Session: 36-01 Deposition and Erosion Effects

Paper Number: 79366

79366 - Effect of Temperature and Velocity on Microparticle Erosion/Deposition Into Environmental-Barrier-Coated CMC for Aeroengines 

Ceramic matrix composite (CMC), especially SiC/SiC, is given a lot of attention for its remarkable mechanical properties at higher temperatures. For protection of the substrate from oxidation, the SiC/SiC CMCs inherently require environmental barrier coating (EBC). Since aeroengines must function under a wide range of conditions and environments, the coated CMC has to be resistant enough to various damage modes. Among these, the effect of micro particles is one of the limiting factors for durability as well as performance of components, especially when the engine is operated in dusty areas.

The main goal of this experimental research is to investigate and find out the surface damage behavior of the coated CMC caused by micro sand particles. The data was surveyed across fairly broad range of exposed temperatures and velocities covering conditions very relevant to advanced hot section designs. In the experiments, silica or alumina sand entrained in the gas stream were jet-blasted from the nozzle and then impinged on the target CMC+EBC coupon.

Due to the fairly broad testing range, damage mode and the extent of damage vary considerably by condition. The obtained data were then reorganized and compared with several different particle impact models proposed in the past. This is to first understand and get a whole picture of all the probable consequences in the expected design/off-design conditions, and secondly to know the validity of and deviations from the conventional modeling with the present CMC+EBC material, which will be useful in the next component design phase.

Presenting Author: Yoji Okita Japan Aerospace Exploration Agency

Presenting Author Biography: Born in Tokyo. University education at Unv. of Tokyo. Had 30 years experience in IHI Corporation as designer and researcher in aeroengine aerodynamics and heat transfer field. Recently joined JAXA (Japan Aerospace Exploration Agency) and now a manager of turbine division of aeronautical technology directorate. Major areas of interest and expertise: Heat transfer and cooling technology of aero-engine/gas-turbine, multi-phase flow field, erosion/deposition mechanism in turbomachinery.

Authors:

Yoji Okita Japan Aerospace Exploration Agency
Masaya Suzuki Japan Aerospace Exploration Agency
Takashi Yamane Japan Aerospace Exploration Agency
Jun Hasegawa IHI Corporation
Yosuke Mizokami IHI Corporation
Takeshi Nakamura IHI Corporation