Effect of dielectric barrier discharge plasma on film cooling performance

Scientific paper - Original scientific paper

• Author: Jie Sun
• Author: Fuxing Zhang
• Author: Jin Wang
• Author: Jakov Baleta
• Author: Gongnan Xie
• Author: Bengt Sunden
• 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
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract (english)

To improve film cooling effectiveness of a gas turbine blade, a kind of
plasma actuator is introduced on the blade surface. The effect of three
arrangements of plasma actuators on flow characteristics and film cooling
performance is numerically investigated by a verified turbulence model.
Results show that the coolant air under plasma is pulled down to the wall,
and the near-wall air is sped up to promote the film cooling effectiveness
downstream the wall. It is discovered that the plasma actuators near the
film hole show weaker aerodynamic actuation than that downstream the wall.
Compared with the plasma actuators off case, the maximum improvement in the
wall-averaged film cooling effectiveness of the case with up plasma
actuators is 11.7% under low blowing ratios. The wall-averaged film cooling
effectivenesses of the cases with down plasma actuators and up-down plasma
actuators increase by 138.3% and 122.9% under the blowing ratio of 1.5..
Vortex structures are broken up, and vortex is separated by two jets
induced by aerodynamic actuation. The maximum wall pressure difference
reaches 1.89% when plasma actuator is arranged downstream the wall.

• Keywords (english): Aerodynamic actuation; Film cooling; Flow control; Gas turbine; Plasma arrangement
• 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. 26, no. 5 Part B, pp. 4157-4168
• p-ISSN: 0354-9836
• e-ISSN: 2334-7163
• DOI: https://doi.org/10.2298/TSCI2205157S
• URN:NBN: urn:nbn:hr:115:618009
• Publication: 2022
• Document URL: https://doiserbia.nb.rs/Article.aspx?ID=0354-98362205157S
• Type of resource: Text
• Access conditions: Restricted access
• Created on: 2024-05-03 16:46:15