产品概述
环形文丘里流量计（Annular Venturi Meter）
环形文丘里流量计是一项专利技术，可在很宽的雷诺数范围内，针对各种工况和流体准确测量流量。它利用管道内流体流动的能量守恒原理，在物理原理上与其他差压式流量计相同。
但其出色的性能特性来源于独特的设计。位于管道中心的锥体与流体相互作用，重塑流速分布，并在锥体紧下游形成低压区。
静压（管线压力）与锥体下游形成的低压之差由两个取压口测得。一个取压口位于锥体稍上游处，另一个位于锥体下游面本身。将该差压代入伯努利方程即可求得流量。
由于锥体位于管线中心，测量点处的流速分布得到优化，因而无论上游流动条件如何，都能准确、可靠地测量流量。
English description
The Annular venturi meter is a patented technology that accurately measures flow over a wide range of Reynolds numbers, under all kinds of conditions and for a variety of fluids. It operates on the same physical principle as other differential pressure-type flowmeters, using the theorem of conservation of energy in fluid flow through a pipe. The Annular venturi meter remarkable performance characteristics, however, are the result of its unique design. It features a centrally-located cone inside the tube. The cone interacts with the fluid flow, reshaping the fluid's velocity profile and creating a region of lower pressure immediately downstream of itself. The pressure difference, exhibited between the static line pressure and the low pressure created downstream of the cone, can be measured via two pressure sensing taps. One tap is placed slightly upstream of the cone, the other is located in the downstream face of the cone itself. The pressure difference can then be incorporated into a derivation of the Bernoulli equation to determine the fluid flow rate. The cone's central position in the line optimizes the velocity profile of the flow at the point of measurement, assuring highly accurate, reliable flow measurement regardless of the condition of the flow upstream of the meter.
