摘要
涡轮分级机内腔流场的研究是一个非常复杂而又重要的问题 ,针对 FW-15 0型强制涡卧式涡轮分级机的内腔流场 ,利用最新的 CFD技术 ,建立起分级机叶片间的三维旋转流场模型 ,分别进行了叶片形状为直型和带后弯导板型时的数值模拟计算。结果表明 ,当采用后弯导板的叶片形状时 ,混合气流通过两叶片间流场会产生一种正方向的涡旋 ,它可以抵消使用直叶片时由于涡轮高速旋转而不能克服的附加反方向涡旋 ,从而使流场更加稳定 ,容易形成整流。该研究为开发适合亚微米级的高效精密分级机提供了一定的理论依据。
The research is a difficult yet important one that studies on the complex flow field of the inner cavity in a turbine. This thesis studies the inner cavity flow field of FW-φ150 compelling vortex horizontal turbine classifier which adopts the latest CFD technique. This establishes the model of the 3-D rotational flow field between the two blades of the classifier. The shape of the blades which are the straight-shaped and as backward crooked elbow-shaped are analytical calculated. The result shows that when the backward crooked elbow blades are used,the mixed current that passed through the two blades produces a vortex in the positive direction. This vortex counteracts the attached vortex in the opposite direction,which exists due to the high-speed rotation in the flow field which cannot be removed when in use of the straight blades. Thus the flow field is more steady and easy to form the whole stream. This research provides definite theoretical evidences for cultivating a suitable sub-micron classifier with high efficiency and accuracy.
出处
《武汉理工大学学报》
CAS
CSCD
2004年第5期71-73,共3页
Journal of Wuhan University of Technology
关键词
涡轮分级机
数值仿真
旋转流场
turbine classifier
numerical simulation
rotational flow field
