旋流强度对燃烧器出口附近颗粒碰撞数的影响  

Effect of swirl number on the number of particle impactsnear a swirl burner outlet

作　　者：周勇[1] 由长福[1] 李金平[1] 岳光溪[1] 

机构地区：[1]清华大学热能工程系热能动力工程与热科学重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2005年第2期212-215,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"九七三"重点基础研究项目(G19990222)

摘　　要：为了解决电站锅炉炉膛结渣的问题,研究了对结渣有重要影响的颗粒碰撞数受二次风旋流强度影响的规律。利用相位多谱勒仪(PDA)测量了旋流燃烧器模型出口流场,用以验证同工况下的计算结果,比较结果表明,气流的平均速度在燃烧器出口能很好地符合。在此基础上,数值计算了不同内二次风旋流强度下燃烧器出口的流场,并用随机轨道模型对流场进行后处理,计算颗粒碰撞数。结果表明,颗粒碰撞数占总颗粒数比例很小。颗粒碰撞数与内二次风旋流强度大小成反比。旋流强度大时,颗粒碰撞数小。The effect of the secondary air swirl number on the number of particle impacts which affects slagging was studied to reduce slagging in utility boilers. The flow field was measured using PDA to validate the numerical simulations. The simulations agree well with the experimental data near the burner outlet. The flow field near a single burner outlet was then analyzed for various inner secondary air swirling numbers with the stochastic separated flow model as a postprocessor to calculate the particle impacts. The computation results indicate that total number of particle impacts is relatively small and that the number of impacts is inversely proportional to the swirl number.

关 键 词：炉膛结渣 旋流燃烧器 颗粒碰撞 数值计算 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]