derived in the frequency and velocity relationship, the use of the vortex of stable conditions: interval than h /, this vortex that the frequency of certain structural impact of the vortex of space, and space structures and the vortex of the whirlpool in the shape of Relevant.

addition, in front of the discussion, we should also note that:

in the above derivation process, both in the one-dimensional flow under the conditions. However, in the pipe in the flow of axial symmetry is a three-dimensional distribution of flows.

in the upper reaches of a pipeline under the conditions of existence, there will be additional velocity distribution distortion, swirl, unstable factors such as fluctuations.

these two points will be the vortex of instability and the laws have an important impact. Therefore, the phenomenon found in the vortex after a very long time, has not used for measuring flow, in addition to signal detection technology, the Two points are also important causes. In order to overcome the impact of these factors must be in the vortex of the shape of a set of requirements so that the tube in the vortex of the flow as close as possible to two-dimensional flow, to control the flow of 3-D occurred in the vortex of a Vortex phase, the vortex of bending has become very small.

This shows that the vortex in the shape of the vortex of the issue have a decisive impact.

1. vortex in the shape of the basic requirements of

the shape of a vortex there are many kinds of patterns, but they must have some of the same basic requirements:

a blunt (non-Streamlined) cross-section shape - this is a vortex of the conditions;

shape of the same cross-section from top to bottom, and symmetrical - flow close to two-dimensional flow conditions;

boundary layer separation is fixed - Siteluoha few St constant conditions.

At the same time, in the vortex of a pipeline installed in the position must be strictly symmetrical. vortex in the upper reaches of D must have 10 times more than the straight, must have the lower reaches of the D five times straight.

2. vortex in the basic structure of

vortex in the shape of a cylinder, to 1.30, T-column, four Jiaozhu, the following are introduced with the 1.30-cylinder two types.

(1) a cylinder-type vortex of

vortex theory on the front part of the content is to discuss the cylinder as an example. While this type used earlier, but strictly speaking, the high velocity of its Siteluoha few St is not stable, so its people will improve as a slit or derivative form of pressure hole.

Figure 3-9 cylindrical vortex generator Figure 3-10 capacitive 1.30, in a vortex of

1 - Introduction pressure hole; 2 - cavity; 3 - partition; 4 - platinum margin

guidance of the cylindrical hole pressure vortex generators as shown in Figure 3-9. As a lead-pressure existence, when the vortex of a lift at the turn of the fluid flow through the guide hole pressure, a side inhalation, while the Chuichu Effect. When the fluid boundary layer in the cylindrical surface from the beginning, inhaling the side of separation was inhibited in the Chuichu example, was to promote separation occurred. This would enable the fluid from the point fixed location, it can Estero St Kazakhstan few relatively stable.

(2) 1.30 columnar vortex occurred in

more current in the vortex of a triangular column, and its general shape by the experiments. It can not only be more intense than the cylindrical vortex, and its boundary layer separation is fixed, that is, its Estero Kazakhstan few St relatively constant, at around St = 0.16. This vortex flow and the relationship between the frequency of f = 0.16 u / d, of which triangulation d column for the bottom width. Shapes that shown in Figure 3-10.