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　　便攜式明渠流量計用于明渠測流量時(shí)，在明渠上安裝量水堰槽。量水堰槽把明渠內流量的大小轉成液位的高低。儀表測量量水堰槽內的水位，再按相應量水堰槽的水位-流量關(guān)系反算出流量。<div>　　之所以可以實(shí)現用液位來(lái)進(jìn)行換算，是因為明渠內的流量越大，液位越高；反之流量越小，液位越低。如果在渠道內安裝幾何尺寸和堰板材料固定的量水堰槽后，流量與液位就建立了確定的對應函數關(guān)系。這樣量水堰槽就把流量測量轉成了易于實(shí)現的水位測量。</div><div>　　便攜式明渠流量計由測量液位的儀表和按計量院公布的文件制作的水箱組成。液位計直接測量通道或水箱中的液位高度，用于明渠流量測量時(shí)，應在明渠上安裝測量堰槽。測量堰槽將明渠中的流量轉換為液位。儀器測量測量堰槽內的水位，然后根據相應測量堰槽的水位與流量關(guān)系計算流量。</div><div> </div><div>　　便攜式明渠流量計在選擇測量堰槽的類(lèi)型時(shí)，應考慮通道內的流動(dòng)情況、通道內水的流動(dòng)形態(tài)以及是否能形成自由流動(dòng)。根據不同的上限流量，可選擇不同的堰槽。</div><div>　　1、當上限流量小于40L/s時(shí)，建議使用直角三角堰；</div><div>　　2、大于40升/秒建議使用巴歇爾槽；</div><div>　　3、上游通道短，上限流量大于40L/s。建議使用矩形堰。</div><div>　　如果條件允許，選擇巴赫爾槽。沖擊槽水位流量關(guān)系由實(shí)驗室標定，對上游渠道條件要求較弱。三角堰和矩形堰的水位流量關(guān)系來(lái)自理論計算，容易因忽略某些使用條件而帶來(lái)附加誤差。</div><p align="center"><img src="https://img71.chem17.com/9/20220113/637776952328613726610.jpg" alt="便攜式明渠流量計" width="475" height="389" align="middle" /></p> </div> <div id="xdxbvbp" class="art-next"> <dl class="shangxia"> <dd>上一篇：<a 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