对于雨水斗气阻现象的研究与讨论

A Research on Air-chocking Phenomenon of Roof Outlet

围绕雨水斗在某些工况下,从零点液位开始,斗前水深随泄流量增加以近乎正比关系快速上涨的异常情况(以下简称气阻现象)进行了大量的实验研究;在此基础上提出了气阻现象形成的原因,并对气阻的破除进行了分析。气阻现象发生时,雨水斗内流态为水气两相流,其形成与雨水斗的结构、泄水口负压大小相关;增大雨水斗泄水口管径、增长雨水斗尾管长度可以有效缓解或避免气阻现象。

Experiments were conduct to probe into the abnormal phenomenon of roof outler that water head directly proportional to flow-rates（ air-chocking,in short）. With large quantity of experiments conducted,a probable explanation was proposed to this phenomenon,and presented a demonstration theoretically. As a result,air-chocking of roof outlet in relation with the structure of it and the negative pressure of the drain opening. Increasing conduit diameter or lengthen the vertical pipe could remit this phenomenon.