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

Prasert Prapamonthon, Huazhao Xu, Wenshuo Yang and Jianhua Wang
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Prasert Prapamonthon: Department of Thermal Science & Energy Engineering, School of Engineering Science, University of Science and Technology of China, Hefei 230027, China
Huazhao Xu: Department of Thermal Science & Energy Engineering, School of Engineering Science, University of Science and Technology of China, Hefei 230027, China
Wenshuo Yang: Department of Thermal Science & Energy Engineering, School of Engineering Science, University of Science and Technology of China, Hefei 230027, China
Jianhua Wang: Department of Thermal Science & Energy Engineering, School of Engineering Science, University of Science and Technology of China, Hefei 230027, China

Energies, 2017, vol. 10, issue 3, 1-16

Abstract: This work presents a numerical investigation of the combined effects of thermal barrier coating (TBC) with mainstream turbulence intensity ( Tu ) on a modified vane of the real film-cooled nozzle guide vane (NGV) reported by Timko (NASA CR-168289). Using a 3D conjugate heat transfer (CHT) analysis, the NGVs with and without TBC are simulated at three Tus ( Tu = 3.3%, 10% and 20%). The overall cooling effectiveness, TBC effectiveness and heat transfer coefficient are analyzed and discussed. The results indicate the following three interesting phenomena: (1) TBC on the pressure side (PS) is more effective than that on the suction side (SS) due to a fewer number of film holes on the SS; (2) for all three Tus , the variation trends of the overall cooling effectiveness are similar, and TBC plays the positive and negative roles in heat flux at the same time, and significantly increases the overall cooling effectiveness in regions cooled ineffectively by cooling air; (3) when Tu increases, the TBC effect is more significant, for example, at the highest Tu ( Tu = 20%) the overall cooling effectiveness can increase as much as 24% in the film cooling ineffective regions, but near the trailing edge (TE) and the exits and downstream of film holes on the SS, this phenomenon is slight.

Keywords: thermal barrier coating; overall cooling effectiveness; nozzle guide vane (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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