NDLI: Effects of an Upstream Cavity on the Secondary Flow in a Transonic Turbine Cascade

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ella, H. M. Abo El Sjolander, S. A. Praisner, T. J.
Copyright Year	2010
Abstract	This paper examines experimentally the effects of an upstream cavity on the flow structures and secondary losses in a transonic linear turbine cascade. The cavity approximates the endwall geometry resulting from the platform overlap at the interface between stationary and rotating turbine blade rows. Previous investigations of the effects of upstream cavity geometries have been conducted mainly at low-speed conditions. The present work aims to extend such research into the transonic regime with a more engine representative upstream platform geometry. The investigations were carried out in a blow-down type wind tunnel. The cavity is located at 30% of axial-chord from the leading edge, extends 17% of axial-chord in depth, and is followed by a smooth ramp to return the endwall to its nominal height. Two cascades are examined for the same blade geometry: the baseline cascade with a flat endwall and the cascade with the cavity endwall. Measurements were made at the design incidence and the outlet design Mach number of 0.80. At this condition, the Reynolds number based on outlet velocity is about 600,000. Off-design outlet Mach numbers of 0.69, and 0.89 were also investigated. Flowfield measurements were carried out at 40% axial-chord downstream of the trailing edge, using a seven-hole pressure probe, to quantify losses and identify the flow structures. Additionally, surface flow visualization using an ultra-violet reactive dye was employed at the design Mach number, on the endwall and blade surfaces, to help in the interpretation of the flow physics. The experimental results also include blade-loading distributions, and the probe measurements were processed to obtain total-pressure loss coefficients, and stream-wise vorticity distributions. It was found that the presence of the upstream cavity noticeably altered the structure and the strength of the secondary flow. Some effect on the secondary losses was also evident, with the cavity having a larger effect at the higher Mach number.
Sponsorship	International Gas Turbine Institute
Starting Page	1413
Ending Page	1424
Page Count	12
File Format	PDF
ISBN	9780791844021
DOI	10.1115/GT2010-22843
e-ISBN	9780791838723
Volume Number	Volume 7: Turbomachinery, Parts A, B, and C
Conference Proceedings	ASME Turbo Expo 2010: Power for Land, Sea, and Air
Language	English
Publisher Date	2010-06-14
Publisher Place	Glasgow, UK
Access Restriction	Subscribed
Subject Keyword	Turbine blades Blades Wind tunnels Cascades (fluid dynamics) Reynolds number Flow (dynamics) Pressure Engines Physics Design Geometry Cavities Chords (trusses) Vorticity Flow visualization Probes Turbines Mach number
Content Type	Text
Resource Type	Article

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