Abstract
Blade tip clearance is one of the important parameters affecting the performance, safety and stability of a gas turbine engine. However, it is difficult to measure the tip clearance in real time and accurately during the development and test process of an engine. In order to promote the development of tip clearance–measuring technology and the optimal design of the gas turbine engine, some typical measuring methods of tip clearance and a novel measuring method based on AC discharge are introduced. In this article, the significance for measuring tip clearance of an engine is illustrated first. Then, operating principles, characteristics and developments of those typical measurement approaches are introduced. After that, these methods are analyzed, and the particular characteristic of each measuring approach is summarized.
Highlights
New types of aircrafts have put forward higher performance and stability requirements for an engine, which has brought great challenges to the development of engines
As an important parameter that affects the efficiency, stability and safety of the gas turbine engine, blade tip clearance, which is the radial distance between a rotor blade tip and the engine casing, has become the focus of researchers
A simulation result showed that compared with configuration 1, which has a small tip clearance of multistage high-pressure compressor, configuration 2, which has a large tip clearance of multistage high-pressure compressor, causes the stable operating range to be reduced by Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing University of Aeronautics and Astronautics, Nanjing, China
Summary
New types of aircrafts have put forward higher performance and stability requirements for an engine, which has brought great challenges to the development of engines. With the purpose of improving the heat resistance of sensor, an eddy current sensor for tip-clearance measurement was designed by researchers, which could work at a high temperature of 1075 K.
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