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Title: Development of a two-dimensional turbulent wake in a curved channel with a positive streamwise pressure gradient

Abstract

The development of turbomachinery wake flows is greatly influenced by streamline curvature and streamwise pressure gradient.This paper is part of a comprehensive experimental and theoretical study on the development of the steady and periodic unsteady turbulent wakes in curved channels at different streamwise pressure gradients. This paper reports on the 3experimental investigation of the two-dimensional wake behind a stationary circular cylinder in a curved channel at positive streamwise pressure gradient. Measurements of mean velocity and Reynolds stress components are carried out using a X-hot-film probe. The measured quantities obtained in probe coordinates are transformed to a curvilinear coordinate system along the wake center line and are presented in similarity coordinates. The results show strong asymmetry in velocity and Reynolds stress components. The Reynolds stress components have higher values at the inner half of the wake than at the outer half of the wake. However, the mean velocity defect profiles in similarity coordinates are almost symmetric and follow the same Gaussian function for the straight wake data. A comparison with the wake development in a curved channel at zero streamwise pressure gradient suggests the decay rate of velocity defect is slower and the growth of wake width is faster for amore » positive streamwise pressure gradient.« less

Authors:
;  [1]
  1. Texas A and M Univ., College Station, TX (United States). Turbomachinery Performance Lab.
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
267957
Resource Type:
Journal Article
Journal Name:
Journal of Fluids Engineering
Additional Journal Information:
Journal Volume: 118; Journal Issue: 2; Other Information: PBD: Jun 1996
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 33 ADVANCED PROPULSION SYSTEMS; GAS TURBINES; TURBULENT FLOW; STANDING WAVES; TURBOMACHINERY; AERODYNAMICS; HEAT TRANSFER

Citation Formats

John, J, and Schobeiri, M T. Development of a two-dimensional turbulent wake in a curved channel with a positive streamwise pressure gradient. United States: N. p., 1996. Web. doi:10.1115/1.2817376.
John, J, & Schobeiri, M T. Development of a two-dimensional turbulent wake in a curved channel with a positive streamwise pressure gradient. United States. https://doi.org/10.1115/1.2817376
John, J, and Schobeiri, M T. 1996. "Development of a two-dimensional turbulent wake in a curved channel with a positive streamwise pressure gradient". United States. https://doi.org/10.1115/1.2817376.
@article{osti_267957,
title = {Development of a two-dimensional turbulent wake in a curved channel with a positive streamwise pressure gradient},
author = {John, J and Schobeiri, M T},
abstractNote = {The development of turbomachinery wake flows is greatly influenced by streamline curvature and streamwise pressure gradient.This paper is part of a comprehensive experimental and theoretical study on the development of the steady and periodic unsteady turbulent wakes in curved channels at different streamwise pressure gradients. This paper reports on the 3experimental investigation of the two-dimensional wake behind a stationary circular cylinder in a curved channel at positive streamwise pressure gradient. Measurements of mean velocity and Reynolds stress components are carried out using a X-hot-film probe. The measured quantities obtained in probe coordinates are transformed to a curvilinear coordinate system along the wake center line and are presented in similarity coordinates. The results show strong asymmetry in velocity and Reynolds stress components. The Reynolds stress components have higher values at the inner half of the wake than at the outer half of the wake. However, the mean velocity defect profiles in similarity coordinates are almost symmetric and follow the same Gaussian function for the straight wake data. A comparison with the wake development in a curved channel at zero streamwise pressure gradient suggests the decay rate of velocity defect is slower and the growth of wake width is faster for a positive streamwise pressure gradient.},
doi = {10.1115/1.2817376},
url = {https://www.osti.gov/biblio/267957}, journal = {Journal of Fluids Engineering},
number = 2,
volume = 118,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 1996},
month = {Sat Jun 01 00:00:00 EDT 1996}
}