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第37卷第6期 2010年11月
华北电力大学学报
Joumal of North China Electrie Power University
Vol. 37,No. 6 Nov.，2010
燃油增压锅炉配风器三维流动特性数值计算
宋晨希，杨冬，罗毓珊，李征
（西安交通大学动力工程多相流国家重点实验室，陕西西安710049）
摘要：采用RNGk=&模型，对船用燃油增压锅炉配风器流场进行了三维冷态数值模拟研究。将常温常压工况下的数值计算结果与PIV试验值进行了对比，两者结果的一致说明了计算模型的正确性。用此计算模型计算并对比了100%BMCR和50%BMCR两个工况下的流场，结果表明：垂直轴的截面上无量纲切向速度与无量纲轴向速度分布呈“M”型，但受稳始器小孔非轴对称性的影响，无量纲切向速度轴对称性不强。相对于 100%BMCR工况，50%BMCR工况回流区轴向和径向尺寸分别下降1.59%、4.55%，最大回流速度下降 53%，压损下降75%。两工况下压降的模拟计算值与经验公式计算值均一致，计算结果为配风器的设计和优化运行提供参考依据。
关键调：燃油锅炉；配风器；数值模拟；流场；回流区
中图分类号：TK224.2
文献标识码：A
文章编号：10072691（2010）060074-07
Threedimensionalnumericalresearchofairdistributed
organ in oil-fired supercharged boiler SONG Chen xi,YANG Dong, LUO Yu-shan, LI Zheng
(State Key Laboratory of Multiphase Flow, Xian Jiaotong University， Xi'an 710049, China)
Abstract: RNGx = e model was employed to simulate the three dimensional flow field of the marine oil fired boiler The results of numerical computation which was taken under the normal condition ( 0. 101MPa, 20°C ) were compared with PIV experimental results. The agreement of radial scale and pressure drop proved the reliability of the computation model used in this paper. This model was then applied in the running conditions : 100% BMCR and 50% BMCR. On the plane perpendicular to axis, they both have the similar M shaped dimensionless tangential and axial velocity profile But there is weak symmetry for tangential profile due to the asymmetrical distribution holes in the bluff body. Com-pared with 100% BMCR, the axial and radial scale of 50% BMCR decreased by 1. 59% and 4. 55% , the maximum re flux speed decreased by 53% , and the pressure drop decreased by 75%, The pressure drop computed by simulation agreed well with empirical formula results. This paper can provide reference for the design and optimization of the air distributed organ.
Key words : oil fired boiler; air distributed organ; numerical simulation; flow field; recirculation zone
锅炉本体多配国外的燃烧器。因此，进口燃烧器国
引言
燃油锅炉是舰艇、商船队的重要动力设备。国
产燃油锅炉本体制造已居世界先进水平，但其燃烧器的工艺水平和燃料供应系统差距较大。目前国内
收稿日期：2010-07-13
V900）一十，
03B0203)
产化，对降低国产油炉制造成本具有重大的现实意义，是今后发展燃油锅炉的必然趋势]。
目前国内关于煤粉锅炉燃烧器流场的数值模拟做了大量工作(2-4)，对燃油锅炉燃烧器的数值模拟文献较少，特别是增压锅炉。
配风器是燃油锅炉的关键部位，它主要是将助燃空气合理导入炉膛与雾化燃油及时充分混合，在油燃烧器出口组织大小和位置适当的高温烟气回流区以利于稳定着火。配风器回流区的大小和