切向炉内多组小屏尾部分离涡的研究  

An Experimental Study of Separated Vortices at the Tail Section of Multi-platenlets in a Tangentially Fired Furnace

作　　者：刁永发[1] 何伯述[1] 许晋源[2] 陈昌和[1] 

机构地区：[1]清华大学煤的清洁燃烧国家重点实验室,北京100084 [2]西安交通大学能源与动力工程学院,陕西西安710049

出　　处：《热能动力工程》2003年第2期151-154,共4页Journal of Engineering for Thermal Energy and Power

基　　金：机械工业技术发展基金资助项目 (95JB110 1) ;国家重点基础研究基金资助项目 (G19990 2 2 2 ) ;中国博士后科学基金资助项目 (2 0 0 2 -0 7)

摘　　要：利用IFA30 0恒温式热线风速仪 ,首次使用三维可移坐标架给六线涡量探针定位 ,并用伺服电机驱动其固定座 ,采用条件采样技术测量了引进型切向燃烧煤粉炉内多组小屏尾部的涡量场。将多组小屏比拟为薄板机翼 ,研究了由于上升气流螺旋形流动和绕流过薄板翼的复合结果 ,在多组小屏尾部形成的分离涡 ,确定了分离涡的大小。研究发现 :分隔屏 (前屏 )区尾部 ,炉膛右半部分有明显的分离涡 ,并且有些分离涡伴有方向相反的另一涡出现。速度场和涡量场的测量结果表明 :右侧墙附近 ,不仅流速高 ,而且涡度大 ,为研究炉内煤粉燃烧及NOxBy using a IFA300 constant temperature hot wire anemometer a six sensor vortex probe was localized for the first time with the help of a three dimensional movable coordinate stand. Meanwhile, a servomotor was used to drive its fixed base. The vorticity field at the tail section of the multi platenlets in the foreign made tangentially fired pulverized coal furnace was measured by the use of a condition sampling technique. With the multi platenlets being assumed as thin plate airfoils investigated were the separated vortices resulting from the combined action of spiral ascending gas flows and the flows past the thin plate airfoils. The magnitude of the separated vortices was determined. The results of an experimental study indicate that there exist evident separated vortices at the tail section of a separated platen (front platen) and at the right half of the furnace. Furthermore, some of the separated vortices have been accompanied by other vortices assuming an opposite direction. The measurement results of velocity field and vortex field show that in the neighborhood of a right lateral wall there emerged not only a high flow speed but also a high degree of vorticity. All the above has provided a theoretical basis for the study of in boiler pulverized coal combustion and NOx emission control technology.

关 键 词：切向炉 多组小屏 螺旋上升流 薄板翼 分离涡 六线涡量探针 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程] O357.1[理学—流体力学]