起旋器出口断面流速分布与起旋效率

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

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 。

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.