THERMAL SCIENCE

International Scientific Journal

Jin Wang

,

Ke Tian

,

Kai Zhang

,

Jakov Baleta

,

Bengt Sundén

EFFECT OF SPHERICAL BLOCKAGE CONFIGURATIONS ON FILM COOLING

ABSTRACT
With increasing inlet temperature of gas turbines, turbine blades need to be effectively protected by using cooling technologies. However, the deposition from the fuel impurities and dust particles in the air is often found inside film holes, which results in partial hole blockage. In this paper, the deposition geometry is simplified as a rectangular channel, and the effect of three blockage ratios is investigated by using the computational fluid dynamics. In addition, water droplets are also released from the coolant inlet to provide a comparison of the results with and without mist injection. It is found that the lateral film cooling effectiveness is reduced with increasing blockage ratio. For all the cases with the blowing ratio 0.6, 1% mist injection provides an improvement of the cooling performance by approximately 10%.
KEYWORDS
film cooling, blockage, mist injection, sphere, gas turbine
PAPER SUBMITTED: 2017-12-29
PAPER REVISED: 2018-02-27
PAPER ACCEPTED: 2018-02-28
PUBLISHED ONLINE: 2018-09-23
DOI REFERENCE: https://doi.org/10.2298/TSCI171229257W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2018, VOLUME 22, ISSUE Issue 5, PAGES [1933 - 1942]
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Effect of spherical blockage configurations on film cooling

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