TY - JOUR
TI - Effect of dielectric barrier discharge plasma on film cooling performance
AU - Sun Jie
AU - Zhang Fuxing
AU - Wang Jin
AU - Baleta Jakov
AU - Xie Gongnan
AU - Sundén Bengt
JN - Thermal Science
PY - 2022
VL - 26
IS - 5
SP - 4157
EP - 4168
PT - Article
AB - 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.