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Journal of Thermal Science

热科学学报

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2022 , Vol. 31 >Issue 1: 214 - 223

DOI: https://doi.org/10.1007/s11630-022-1550-8

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Effects of Variable Jet Nozzle Angles on Cross-Flow Suppression and Heat Transfer Enhancement of Swirl Chamber

  • XIAO Kun ,
  • HE Juan ,
  • FENG Zhenping
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  • Institute of Turbomachinery, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

网络出版日期: 2023-11-30

基金资助

This study is financially supported by the National Natural Science Foundation of China (Grant No. 51876156).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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Effects of Variable Jet Nozzle Angles on Cross-Flow Suppression and Heat Transfer Enhancement of Swirl Chamber

  • XIAO Kun ,
  • HE Juan ,
  • FENG Zhenping
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  • Institute of Turbomachinery, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China

Online published: 2023-11-30

Supported by

This study is financially supported by the National Natural Science Foundation of China (Grant No. 51876156).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022
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摘要

本文研究了渐变喷嘴角对燃气透平高温叶片前缘旋流冷却中横流抑制和换热强化的影响。以传统带垂直射流喷嘴的旋流腔为基准模型，采用三维定常数值分析方法，研究了其流动和换热特性，揭示了横流削弱下游射流和换热的机理。在此基础上，对比研究了带渐变喷嘴角和带垂直喷嘴角的旋流腔中的流动结构和换热特性。结果表明：对于带垂直喷嘴角的旋流腔，随着流动的发展，冷气的周向速度逐渐减小，轴向速度逐渐增大，从而形成横流。横流使下游射流偏斜，并裹挟射流至旋流腔中心，从而削弱了下游换热。对于带渐变喷嘴角的旋流腔，下游射流具有轴向朝上游方向的分速度，和横流的轴向速度相反，从而在一定程度上抑制了横流的不利影响，强化了靶面换热。随着流动的发展，横流的轴向速度逐渐增加，同时喷嘴角也逐渐增加，从而形成了相对平衡。在所有的角度增量条件下，同功耗下的热性能参数TPF均大于1。

关键词： swirl cooling; cross-flow; heat transfer enhancement; variable jet nozzle angle

本文引用格式

XIAO Kun , HE Juan , FENG Zhenping . Effects of Variable Jet Nozzle Angles on Cross-Flow Suppression and Heat Transfer Enhancement of Swirl Chamber[J]. 热科学学报, 2022 , 31(1) : 214 -223 . DOI: 10.1007/s11630-022-1550-8

Abstract

This paper investigated the effects of variable jetting nozzle angles on the cross-flow suppression and heat transfer enhancement of swirl cooling in gas turbine leading edge. The swirl chamber with vertical jet nozzles was set as the baseline, and its flow fields and heat transfer characteristics were analyzed by 3D steady state Reynolds-averaged numerical methods to reveal the mechanism of cross-flow weakening the downstream jets and heat transfer. On this basis, the flow structure on different cross sections and heat transfer characteristics of swirl chamber with variable jetting nozzle angels were compared with the baseline swirl chamber. The results indicated that for the baseline swirl chamber the circumferential velocity gradually decreased and the axial velocity gradually increased, and the cross-flow gradually formed. The cross-flow deflected the downstream jets and drawn them to the center of the chamber, thus weakening the heat transfer. For swirl chamber with variable jetting nozzle angles, the air axial velocity is axial upstream, opposite to the mainstream, so that the impact effects of cross-flow on the jets were reduced, and the heat transfer was enhanced. Furthermore, with the increase of axial velocity along the swirl chamber, the jetting nozzle angle also gradually increased, as well as the effect of cross-flow suppression, which formed a relative balance. For all swirl chambers with variable jet nozzle angles, the thermal performance factors were all larger than 1, which indicated the heat transfer was enhanced with less friction increment.

Key words： swirl cooling; cross-flow; heat transfer enhancement; variable jet nozzle angle

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