RU1821516C - Arrangement for preventing wave formation in chutes - Google Patents

Abstract

Usage: hydraulic engineering. The purpose of the invention is to increase the reliability of the device. Summary of the invention: trenches with inclined inlet and outlet ramps are made in rapid flow. In the trench x there are longitudinal partitions. Improving the stability of the flow to wave formation is achieved by fulfilling the criteria of T.G. Voynich-S of Nezhensky.

Description

The invention relates to hydraulic engineering and can be used to prevent the formation of rolling waves on high-speed channels and spillways.

The purpose of the invention is to increase the reliability of the device.

Figure 1 is a plan view of a device for preventing wave formation at high speeds; figure 2 is the same, a section aa in figure 1; on fiG.Z - the same, section BB in figure 2.

In rapid current 1, trenches 2 are arranged with inclined ramps 3 at the inlet and at the outlet 4, in which longitudinal partitions 5 with a trapezoidal base 6 are located.

The device operates as follows.

Longitudinal vertical partitions 5 located in trench 2 are installed in the zones of initial disturbances of the free surface of the turbulent flow, corresponding to the zones of generation of rolling waves. Being a barrier between the near-wall and bottom layers of the turbulent flow, the baffles 5 prevent the wall and bottom spruce spurts from joining and, thereby, prevent resonant vibrations of the free surface and prevent the formation of | rolling waves. The stability of the turbulent flow is also maintained by the polygonal outlines of the cross section of the longitudinal bottom slots 2, in which the living section of the flow has a vertically elongated shape. The high-speed flow, constrained by the longitudinal partitions 3, by increasing the depth of the channel, teaches the trench 2 to advance without increasing; level of the free surface in the channel, i Since the longitudinal walls do not protrude above the bottom of the channel, transport of floating objects through this device is also provided.

According to experimental studies performed on the wave installation of the Kyrgyz Agricultural Institute, the length of the device is not

00

go

shshD

ate

and

exceeds S

45 b

i

where b

the width of the rapid current, I is the slope of the bottom of the rapid current.

The height of the partition corresponding to the depth of trench 2 is not more than (0.7 ... 0.9) h0, where Н0 is the normal depth at the fast flow at the maximum calculated flow rate Qmaxi so that the total water depth in the device does not exceed the critical depth and at the exit of trench 2, a hydraulic jump was not formed. At the same time, to create a smoother coupling of the flow at the inlet ramp 3 of trench 2, the slope is at lax 0.35. in its central part, the bottom slope is equal to the bottom slope of the rapid current I, at output 4, the reverse slope is 1 Out and 0.25. As a result of the implementation of this device, the operational

0

5

0

reliability, since the possibility of clogging of the device by the fin is excluded and, therefore, the labor costs of cleaning it are reduced.

Claims (1)

The claims A device for preventing wave formation at fast currents, comprising a quick channel with cladding walls and a bottom and a wave suppressor located in the quick channel, with the aim of increasing the reliability of operation, the wave suppressor made in the form of a trench located at the bottom of the rapid flow channel containing the input and output ramps, with longitudinal vertical partitions installed in the trench, the upper faces of which are located at the bottom of the rapid flow channel.  :; : -j fi & g (pts & f