Effects of Crossflow in an Internal-Cooling Channel on Film Cooling of a Flat Plate Through Compound-Angle Holes

Stratton, Zachary; Shih, Tsan‐Hsing; Laskowski, Gregory M.; Barr, Brian; Briggs, Robert

doi:10.1115/gt2015-42771

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…Zhang et al [11] experimentally studied the effects of vortex generator height (H/D) and location (L/D) on the film cooling effectiveness of flat plate, and found that the vortex generator contributes to enhancing film cooling effect. and Stratton et al [14] studied the effect of the direction of internal crossflow on the film cooling effectiveness of two perpendicular flat plate channels connected by a row of different shaped film holes by experimental method and CFD simulations, and found that LES is able to predict adiabatic film cooling effectiveness with reasonable accuracy. The above research shows that film cooling technology has been extensively studied, but the influence of the internal cooling structure of the internal cooling channel on the film cooling efficiency is neglected, so that the film cooling characteristics are underestimated or overvalued.…”

Section: Introductionmentioning

confidence: 99%

Conjugate Flow and Heat Transfer Mechanism between the Rib Cooling and Film Cooling

Jin¹,

Peng²,

Wu³

et al. 2022

Proceedings of Global Power &Amp; Propulsion Society

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Rib cooling and film cooling are the effective cooling schemes to meet the increasing demands of rising turbine inlet temperatures in modern gas turbine engines. Most studies have been carried out to find the flow and heat transfer characteristic of rib cooling or film cooling individually. While the conjugate heat transfer between these two cooling methods is rarely studied in the literature. In order to evaluate the interplay between the rib cooling and film cooling, the conjugate flow and heat transfer mechanism in two perpendicular flat plate channels connected by a conductive solid wall with a compound film hole through it is studied numerically. Ribs are arranged in the internal cooling channel and the heat conduction in the connecting wall and ribs are considered. The blowing ratios vary from 0.75 to 1.5. SST κ-ω and large-eddy simulation (LES) turbulence model are checked to find the applicability of the turbulence models in this simulation by comparing the numerically predicted results with the experimental results from literature. The results indicate that LES is better at capturing the fine structure of the flow field and has higher accuracy. The arrangement of film hole strengthens the heat transfer capacity of the internal cooling channel. However, the arrangement of ribs reduces the overall cooling efficiency of the mainstream cooling channel.

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Section: Introductionmentioning

confidence: 99%

Conjugate Flow and Heat Transfer Mechanism between the Rib Cooling and Film Cooling

Jin¹,

Peng²,

Wu³

et al. 2022

Proceedings of Global Power &Amp; Propulsion Society

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show abstract

“…Acharya's research (Acharya, 2013) found that the best film effectiveness could be obtained by making the cooling flow direction consistent with main flow. Stratton (Stratton, 2014) investigated the effect of coolant flow orientation on the film effectiveness of compound-angle hole. The study compared the performance of SST model, k-ε model and large eddy simulation on reproducing the nature of flow in film hole and conclude that large eddy simulation could capture the detail of flow and unsteady phenomenon correctly.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Impingement-Effusion Cooling Structure on Adiabatic Film Effectiveness

Wang¹,

Li²,

Ren³

2022

Proceedings of Global Power &Amp; Propulsion Society

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Double wall cooling system for the vane is the most promising approach to meet the cooling demand of next generation turbine. The complex structure and heat and mass transfer process make many problems in double wall cooling unclear, which limits the development of double wall cooling in application. In this paper, the effect of impingement-effusion cooling structure on adiabatic film effectiveness is investigated numerically with two models, effusion film cooling-only and impingement-effusion cooling. Results show that the film effectiveness is not sensitive to the mass flow distribution of different rows of film hole and the effect of impingement structure on film effectiveness is very limited. It is therefore indicated that the film effectiveness of double wall cooling could be decoupled with complex heat transfer. It means the effect of impingement structure on adiabatic film effectiveness could be ignored when developing overall cooling models.

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“…They reported that a higher effectiveness was obtained for the cross-flow directed counter to the spanwise direction of the hole than for the cross-flow directed to the spanwise direction of the hole. Stratton et al [28] investigated the effects of the internal cross-flow on the film cooling performance for a cylindrical hole with a compound angle of 45 • by using RANS models and LES. They found that unsteady vortical structures were formed inside the hole and RANS results did not show a good match to an experimental data while LES predicted the film cooling effectiveness with reasonable accuracy.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Film Cooling Involving Compound Angle Holes: Comparative Study of LES and RANS

Baek

Ahn

2021

Processes

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A large eddy simulation (LES) was performed for film cooling in the gas turbine blade involving spanwise injection angles (orientation angles). For a streamwise coolant injection angle (inclination angle) of 35°, the effects of the orientation angle were compared considering a simple angle of 0° and 30°. Two ratios of the coolant to main flow mass flux (blowing ratio) of 0.5 and 1.0 were considered and the experimental conditions of Jung and Lee (2000) were adopted for the geometry and flow conditions. Moreover, a Reynolds averaged Navier–Stokes simulation (RANS) was performed to understand the characteristics of the turbulence models compared to those in the LES and experiments. In the RANS, three turbulence models were compared, namely, the realizable k-ε, k-ω shear stress transport, and Reynolds stress models. The temperature field and flow fields predicted through the RANS were similar to those obtained through the experiment and LES. Nevertheless, at a simple angle, the point at which the counter-rotating vortex pair (CRVP) collided on the wall and rose was different from that in the experiment and LES. Under the compound angle, the point at which the CRVP changed to a single vortex was different from that in the LES. The adiabatic film cooling effectiveness could not be accurately determined through the RANS but was well reflected by the LES, even under the compound angle. The reattachment of the injectant at a blowing ratio of 1.0 was better predicted by the RANS at the compound angle than at the simple angle. The temperature fluctuation was predicted to decrease slightly when the injectant was supplied at a compound angle.

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Effects of Crossflow in an Internal-Cooling Channel on Film Cooling of a Flat Plate Through Compound-Angle Holes

Cited by 11 publications

References 6 publications

Conjugate Flow and Heat Transfer Mechanism between the Rib Cooling and Film Cooling

Conjugate Flow and Heat Transfer Mechanism between the Rib Cooling and Film Cooling

The Effect of Impingement-Effusion Cooling Structure on Adiabatic Film Effectiveness

Large Eddy Simulation of Film Cooling Involving Compound Angle Holes: Comparative Study of LES and RANS

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