CKAS-FLVJ-S智能数字涡街流量计（CKAS-FLVJ-SIntelligent digital vortex flowmeter）

涡街流量计用于测量满管状态下的气体、蒸汽和液体，测量是基于卡门旋涡原理。当介质以一定速度流过三角柱时，在三角柱体两侧后面产生一个交替排列的旋涡带，称之为"卡门旋涡"，由于旋涡发生体两侧交替产生旋涡，于是在发生体两侧产生压力脉动，从而使检测体产生交变应力，封装在检测探头体内的压电元件在交变压力的作用下，产生与旋涡同频率的交变电荷信号，经前放大器放大，送至智能流量计算仪进行智能化处理，实现流体瞬时流量、累积流量的显示及流量数据与微机系统的通讯和控制。

The vortex flowmeter is used to measure gas, steam and liquid in a full pipe state, and the measurement is based on the Karman vortex principle. When the medium flows through the triangular column at a certain velocity, an alternately arranged vortex belt is generated behind both sides of the triangular column, which is called "Karman vortex". Since vortices are alternately generated on both sides of the vortex generator, pressure pulsations are generated on both sides of the generator, so that alternating stress is generated in the test object. The piezoelectric elements encapsulated in the test probe are under the action of alternating pressure. The alternating charge signal with the same frequency as the vortex is generated, amplified by the pre-amplifier, and sent to the intelligent flow calculator for intelligent processing, so as to realize the display of instantaneous flow and cumulative flow of fluid and the communication and control of flow data with the microcomputer system.

在一定雷诺数范围内(2×10^4~7×10^6)旋涡的释放频率f与流体速度V及旋涡发生体的迎流面宽度d之间关系，可用下式表示：

In a certain Reynolds number range (2×10^4~7×10^6), the relationship between the release frequency f of the vortex and the fluid velocity V and the width d of the flow-facing surface of the vortex generator can be expressed by the following formula:

式中f-卡门旋涡的释放频率，Sr-系数(称为斯特劳数)，V-流速，d-三角柱的宽度。斯特劳哈尔数是涡街流量计的重要系数。在曲数的Sr=0.16的平直部分，所以只要准确测出频率f，就可用测出流体流速V=f•d/Sr，从而达到测量管道内流体流量的目的；

Where f-the release frequency of Karman vortex, Sr-the coefficient (known as the Strouhal number), V-the flow velocity, and d-the width of the triangular column. Strouhal number is an important coefficient of vortex flowmeter. In the straight part of the curvature number Sr=0.16, the fluid velocity V=f•d/Sr can be measured so as long as the frequency f is accurately measured, thus achieving the purpose of measuring the fluid flow in the pipeline;

即：Q=3600×f/k······ (1) (K-仪表系数，次/m3)

That is, Q=3600×f/k... (1) (K-instrument coefficient, times/m3)

• 用途广泛，可用于绝大多数蒸汽、气体和液体流量计量、测量、控制。

• It has a wide range of applications and can be used for most steam, gas and liquid flow metering, measurement and control.

• 结构简单，故障率低，便于维护。

• It features simple structure, low failure rate and easy maintenance.

• 输出频率与流量线性好，不存在零点漂移问题。

• The output frequency is linear with the flow velocity, and there is no problem of zero drift.

• 转换器采用自适应频谱分析数字处理和完善的隔离系统保证在恶劣的现场环境下检测出真实信号，从而实现低测量下限，宽量程比和高稳定性能。

• The converter adopts adaptive spectrum analysis digital processing and perfect isolation system to ensure that the real signal is detected in the harsh field environment, thus realizing low measurement lower limit, wide range ratio and high stability performance.

• 自适应频谱分析技术，提高涡街数字信号处理的精度同时保证低功耗性能、高性能的数字信号处理技术提高涡街的抗干扰能力。

• Adaptive spectrum analysis technology improves the accuracy of vortex digital signal processing while ensuring low power consumption performance and high performance digital signal processing technology, which improves the anti-interference ability of vortex.

• 具备工业物联网功能，应用WiFi技术，在线运行监控，在线软件升级。

• It has the function of industrial IoT, applies WiFi technology, monitors online operation, and upgrades online software.

CKAS-FLVJ-S涡街流量计的流量范围参考表 

CKAS-FLVJ-SVortex flowmeter flow range reference table