NDLI: Optical Investigation of Profile Losses in a Linear Turbine Cascade

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Alhaj, Olga Joerg, R. Seume
Copyright Year	2010
Abstract	Two or three dimensional flow visualisation is an active research field because of its non-intrusiveness. However, its application is often restricted to ideal laboratory conditions. Only few of the multi-dimensional flow visualization techniques have been developed into quantitative measurement techniques which are applicable to turbo machinery flow conditions. This paper demonstrates the application of completely optical measurements for the estimation of the loss coefficient of turbine blades in a linear cascade wind tunnel, which represents flow conditions close to the real but geometrically simplified and therefore more accessible. Two optical means were combined for this purpose. To determine the velocity field of the wake, two-component Particle Image Velocimetry (PIV) was employed. Tomographical Background Oriented Schlieren method (BOS), using 8 cameras placed in 180° around the cascade, was used for measuring a 3-D density field in the wake. For purposes of comparison, the traditional loss estimation method with 5-hole pressure probes accompanied the optical methods. Inlet parameters were measured with a Prandtl probe and a temperature sensor. The optical techniques are, once they are installed as in the present work, much faster than any other conventional method, e.g. pneumatic probes. Moreover, optical techniques can be used for investigation of transient flows.
Sponsorship	International Gas Turbine Institute
Starting Page	1503
Ending Page	1513
Page Count	11
File Format	PDF
ISBN	9780791844021
DOI	10.1115/GT2010-23166
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 Wind tunnels Cascades (fluid dynamics) Schlieren methods Unsteady flow Flow (dynamics) Density Machinery Pressure Temperature sensors Optical measurement Particulate matter Flow visualization Wakes Turbochargers Probes Turbines
Content Type	Text
Resource Type	Article

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