CM902WX
CM902WX
CM902WX
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【品牌】Allen-Bradley罗克韦尔、ABB、本特利Bently 3500系统卡件、GE、艾默生西屋等模块卡件
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检定原理 如图1所示, 用真空泵1将空气由被检表的上游直管段入口吸入，经过被检表前直管段、被检表11和被检表下游直管段进入滞止容器8，在滞止容器的下游，有一组音速喷嘴5，控制音速喷嘴下游的开关阀门4，可以任意选择所要开关的音速喷嘴，以达到改变被检表流量的目的，滞止容器需要测温6测压7，代入公式计算可以得到通过音速喷嘴的质量流量，亦即通过被检表处的质量流量。通过测量被检表处的温度10和压力12，可以计算出空气密度，进而得到标准体积流量。流量调节阀9一般只用于开关，也可作为调节流量的辅助手段。在进行小流量检定时，可以不用开启真空泵，只要储气罐2的真空度能够满足要求即可。真空泵的能力应满足下列两个条件：第一，真空泵所提供的流量应大于被检流量计的最大流量；第二，在测量过程中，真空泵所提供的真空度应满足音速喷嘴的临界压力比。
流量计算公式 1. 临界压力比及其计算公式 当气流处于亚音速时，喉部的气体流速将随节流压力比(即出口压力P1与上游滞止压力P0之比)的减小而增大。当节流压力比减小到一定值时，喉部流速达到最大流速----音速，即达到所谓的临界流，此时，如果P0不变，再减小P1(即再减小节流压力比)流速将保持不变，也就是说，流速不再受下游压力的影响。此时的文丘利喷嘴称为音速文丘利喷嘴，又称临界流文丘利喷嘴，此时的节流压力比称为临界压力比。 在理想条件下，即气流是一维流动、等熵、完全气体，则从理论上可导出临界压力比的计算公式：
式中，k----气体等熵指数，对于完全气体，k等于比热比。 对于空气，k=1.4，则(P1 /P0)= 0.528 2. 理想条件下的质量流量 在理想条件下, 音速文丘利喷嘴的质量流量公式：
式中，qmi ---- 音速文丘利喷嘴在理想条件下的质量流量(kg/s) A* ---- 音速文丘利喷嘴的喉部面积(m2) C*i ---- 气体在理想条件下的临界流函数
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