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

R. J. Goldstein, H. P. Wang, M. Y. Jabbari

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 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.

Original languageEnglish (US)
Title of host publicationHeat Transfer; Electric Power; Industrial and Cogeneration
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791878866
DOIs
StatePublished - Jan 1 1994
EventASME 1994 International Gas Turbine and Aeroengine Congress and Exposition, GT 1994 - The Hague, Netherlands
Duration: Jun 13 1994Jun 16 1994

Publication series

NameProceedings of the ASME Turbo Expo
Volume4

Other

OtherASME 1994 International Gas Turbine and Aeroengine Congress and Exposition, GT 1994
CountryNetherlands
CityThe Hague
Period6/13/946/16/94

Fingerprint Dive into the research topics of 'The influence of secondary flows near the endwall and boundary layer disturbance on convective transport from a turbine blade'. Together they form a unique fingerprint.

Cite this