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首页> 外文期刊>The Aeronautical Journal >Unsteady simulations of migration and deposition of fly-ash particles in the first-stage turbine of an aero-engine
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Unsteady simulations of migration and deposition of fly-ash particles in the first-stage turbine of an aero-engine

机译：航空发动机第一阶段涡轮机中的迁移和粉煤灰粒子沉积的不稳定模拟

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摘要

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.
机译：空气发动机涡轮机中的颗粒状沉积物改变叶片的轮廓，增加叶片表面粗糙度和块内部冷却通道和薄膜冷却孔，这通常导致空气动力学和冷却性能的劣化。为了揭示涡轮机中的粒子沉积效果，通过在空闲发动机的一级高压涡轮机中研究颗粒污染物的迁移模式和沉积特性来进行不稳定的模拟。讨论了航空发动机的两个典型操作条件，即高温起飞和经济巡航，并证明了粒度对粉煤灰颗粒迁移和沉积的影响。应用临界速度模型来预测颗粒沉积。通过呈现颗粒的浓度和轨迹和在机翼表面上的所得沉积图案来制造定子和转子之间的比较。结果表明，定子通道中颗粒的迁移和沉积由流体的流动特性和颗粒的性质为主。在随后的转子通道中，除了这些因素之外，颗粒也受到定子 - 转子相互作用的影响和转子之间的干扰。具有较高的入口温度和粒径较大的颗粒，沉积物的量增加并且沉积主要分布在压力侧（PS）和机翼的前缘（LE）上分布。

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