Session: 12-10 Film Cooling with Thermal Barrier Coatings

Paper Number: 82118

82118 - Experimental Investigation of the Effects of Thermal Barrier Coating on Twisted Blade Full Film Cooling 

Film cooling and thermal barrier coating technologies are often used in thermal protection of aero-engine turbine blades. But the film-hole structure can be often affected by thermal barrier coatings (TBC) spraying, resulting in the variations of aerodynamic and thermal performances of film cooling. In this paper, the adiabatic film cooling effectiveness distribution contours of twisted blades in fan-shaped cascade tunnel were obtained by PSP technology. The effects of TBC on twisted blades film cooling effectiveness were studied, which was sprayed by electron beam physical vapor deposition (EB-PVD). Three typical density radios (DR) of 1.0,1.5, and 2.0 were chosen at mass flow ratio (MFR) of 8.92%,10.45%, and 12.21%. The results indicated that the TBC improved film cooling effectiveness on suction surface by 6.2%-16.67%, and significantly reduced the film cooling effectiveness on the leading edge (37.7% - 52.7%) and the gill areas of the pressure surface (28.8%-32%) . In these three regions, the difference between blades with and without TBC was slightly affected by the change of MFR, and gradually decreased with the increase of density ratio. The film cooling effectiveness of the pressure surface near the trailing edge was less weakened by the TBC, where the maximum reduction was 8.92%. Compared with the cylindrical hole rows, TBC has less impacts on the film cooling effectiveness at fan-shaped hole rows.

Presenting Author: haonan Yan Northwestern Polytechnical University

Presenting Author Biography: Master student of Northwestern Polytechnical University, research interest is heat transfer and cooling of high-temperature components of aero-engines

Authors:

haonan Yan Northwestern Polytechnical University
Cunliang Liu Shaanxi Key Laboratory of Thermal Sciences in Aero-Engine System
Li Zhang Northwestern Polytechnical University
Yuhang Guo Northwestern Polytechnical University