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動力専門基礎 電力版教材 ポンプの問題

2016-07-03View Original

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第3章の課後練習問題72では、後葉型遠心ポンプのインペラについて、回転速度n1=1750RPM、羽根の出口取付け角が60度、出口直径D=150mm、厚さb=15mm、流量が20L/sの場合の理論的な揚程を求める 答えの中で、Vr2、つまり出口の実際の流速の半径方向成分を求める際にQ=Π*D*b*Vr2となっているが、Π*D*bがどうして出口直径の表面積として表されるのか理解できない 大神にお答えいただけますように。

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