Numerical analysis and design optimization on full coverage film-cooling for turbine guided vane

Engineering Applications of Computational Fluid Mechanics

Cunliang Liu¹  Huiren Zhu¹  Mingrui Wang¹  Na Li¹  Tao Guo¹  Li Zhang¹ 

[1] School of Power and Energy, Northwestern Polytechnical University, Xi’an, People’s Republic of China;

关键词: Conjugate heat transfer;    turbine vane;    film cooling;    V-crater hole;    laidback hole;    discharge coefficient;   

DOI  :  10.1080/19942060.2021.2019127

来源: DOAJ

【 摘 要 】

Based on numerical simulations, the heat transfer and flow field of a turbine vane are analyzed and the film cooling is improved. The optimization objective is increasing the overall cooling effectiveness with cascade pressure loss factors staying almost unchanged. Thus, cylindrical film holes were replaced by laidback holes and V-crater holes. To analyze the effect of structural adjustment on the vane, pressure distributions, mass flow distributions, and heat transfer coefficients were investigated for internal and external cooling systems. To explain the advantages of shaped holes over cylindrical holes, the flow mechanisms, film superposition, discharge coefficients, blow ratios, and film cooling effectiveness were compared. Meanwhile, the influence of mass flow ratios and mainstream Reynolds numbers was analyzed. After optimization, at the design condition, the overall cooling effectiveness increased by 4.19% on the pressure surface and 1.78% on the suction surface. However, the cascade pressure loss factor increased by 0.26% only.

【 授权许可】

Unknown