新型生物质颗粒回转燃烧器流动特性仿真分析

Modeling and analysis on flow characteristics for a new type biomass pellet rotary burner

以新型生物质颗粒回转燃烧器为研究对象,采用Pro/E软件对生物质颗粒回转燃烧器内流体进行几何建模,并用Gambit软件对模型应用非结构化网格生成技术划分网格,并进行有限元前处理.在采用k-ε湍流模型的基础上,应用计算流体力学软件Fluent模拟稳定工况下回转燃烧器内流体的流动特性,分析进气速度对回转燃烧器内的压力分布、速度分布以及湍动能分布的影响.结果表明:燃烧器内部的气体压力、速度和湍动能随风机引风速度的增大逐渐增大,风机出口到回转燃烧室之间的气体压力、速度和湍动能较大,在二次风口处达到最大值,回转燃烧室内气体的压力、速度和湍动能分布较为均匀.

A new type of biomass pellet rotary burner was chosen as research object,and the geometrical model was established by Pro/E software.The fluid finite element model of biomass pellet rotary burner was meshed by unstructured mesh generation technique and pre-processed by Gambit software.Based on the k-εturbulence model,the flow characteristics of rotary burner were simulated by Fluent software,and the effects of pressure distribution,velocity distribution and turbulent kinetic energy distribution in the rotary burner were analyzed.The results show that the pressure,velocity and turbulent kinetic energy of burner are increased with the increasing of wind speed at the inlet of burner,while the pressure,velocity and turbulence kinetic energy between burner inlet and rotary combustion chamber are greater than those in other areas.The maximum values are obtained at secondary air,and the pressure,velocity and turbulent kinetic energy distribution of rotary combustion chamber are uniformly distributed.