CUED Publications database

Influence of the state of the inlet endwall boundary layer on the interaction between pressure surface separation and endwall flows

de la Rosa Blanco, E and Hodson, HP and Vazquez, R and Torre, D (2003) Influence of the state of the inlet endwall boundary layer on the interaction between pressure surface separation and endwall flows. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 217. pp. 433-442. ISSN 0957-6509

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Abstract

This paper describes the effect of the state of the inlet boundary layer (laminar or turbulent) on the structure of the endwall flow on two different profiles of low-pressure (LP) turbine blades (solid thin and hollow thick). At present the state of the endwall boundary layer at the inlet of a real LP turbine is not known. The intention of this paper is to show that, for different designs of LP turbine, the state of the inlet boundary layer affects the performance of the blade in very different ways. The testing was completed at low speed in a linear cascade using area traversing, flow visualization and static pressure measurements. The paper shows that, for a laminar inlet boundary layer, the two profiles have a similar loss distribution and structure of endwall flow. However, for a turbulent inlet boundary layer the two profiles are shown to differ significantly in both the total loss and endwall flow structure. The pressure side separation bubble on the solid thin profile is shown to interact with the passage vortex, causing a higher endwall loss than that measured on the hollow thick profile.

Item Type: Article
Uncontrolled Keywords: Endwall flows Hollow profile Laminar Pressure surface separation bubble Thin profile Turbulent
Subjects: UNSPECIFIED
Divisions: Div A > Turbomachinery
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:03
Last Modified: 27 Nov 2014 19:22
DOI: 10.1243/095765003322315496