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二、如圖一所示,一穩定的喷射水流自一直徑為12 mm的水平水管中喷出,衝上一塊重 量為12 N的均質方塊(寬、高、長分別為30 mm、160 mm、200 mm),水流的衝 擊點位在長度方向的中線上。
問題詳情
二、如圖一所示,一穩定的喷射水流自一直徑為12 mm的水平水管中喷出,衝上一塊重 量為12 N的均質方塊(寬、高、長分別為30 mm、160 mm、200 mm),水流的衝 擊點位在長度方向的中線上。水流在水管中及在喷出口的速度呈拋物線分布,如圖 二所示。此喷射流恰可把方塊推倒,試求出水流在水管内的最大流速Uc,以及水管 内每1 m距離的壓力差。(20分)
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