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電廠單機節流孔板

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電廠單機節流孔板

詳細介紹

電廠單機節流孔板的作用,就是在管道的適當地方將孔徑變小,當液體經過縮口,流束會變細或收縮。流束的最小橫斷面出現在實際縮口的下游,稱為縮流斷面。在縮流斷面處,流速是,流速的增加伴隨著縮流斷面處壓力的大大降低。當流束擴展進入更大的區域,速度下降,壓力增加,但下游壓力不會完全恢復到上游的壓力,這是由于較大內部紊流和能量消耗的結果。如果縮流斷面處的壓力pvc降到液體對應溫度下的飽和蒸汽壓力pv以下,流束中就有蒸汽及溶解在水中的氣體逸出,形成蒸汽與氣體混合的小汽泡,壓力越低,汽泡越多。如果孔板下游的壓力p2仍低于液體的飽和蒸汽壓力,汽泡將在下游的管道繼續產生,液汽兩相混合存在,這種現象就是閃蒸。如果下游壓力恢復到高于液體的飽和蒸汽壓力。

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電廠單機節流孔板

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關鍵詞:單機節流孔板,單機節流孔板價格,單機節流孔板廠家

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