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research-article

Effects of Inlet Swirl on Pressure Side Film Cooling of Neighboring Vane Surface

[+] Author and Article Information
Yang Zhang

Department of Thermal Physics and Power Engineering Beijing, Select State/Province 100084 China yangzhang2014@mail.tsinghua.edu.cn

Yifei Li

Department of Thermal Engineering, Tsinghua University, Haidian District Beijing, 100084 China liyifei14@mails.tsinghua.edu.cn

Xiutao Bian

Tsinghua Unviersity Beijing, 100084 China bxt15@mails.tsinghua.edu.cn

Xin Yuan

Department of Thermal Engineering Tsinghua University Beijing, 100084 China yuanxin@mail.tsinghua.edu.cn

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received October 17, 2017; final manuscript received February 18, 2019; published online xx xx, xxxx. Assoc. Editor: Ting Wang.

ASME doi:10.1115/1.4043260 History: Received October 17, 2017; Accepted February 18, 2019

Abstract

The lean combustion chamber of a low NOx emission engine has a short distance between combustion outlet and Nozzle Guide Vanes (NGVs), with strong swirlers located upstream of the turbine inlet to from steady circulation in the combustion region. Though the lean combustion design benefits emission control, it complicates the turbine's aerodynamics and heat transfer. The strong swirling flow will influence the near-wall flow field, where film cooling acts. This research investigates the influence of inlet swirl on the film cooling of cascades.

The inlet swirl is produced by a swirler placed upstream, near the inlet, at five positions along the pitchwise direction. These are: Blade1 aligned, Passage 1-2 aligned, Blade2 aligned, Passage 2-3 aligned and Blade3 aligned. According to the experimental results, the near-hub region is strongly influenced by inlet swirl, where the averaged film cooling effectiveness can differ by up to 12% between the neighboring blades. At the spanwise location Z/Span = 0.7, when the swirler is moved from Blade 1 aligned (Position 5) to Blade 2 aligned (Position 3), the film cooling effectiveness in a small area near the blade hubs can change by up to 100%.

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