RU1821518C - Arrangement for dissipating rolling waves - Google Patents

Abstract

The invention relates to hydraulic engineering; in particular, to devices for the extinguishing of katyhsh1gvolny on the channel of the channel - quick-speed. The purpose of the invention is to increase the efficiency of repayment wave and reduce capital costs. In the rapid flow channel, longitudinal dividing walls are installed, approaching at an angle of 6 12 ° to each other. The walls divide the rapid flow channel into three parallel channels. The damping of the waves is achieved by dephasing them in the central and lateral channels. 4 ill.

Description

FIELD OF THE INVENTION The invention relates to hydraulic engineering and can be used for damping rolling waves in a canal of a fast-flowing canal.

The purpose of the invention is to increase the efficiency of wave extinguishing under conditions of variable flow rates of water in a fleeting channel and to reduce capital costs. :

The goal is achieved in that the longitudinal vertical partitions with an inclined front face are made with a kink, approaching in the front part, and in the rear part they are arranged parallel to the side walls of the fast current, forming channels of a prismatic shape of unequal width, spreading waves, and the angle of fracture of the partitions is @ 6 °, and the length of the section from the end of the partitions to the regulatory hydraulic structures does not exceed 6.5 °, where b is the width of the rapid flow.

In FIG. 1 shows a device for damping rolling waves, a view in the channel; on the

figure 2 is the same, a section aa in figure 1; figure 3 is the same, a section bB in figure 2; figure 4 is the same, a section bb in figure 2.

The transient channel 1 includes a lined wall 2 and a bottom 3 of a gully, on which longitudinal walls 4 having a kink are installed.

The dividing walls 4 have a front face which is inclined against the flow and approaching, form a central 5 and side-; 6 channels of unequal width, per; walls 4 arrange the spreading region 7 of the rolling waves.

The device operates as follows. ; ,. . .... , .... . .;

Longitudinal dividing walls 4, mounted in front of the regulating structures, divide the wave flow into parts, directing it into the narrowing central 5 and expanding side channels. In view of the fact that the specific flow rate in the crest of the rolling wave in the central channel 5 is higher (Л

WITH

00

Yu

ate with

there are specific costs in the side channels b, the crest advancement speed in the central channel 5 is higher than in the side channels 6. As a result, the shear wave crest leaves the central channel 5 earlier than the side channels 6, i.e. dephasing of the moving wave occurs.

In the spreading section 7, a wave rolling along, simultaneously emanating from the central 5 or side 6 channels, spreads over the entire width of the quick-flow, its crest is flattened, the wave height at the end of the spreading section decreases, i.e. extinguished. In this case, the flow rate concentrated in the crest of the rolling wave is distributed at the exit from the longitudinal partitions 4 in time and, therefore, in the wavelength, creating a mode of motion close to steady state at the end of the device.

According to experimental studies conducted on the wave installation of the Kyrgyz Agricultural Institute, the effect of dephasing and damping of rolling waves is already apparent when one longitudinal dividing wall with a kink separating the wave stream into two unequal parts is installed. The wave suppression effect increases with the installation of a larger number of walls, i.e. with an increase in the multiplicity of the division of the wave flow along the width, but at the same time the restriction of the flow by the walls increases, causing an undesirable increase in its depth. Thus, the number of longitudinal dividing walls can vary depending on the required degree of damping of the rolling waves on the one hand, and the reserve of the building height of the fast-flow channel, on the other.

The angle of fracture of the partitions 0 6 ° is accepted on the basis of experimental studies on the condition that the formation of oblique jumps in the narrowing channels 5 between the partitions and the continuous flow in the expanding channels are excluded

b. V ....- ... ;

The total length of the partitions according to the research results does not exceed 12 b, while the length of the approach section of the partitions is 0.8-2.5 b, depending on the proportion of the distribution of wave flow over the width. Accordingly, the length of the section where the partitions are parallel to the side walls of the rapid flow channel varies 11.2-5b.

The spreading length of the waves emerging from the lateral or central channels of the waves, corresponding to the distance from the end of the partitions to the regulating structures (outlets, water dividers, transitional sections of the rapid flow), does not exceed 6.5 b according to the research results.

At the length of this section, the formation of new rolling waves begins. At the same time, with a length of this section shorter than 1.5 b, the wave stream transforms into quasi-uniform one.

The efficiency of wave suppression was estimated in experiments by the coefficient

2a

wave transformations

F

value

which for the proposed arrangement of the device containing two longitudinal partitions with a kink did not exceed the value of Кb 0.15-0.40 at flow rates varying from 0.2 Qmax to 1.0 Qmax, where 2 a is the amplitude of the free surface

flow in the final section of the device, i.e. at the end of the wave spreading portion; I8 is the height of the rolling waves in the upper pool of the device; Qmax - maximum estimated flow rate of the channel - rapid flow.

Savings in capital costs for the construction of devices for damping rolling waves are achieved in comparison with the prototype, firstly, by reducing the number of devices, especially on channels

fast currents with a small number of regulatory structures, and secondly, by reducing the length of the walls.

Claims (1)

SUMMARY OF THE INVENTION waves, containing the quick-flow channel with lined walls and the bottom and located in the quick-flow channel, the wave suppressor, with the exception that, in order to increase the efficiency of the wave extinguishing under conditions of variable water flow rates and reduce capital costs, the wave suppressor made in the form of two vertical partitions mounted parallel to the walls of the channel-speed, and on the inlet section of the waveguide is confusingly at an angle to one another, while below the waveguide, the rapid channel is at least 6.5 b long, where b is the width of the rapid channel. . . . : ...... - - g r Figure 1 6. G Figs 5-6 SHZ at 7 K ////// L In tmiJ FIG. 4