Numerical Investigation on Flow and Cooling Characteristics of a Micro-Ribbed Vane Endwall

DU Kun, CHEN Qihao, LI Yang, SUNDEN Bengt, LIU Cunliang, LI Wei

doi:10.1007/s11630-023-1769-z

Journal of Thermal Science >

2023 , Vol. 32 >Issue 2: 786 - 799

DOI: https://doi.org/10.1007/s11630-023-1769-z

Numerical Investigation on Flow and Cooling Characteristics of a Micro-Ribbed Vane Endwall

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1. School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China
2. Yangtze River Delta Research Institute of NPU, Northwestern Polytechnical University, Taicang 215400, China
3. Shaanxi Key Laboratory of Thermal Sciences in Aero-Engine System, Northwestern Polytechnical University, Xi’an 710129, China
4. NPU-KAI International Joint Laboratory of Advanced Aero-Engine Thermal Structure, Northwestern Polytechnical University, Xi’an 710129, China
5. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China
6. Department of Energy Sciences, Lund University, Lund SE-22 100, Sweden

Online published: 2023-11-28

Supported by

The authors gratefully acknowledge the support of National Natural Science Foundation of China (No. 52006178), National Key R&D Program of China (No. Y2019-VIII-0007-0168), the Fundamental Research Funds for the Central Universities and the Innovation Capacity Support Plan in Shaanxi Province of China (Grant No. 2023-CX-TD-19), the Swedish Research Council (VR) and the Swedish National Energy Agency (EM).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

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Abstract

The secondary flow originated from the inherent pressure gradient inside the vane cascade has a strong impact on the endwall cooling performance as the crossflow sweeps the upstream coolant jet towards the suction side, resulting in intensifying thermal load near the pressure side endwall. Hence a novel ribbed-endwall is introduced to suppress passage crossflow. The effects of the mass flow ratio and the rib layout were examined using numerical simulations by solving the three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations with the shear stress transport (SST) k-ω turbulence model. The results indicate that the ribs effectively prevent the coolant migrating from the pressure side to the suction side, helping the coolant jet to spread along the lateral orientation. Therefore, the endwall adiabatic film cooling effectiveness is substantially improved. The maximum cooling effectiveness is achieved for the case with three-ribs when the height of the rib equals one hole diameter among all cases. The area-averaged adiabatic cooling effectiveness is enhanced by 31.6% relative to the flat endwall when the mass flow ratio of coolant to mainstream equals to 0.52%. More importantly, the ribbed-endwall obtains a relatively lower level of aerodynamic loss owing to the reduced lateral migration inside the vane cascade.

Key words： vane endwall; micro-ribbed endwall; adiabatic film cooling effectiveness; flow structure; numerical study

Cite this article

DU Kun, CHEN Qihao, LI Yang, SUNDEN Bengt, LIU Cunliang, LI Wei . Numerical Investigation on Flow and Cooling Characteristics of a Micro-Ribbed Vane Endwall[J]. Journal of Thermal Science, 2023 , 32(2) : 786 -799 . DOI: 10.1007/s11630-023-1769-z

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