Particulate deposits in aero-engine turbines change the profile of blades, increase the blade surface roughness and block internal cooling channels and film cooling holes, which generally leads to the degradation of aerodynamic and cooling performance. To reveal particle deposition effects in the turbine, unsteady simulations were performed by investigating the migration patterns and deposition characteristics of the particle contaminant in a one-stage, high-pressure turbine of an aero-engine. Two typical operating conditions of the aero-engine, i.e. high-temperature take-off and economic cruise, were discussed, and the effects of particle size on the migration and deposition of fly-ash particles were demonstrated. A critical velocity model was applied to predict particle deposition. Comparisons between the stator and rotor were made by presenting the concentration and trajectory of the particles and the resulting deposition patterns on the aerofoil surfaces. Results show that the migration and deposition of the particles in the stator passage is dominated by the flow characteristics of fluid and the property of particles. In the subsequential rotor passage, in addition to these factors, particles are also affected by the stator–rotor interaction and the interference between rotors. With higher inlet temperature and larger diameter of the particle, the quantity of deposits increases and the deposition is distributed mainly on the Pressure Side (PS) and the Leading Edge (LE) of the aerofoil.

中文翻译：

---

航空发动机一级涡轮中飞灰颗粒迁移和沉积的非定常模拟

航空发动机涡轮机中的颗粒沉积物会改变叶片轮廓，增加叶片表面粗糙度，堵塞内部冷却通道和薄膜冷却孔，这通常会导致气动和冷却性能下降。为了揭示涡轮中的颗粒沉积效应，通过研究航空发动机的一级高压涡轮中颗粒污染物的迁移模式和沉积特性进行了非定常模拟。讨论了航空发动机高温起飞和经济巡航两种典型工况，并论证了粒径对飞灰颗粒迁移和沉积的影响。应用临界速度模型来预测粒子沉积。通过展示颗粒的浓度和轨迹以及由此产生的机翼表面沉积模式，对定子和转子进行了比较。结果表明，定子通道中颗粒的迁移和沉积受流体的流动特性和颗粒的性质支配。在后续的转子通道中，除了这些因素外，颗粒还受到定子-转子相互作用和转子间干扰的影响。随着入口温度的升高和颗粒直径的增大，沉积物的数量增加，沉积物主要分布在翼型的压力侧（PS）和前缘（LE）。结果表明，定子通道中颗粒的迁移和沉积受流体的流动特性和颗粒的性质支配。在后续的转子通道中，除了这些因素外，颗粒还受到定子-转子相互作用和转子间干扰的影响。随着入口温度的升高和颗粒直径的增大，沉积物的数量增加，沉积物主要分布在翼型的压力侧（PS）和前缘（LE）。结果表明，定子通道中颗粒的迁移和沉积受流体的流动特性和颗粒的性质支配。在后续的转子通道中，除了这些因素外，颗粒还受到定子-转子相互作用和转子间干扰的影响。随着入口温度的升高和颗粒直径的增大，沉积物的数量增加，沉积物主要分布在翼型的压力侧（PS）和前缘（LE）。