Numerical Study of the Effects of Thermal Barrier Coating and Turbulence Intensity on Cooling Performances of a Nozzle Guide Vane

Prapamonthon, Prasert; Xu, Huazhao; Yang, Wenshuo; Wang, Jianhua

doi:10.3390/en10030362

Cited by 17 publications

(14 citation statements)

References 28 publications

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“…Moreover, the six-point temperatures on the vane surface are monitored until the larger changes of these parameters disappear with subsequent iterations. As per previous works done by Prapamonthon [30,31], it is expected that the converged solutions are obtained after 17,000-18,000 iterations. With CHT analysis, the Navier-Stokes equations and equation of energy are solved within the fluid domain, whereas the heat conductive equation by Fourier's law is only solved in the solid domain under a suitable thermal conductive effect to associate the calculation of heat flux.…”

Section: Techniques Of Calculationsupporting

confidence: 58%

“…The evaluation method of four thermal parameters which relate to temperatures on the metal surface with and without TBC is demonstrated in Figure 1, as established by Prapamonthon et al [31]. The presence of a bond coat is neglected by a simplified assumption that it is a part of the vane surface with a relatively thin thickness.…”

Section: Thermal Parametersmentioning

confidence: 99%

“…Figure 1. Evaluation of the thermal parameters used in this work [31]. TBC: thermal barrier coating.…”

Section: Thermal Parametersmentioning

confidence: 99%

“…For the film-cooled vane with round holes, overall effectiveness was increased significantly by TBC, and the effect of the blowing ratio on the overall cooling effectiveness of the turbine vane with TBC was minimal. Prapamonthon et al [30,31] simultaneously studied the effects of Tu and TBC on the cooling performance of a leading-edge cooling guide vane and a real film-cooled vane, using 3D CHT analysis at Tu = 3.3%, 10%, and 20%. Their works indicated that TBC was more effective when the level of Tu increased.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Cooling Performances of a Non-Film-Cooled Turbine Vane Coated with a Thermal Barrier Coating Using Conjugate Heat Transfer

et al. 2018

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Abstract:The aim of this paper is to numerically investigate cooling performances of a non-film-cooled turbine vane coated with a thermal barrier coating (TBC) at two turbulence intensities (Tu = 8.3% and 16.6%). Computational fluid dynamics (CFD) with conjugate heat transfer (CHT) analysis is used to predict the surface heat transfer coefficient, overall and TBC effectiveness, as well as internal and average temperatures under a condition of a NASA report provided by Hylton et al. [NASA CR-168015]. The following interesting phenomena are observed: (1) At each Tu, the TBC slightly dampens the heat transfer coefficient in general, and results in the quantitative increment of overall cooling effectiveness about 16-20%, but about 8% at the trailing edge (TE). (2) The protective ability of the TBC increases with Tu in many regions, that is, the leading edge (LE) and its neighborhoods on the suction side (SS), as well as the region from the LE to the front of the TE on the pressure side (PS), because the TBC causes the lower enhancement of the heat transfer coefficient in general at the higher Tu. (3) Considering the internal and average temperatures of the vane coated with two different TBCs, although the vane with the lower thermal conductivity protects more effectively, its role in the TE region reduces more significantly. (4) For both TBCs, the increment of Tu has a relatively small effect on the reduction of the average temperature of the vane.

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Section: Techniques Of Calculationsupporting

confidence: 58%

Section: Thermal Parametersmentioning

confidence: 99%

“…Figure 1. Evaluation of the thermal parameters used in this work [31]. TBC: thermal barrier coating.…”

Section: Thermal Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of Cooling Performances of a Non-Film-Cooled Turbine Vane Coated with a Thermal Barrier Coating Using Conjugate Heat Transfer

et al. 2018

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“…The vane model is the transonic film-cooled guide vane which is modified from [Timko (1984)]. This modified vane and its linear cascade are the same model as previously studied by [Prapamonthon, Xu, Yang et al (2017)]. The vane height is 40 mm with a constant cross-section area.…”

Section: Vane Modelmentioning

confidence: 99%

CHT/CFD Analysis of Thermal Sensitivity of a Transonic Film-Cooled Guide Vane

Prapamonthon¹,

Yooyen²,

Sleesongsom³

2019

Computer Modeling in Engineering &Amp; Sciences

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Thermal parameters are important variables that have great influence on life time of turbine vanes. Therefore, accurate prediction of the thermal parameters is essential. In this study, a numerical approach for conjugate heat transfer (CHT) and computational fluid dynamics (CFD) is used to investigate thermal sensitivity of a transonic guide vane which is fully film-cooled by 199 film holes. Thermal barrier coating (TBC), i.e., the typical TBC and a new one as the candidate TBC, and turbulence intensity (Tu), i.e., Tu=3.3%, 10% and 20%, are two variables used for the present study. At first the external surface temperatures of the vane material are compared. Next, the TBC surface temperatures are considered. Results show the major role of the lower thermal conductivity of TBC which results in the lower and more uniform temperature on the external surface of the vane substrate. Finally, the thermal sensitivity is presented in terms of the percentage reduction of the external surface temperatures of the vane material and the structural temperatures of the vane material at midspan, including the variations of average and maximum vane temperatures. Results show that TBC and Tu have significant effects on the external surface and structural temperatures of the vane substrate. The lower thermal conductivity of TBC leads to the higher difference between the thermal conductivity of the vane substrate and TBC, the reduction of heat transfer and the more uniform temperature within the vane structure. The results also show more effective protection for the average vane temperature from the two TBCs at higher Tus. However, Tu does not significantly affect the reduction of the maximum vane temperature even though the new TBC, which has the very low thermal conductivity, is used.

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