短杆型底格栅水力特性研究

The diversion characteristics of short-bar grille-bottom

底格栅试验中观察发现,格栅廊道水流前缘的边墙是阻水的关键部位,因此提出了栅条长度可缩短1/4的体型,即短杆型底格栅,对其水力特性试验的研究表明,取水流量基本上未因格栅长度缩短而明显减少,格栅的刚度成倍提高.针对现有的取水流量计算公式不便使用,文中给出了直接用来流流量计算取水流量的显式表达式,并给出了完全取水和极限取水单宽流量公式及卡栅影响系数等.

The observation on water diversion of grille-bottom showed that the key part of blocking water was the front wall, so the optimization style was introduced with the grille length reduced to 3/4 of the conventional style, that is the short-bar grille-bottom, and the diversion characteristics showed that water diversion was hardly reduced while the rigidity of grille was greatly improved. To overcome the inconvenience of using existed formula to calculate diversion discharge, the paper introduced the explicit formula that the diversion discharge can be directly computed from the inflow, and the complete diversion discharge,maximum diversion discharge, effect of caulking were also introduced.