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工芸基礎知識(選択問題)20180529

2018-05-30View Original

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以下の状況は、ポンプの吸込圧を上昇させるものである。 A. 吸入フィルターの目詰まり B. 吸入バルブの閉じ具合が悪い C. 吸上高さが増大する D. 流出高さが増大する
ヒント:吸込圧力頭=吸込液面の圧力頭-(吸上高さ+吸込速度頭+吸込管の抵抗による水頭)。不安定な流れの場合は、慣性水頭も差し引く必要がある。流注高さは負の吸上高さに相当する。

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