涡轮叶片复杂油冷通道表面涂层处理及抑焦性能研究

涡轮叶片耐高温性能是航空发动机动力提升的关键，采用燃油冷却涡轮叶片的开创性冷却方法，可以大幅提升安全工作温度，但针对燃料高温裂解产生的表面结焦亟需开展关于惰性涂层的系统性研究。本项目研究内容包括：采用TiCl4-N2-H2和TiCl4-H2-CO2作为原料，开展TiN和TiO2涂层化学气相沉积的热、动力学研究；针对涡轮叶片复杂微孔冷却通道，开展气体流动特性CFD模拟；采用模拟真实冷却通道的复杂管网结构，获取反应体系的沉积时间、温度和流量配比等工艺参数，并建立涂层性能的系统检测方法；根据涡轮叶片所处的温度和压力条件，开展RP-3航空煤油裂解结焦的电加热管实验，阐明温度、压力和反应时间等条件对燃料表面结焦种类和结焦量的影响机制；开展电加热涂层管的对比实验，阐明涂层性能对抑焦效果的影响机制。最终，为涡轮叶片的抑焦涂层制备提供理论和技术支撑，提升我国在航空发动机研制方面的地位和创新能力。

The temperature resistance of the turbine blade is the key for the improvement of power performance of the aero-engine in the next generation. The method with using the fuel to cool the high-temperature material can raise the safe working temperature of the turbine blade. Aiming at the surface coking accompanying with the fuel pyrolysis, the systematical research should be carried out on the topic of inert coating. The contents in this project include: with the raw material supply system of TiCl4-N2-H2 and TiCl4-H2-CO2, the thermodynamical and kinetical study for the chemical vapor depositon of TiN and TiO2 coating will be carried out; Aiming at the complex cooling micro-channel in the turbine blade, the CFD simulation will be carried out to analyze the flow characteristic; Adopting the complex tube network with the similar size parameters of the cooling channels in turbine blade, the CVD experiments will be carried out to achieve the technological parameters of deposition time, temperature and flow proportioning, and the systemically detecting methods will be established for the coating characteristics; According to the temperature and pressure condition of the turbine blade, the electric heating tube experiments will be carried out for the pyrolysis and coking of RP-3 aviation fuel in the blank tube and the influence mechanism of the reaction conditions on the types and amount of the surface coking will be illustrated; The comparative experiment for the coated tube will be carried out to make clear the inhibiting coking mechanism of the coating. Finally, the research work of this project will support the preparation of the anti-coking coating for the turbine blade, and improve the international standard and innovation ability in the field of aero-engine.