Water erosion resistant surface treatments

注水来冷却压缩机中的空气，从而增加燃气轮机的功率输出是一种常见的做法。水滴的反复撞击可能会导致沿翼型前缘的显著侵蚀，不仅导致性能下降，而且由于气动不稳定性，还可能导致翼型的高周疲劳失效。因此，有必要开发更耐水侵蚀的压缩机叶片。该项目将包括研究不同材料的水蚀机理，开发耐水蚀涂层，并对这些涂层进行表征和测试。它还将包括水撞击现象的建模。不同大小的水滴在局部撞击表面时提供不同的动能，因此保护涂层应坚硬、坚韧，并提供疏水效果。将研究各种涂层，包括硬纳米结构陶瓷和疏水涂层。研究了涂层的微观结构、力学性能和功能性能。这将包括对基材条件（即微观结构、质地和残余应力）对所得涂层/表面处理的微观结构、性能和耐蚀性的影响的研究。抗冲蚀测试将在按照ASTM G73-04标准（液体冲击冲蚀测试的标准规程）设计的特殊钻机上进行，并调整以模拟压缩机内部的操作条件。在这个测试装置中，可以确定材料和涂层/表面处理的抗侵蚀或其他损坏的能力；研究水滴的大小、速度和频率对损伤机理的影响。通过这种方式，我们将能够研究水侵蚀行为与叶片材料动态力学性能之间可能的相互作用。

Injecting water to cool the air in the compressor hence increasing the power output of the gas turbines is a common practice. Repeated impacts of water droplets maycause significant erosion along the leading edges of the airfoils resulting not onlyin performance degradation but also in potential for high-cycle fatigue failure of the airfoils due to aerodynamic instability. Consequently, there is a need to develop a more water erosion resistant compressor blades. This project will include the studyof water erosion mechanism of different materials, development of coatings resistant to water erosion, characterization and testing of these coatings. It will also include modeling of the water impingement phenomenon. Different sizes of water droplets provide various kinetic energywhile locally hitting the surface, thus protective coatings should be hard, tough and provide the hydrophobic effect. Various coatings will be studied including hard nanostructure ceramic and hydrophobic coatings. The microstructure, mechanical and functional properties of the developed coatings will be studied. This will include the investigation of the effect of substrate conditions (i.e. microstructure, texture and residual stresses) on the microstructure, properties and erosion resistance of the resulting coating/surface treatment. Testing of erosion resistance will be performed on a special rig designed as per ASTM G73-04 standard (Standard Practice for Liquid Impingement Erosion Testing) and adjusted to simulate the operating conditions inside the compressor. Inthis test rig, it will be possible to determine the resistance to erosion or other damage of the materials and coatings/surface treatments; to investigate the damage mechanisms and how theyare influenced bythe size, velocityand frequencyof water droplets. In this way, we will be able to studya possible interaction between water erosion behaviour and dynamic mechanical properties of the blades materials.