The Generator of Vortex Flow Meter and Its Classification Description

The generator, also known as the vortex generator, is one of the core components of the vortex flow meter. Its main function is to force vortices to synchronously separate along their axial direction in the pipe flow field, transforming the three-dimensional pipe flow into a two-dimensional vortex flow. Another function of it is to cooperate with the detection element, provide a reasonable installation position for the detection element, and complete the detection of vortex street signals.

The flow characteristics of vortex flow meters, such as instrument coefficient, linearity, repeatability, and range, are all closely related to the shape and geometric parameters of the generator. At present, there is no strict theory or systematic calculation method for the design of the generator of vortex flow meters. In various vortex flow meter products launched by domestic and foreign manufacturers, the shape and size of the generator used are still determined based on a large number of experiments. Therefore, the classification of the generator can only be based on shape and structure. What are the classifications of the generator? At present, there are generally two classification methods in the industry. One is by column type, which includes cylindrical columns, triangular columns, trapezoidal columns, rectangular columns, T-shaped column generators, etc. Secondly, according to their structure, they can be classified into two types: single generators and double (multiple) generators. The basic shapes of monophytes include cylinders, triangular columns and rectangular columns, etc.

With the development of vortex flow meters, some composite generators have emerged. By combining several basic types of generators, good results can also be achieved. Based on a large number of experimental results, Hangzhou Yikong Technology Co., Ltd. has developed a series of vortex flow meters that mostly adopt triangular prism-shaped generators. These products are equipped with unique sensor packaging technology and protective measures, ensuring the stability and reliability of the products. Theoretically speaking, as long as the fluid being measured is viscous and moves around the flow, a positive pressure gradient (dp/dx 0) exists in the flow direction, and flow separation will occur. Therefore, when the fluid flows through any non-streamlined obstructive fluid, vortex streets will be formed after the Reynolds number Re reaches a certain value. However, the differences in the intensity and stability of the vortex street signals produced by the separation of generators with different shapes and geometric dimensions are relatively large. To meet the requirements of flow measurement, different generators have different basic requirements. In a sense, this is conducive to the design and development of vortex flow meters.