Influence of Sand Particle Size on the Erosive Wear of Compressor Blade in an Aero-turboshaft Engine

doi:10.3901/JME.2022.19.180

Abstract

Abstract: Sand particles of different sizes inevitably cause erosive wear on the compressor blades of turboshaft engine in service environments such as plateaus, deserts and coastal areas, which can damage the profile and dynamic characteristics of the blades, and seriously affect the service life of turboshaft engines and the flight safety of helicopters. Based on the Finnie erosive wear theory, the expression showing the wear rate on the metal surface caused by particles is derived, and the influence of the particle size on the wear rate of materials is analysed. With the compressor rotor blade and stator blade of a certain type of turboshaft engine as the research objects, a sand particles impact velocity test bench and a Ti-6Al-4V alloy erosive wear test bench are designed and built. The key parameters which are related to the target material and impact velocity in the expression of wear rate are obtained through the erosive wear experiments under the typical sand particle size. The effects of sand particle size on the erosive wear of compressor rotor blades and stator blades are carried out combined with the gas-solid flow dynamic analysis. The results show that there is an internal relationship between the sand particle size and impact velocity and that a power function relationship exists between the erosive wear rate of materials and the impact velocity of sand particles. Under the experimental condition, when the particle size increases from 177 μm to 423 μm, its impact velocity is reduced by about 17% on average. The wear concentration areas of the compressor rotor blade and stator blade do not change with the sand particle size, but the difference in the wear degree is obvious. Among them, the maximum concentration values of the wear rate caused by 177 μm sand particles on the rotor blade and stator blade increase by 91% and 131%, respectively, compared with those caused by 423 μm sand particles. In conclusion, the above results can provide theoretical reference for anti-wear design of the compressor blades of turboshaft engine.

Key words: erosive wear, gas-solid flow dynamic, sand particle size, turboshaft engine, compressor blade

CLC Number:

TH113

LI Chao, BIN Guangfu, LI Jian, WANG Weimin. Influence of Sand Particle Size on the Erosive Wear of Compressor Blade in an Aero-turboshaft Engine[J]. Journal of Mechanical Engineering, 2022, 58(19): 180-190.

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