Abstract
In the modern turbo-machinery, reducing the clearance between the blade tip and casing inner face is an effective method to improve the power performance, but the clearance reduction leads to increased risk of blade-casing rubbing. In this paper, a blade-coating rubbing force model which considered the abradable coating scraping is developed to simulate the rotor system dynamic characteristics at blade-casing rubbing faults with abradable coating. An experimental tester is established to simulate the rotor system blade-casing rubbing faults; the AlSi-ployphenyl ester abradable coating is prepared and introduced into the blade-casing experiment to verify the model. After the vibration and force analysis in simulation and experiment, the dynamic characteristics and the influence factors of blade-casing rubbing rotor system are studied.
Highlights
With the development of aircraft, decreasing the blade tip and casing inner face clearance is one of the key measures to improve the aero-engine performance
Abradable coating sprayed on the casing inner face [1] has been used in turbo-machinery to avoid the rigid blade-casing rubbing, the serious accident can be decreased or avoid
When the rubbing fault occurs, the abradable coating is firstly in contact with the blade and scraped by the blade. e scraping process involves a variety of physical phenomena such as rubbing impact, heat transfer, friction, and coating wear
Summary
With the development of aircraft, decreasing the blade tip and casing inner face clearance is one of the key measures to improve the aero-engine performance. Most of the literature mainly focuses on the dynamic characteristics of the system under the blade-uncoated casing rubbing fault. Research on sealing coating mainly focuses on the scraping process, and the research on its influence on the dynamic characteristics of the system is insufficient. When the rubbing fault occurs, the abradable coating is firstly in contact with the blade and scraped by the blade. Nyssen and Batailly [9] investigated the thermal numerical model within the abradable coating in contact interactions and compared simulation and experiment data and studied the thermal impact effects on the dynamic characteristic of blade. And Legrand [13] studied the structural behavior of a high-
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