摘要
引风机是锅炉运行的重要设备,引风机运行过程中,叶片的积灰与磨损导致叶片质量不平衡而引起振动,从而影响系统的安全性能和运行效率,甚至会引发事故。在最初的引风机设计中,往往只重视其流动特性而忽略磨损特性。如今人们对设备的运维保障日益重视,磨损特性在结构设计与优化中开始显露其重要性。数值仿真已成为结构优化设计的有效手段,磨损特性仿真则必须解决流固耦合问题、气固两相流问题和磨损冲蚀问题等。采用气固两相流模型对引风机磨损特性进行了三维数值仿真,利用基于Tabakoff and Grant冲蚀模型的拉格朗日方法,研究了不同粒径粉尘颗粒及不同质量的粉尘颗粒对引风机叶片的磨损作用情况,总结出粉尘颗粒与引风机叶片之间的作用规律,指出在结构优化和运维保障中要着重于叶片的压力面与前缘区域。
Induced draft fan is important equipment in boilers.During the operation,ash accumulation and abra- sion of blades cause mass Unbalance and vibration,thus affecting the safety and efficiency of the system,and even leading to accidents.In the original design,the wear characteristics are often neglected.Nowadays,people pay more attention to the operation and maintenance of equipments,and wear characteristics begin to show its importance in structural design and optimization.Numerical simulation has become an effective method of structural optimization, and the simulation of wear characteristics must solve the fluid solid coupling problem,the gas-solid two-phase flow problem and the wear erosion problem.The gas-solid two-phase flow model was used to simulate the flow numerically in the induced draft fan.Based on the Lagrange method of Tabakoff and Grant abrasion model,effects of different sizes and different weights of the dust particles on blades of the induced draft fan were investigated.The rule of action between the dust particles and blades of the induced draft fan was summarized.The results point out that the stress and leading edge of the blade should be emphasized in the structural optimization and maintenance.
作者
武翼飞
史伟
WU Yi-fei;SHI Wei(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin 300300,China;Department of Thermal Enginnering,Tsinghua University,Beijing 100084,China)
出处
《计算机仿真》
北大核心
2018年第12期199-203,共5页
Computer Simulation
基金
中央高校基本科研业务费项目(3122017086)
关键词
引风机
气固两相流
磨损率
数值仿真
Induced draft fan
Gas-solid two-phase flow
Abrasion rate
Numerical simulation
