起旋器出口断面流速分布与起旋效率

通过对 6种起旋器、4种流量工况的试验 ,对起旋器出口断面流速分布及起旋效率进行了分析。结果表明 ,起旋器出口断面轴向流速分布呈类对数型分布 ,它比平直流的流速分布更均匀 ,可以用平直流速分布公式与一个二次尾流函数来表示 ;起旋器出口断面周向流速分布在主流区近似呈线性分布。提出了起旋器的起旋效率计算式 ,公式表明要提高起旋效率 ,则必须减小阻力损失 ,即应对起旋器结构参数进行优化

Outlet cross section velocity distribution and rotation efficiency of spiral pipe flow generator

The cross section axial velocity distribution at outlet and rotation efficiency of the spiral flow generator are analyzed in this paper,based on the experiment data of 6 spiral flow generators at 4 flow rates.The cross section axial velocity distribution at outlet of the spiral flow generator is a logrithm like function,which can be expressed by a velocity distribution fomula of 2 D pipe flow and secondary wake flow function,and more uniform than that of 2 D pipe flow.The cross section circumfential velocity distribution at outlet of the spiral flow generator is a liner function.The rotation efficiency fomula is then suggested.In order to raise the rotation efficiency of spiral flow generator,its resistance must be reduced by optimizing its structure parameters.