Coherent structure and heat transfer analysis of radial single/dual-stages nozzle vortex cooling at the leading edge of gas turbine blades

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2025-10-03 DOI:10.1016/j.icheatmasstransfer.2025.109729

Xiaodong Wang, Chang Liu, Qixuan Dong, Jingyi Zhao, Canlong Lai, Jiayu Lin, Jie Ji, Minghou Liu

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引用次数: 0

Abstract

The design of an effective leading-edge cooling system is of paramount importance for the gas turbine. In this study, a radial dual-stage nozzle vortex cooling (RDNVC) system is proposed and its coherent structures and their effect on heat transfer are numerically studied using LES at Re = 10,000 and compared with radial single-stage nozzle vortex cooling (RSNVC). The findings reveal that the heat transfer performance of RDNVC is superior to that of RSNVC, with both structures exhibiting high local Nusselt numbers (Nu) concentrated at the nozzle exit. Inside the vortex tube, there are four special vortices, and the flow is found to be strongly rotational with weak helical feature. Due to shear effects, RSNVC has an approximately anti-symmetric vortex shedding structure at the tangential inlet with a frequency of 718 Hz, while RDNVC having a spanwise vortex structure at the tangential inlet with a frequency of 2850 Hz. The precessing vortex core (PVC) frequencies of RSNVC and RDNVC are 50.79 Hz and 81.30 Hz, respectively. PVC induces two fluctuating temperature opposite vortices, forming a large-scale heat transfer structure inside the tube. Due to the Kelvin-Helmholtz instability caused by shear between two tangential jet, RDNVC has a higher radial turbulent heat flux.

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燃气轮机叶片前缘径向单/双级喷嘴涡冷却的相干结构及传热分析

设计一个有效的前缘冷却系统对燃气轮机至关重要。本文提出了一种径向双级喷嘴涡旋冷却系统（RDNVC），在Re = 10000的条件下对其相干结构及其对换热的影响进行了数值研究，并与径向单级喷嘴涡旋冷却系统（RSNVC）进行了比较。结果表明，RDNVC的换热性能优于RSNVC，两种结构均具有较高的局部努塞尔数（Nu），集中在喷嘴出口。旋涡管内有四个特殊的旋涡，流动具有强旋转和弱螺旋特征。由于剪切效应，RSNVC在切向进口处具有频率为718 Hz的近似反对称涡脱落结构，而RDNVC在切向进口处具有频率为2850 Hz的展向涡结构。RSNVC和RDNVC的加工涡核频率分别为50.79 Hz和81.30 Hz。PVC在管内产生两个温度相对波动的涡流，形成大规模的换热结构。由于两个切向射流之间的剪切引起的Kelvin-Helmholtz不稳定性，RDNVC具有较高的径向湍流热通量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.