的工作原理 Working principle of vortex flowmeter
A vortex generator (blocking fluid) is set in the fluid, and regular vortices are alternately generated from both sides of the vortex generator. This vortex is called a Kaman vortex street (see Figure 1). The vortex array is asymmetric downstream of the vortex generator. To arrange. According to the Kaman vortex principle, there are the following relations:
In the formula, m is the ratio of the arched area on both sides of the vortex generator to the cross-sectional area of the pipe; D is the surface diameter; d is the width of the vortex generator; Velocity; Sr is the Strouhal number; U is the average velocity of the measured medium flow.
具有以下一些特点： Vortex flowmeter has the following characteristics:
① The output is a pulse frequency whose frequency is directly proportional to the actual volumetric flow of the measured fluid and is not affected by the composition, density, pressure and temperature of the fluid;
②Wide measurement range, the general range can reach more than 10: 1;
③ The accuracy is medium to upper level;
④ No moving parts, high reliability;
⑤Simple and firm structure, easy installation and low maintenance cost;
⑥ Wide range of applications, applicable to liquid, gas and steam.