Optical fiber device and measuring method for turbine blade surface temperature distribution measuring

Abstract

An optical fiber device for turbine blade surface temperature distribution measuring comprises an optical fiber probe, a lens set is arranged in the optical fiber probe, the lens set and the optical fiber probe are connected to four optical fiber bundles, a double-color temperature measuring system for measuring the temperature of the surface of a turbine blade is formed by the first optical fiber bundle and the second optical fiber bundle, and a reflection type displacement measuring system for measuring position information of the turbine blade is formed by the third optical fiber bundle and the fourth optical fiber bundle. The optical fiber bundles respectively correspond to one optical filter. The light paths of the first optical fiber bundle, the second optical fiber bundle and the third optical fiber are respectively provided with one photovoltaic conversion part, and the light path of the fourth optical fiber is provided with an illuminating source. The double-color temperature measuring system and the reflection type displacement measuring system are connected with a data collecting instrument which is connected with a remote monitoring system through the network. The optical fiber device can measure the temperature of the surface of the turbine blade rotating at a high speed, the temperature changing characters can be monitored online in real time, and the serious failures such as probable blade ablation in an operating combustion gas turbine are prevented in advance.

Description

technical field [0001] The invention relates to an optical fiber device for measuring the temperature distribution on the surface of a high-temperature turbine blade. [0002] The invention also relates to a method for measuring and locating the surface temperature of a high-temperature turbine blade by using the measuring device. Background technique [0003] As a new type of power device, gas turbine plays an extremely important role in many fields of national economy and national defense construction. In the field of land power generation, the installed capacity of gas turbine power generation equipment is increasing day by day. In the field of ship power, the research and development of high-power gas turbines has become the mainstream of development. In the field of modern aviation, gas turbines are the preferred power plant for various military and civil aircraft. As one of the key components of a gas turbine, the turbine is an important hot-end component that convert...

AI Technical Summary

Problems solved by technology

[0004] At present, the surface temperature measurement of high-speed rotating parts generally adopts the contact measurement method. The commonly used thermocouple contact temperature measurement method is to embed the thermocouple on the surface of the blade for measurement, which can accurately locate the temperature measurement point, but the service life of the sensor is relatively long. Short, not easy to replace, and easy to fall off, there are potential safety hazards, especially the signal is difficult to lead out, requiring major changes to the turbine structure, which is not allowed in most cases

Due to the high-speed rotation of turbine blades, the extraction of contact measurement signals is also a bottleneck in its development. The common methods for extraction of contact measurement signals from high-speed rotating blades include slip ring induction method and digital rotary telemetry system. The slip ring induction device adopts physical The signal is led out by contact, which requires the contact friction of the dynamic and static contact ring surface, which requires high material and machining accuracy of the slip ring. Since the signal is led out by the dynamic and static joint surface, the signal transmission is easily disturbed, and it is difficult to achieve high speed and long life. slip ring

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