减小水槽尾部流态影响的新型孔板尾门研究

Study on a New Orifice Tail Gate to Reduce Influence upon Flow Regimen at the End of Flume

通过几种常用水槽尾门对水槽尾部流态影响的分析 ,结合流速分布对数公式和小孔口自由出流公式 ,推导出一种新型斜拉孔板尾门开设孔径的计算公式 ,经验证 ,用该公式设计的新型斜拉孔板尾门对水槽尾部的流态影响较小 ,在水槽总长度不变的前提下 。

Through analyses of the influence of several commonly-used tail gates upon their flow regimens at their tail segments, and combining the formula of logarithm velocity distribution and that of free discharge from small orifices, a formula of calculating the orifice diameter in a new inclined dragging tail gate was deduced. It was validated that the new designed gate has less influence upon its flow regiment at the tail segment and the effective working length of the flume can be increased without increassing its total length.