades

Endwall film cooling holes design upstream of the leading edge of a turbine vane

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