Abstract

This article describes methods suitable for crack detection on low pressure steam turbine blades, not including the blade root. These cracks, which are initiated in the corrosion pitting, can cause serious damage to the steam turbine blade leading to its breakaway. Therefore, the detection of these cracks on the early stages of blade fracture is very important. Several methods for detecting of surface cracks (ultrasonic Rayleigh waves, eddy current with flexible array probe, etc.) has been tested on artificial flaws, which were manufactured into turbine blades. The comparison of all these methods is described as well as the evaluation of their advantages and disadvantages. Simulations of ultrasonic testing are also presented in this article.

References

References
1.
Patera
,
J.
, and
Zahradka
,
P.
,
2016
, “
Corrosion Pitting Monitoring on Low Pressure Turbine Blades
,”
12th International Conference on Nondestructive Evaluation in Relation to Structural Integrity for Nuclear and Pressurized Components
,
Dubrovnik, Croatia
.https://www.ndt.net/article/jrc-nde2016/papers/Patera12thNDE.pdf
2.
Siegl
,
J.
,
Kovarik
,
J.
, and
Nedbal
,
O.
,
2013
, Failure analysis of blade (Posouzeni poruchy lopatky c. 9056),
Prague, Czech Republic
, Report No. 9056, FJFI ČVUT Praha.
3.
Liyanage
,
I.
,
2015
, “
Thermomechanical Failure of Turbine Blades. Analysis and Recommendations
,” Bachelor thesis,
Aerospace Technology at Coventry University
,
United Arab Emirates, Dubai
.
4.
Soltes
,
J.
,
Viererbl
,
L.
,
Lahodova
,
Z.
,
Koleska
,
M.
, and
Vins
,
M.
,
2016
, “
Thermal Neutron Filter Design for the Neutron Radiography Facility at the LVR-15 Reactor
,”
IEEE Trans. Nucl. Sci.
,
63
(
3
), pp.
1640
1644
.10.1109/TNS.2016.2553362
5.
Soltes
,
J.
,
Viererbl
,
L.
,
Vacik
,
J.
,
Tomandl
,
I.
,
Krejci
,
F.
, and
Jakubek
,
J.
,
2016
, “
The New Facility for Neutron Radiography at the LVR-15 Reactor
,”
J. Phys. Conf. Ser.
,
746
(
1
), p.
012041
.10.1088/1742-6596/746/1/012041
You do not currently have access to this content.