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Experimental Investigation of Rotor Tip Film Cooling at an Axial Turbine with Swirling Inflow Using Pressure Sensitive Paint

Wilhelm, Manuel ; Schiffer, Heinz-Peter (2021):
Experimental Investigation of Rotor Tip Film Cooling at an Axial Turbine with Swirling Inflow Using Pressure Sensitive Paint. (Publisher's Version)
In: International Journal of Turbomachinery, Propulsion and Power, 4 (3), MDPI, e-ISSN 2504-186X,
DOI: 10.26083/tuprints-00019089,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Experimental Investigation of Rotor Tip Film Cooling at an Axial Turbine with Swirling Inflow Using Pressure Sensitive Paint
Language: English
Abstract:

Rotor tip film cooling is investigated at the Large Scale Turbine Rig, which is a 1.5-stage axial turbine rig operating at low speeds. Using pressure sensitive paint, the film cooling effectiveness η at a squealer-type blade tip with cylindrical pressure-side film cooling holes is obtained. The effect of turbine inlet swirl on η is examined in comparison to an axial inflow baseline case. Coolant-to-mainstream injection ratios are varied between 0.45% and 1.74% for an engine-realistic coolant-to-mainstream density ratio of 1.5. It is shown that inlet swirl causes a reduction in η for low injection ratios by up to 26%, with the trailing edge being especially susceptible to swirl. For injection ratios greater than 0.93%, however, η is increased by up to 11% for swirling inflow, while for axial inflow a further increase in coolant injection does not transfer into a gain in η.

Journal or Publication Title: International Journal of Turbomachinery, Propulsion and Power
Journal volume: 4
Number: 3
Publisher: MDPI
Collation: 19 Seiten
Classification DDC: 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 16 Department of Mechanical Engineering > Institute of Gas Turbines and Aerospace Propulsion (GLR)
Date Deposited: 02 Jul 2021 12:30
Last Modified: 02 Jul 2021 12:30
DOI: 10.26083/tuprints-00019089
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-190892
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/19089
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