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一、涡街流量计的工作原理及测量方法涡街流量计的工作原理是在流体中设置漩涡发生体,从而发生体两侧交替地产生有规则的漩涡,漩涡列在漩涡发生体下游非对称地排列,发生一定的频率,通过以下公式即可得出流速:f=St×v/(1-1.27d/D)×d式中:St——斯特劳哈尔数,为无量纲数,与漩涡发生体及雷诺数有关;v——流速;d——发生体迎面宽度;D——公称通径。临界流文丘里喷嘴由一个光滑的圆形入口部分收敛到最低咽喉区,气体通过喷嘴时,其速度增加,它的密度减小。在喉部,最小面积达到所需的音速
First, the vortex flowmeter working principle and measurement method Vortex flowmeter working principle is to set the vortex in the fluid body, which occurred on both sides of the body alternately produce regular vortex, vortex in the vortex downstream body asymmetry To arrange a certain frequency, the flow rate can be obtained by the following formula: f = St × v / (1-1.27d / D) × d Where: St-- Strouhal number, , And the occurrence of vortex and Reynolds number; v-- flow rate; d - Occurrence body width; D - nominal diameter. The critical flow venturi nozzle converges to the lowest throat area by a smooth circular inlet. As gas passes through the nozzle, its velocity increases and its density decreases. At the throat, the minimum area achieves the required speed of sound