Effect of spherical blockage configurations on film cooling

Scientific paper - Original scientific paper

• Author: Jin Wang
• Author: Tian Ke
• Author: Kai Zhang
• Author: Jakov Baleta; MBZ: 340845
• Author: Bengt Sundén
• Author's institution: University of Zagreb; Faculty of Metallurgy; (Department of Mechanical Metallurgy); (Laboratory of Thermal Technics and Mechanical Engineering)
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Process Energy Engineering

Abstract (english)

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 (english): film cooling; blockage; mist injection; sphere; gas turbine
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Thermal science
• Numbering: vol. 22, no. 5, pp. 1-10
• p-ISSN: 0354-9836
• DOI: https://doi.org/10.2298/tsci171229257w
• URN:NBN: urn:nbn:hr:115:874613
• Publication: 2018
• Document URL: http://bib.irb.hr/956710
• Type of resource: Text
• Access conditions: Open access
• Created on: 2019-10-23 14:13:19