Large eddy simulation of compound angle film cooling with round holes embedded in ginkgo-shaped craters

IF 5.8 1区工程技术 Q1 ENGINEERING, AEROSPACE Aerospace Science and Technology Pub Date : 2025-05-01 Epub Date: 2025-02-08 DOI:10.1016/j.ast.2025.110047

Zhiyuan Zhao , Fengbo Wen , Zuobiao Li , Jiajun Han , Yu Li , Xinghong Zhang , Songtao Wang

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Abstract

Film cooling holes embedded in craters or trenches are gaining attention as recent advancements in gas turbines due to significant improvements in film cooling effectiveness. Inspired by ginkgo leaves, a novel ginkgo-shape film cooling crater with two spreading lobes has been investigated using large eddy simulation (LES), achieving considerable enhancements in film cooling performance. A comprehensive evaluation of coolant film distribution and vortical structure variation is illustrated to understand the flow dynamics of compound cooling jets emerging from cooling holes embedded in the ginkgo craters at the blowing ratio of M = 1.0 and the density ratio of DR = 2.0. The film cooling effectiveness is greatly improved with compound angles of 0 deg and 30 deg due to the wide lateral expansion of coolant film and less coolant separation in the streamwise direction. However, the ginkgo crater deteriorates the cooling performance with a compound angle of 60 deg because of the enlarged uncooled gap between the adjacent holes. Instantaneous and time-averaged vortical structures are examined, showing that the upwash counter-rotating vortex pair (CRVP) and the asymmetric vortex (ASV) are greatly weakened. The origination and evolvement of the shear layer vortex and the hairpin vortex are discussed in detail with the effect of the ginkgo crater in the current work.

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银杏形弹坑内嵌圆孔复合角膜冷却大涡模拟

由于气膜冷却效率的显著提高，嵌入在陨石坑或沟槽中的气膜冷却孔最近在燃气轮机中取得了进展，引起了人们的关注。受银杏叶的启发，利用大涡模拟（LES）研究了一种具有两个扩展叶的银杏形状的新型膜冷却坑，取得了相当大的膜冷却性能提高。为了了解在吹风比M = 1.0、密度比DR = 2.0条件下，银杏坑内冷却孔中复合冷却射流的流动动力学，对冷却液膜分布和涡旋结构变化进行了综合评价。在0°和30°复合角度下，由于冷却液膜的横向扩展范围广，且冷却液在流方向上的分离较少，大大提高了膜冷却效果。而银杏坑在复合角度为60°时，由于邻近孔间的非冷却间隙扩大，导致冷却性能恶化。对瞬时涡结构和时均涡结构进行了分析，结果表明上冲逆旋涡对（CRVP）和非对称涡（ASV）被大大削弱。在银杏坑的影响下，详细讨论了剪切层涡和发夹涡的形成和演化过程。

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来源期刊

Aerospace Science and Technology 工程技术-工程：宇航

CiteScore

10.30

自引率

28.60%

发文量

654

审稿时长

54 days

期刊介绍： Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.