一、前言节流式流量计(节流元件用孔板、喷嘴或文氏管)根据伯努利定理通过压力测量来求流量,但在实践中要受到流体粘性等的影响,故确定出对理论公式进行修正的系数(流量系数)是必要的。这个流量系数 C 必须由实验精密测得。现在 ISO 标准与 JIS 标准中的流量系数都是 I. Introduction Throttle flow meter (throttling element orifice, nozzle or venturi) according to Bernoulli’s theorem through the pressure measurement to seek flow, but in practice to be fluid viscosity and so on, so to determine the right The coefficient of correction of the theoretical formula (flow coefficient) is necessary. This flow coefficient C must be measured experimentally. Now ISO standard and JIS standard flow coefficient are