Publication detail

Degradation of Protective Coatings of Turbine Blades during Exploitation.

POKLUDA, J. KIANICOVÁ, M. ŠVEJCAR, J.

Czech title

Degradace ochranných povlaků lopatek turbín během provozu

English title

Degradation of Protective Coatings of Turbine Blades during Exploitation.

Type

conference paper

Language

en

Original abstract

Diffusion Al-Si coatings are used to protect rotor blades of the aircraft engine DV2 produced by HTC-AED a.s. Považská Bystrica, Slovakia, against high-temperature corrosion in environments containing sulphur compounds. The time-temperature area beyond a critical temperature of the outgoing gas is used as an empirical exploitation parameter D indicating a degradation level. The efficiency of such approach was investigated by analyzing the surface layers of high-pressure rotor blades after exploitation corresponding to different values of D. Simple relationships between the relative width of remaining layer and the parameter D for both the back and the trough of the blade were established. The relations indicate that the relative widths of remaining layers, corresponding to the upper limit Du = 1.5.10^9 K4.s2 (already requiring repair), correspond to 60 % for the back of the blade and 32 % for the trough. Thus, the relations yield a clear geometrical interpretation of the empirical parameter D. However, the methodology fails to provide reasonable information in a special case of the gas burning outside the combustion chamber due to a sudden decrease of turbine revolutions.

Czech abstract

Diffusion Al-Si coatings are used to protect rotor blades of the aircraft engine DV2 produced by HTC-AED a.s. Považská Bystrica, Slovakia, against high-temperature corrosion in environments containing sulphur compounds. The time-temperature area beyond a critical temperature of the outgoing gas is used as an empirical exploitation parameter D indicating a degradation level. The efficiency of such approach was investigated by analyzing the surface layers of high-pressure rotor blades after exploitation corresponding to different values of D. Simple relationships between the relative width of remaining layer and the parameter D for both the back and the trough of the blade were established. The relations indicate that the relative widths of remaining layers, corresponding to the upper limit Du = 1.5.10^9 K4.s2 (already requiring repair), correspond to 60 % for the back of the blade and 32 % for the trough. Thus, the relations yield a clear geometrical interpretation of the empirical parameter D. However, the methodology fails to provide reasonable information in a special case of the gas burning outside the combustion chamber due to a sudden decrease of turbine revolutions.

English abstract

Diffusion Al-Si coatings are used to protect rotor blades of the aircraft engine DV2 produced by HTC-AED a.s. Považská Bystrica, Slovakia, against high-temperature corrosion in environments containing sulphur compounds. The time-temperature area beyond a critical temperature of the outgoing gas is used as an empirical exploitation parameter D indicating a degradation level. The efficiency of such approach was investigated by analyzing the surface layers of high-pressure rotor blades after exploitation corresponding to different values of D. Simple relationships between the relative width of remaining layer and the parameter D for both the back and the trough of the blade were established. The relations indicate that the relative widths of remaining layers, corresponding to the upper limit Du = 1.5.10^9 K4.s2 (already requiring repair), correspond to 60 % for the back of the blade and 32 % for the trough. Thus, the relations yield a clear geometrical interpretation of the empirical parameter D. However, the methodology fails to provide reasonable information in a special case of the gas burning outside the combustion chamber due to a sudden decrease of turbine revolutions.

Keywords in Czech

degradace, ochrenné povlaky, listy turbán

Keywords in English

Degradation, Protective Coatings, Turbine Blades

RIV year

2008

Released

01.05.2008

ISBN

0000000000000

Book

Failures 2008

Edition number

1

Pages from–to

231–252

Pages count

220

BIBTEX


@inproceedings{BUT30265,
  author="Jaroslav {Pokluda} and Marta {Kianicová} and Jiří {Švejcar},
  title="Degradation of Protective Coatings of Turbine Blades during Exploitation.",
  booktitle="Failures 2008",
  year="2008",
  month="May",
  pages="231--252",
  isbn="0000000000000"
}