同心扬水三泵站出水渡槽改造后水面线分析计算

Analysis and calculation of the water surface profiles of the outlet aqueducts reconstruction in the No.3 pump-station of Ningxia Tongxin

为了分析同心扬水三泵站出水渡槽在加固维修后,出现水流紊乱的原因,采用迭代法计算渡槽正常水深和临界水深,并且实现了自动计算和自动判断水面线形状以及推求水面线的程序.通过对渡槽内水面线进行计算并与实测水深比较,得出两者误差较小、吻合较好.根据计算和分析结果表明,加固维修第17节和23节槽壳后,使得槽内水流紊乱,并且部分槽壳行水断面不够.因此,建议更换第17节和23节槽壳,以使渡槽中的水流平顺通过,满足下游灌溉需水流量的要求.

The study was to seek iterative formula of normal water depth and critical water depth of the outlet aqueducts in the NO.3 pump-station. Main reasons of the turbulence flow in the aqueducts are analyzed. Normal water depth and critical water depth of the aqueducts are computed by using iteration method. The types of water surface profiles are confirmed. So, water surface profiles of the outlet aqueducts are computed using partition summation method. Through comparing calculation results with experiment datas, it shows that its fit well. The procedure is short-cut and correct. In order to flow smoothing and satisfy downstream irrigation, proposed to replace section 17 and 23 shells of the aqueducts.