(1)節(jié)流件前后的直管段必須是直的，不得有肉眼可見(jiàn)的彎曲。(2)安裝節(jié)流件用得直管段應(yīng)該是光滑的，如不光滑，流量系數(shù)應(yīng)乘以粗糙度修正稀疏。(3)為保證流體的流動(dòng)在節(jié)流件前1D出形成充分發(fā)展的紊流速度分布，而且使這種分布成均勻的軸對(duì)稱形，所以：1) 直管段必須是圓的，而且對(duì)節(jié)流件前2D范圍，其圓度要求其甚為嚴(yán)格，并且有一定的圓度指標(biāo)。具體衡量方法：(A)節(jié)流件前OD，D/2，D，2D4個(gè)垂直管截面上
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2010年5月18日
新買(mǎi)的孔板流量計(jì)如何調(diào)試？
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