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Title: The influence of secondary flows near the endwall and boundary layer disturbance on convective transport from a turbine blade

Abstract

A naphthalene sublimation technique is used to investigate convective transport from a simulated turbine blade in a stationary linear cascade. In some of the tests undertaken, a trip wire is stretched along the span of the blade near the leading edge. The disturbance produced by tripping the boundary layers on the blade near the leading edge causes early boundary layer transition, creates high mass transfer rate on the pressure side and in the laminar flow region on the suction side, but lowers the transfer rate in the turbulent flow region on the suction side. Comparison is made with other heat and mass transfer studies in the two-dimensional region far from the endwall and good agreement is found. Near the endwall, flow visualization indicates a strong secondary flow pattern. The impact of vortices initiated near the endwall on the laminar-turbulent transition extends three-dimensional effects to about 0.8 chord lengths on the suction side and to about 0.2 chord lengths on the pressure side away from the endwall. The effect of the passage vortex and the new vortex induced by the passage vortex on mass transfer is clearly seen and can be traced along the suction surface of the blade. Close tomore » the endwall the highest mass transfer rate on the suction surface is not found near the leading edge. It occurs at about 27% of the curvilinear distance from the stagnation line to the trailing edge where a strong main flow and the secondary passage flow from the pressure side of the adjacent blade interact. The influences of some small but very intense corner vortices and the passage vortex on mass transfer are also observed on both surfaces of the blade.« less

Authors:
; ;  [1]
  1. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Mechanical Engineering
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
136542
Report Number(s):
CONF-940626-
Journal ID: JOTUEI; ISSN 0889-504X; TRN: IM9552%%84
Resource Type:
Journal Article
Journal Name:
Journal of Turbomachinery
Additional Journal Information:
Journal Volume: 117; Journal Issue: 4; Conference: 39. international gas turbine and aeroengine congress and exposition, The Hague (Netherlands), 13-16 Jun 1994; Other Information: PBD: Oct 1995
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; GAS TURBINE ENGINES; FORCED CONVECTION; ENERGY EFFICIENCY; TURBINE BLADES; GAS FLOW

Citation Formats

Goldstein, R J, Wang, H P, and Jabbari, M Y. The influence of secondary flows near the endwall and boundary layer disturbance on convective transport from a turbine blade. United States: N. p., 1995. Web. doi:10.1115/1.2836585.
Goldstein, R J, Wang, H P, & Jabbari, M Y. The influence of secondary flows near the endwall and boundary layer disturbance on convective transport from a turbine blade. United States. https://doi.org/10.1115/1.2836585
Goldstein, R J, Wang, H P, and Jabbari, M Y. 1995. "The influence of secondary flows near the endwall and boundary layer disturbance on convective transport from a turbine blade". United States. https://doi.org/10.1115/1.2836585.
@article{osti_136542,
title = {The influence of secondary flows near the endwall and boundary layer disturbance on convective transport from a turbine blade},
author = {Goldstein, R J and Wang, H P and Jabbari, M Y},
abstractNote = {A naphthalene sublimation technique is used to investigate convective transport from a simulated turbine blade in a stationary linear cascade. In some of the tests undertaken, a trip wire is stretched along the span of the blade near the leading edge. The disturbance produced by tripping the boundary layers on the blade near the leading edge causes early boundary layer transition, creates high mass transfer rate on the pressure side and in the laminar flow region on the suction side, but lowers the transfer rate in the turbulent flow region on the suction side. Comparison is made with other heat and mass transfer studies in the two-dimensional region far from the endwall and good agreement is found. Near the endwall, flow visualization indicates a strong secondary flow pattern. The impact of vortices initiated near the endwall on the laminar-turbulent transition extends three-dimensional effects to about 0.8 chord lengths on the suction side and to about 0.2 chord lengths on the pressure side away from the endwall. The effect of the passage vortex and the new vortex induced by the passage vortex on mass transfer is clearly seen and can be traced along the suction surface of the blade. Close to the endwall the highest mass transfer rate on the suction surface is not found near the leading edge. It occurs at about 27% of the curvilinear distance from the stagnation line to the trailing edge where a strong main flow and the secondary passage flow from the pressure side of the adjacent blade interact. The influences of some small but very intense corner vortices and the passage vortex on mass transfer are also observed on both surfaces of the blade.},
doi = {10.1115/1.2836585},
url = {https://www.osti.gov/biblio/136542}, journal = {Journal of Turbomachinery},
number = 4,
volume = 117,
place = {United States},
year = {Sun Oct 01 00:00:00 EDT 1995},
month = {Sun Oct 01 00:00:00 EDT 1995}
}