燃气透平静叶微颗粒碰撞和沉积特性的数值分析

Numerical analysis of micro-particle collision and deposition on gas turbine stator blades

中文关键词: 微颗粒  透平静叶  碰撞特性  沉积特性

英文关键词: micro-particle  turbine stator blade  collision characteristics  deposition characteristics

中文摘要:

      基于拉格朗日颗粒追踪模型及EI-Batsh和Haselbacher等人提出的微颗粒沉积模型并结合燃气轮机透平静叶实际运行参数，为研究PM2.5等微颗粒在透平静叶的碰撞和沉积特性，通过计算流体CFD方法，对不同直径的微颗粒横掠透平静叶进行颗粒运动轨迹追踪和沉积情况分析。模拟结果表明：颗粒直径0.1~5.0μm时，碰撞率随颗粒直径的增大而增大，黏附率随着颗粒直径的增大反而减少，沉积率随着颗粒直径的增大先增大后减少；颗粒直径为0.1um时，在叶片背面和压力面都有碰撞和沉积，直径为1.0μm和2.5μm时，沉积和碰撞大都发生在压力面后半部分和前驻点附近，直径为5.0μm时，沉积大都发生在压力面前半部分。

英文摘要:

      In aim to study the deposition characteristics of PM2.5 and other micro-particles in the turbine stator blades,computational fluid dynamics were applied in gas turbine first stator blade with actual operating parameters.Different diameters of micro-particle transport and deposition flow crossing turbine stator blades were numerically calculated based on the Lagrangian stochastic tracking model and particle deposition model proposed by EI-Batsh and Haselbacher. The results illustrate that in the range of particle diameter 0.1-5.0μm,with the increase of particle diameter,particle collision rate rises，however, adhesion rate decreases.Deposition rate rise first and then decresase; Deposition and collision area of particles with diameter 1.0μm and 2.5μm is mainly distributed in the latter part of pressure surface and around stagnation point ;while particles with diameter 0.1μm are collision and deposition in all turbine stator blades surface.Collision area of particles with diameter of 5.0um mainly distributes in the forward section of pressure surface.