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On the Flow Structures and Adiabatic Film Effectiveness for Simple and Compound Angle Hole With Varied Length-to-Diameter Ratio by Large Eddy Simulation and Pressure Sensitive Paint Techniques

[+] Author and Article Information
Weihong Li

Gas turbine institute, Department of thermal engineering, Tsinghua University, Beijing, China, 100084
Liwh13@mails.tsinghua.edu.cn

Wei Shi

Gas turbine institute, Department of thermal engineering, Tsinghua University, Beijing, China, 100084
shiwei15@mails.tsinghua.edu.cn

Xueying Li

Gas turbine institute, Department of thermal engineering, Tsinghua University, Beijing, China, 100084
lixueying@mail.tsinghua.edu.cn

Jing Ren

Gas turbine institute, Department of thermal engineering, Tsinghua University, Beijing, China, 100084
renj@tsinghua.edu.cn

Hongde Jiang

Gas turbine institute, Department of thermal engineering, Tsinghua University, Beijing, China, 100084
jianghd@tsinghua.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4037085 History: Received October 12, 2016; Revised May 24, 2017

Abstract

The effects of hole length to diameter ratio and compound angle on flat plate film cooling effectiveness are investigated from an experimental and numerical view. Film cooling effectiveness measurements are performed for seven blowing ratios (M) ranging from 0.3 to 2, five hole length to diameter ratios (L/D) from 0.5 to 5 and two compound angle (ß: 0°, 45°) using pressure sensitive paint (PSP) technique. Results indicate that discrete holes with L=0.5 and 1 show highest film cooling effectiveness regardless of compound angle. Round hole generally shows an increasing trend as L increases from 2 to 5, while compound angle hole shows a complex trend concerning with blowing ratios and length to diameter ratios. Compound angle enhances film cooling effectiveness with high blowing ratios and length to diameter ratios. In a parallel effort, LES approach is employed to solve the flow field and visualize vortex structures of in-tube and mainstream regions. It is demonstrated that the counter rotating vortex pair (CRVP) which is observed in the time-averaged flow field is originated in different vortex structures with varying blowing ratios and length to diameter ratios. Scalar field transportation features are also investigated to clarify how different vortex structures affect the temperature distribution and the film cooling effectiveness.

Copyright (c) 2017 by ASME
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