如圖所示突然放大有壓管流,放大前細(xì)管直徑d1=100mm,放大后粗管直徑d2=200mm,若放大后斷面平均流速v2=1m/s,則局部水頭損失hm為:()
A.0.613m B.0.556m C.0.459m D.0.343m
A.0.0261 B.0.0617 C.0.0452 D.0.0551
矩形斷面輸水明渠如圖所示,斷面尺寸為2m×1m,渠道的謝才系數(shù)C=48.5m1/2/s,輸水1000m長度后水頭損失為1m,則斷面平均流速v為:()
A.1.511m/s B.1.203m/s C.0.952m/s D.1.084m/s