舰船燃气轮机高压涡轮颗粒沉积特性研究

Investigation on Particle Deposition Characteristic of High-Pressure Turbine for Marine Gas Turbine

关键词:  燃气轮机  涡轮叶片  颗粒沉积  沉积模型  气-固两相流

Key words:  Gas turbine  Turbine vane  Particle deposition  Depositional model  Gas-solid two phase flow

摘要:

为了探究典型舰船燃气轮机高压涡轮叶栅通道内部的颗粒沉积分布规律，针对随燃气进入涡轮叶栅通道内颗粒的动力学及颗粒与壁面相互作用的特性，采用数值模拟方法，分析了颗粒撞击涡轮叶片表面后发生黏附与剥离以及沉积与反弹的相互作用影响准则，并比较了临界速度模型和临界黏度模型对于模拟颗粒沉积分布的异同。结果表明，在本文工况条件下，对于临界速度模型而言，叶栅通道内的颗粒沉积效率在颗粒动量Stokes数为0.1～10内发生突变。对于临界黏度模型而言，颗粒沉积效率在动量Stokes数>10后达到了100%。在大粒径下，颗粒是否沉积，前者取决于粒径，后者取决于主流温度。

Abstract:

In order to investigate the particle deposition distribution in the high-pressure turbine cascade channel of a typical marine gas turbine， for the dynamics of the particles entering the turbine cascade channel with the gas and the characteristics of the interaction between the particles and the wall surface， the interaction effect rules of adhesion and peeling， deposition and rebound after the particles impacting the turbine blade surface were analyzed， and the similarities and differences of the critical velocity model and the critical viscosity model for the simulation of particle deposition distribution were compared by using numerical simulation method. The results show that， under the calculation condition of this paper， for the critical velocity model， the particle deposition efficiency in the cascade channel changes abruptly in the range of particle momentum Stokes number of about 0.1 to 10. For the critical viscosity model， the particle deposition efficiency reaches 100% after the momentum Stokes number is greater than 10. For large particle size， whether the particle deposits or not， the former depends on the particle size， the latter depends on the mainstream temperature.