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A novel test RIG for assessing advanced rotor blade cooling concepts, measurement technique and first results [in press]

Maximilian Elfner; Achmed Schulz; Hans-Jörg Bauer; Knut Lehmann

Abstract (englisch):
This paper presents a new approach for assessing rotor blade cooling concepts. A new test rig has been designed, built and commissioned, allowing fast comparison of different cooling schemes as well as absolute surface temperature measurements for different cooling concepts. By scaling the test specimen, full aerothermal similarity was achieved at high measurement accuracy and resolution. This similarity however poses high demand on the employed measurement techniques. Surface temperature (and thus cooling effectiveness) is measured using high resolution, high dynamic range infrared thermography with an improved calibration method for in-situ radiation correction. Furthermore, an improved image evaluation algorithm is presented, allowing angle-of-view dependent emissivity correction and full 3D-evaluation of image data. Those improvements enable the measurement on strongly cooled and strongly curved surfaces, and thus the use of scaled rotor blades with true geometry. First results are presented comparing total cooling effectiveness of a conventionally cooled blade with internal ribs to the effectiveness of an internal swirl design ... mehr

Zugehörige Institution(en) am KIT Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Jahr 2017
Sprache Englisch
Identifikator KITopen ID: 1000073148
Erschienen in Proceedings of ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition - Charlotte, NC, USA, June 27 - 29 2017
Schlagworte blade cooling, infrared thermography, turbine cooling
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