圖示流量Q=36L/s的水平射流,被垂直于流向的水平平板阻擋,截去流量Q1=12L/s,并引起其余部分射流向左偏轉(zhuǎn),不計阻力,則偏轉(zhuǎn)角θ為:()
A.20° B.30° C.40° D.45°
水由圖示噴嘴射出,流量Q=0.4m3/s,噴嘴出口流速v2=50.93m/s,噴嘴前粗管斷面流速v1=3.18m/s,總壓力P1=162.33kN,噴嘴所受到的反力大小Rx為:()
A.143.23kN B.110.5kN C.121.41kN D.150.52kN
圖示平底單寬渠道閘下出流,閘前水深H=2m,閘后水深h=0.8m,不計水頭損失,則閘后流速v2為:()
A.4.14m/s B.3.87m/s C.6.11m/s D.5.29m/s