Turbine blade testing device and testing method thereof
According to one embodiment, a testing device of a turbine blade includes: a non-compressive elastic medium brought into close contact with a platform of the turbine blade in a state fastened to a turbine rotor; a probe which has piezoelectric elements arranged in an array and transmits ultrasound waves toward a fastening portion of the turbine blade through the elastic medium and receives echo waves; and a display portion for imaging an internal region of the fastening portion on the basis of the echo waves and displaying the same.
1. A testing device of a turbine blade comprising:
an elastic medium configured to contact with a platform of the turbine blade in a state fastened to a turbine rotor;
a probe, comprising piezoelectric elements arranged in an array, configured to transmit ultrasound waves toward a fastening portion of the turbine blade through the elastic medium contacting with the platform and to receive echo waves of the ultrasound waves; an accommodating chamber configured to accommodate the probe and the elastic medium and further configured to hold the probe contacting with the elastic medium that is in contact with the platform; and
a display configured to image an internal region of the fastening portion on the basis of the echo waves, wherein the accommodating chamber comprises:
an opening from which the elastic medium is configured to contact with the platform;
a first support, extending in a radial direction of the turbine rotor, configured to abut with the turbine blade;
a second support, extending in a rotation axis direction of the turbine rotor, configured to abut with the turbine blade; and
a position adjuster configured to adjust a position of the probe in the accommodating chamber.
2. The testing device of a turbine blade according to claim 1 , wherein
the elastic medium has a reversed shape of the platform to be brought into close contact.
3. The testing device of a turbine blade according to claim 1 ,
wherein
the elastic medium is mixed with magnetic body particles.
4. The testing device of a turbine blade according to claim 1 , wherein:
a thickness or a propagation damping rate of the elastic medium is set in order to prevent multiple reflected waves generated between the probe and the platform from being superposed on echo waves from a region including the fastening portion.
5. A testing method of a turbine blade, comprising
preparing a probe, an elastic medium, and an accommodating chamber, the accommodating chamber comprising:
an opening;
a first support extending in a radial direction of the turbine rotor;
a second support extending in a rotation axis direction of the turbine rotor,
accommodating the probe and the elastic medium in the accommodating chamber so that the elastic medium is placed adjacent to the opening;
abutting the first and the second support with the turbine rotor so that the elastic medium contacts with a platform of the turbine blade in a state fastened to a turbine rotor through the opening;
transmitting ultrasound waves from a probe toward a fastening portion of the turbine blade through the elastic medium;
receiving echo waves of the transmitted ultrasound waves by the probe; and
imaging an internal region of the fastening portion on the basis of the echo waves.
6. The testing method of a turbine blade according to claim 5 , further comprising:
adjusting a position of the probe in the accommodating chamber.