摘要
内置涡核破碎翼旋风分离器具有维持较高效率同时降低阻力的特点。研究其内部颗粒受力情况对揭示其工作机理有重要意义。利用计算流体力学方法(CFD),采用雷诺应力模型(RSM)模拟流场,在此基础上,应用拉格朗日离散化模型(DPM)对传统Lapple型旋风分离器加设涡核破碎翼前后的内部颗粒进行追踪,并对其进行受力分析。结果表明:内置涡核破碎翼旋风分离器在颗粒分离时间及受力在数值上均与传统分离器有所差别;涡核破碎翼叶片较短时,径向合力主要表现为向外,离心力占主导作用,利于颗粒收集;叶片较长时,颗粒受到气流扰动作用加剧,径向上的运动随机性增加从而不利于分离。
A cyclone separator with vortex core broken wings can maintain relatively high efficiency and reduce energy consumption. Thus,it is important to study the force on particles in this device to reveal its mechanism.In this research,the motion of solid particles in a cyclone separator was studied using computational fluid dynamics. The Reynolds stress model was used to simulate the turbulent flow of a gas,and the outcomes from such were used in the simulation of the motion of the particles by adopting the stochastic Lagrangian discrete phase model in a Lapple type cyclone with and without vortex core broken wings. The residence time and force magnitude of the particles in the two types of cyclones were different. When the vortex core broken wings were relatively short,the centrifugal force played a dominant role,and the radial total forces were directed outward,resulting in high collection efficiency. When the wings were long,the effect of gas turbulence on the particles was significant,causing more random motion,which resulted in low efficiency.
出处
《环境工程学报》
CAS
CSCD
北大核心
2017年第1期465-472,共8页
Chinese Journal of Environmental Engineering
关键词
旋风分离器
涡核破碎翼
计算流体力学(CFD)
颗粒受力
cyclone separator
vortex core broken wings
computational fluid dynamics（CFD）
force on particles
