CN108589669B

CN108589669B - Device for reducing flood discharge, fog and rainfall of tunnel by using air curtain

Info

Publication number: CN108589669B
Application number: CN201810412344.1A
Authority: CN
Inventors: 胡再国; 王东
Original assignee: Sichuan University
Current assignee: Sichuan University
Priority date: 2018-05-03
Filing date: 2018-05-03
Publication date: 2020-03-06
Anticipated expiration: 2038-05-03
Also published as: CN108589669A

Abstract

A method for reducing tunnel flood discharge fog rainfall by using an air curtain relates to the field of flood discharge, and for reducing the flood discharge fog rainfall, the technical scheme is as follows: the blade is arranged at the two ends of a root shaft, the lower end blade is located in the tunnel, the upper end blade is located the tunnel upper end outside, tunnel upper end pipe wall has a through-hole, the shaft passes flood discharge tunnel upper end pipe wall, the blade of lower extreme is located the flood discharge tunnel, it is rotatory to be driven by the strength of water, it is rotatory to drive the upper end blade through the shaft, the upper end blade forms the fan, fix the wind scooper in the upper end of shaft, the wind scooper makes the upper end blade be located inside the wind scooper, the directional bank slope of air intake level of wind scooper, the directional surface of water top of air outlet level of wind scooper, the air curtain that. The beneficial effects are that: the water inside the flood discharge tunnel flushes the moving blades to cause the blades to rotate, and partial kinetic energy of flood discharge water is consumed; the air curtain hinders the convection current between air curtain top and the below, reduces flood discharge fog rain and spills over to the air curtain top and gets into the air and carry out diffuse probability.

Description

Device for reducing flood discharge, fog and rainfall of tunnel by using air curtain

Technical Field

The invention relates to the field of flood discharge, in particular to water mist formed by water body impact of tunnel flood discharge water.

Background

According to the description of the professional in the patent "a method for measuring the intensity of atomized rainfall in flood discharge in hydroelectric engineering (application No. 201210327163.1)": flood discharge atomization refers to the phenomena of rainfall and fog flow generated in the local area at the downstream of a hub in the process of discharging the water flow of a water and electricity engineering water discharge structure. The rainfall caused by flood discharge is often far greater than natural rainfall, the maximum rainfall intensity measured by the current flood discharge atomization rainfall reaches 5000mm/h, and the rainfall intensity in a short time in conventional weather is extremely rare, and exceeds 1000-2000 mm/h.

It can be seen from the above documents that the fog and rain caused by flood discharge is large and has a long duration, which threatens the stability of the bank slopes of the two banks at the downstream and the safety of the electrical appliances and the factory buildings of the power station, and therefore, how to reduce the amount of the fog and rain caused by flood discharge is a pressing problem.

Disclosure of Invention

In order to reduce flood discharge, fog and rainfall, the invention designs a device for reducing the flood discharge, fog and rainfall of the tunnel by using an air curtain.

The invention adopts the technical scheme that the purpose of the invention is realized by: use device of air curtain reduction tunnel flood discharge fog rainfall, including a radical axis, the blade is arranged at the both ends of axle, and the lower extreme blade is located the tunnel in, the upper end blade is located the tunnel upper end outside, characterized by: the horizontal distance from the center of the shaft to the water outlet of the tunnel is 5-10 meters; the tunnel upper end pipe wall has a through-hole, the axle passes flood discharge tunnel upper end pipe wall, the blade of lower extreme is located the flood discharge tunnel, it is rotatory to be driven by the strength of water, it is rotatory to drive the upper end blade through the axle, the upper end blade forms the fan, the fan is through the packing, make the air outlet just to the top of flood discharge water smoke, the air outlet after the encapsulation forms horizontal air curtain, the encapsulation is exactly the fixed wind scooper in the upper end of axle, the wind scooper makes the upper end blade be located inside the wind scooper, the directional bank slope of air intake level of wind scooper, the directional surface of water top of air outlet level of wind scooper, the air curtain that the air.

The outside of the through hole at the upper end of the tunnel is provided with a conical surface, the top of the conical surface is cut off by a cone, a hole is exposed for the shaft to pass through, the conical surface is fixed on the shaft in a watertight manner, and the distance between the lower edge of the conical surface and the upper surface of the outside of the tunnel is 1-5 cm. A guide plate is arranged above the tunnel water outlet, the width of the guide plate is 1.5-2 times of the width of the water outlet, and the guide plate is a plane or an arc-shaped surface bent downwards and used for preventing water flowers at the water outlet from sputtering upwards to form fog rain.

The beneficial effects are that: the water in the flood discharge tunnel drives the lower end blades to cause the lower end blades to rotate, partial kinetic energy of flood discharge is consumed, and the flood discharge tunnel is favorable for reducing the flood discharge fog and rain amount of the flood discharge tunnel water outlet; the air curtain hinders the convection current between air curtain top air and the below air, reduces flood discharge fog rain and overflows to air curtain top entering air and carry out diffuse probability to the flood discharge fog rainfall that significantly reduces. The air inlet of the air guide cover is horizontally directed to the bank slope, so that the backflow of the overflowing fog rain is facilitated, namely, the overflowing fog rain is reduced. The conical surface is designed to reduce the overflow of water, enhance the sealing performance between the shaft and the wall of the tunnel through hole, allow part of water to emerge from the ball gap and be guided to the outer surface of the tunnel by the rotating conical surface, and because of the influence of the upper air curtain, the water flowing out from the gap can not generate larger fog and rain. The water splash is prevented by the guide plate from splashing upwards to form fog rain because the edge of the water outlet is not smooth and the kinetic energy of the water is larger.

Drawings

FIG. 1 is a schematic view of an apparatus for reducing the amount of fog and rain in a tunnel; FIG. 2 is a schematic view of an upper end blade package;

the device comprises a shaft 1, a shaft 2, a tunnel 3, a water outlet 4, blades 5, an air guide cover 6, a conical surface 7, an air outlet 8, an air inlet 9 and a guide plate.

Detailed Description

A device for reducing tunnel flood discharge fog rainfall by using an air curtain comprises a shaft 1, blades 4 are arranged at two ends of the shaft 1, the lower-end blades 4 are positioned in a tunnel 2, the lower-end blades 4 comply with the working principle and the installation mode of water turbine blades 4, the flood discharge tunnel 2 is bent downwards, water flow impacts the lower-end blades 4 downwards, and the lower-end blades 4 rotate to drive a shaft perpendicular to the plane of the blades to rotate (the working mode is similar to that of a common fan, namely the shaft of the fan rotates to drive the blades perpendicular to the shaft to rotate, but the blades are forced to drive the shaft to rotate); the upper end vanes 4 are located outside the upper end of the tunnel 2 (following the operating principle of a fan, in which rotation of a shaft causes rotation of the vanes, which promotes unidirectional movement of air). The tunnel 2 depicted in fig. 1 is a cuboid, and most of the tunnels 2 are cylindrical pipes, that is, the longitudinal section of the tunnel 2 is a square ring or a circular ring, the longitudinal section of most of the tunnels is a circular ring, the inner side of the circular ring is an inner diameter, the outer side of the circular ring is an outer diameter, and the circular ring is a pipe wall, and the tunnel is characterized in that: the horizontal distance between the center of the shaft 1 and the water outlet 3 of the tunnel 2 is 5-10 m, and the horizontal distance is the distance between the projection of the center of the shaft 1 on the horizontal plane and the projection of the center of the water outlet 3 on the horizontal plane; the wall of the upper end of the tunnel 2 is provided with a through hole, the shaft 1 penetrates through the through hole of the wall of the upper end of the flood discharge tunnel 2, the shaft 1 and the side wall of the through hole are close to water seal, namely the wall of the tunnel 2 at the upper end of the flood discharge tunnel 2 is provided with a through hole, a gap between the shaft 1 and the side wall of the through hole of the tunnel 2 is smaller, a rolling bearing is arranged for smooth operation, the inner side of the inner layer of the rolling bearing is tightly attached to the shaft 1, the outer side of the outer layer of the rolling bearing is tightly attached to the side wall of the through hole, balls are arranged between the outer side of the inner layer of the rolling bearing and the inner side of the outer layer, the blades 4 at the lower end are positioned in the flood discharge tunnel 2 and driven to rotate by water force, the blades 4 at the upper end are driven to rotate by the shaft 1, the blades 4 at the upper end form a fan, the fan is packaged, the air, an air inlet 8 of the air guide cover 5 points to a bank slope horizontally, an air outlet 7 of the air guide cover 5 points to the upper part of the water surface horizontally, namely, an air curtain formed by the air outlet 7 presents a horizontal plane.

The outside of the through hole at the upper end of the tunnel 2 is provided with a conical surface 6, the top of the conical surface 6 is cut off by a cone, a hole for the shaft 1 to pass through is exposed, the conical surface 6 is fixed on the shaft 1 in a watertight manner, and the distance between the lower edge of the conical surface 6 and the upper surface of the outside of the tunnel 2 is 1-5 cm.

A guide plate 9 is arranged above a water outlet 3 of the tunnel 2, the width of the guide plate 9 is 1.5-2 times of that of the water outlet 3, and the guide plate 9 is a plane or an arc-shaped surface bent downwards to prevent water flowers at the water outlet 3 from sputtering upwards to form fog rain.

Claims

1. Use device of air curtain reduction tunnel flood discharge fog rainfall, including a root axis (1), blade (4) are all arranged at the both ends of axle (1), and lower extreme blade (4) are located tunnel (2), upper end blade (4) are located tunnel (2) upper end outside, characterized by: the horizontal distance from the center of the shaft (1) to the water outlet (3) of the tunnel (2) is 5-10 m; the tunnel (2) upper end pipe wall has a through-hole, axle (1) passes the through-hole on the tunnel (2) upper end pipe wall, blade (4) of lower extreme is located tunnel (2), it is rotatory to be driven by the power of water, then drive upper end blade (4) through axle (1) and rotate, upper end blade (4) form the fan, the fan is through the encapsulation, make air outlet (7) just to the top of flood discharge water smoke, air outlet (7) after the encapsulation form horizontal wind curtain, the encapsulation is at the upper end fixed wind scooper (5) of axle (1), wind scooper (5) make upper end blade (4) be located inside wind scooper (5), air intake (8) the level of wind scooper (5) points to the bank slope, air outlet (7) the level of wind scooper (5) points to above the surface of water, the wind curtain that air outlet (7) formed flows along the horizontal direction promptly.

2. The apparatus of claim 1, wherein the air curtain is adapted to reduce the amount of water and fog discharged from the tunnel: the outside of the through hole at the upper end of the tunnel (2) is provided with a conical surface (6), the top of the conical surface (6) is cut off by a cone, a hole penetrating through the axis of the conical surface is exposed for the shaft (1) to pass through, the conical surface (6) is fixed on the shaft (1) in a watertight manner, and the distance between the lower edge of the conical surface (6) and the upper surface of the outside of the tunnel (2) is 1-5 cm.

3. The apparatus of claim 1, wherein the air curtain is adapted to reduce the amount of water and fog discharged from the tunnel: a guide plate (9) is arranged above a water outlet (3) of the tunnel (2), the width of the guide plate (9) is 1.5-2 times of that of the water outlet (3), and the guide plate (9) is a plane or an arc-shaped surface bent downwards and used for preventing water flowers at the water outlet (3) from splashing upwards to form fog rain.