Experimental Study on the Film Cooling Characteristics of the Cylindrical Holes Embedded in Sine-Wave Shaped Trench

Jiang, Wei; Zhu, Hui-ren; Liu, Cun-liang; Song, Hui; Liu, Cong; Meng, Tong

doi:10.1115/gt2016-56856

Cited by 17 publications

(11 citation statements)

References 16 publications

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“…32 Moreover, the research made use of simulated framework for surveying validation of result with experimental data conducted by. 11,31 The width of w-wave trench in all amplitudes is constant at 2.1 D. The trench depth (H) is 0.75 D, and the trench amplitude curves are 0.5 D, 1 D, and 1.5 D.…”

Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

“…An experimental investigation was conducted by Wei et al. 31 to analyze the film cooling effectiveness of sine-wave shape on the trailing edge of the trench. Their efforts led to improved cooling performance due to the broader spreading of coolant based on an anti-counter-rotating vortex pair (anti-CRVP), caused by their specific design of trench.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Geometry and Boundary Conditionsmentioning

confidence: 99%

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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“…The results [1,2] show that the improvement of film cooling effectiveness is mainly to restrain the development of the kidney vortex and reduce the normal penetration ability of cooling jet to the mainstream. In the novel film cooling schemes, researchers have designed combined-hole [3,4], antivortex hole [5,6], trench [7,8], and ridge-shaped tabs [9,10] to suppress the strength of the kidney vortex. However, with the development trend of gas turbines, the combustor outlet temperature continues to increase for higher recycling efficiency, and the single cooling method cannot fulfill the requirements.…”

Section: Introductionmentioning

confidence: 99%

Parametric Studies of Laminated Cooling Configurations: Overall Cooling Effectiveness

Wang

Zhang

2021

International Journal of Aerospace Engineering

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Combing the advantages of film cooling, impingement cooling, and enhanced cooling by pin fins, laminated cooling is attracting more and more attention. This study investigates the effects of geometric and thermodynamic parameters on overall cooling effectiveness of laminated configuration, and model experiments were carried out to validate the numerical results. It is found that the increases in film cooling hole diameter and pin fin diameter both result in the increase in cooling effectiveness, but the increases in impingement hole diameter, impingement height, and spanwise hole pitch degrade the cooling performance. The increase of the coolant flow rate causes the increase in cooling efficiency, but this effect becomes weaker at a high coolant flow rate. The coolant-to-mainstream density ratio has no obvious effect on cooling effectiveness but affects wall temperature obviously. Moreover, based on the numerical results, an empirical correlation is developed to predict the overall cooling efficiency in a specific range, and a genetic algorithm is applied to determine the empirical parameters. Compared with the numerical results, the mean prediction error (relative value) of the correlation can reach 8.3%.

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“…Oguntade (Oguntade et al, 2014) applied the shaped trench and found that the overall cooling effectiveness can be increased by 35%.Schreivoge (Schreivogel et al, 2014) (Schreivogel and Pfitzner, 2015) put forward some novel narrow segmented trench geometries, the results showed that the segmented trenches had a broader coolant coverage. Wei (Wei et al, 2016) investigate the sine-wave shaped trench which was obtained by changing the transverse trench, and analyzed the anti-kidney vortices generated, and concluded the sine-wave shaped trench has better cooling coverage and lower aerodynamic loss.…”

Section: Introductionmentioning

confidence: 99%

Multi-field coupling analysis on the film-cooling with transverse and arched trenches

Wang

Zhang

et al. 2019

JTST

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In this study, the properties of the flat-plate film-cooling with transverse and arched trenches are investigated. The conjugate temperature field and thermal stress field were both predicted by the multi-field coupling method. In addition, the transverse trench configuration was investigated and compared as the benchmark case. The results show that the blockage effect formed by the arched trench is helpful to improve the coolant lateral coverage and thus the cooling performance. Meanwhile, the thermal stress concentration may be stronger due to the higher temperature gradient for the arched trench configuration. The distance between the downstream trench edges and the holes is of great importance to the cooling performance. The closer this distance, the more conductive to the blockage effect and the lateral coverage, which is helpful to improve the cooling performance. The distance between the upstream trench edges and the holes shows less impact on the cooling performance. Compared with the non-trench film cooling, the trenched models can form higher temperature gradient, so the thermal expansion near the film hole is more different from that in other region, which tend to form stronger stress concentration near the film hole. Compared with the transverse trench, the arched trench can deliver the coolant jet from the center line to the lateral side, which is helpful to form laterally coverage in the downstream region, especially under the higher blowing ratio. So the arched trench can form lower temperature gradient and relative uniform thermal expansion, which is helpful to decrease the stress concentration around the cooling hole.

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Experimental Study on the Film Cooling Characteristics of the Cylindrical Holes Embedded in Sine-Wave Shaped Trench

Cited by 17 publications

References 16 publications

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

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

Parametric Studies of Laminated Cooling Configurations: Overall Cooling Effectiveness

Multi-field coupling analysis on the film-cooling with transverse and arched trenches

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