Purpose

This paper aims to investigate the influences of dimple location on the heat transfer performance of a pin fin-dimpled channel with upright/curved/inclined pin fins under stationary and rotating conditions.

Design/methodology/approach

Numerical methods based on a realizable k-ε turbulent model are used to conduct this study. Three kinds of pin fins (upright, curved, inclined) and three dimple locations (front, middle, behind) are studied for Ro varying from 0 to 0.5.

Findings

On the whole, pin fin plays a dominated role in heat transfer performance compared to dimple. The heading path and interaction of the longitudinal secondary flow and jet-like flow critically affect heat transfer performance. The formation, development and impingement of jet-like flow and longitudinal secondary flow are significantly affected by dimple locations. Dimple at behind position shows the poorest heat transfer enhancement.

Originality/value

This study is an extend of another previous study in which an innovative curved pin fin is proposed. The originality of this paper is to evaluate the heat transfer performance for the combined cooling structure of dimple and pin fin, which will provide original and useful application and experience for turbine blade design.

中文翻译：

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不同针翅和凹陷位置针翅凹陷通道传热特性的数值分析

目的

本文旨在研究在静止和旋转条件下，凹坑位置对具有直立/弯曲/倾斜销翅片的销翅凹坑通道传热性能的影响。

设计/方法/方法

基于可实现的 k-ε 湍流模型的数值方法用于进行这项研究。研究了三种针翅（直立、弯曲、倾斜）和三个凹坑位置（前、中、后），用于从 0 到 0.5 变化的 Ro。

发现

总体而言，针翅对传热性能的影响比凹坑要大。纵向二次流和射流的航向和相互作用对传热性能有重要影响。射流和纵向二次流的形成、发展和冲击受凹坑位置的显着影响。后面位置的凹坑显示出最差的传热增强效果。

原创性/价值

这项研究是之前另一项研究的延伸，其中提出了一种创新的弯曲针翅。本文的独创性在于对凹坑和针翅组合冷却结构的传热性能进行评估，为涡轮叶片设计提供独到的、有益的应用和经验。