Influence of Surface Roughness on the Aerodynamic Losses of a Turbine Vane

Author:

Zhang Qiang1,Goodro Matt1,Ligrani Phillip M.21,Trindade Ricardo3,Sreekanth Sri4

Affiliation:

1. Convective Heat Transfer Laboratory, Department of Mechanical Engineering, University of Utah, Salt Lake City, Utah 84112-9208

2. ASME Fellow

3. Turbine Durability, United Technologies, Pratt and Whitney Corp., 400 Main Street, M/S 169-29, East Hartford, CT 06108

4. Turbine Cooling and Static Structures, Pratt and Whitney – Canada Corp. 22MC1, 1801 Courtney Park Drive East, Mississauga, Ontario L5T1J3, Canada

Abstract

The effects of surface roughness on the aerodynamic performance of a turbine vane are investigated for three Mach number distributions, one of which results in transonic flow. Four turbine vanes, each with the same shape and exterior dimensions, are employed with different rough surfaces. The nonuniform, irregular, three-dimensional roughness on the tested vanes is employed to match the roughness which exists on operating turbine vanes subject to extended operating times with significant particulate deposition on the surfaces. Wake profiles are measured for two different positions downstream the vane trailing edge. The contributions of varying surface roughness to aerodynamic losses, Mach number profiles, normalized kinetic energy profiles, Integrated Aerodynamics Losses (IAL), area-averaged loss coefficients, and mass-averaged loss coefficients are quantified. Total pressure losses, Mach number deficits, and deficits of kinetic energy all increase at each profile location within the wake as the size of equivalent sandgrain roughness increases, provided the roughness on the surfaces is uniform. Corresponding Integrated Aerodynamic Loss IAL magnitudes increase either as Mach numbers along the airfoil are higher, or as the size of surface roughness increases. Data are also provided which illustrate the larger loss magnitudes which are present with flow turning and cambered airfoils, than with symmetric airfoils. Also described are wake broadening, profile asymmetry, and effects of increased turbulent diffusion, variable surface roughness, and streamwise development.

Publisher

ASME International

Subject

Mechanical Engineering

Reference28 articles.

1. Nikuradse, J. , 1933, “Laws of Flow in Rough Pipes,” NACA TM 1292, National Advisory Committee on Aeronautics.

2. Schlichting, H. , 1936, “Experimental Investigation of the Problem of Surface Roughness,” NACA TM-832, National Advisory Committee on Aeronautics.

3. A Re-Evaluation of Schlichting’s Surface Roughness Experiment;Coleman;ASME J. Fluids Eng.

4. New Correlation of Roughness Density Effect on Turbulent Boundary Layer;Sigal;AIAA J.

5. Sigal, A., and Danberg, J. E., 1988, “Analysis of Turbulent Boundary Layer Over Roughness Surface With Application to Projectile Aerodynamics,” Amy Ballistic Research Lab, Aberdeen Proving Grounds MD, Technical Report BRL-TR-2977.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3