CN111719516A - double-WoQicurve type bottom aeration facility for inhibiting cavity backwater - Google Patents
double-WoQicurve type bottom aeration facility for inhibiting cavity backwater Download PDFInfo
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- CN111719516A CN111719516A CN202010637839.1A CN202010637839A CN111719516A CN 111719516 A CN111719516 A CN 111719516A CN 202010637839 A CN202010637839 A CN 202010637839A CN 111719516 A CN111719516 A CN 111719516A
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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Abstract
The invention relates to a double-WoQicurve type bottom aeration facility for inhibiting cavity backwater, which comprises WoQicurve aeration flip-flops, WoQicurve type water retaining plates, an aeration vertical shaft, air ducts and air windows, wherein the WoQicurve aeration flip-flops are connected with an upstream gentle slope straight-line segment of an outlet structure, one end of each WoQicurve water retaining plate is connected with the bottom of the downstream end surface of the WoQicurve aeration flip-flop, the other end of each WoQicurve water retaining plate is connected with a downstream steep slope straight-line segment of the outlet structure, the two aeration vertical shafts are respectively arranged on the outer sides of two side walls of the outlet structure and close to the connection part of the WoQicurve aeration flip-flops and the WoQicurve water retaining plates, the air ducts are positioned below a bottom plate close to the downstream end of the WoQicurve aeration flip-flops and transversely penetrate through the outlet structure to be communicated with the two aeration vertical shafts, the air windows are arranged on the downstream end surfaces of the WoQicurve aeration flip-curve aeration flip-flops and are communicated with the, the end face of the downstream end of the Woqi curve aeration flip bucket below the ventilation window forms a water retaining ridge.
Description
Technical Field
The invention belongs to the field of aeration facilities for water outlet buildings in hydraulic and hydroelectric engineering, and particularly relates to an aeration facility for a large single-wide-flow low Fr number water outlet building.
Background
With the development of water conservancy and hydropower engineering technology, large single wide flow (q)>200m2(s), low Froude number (Fr)<3) The number of outlet structures is increasing, for the outlet structures, cavitation and cavitation damage are easy to occur on the overflowing side wall, and an aeration facility is needed to be arranged in the engineering to promote aeration of water flow and prevent cavitation damage on the wall surface.
The existing aeration facility is usually an aeration ridge, but under the conditions of large single-width flow and low Fr number, a cavity backwater phenomenon is very easy to occur in a bottom aeration cavity behind the traditional aeration ridge, the cavity backwater can influence the aeration effect, and in severe cases, an air inlet channel can be blocked by accumulated water, so that the aeration facility is failed, and a cavitation source is formed at the position to cause cavitation damage to an outlet structure. Therefore, the key of success or failure of the aeration facility is to reduce cavity backwater and reduce backwater length to ensure smooth ventilation.
In order to reduce cavity backwater, the prior art adopts the following technical measures: 1) the height and the angle of the aeration ridge are increased, the water flow projecting length is increased, and the backwater distance is prolonged to enlarge the cavity, but in order to avoid the impact of the water tongue of the water deflector on the top of the water outlet structure, a larger flood discharge section is necessary, so that the radial size of the water outlet structure is increased, the investment is increased, and the too high ridge height causes the too large impact force of the water tongue falling to the downstream bottom plate, thereby damaging the bottom plate; 2) the incident angle between the water-picking flow tongue at the water falling position and the downstream bottom plate is reduced by adjusting the gradient of the downstream bottom plate, but in the actual engineering, the gradient of the downstream bottom plate cannot be adjusted too much often due to the fact that the upstream and downstream elevations of the bottom plate are fixed and the limitation of geographical conditions; 3) the special-shaped aerator ridge forms such as the splay ridge, the U-shaped ridge, the V-shaped ridge, the convex ridge and the like are adopted, but the ridge forms have an unsatisfactory effect of reducing cavity backwater under the conditions of large single-width flow and low Fr number, and the ridge forms can damage the flow state and cannot adapt to the flow change. Therefore, how to design a flow meter suitable for large single wide flow (q)>200m2(s), low Froude number (Fr)<3) And the aeration measure which has simple structure and strong adaptability and can improve the service life of the water outlet structure is a technical problem.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a double-WoQicurve type bottom aeration facility for inhibiting cavity backwater, which can effectively reduce the cavity backwater and improve the aeration and corrosion reduction effects of a water outlet structure under the conditions of large single-wide flow and low Fr number, has a simple structure, is suitable for the flow conditions of different working conditions and can reduce the impact force of a water tongue on a downstream bottom plate.
The invention relates to a double-WoQicurved bottom aeration facility for inhibiting cavity backwater, which comprises WoQicurved aeration flip-flops, WoQicurved water-retaining plates, ventilation vertical shafts, ventilation channels and ventilation windows, wherein the WoQicurved aeration flip-flops are connected with upstream gentle slope straight-line segments of an outlet structure, one end of the WoQicurved water-retaining plates is connected with the bottom of the downstream end surface of the WoQicurved aeration flip-flops, the other end of the WoQicurved water-retaining plates is connected with downstream steep slope straight-line segments of the outlet structure, the ventilation vertical shafts are two, are respectively arranged on the outer sides of two side walls of the outlet structure and close to the connection position of the WoQicurved aeration flip-flops and the WoQicurved water-retaining plates, the ventilation channels are positioned below the bottom plate close to the downstream end of the WoQicurved aeration flip-flops and transversely penetrate through the outlet structure and are communicated with the two ventilation vertical shafts, the ventilation windows are arranged on the downstream end surface of the WoQicurved aeration flip-flops and are communicated with the ventilation channels, the end face of the downstream end of the Woqi curve aeration flip bucket below the ventilation window forms a water retaining ridge.
In the double-WoQicurve type bottom aeration facility for inhibiting cavity backwater, the shape of the bottom plate of the WoQicurve aeration flip bucket is in a functional formula
Is determined in the formula, wherein1The slope of the base plate of the upper gentle slope straight section of the water outlet structure, b1200 to 500; the shape of the Woqi curve type water baffle is a function of
Is determined in the formula, wherein2The slope of the straight-line segment bottom plate of the downstream steep slope of the water outlet structure, b2Value of and b1The same is true.
In the double-cascade curve type bottom aeration facility for inhibiting cavity backwater, the cascade curve type water blocking and returning plate is connected with a straight section of a downstream steep slope of a water outlet structure through an inverse arc section, and the arc radius R of the inverse arc section is (6-12) h2In the formula, h2The depth of water at the lowest point of the reverse arc section when the water outlet structure drains at the highest water level is shown.
In the double-cascade curve type bottom aeration facility for inhibiting cavity backwater, the height h of the downstream end face of the cascade curve aeration flip bucket11.0-2.0 m, height h of water retaining ridgek＝0.2～0.3m。
In the double-WoQicurve-type bottom aeration facility for inhibiting cavity backwater, at least two ventilation windows are rectangular and are separated by beam structure plates.
Compared with the prior art, the invention has the following beneficial effects:
1. because the aeration facility comprises the Woqi curve aeration flip bucket and the Woqi curve type water-retaining plate, one end of the Woqi curve water-retaining plate is connected with the bottom of the end surface of the downstream end of the Woqi curve aeration flip bucket, and the other end of the Woqi curve water-retaining plate is connected with the straight line section of the downstream steep slope of the outlet structure, the impact angle of the water flow discharged from the aeration flip bucket can be effectively reduced under the conditions of large single-width flow and low Fr number, so that the water flow can flow downstream more easily, the water return of a cavity is obviously reduced, and the aeration cavity is enlarged.
2. The aeration facility is provided with the aeration vertical shafts, the air ducts and the air windows, the air ducts are positioned below the top surface close to the downstream end of the Woqi curve aeration flip bucket and transversely penetrate through the outlet structure to be communicated with the two aeration vertical shafts, the air windows are arranged on the downstream end surface of the Woqi curve aeration flip bucket and are communicated with the air ducts, and the downstream end surface of the Woqi curve aeration flip bucket below the air windows forms a water retaining ridge, so that the air windows are ensured not to be submerged by backwater under the matching of the Woqi curve type water retaining plates, the air can smoothly enter the aeration cavity through the aeration vertical shafts, the air ducts and the air windows, the aeration and corrosion reduction effects of the outlet structure are improved, and the occurrence of cavitation damage is avoided.
3. In the functional formula of the top surface shape of the Woqi curve aeration flip bucket of the aeration facility, a is1The slope of the straight-line segment of the upper gentle slope of the water outlet structure ensures smooth connection of water flow and the upper gentle slope, and b is preferably selected1The value range of (2) ensures the enough large Woqi curve curvature, can generate negative pressure of about 2-3 m near the aeration flip bucket bottom plate, can increase the overflowing capacity to promote aeration of the ventilation window, and can avoid cavitation.
4. Because the shapes of the Woqi curve water retaining plate and the Woqi curve aeration flip bucket bottom plate are similar, and the Woqi curve water retaining plate is connected with the downstream steep slope straight-line section of the water outlet structure through the reverse arc section, the water flow falls on the water retaining plate smoothly under different working condition flow conditions, the impact force of the water tongue on the bottom plate is reduced, the stable flow state is ensured, and the water flow is discharged smoothly.
5. The ventilation windows of the aeration facility are separated by the beam structure plate body, so that the strength is improved, and the stability of the structure is ensured.
6. The aeration facility can improve the aeration and corrosion reduction effect of the water outlet structure under the conditions of large single-wide flow and low Fr number, avoid cavitation damage, reduce the impact force of the water tongue on the bottom plate and improve the structural strength of the ventilation window, thereby prolonging the service life of the water outlet structure.
7. The air entrainment facility can utilize the Woqi curve connecting section of the outlet structure, and compared with the existing air entrainment facility, the air entrainment facility only adds the Woqi curve type water baffle plate and the air duct and the air window on the steep slope straight section of the outlet structure (see the embodiment, the comparative example and figure 5), thereby having simple structure and high cost performance and being beneficial to popularization and use.
Drawings
FIG. 1 is a schematic diagram of a double-Oldham-curve bottom aeration facility for suppressing cavity water return according to the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
FIG. 4 is a schematic view of an aeration facility according to a comparative example;
FIG. 5 is a schematic diagram comparing examples with comparative examples.
In the figure, 1-an upstream gentle slope straight-line section, 2-WoQicurve flip bucket, 3-air duct, 4-air vent window, 5-water retaining bucket, 6-WoQicurve water retaining plate, 7-reverse arc section, 8-a downstream steep slope straight-line section, 9-air vent vertical shaft, 10-side wall, 11-air mixing cavity and 12-air vent.
Detailed Description
The double-woolly curve type bottom aeration facility for inhibiting cavity backwater is further explained by the embodiment and the attached drawings.
Example 1
The outlet structure in this embodiment is a spillway tunnel, the designed water level elevation of the reservoir at the upstream of the spillway tunnel is 2707.00m, and the flow rate of the water is 4400m3The flood spillway comprises an inlet control section, a non-pressure tunnel section and an outlet diversion section, wherein the inlet control section adopts an open inlet, the initial inlet pile number is 0+000.000m, the inlet bottom elevation is 2669.00m, the inlet overflow weir is a WES weir, the weir top elevation is 2678.00m, the tunnel body of the non-pressure tunnel section is an urban gate-shaped section, the section size (width × height) is 15.0m × 24.0.0 m, the height of a straight wall is 19.7m, the radius of a top arch is 8.7m, the non-pressure tunnel section sequentially comprises a gentle slope straight line section, a Woqi curve connecting section and a steep slope straight line section, the gentle slope straight line section starts from the pile number 0+046.000m, the slope i of a bottom plate is 0.015, the Woqi curve section starts from the pile number 1+082.016m, and the shape of the bottom plate is a functional type
It is determined that the steep slope straight line segment starts from the pile number 1+140.766m, and the slope i of the bottom plate is 0.25. The outlet flip-flow section is formed by connecting an upstream steep slope straight-line section with a downstream flip bucket through a reverse arc with the radius of 280m, the reverse arc starts from the pile number of 1+342.090m, the downstream flip bucket is horizontally connected at the lowest point of the reverse arc, the pile number of the lowest point of the reverse arc is 1+410.000m, the lowest point bottom plate elevation is 2584.00m, the downstream flip bucket is a reverse arc with the radius of 80m, the outlet pile number of the downstream flip bucket is 1+446.343m, and the outlet bottom plate elevation is 2591.93 m.
In this exampleThe non-pressure tunnel section of the water outlet structure is provided with the double-Woqi curve type bottom aeration facility, and the aeration facility comprises a Woqi curve aeration flip bucket 2, a Woqi curve type water baffle and return plate 6, an aeration vertical shaft 9, an air duct 3 and an air window 4 as shown in figures 1 to 3. As shown in fig. 2, the cascade curve connecting section in the above-mentioned outlet structure is used as the bottom plate of the cascade curve aeration flip bucket 2 in the aeration facility, and the downstream end of the cascade curve connecting section is reduced by 1.2m to form the downstream end face of the cascade curve aeration flip bucket 2, and the height h of the end face is1(also known as kahm) is 1.2 m; one end of the woqun-shaped water-blocking and returning plate 6 is connected with the bottom of the end face of the downstream end of the woqun-shaped air-doped flip bucket 2, the other end of the woqun-shaped water-blocking and returning plate 6 is connected with the straight section 8 of the downstream steep slope of the water release structure through the reverse arc section 7, and the shape of the woqun-shaped water-blocking and returning plate 6 is formed by a function
The radius R of the counter-arc segment 7 is determined to be 10h2100m, two ventilation shafts 9 are respectively arranged at the outer sides of two side walls 10 of the water outlet building and close to the joint of the Woqi curve aeration flip bucket 2 and the Woqi curve type water retaining plate 6, the air duct 3 is positioned below a bottom plate close to the downstream end of the Woqi curve aeration flip bucket and transversely penetrates through the water outlet building to be communicated with the two ventilation shafts 9, the cross section of the air duct is rectangular, the length × is 2.5m × 2m, the ventilation windows 4 are arranged on the downstream end face of the Woqi curve aeration flip bucket and are communicated with the air duct 3, the number of the ventilation windows 4 is three, the shape is rectangular, the width × is 4m × 0.5m, the ventilation windows are separated by beam structure plate bodies, the downstream end face of the Woqi curve aeration flip bucket below the ventilation windows 4 forms a water retaining ridge 5, and the h of the water retaining ridgek＝0.2m。
A hydraulic model test is performed on the double-woqun-shaped bottom aeration facility, and the test result is as follows: the water level elevation of an upstream reservoir of the spillway tunnel is 2707.00m, and the flow rate of the overflow water is 4400m3Under the condition of/s, the average flow velocity of the water passing section on the Woqi curve aeration flip bucket 2 is 25.29m/s, the water depth on the flip bucket is 11.60m, the Fr number is 2.37 at the moment, and the emergent water flow is blocked at the Woqi curve typeThe dropping distance of the water return plate 6 is about 16m, the impact angle theta' formed between the water tongues and the woqun curve water return blocking plate 6 is about 7 degrees, the water tongues drop on the woqun curve water return blocking plate 6 and then are divided into two strands, the larger part of the water tongues flows to the downstream along the woqun curve water return blocking plate, the water flow state is stable, only a small part of the water tongues flows upwards along the woqun curve water return blocking plate to form return water, the air mixing cavity 11 is stable due to less return water, the length of the air mixing cavity is 8-10 m, air enters the air mixing cavity 11 through the air vertical shaft 9, the air channel 3 and the air vent window 4, continuous air supply can be achieved, the air mixing concentration along the central line of the downstream bottom plate is large, the protection range can reach 100m, and.
Comparative example 1
The physical and structural parameters of the outlet structure in the comparative example are completely the same as those of the example 1, and the hydraulic parameters are completely the same as those of the example 1.
In this comparative example, the same as example 1, aeration facilities including the woqi curve aeration flip bucket 2, the aeration shaft 9 and the aeration port 12 are installed in the pressureless tunnel section of the outlet structure as shown in fig. 4. As shown in FIG. 4, the cascade curve connecting section in the outlet structure is used as the bottom plate of the cascade curve aeration flip bucket 2 in the aeration facility, the downstream end of the cascade curve connecting section is reduced by 2.5m to form the downstream end surface of the cascade curve aeration flip bucket 2, and the height h of the downstream end surface3The height (also called as the ridge height) is 2.5m, the bottom of the end surface is directly connected with a downstream steep slope straight line section 8 of the outlet structure, the number of the ventilation shafts 9 is two, the ventilation shafts are respectively arranged on the outer sides of two side walls 10 of the outlet structure and close to the connection part of the Woqi curve aeration flip bucket 2 and the downstream steep slope straight line section 8 of the outlet structure, the number of the ventilation ports 12 is two, the shape is rectangular, the length × is 2.5m × 2m, the ventilation ports are respectively arranged on the two side walls 10 of the outlet structure and are close to the downstream end surface of the Woqi curve aeration flip bucket 2 and communicated with the ventilation shafts 9, and air can enter the aeration cavity for aeration through the ventilation shafts 9 and the ventilation ports 12.
The hydraulic model test is carried out on the aeration facility of the comparative example, and the test result is as follows: the water level elevation of an upstream reservoir of the spillway tunnel is 2707.00m, and the flow rate of the overflow water is 4400m3In the condition of/s, the WoQicurve aeration flip bucket 2 is over-riddenThe average flow velocity of a water section is 25.29m/s, the water depth is 11.60m, the Fr number is 2.37, the water flow span is about 18m, the impact angle theta formed between a water tongue and a straight line section bottom plate of a downstream steep slope of the outlet structure is about 13 degrees, compared with the embodiment 1, the impact angle theta is increased by nearly one time, the water tongue falls on the straight line section bottom plate of the downstream steep slope of the outlet structure and then is divided into two parts, the larger part flows to the downstream along the straight line bottom plate, the flow state of the water flow slightly fluctuates, the other part flows upwards along the straight line bottom plate to form return water, the depth of the return water reaches 1.6m at most, the vent 12 is almost completely blocked, and the.
Example 2
The water discharge structure in this embodiment is a spillway tunnel, the designed water level elevation of the reservoir at the upstream of the spillway tunnel is 2574.00m, and the water flow rate of the spillway tunnel is 3300m3The flood spillway comprises an inlet control section, a non-pressure tunnel section and an outlet diversion section, wherein the inlet control section adopts an open inlet, the initial inlet pile number is 0+000.000m, the inlet bottom elevation is 2538.00m, the inlet overflow weir is a WES weir, the weir top elevation is 2550.00m, the tunnel body of the non-pressure tunnel section is an urban gate-shaped section, the section size (width × height) is 15.0m × 24.0.0 m, the height of a straight wall is 19.7m, the radius of a top arch is 8.7m, the non-pressure tunnel section sequentially comprises a gentle slope straight line section, a Woqi curve connecting section and a steep slope straight line section, the gentle slope straight line section starts from the pile number 0+046.000m, the slope i of a bottom plate is 0.015, the Woqi curve section starts from the pile number 1+141.934m, and the shape of the bottom plate is a functional type
It is determined that the steep slope straight line segment starts from the pile number 1+238.184m, and the slope i of the bottom plate is 0.4. The outlet flip-flow section is connected with an upstream steep slope straight-line section and a downstream flip bucket through a reverse arc with the radius of 300m, the reverse arc starts from the pile number of 1+298.554m, the outlet flip bucket is horizontally connected at the lowest point of the reverse arc, the pile number of the lowest point of the reverse arc is 1+410.000m, the lowest point of the bottom plate is 2456.00m, the outlet flip bucket is a reverse arc with the radius of 80m, the pile number of the outlet of the flip bucket is 1+446.000m, and the height of the bottom plate of the outlet is 2462.00 m.
In this embodiment, the non-pressure tunnel section of the outlet structure is provided with the double-woolly curve type bottom aeration facility of the invention, and the aeration facility is shown in fig. 1 to fig. 1And 3, the air-mixing flip bucket comprises a Woqi curve air-mixing flip bucket 2, a Woqi curve water-retaining plate 6, an air ventilation vertical shaft 9, an air duct 3 and an air window 4. As shown in fig. 2, the cascade curve connecting section in the above-mentioned outlet structure is used as the bottom plate of the cascade curve aeration flip bucket 2 in the aeration facility, and the downstream end of the cascade curve connecting section is reduced by 1.2m to form the downstream end face of the cascade curve aeration flip bucket 2, and the height h of the end face is1(also known as kahm) is 1.2 m; one end of the woqun-shaped water-blocking and returning plate 6 is connected with the bottom of the end face of the downstream end of the woqun-shaped air-doped flip bucket 2, the other end of the woqun-shaped water-blocking and returning plate 6 is connected with the straight section 8 of the downstream steep slope of the water release structure through the reverse arc section 7, and the shape of the woqun-shaped water-blocking and returning plate 6 is formed by a function
The radius R of the counter-arc segment 7 is determined to be 12h2The structure comprises two ventilation vertical shafts (90 m), two ventilation vertical shafts (9) which are respectively arranged at the outer sides of two side walls (10) of the water outlet structure and close to the joint of the woodly curve aeration flip bucket (2) and the woodly curve water retaining plate (6), an air duct (3) which is positioned below a bottom plate close to the downstream end of the woodly curve aeration flip bucket and transversely penetrates through the water outlet structure to be communicated with the two ventilation vertical shafts (9), the cross section of the air duct is rectangular, the length × is 2.5m × 2m, the ventilation windows (4) are arranged on the downstream end face of the woodly curve aeration flip bucket and are communicated with the air duct (3), the number of the ventilation windows (4) is three, the shapes are all rectangular, the widths × are all 4m × 0.5m, the ventilation windows are separated by beam structure plate bodies, the downstream end face of the woodly curve aeration flip bucket below the ventilation windows (4) forms a water retaining ridge (5), and the water retaining ridgek＝0.2m。
A hydraulic model test is performed on the double-woqun-shaped bottom aeration facility, and the test result is as follows: the water level elevation of the reservoir at the upstream of the spillway cave is 2574.00m, and the water flow rate of the spillway cave is 3300m3Under the condition of/s, the average flow velocity of the water passing section on the Woqi curve aeration flip bucket 2 is 24.44m/s, the water depth on the flip bucket is 9.00m, the Fr number is 2.60 at the moment, the offset distance of the falling point of the emergent water flow on the Woqi curve type water retaining and returning plate is about 24m, the impact angle theta' formed between the water tongue and the Woqi curve type water retaining and returning plate is about 5 degrees, and the water tongue falls on the Woqi curve type water retaining and returning plate by smashingThe water return baffle 6 of the woqun curve is divided into two parts, the larger part of the water flow flows to the downstream along the water return baffle of the woqun curve, the water flow state is stable, only a small part of the water flow upwards along the water return baffle of the woqun curve to form return water, the return water is less, the aeration cavity 11 is stable, the length of the aeration cavity is 10-12 m, air enters the aeration cavity 11 through the ventilation vertical shaft 9, the ventilation channel 3 and the ventilation window 4, continuous air supplement can be realized, the aeration concentration along the central line of the downstream bottom plate is larger, the protection range can reach 100m, and the aeration effect is good.
Comparative example 2
The overall structure parameters of the outlet structure in the comparative example are completely the same as those in example 2, and the hydraulic parameters are completely the same as those in example 2.
In this comparative example, the same as example 2, aeration facilities including the woqi curve aeration flip bucket 2, the aeration shaft 9 and the aeration port 12 are installed in the pressureless tunnel section of the outlet structure as shown in fig. 4. As shown in FIG. 4, the cascade curve connecting section in the outlet structure is used as the bottom plate of the cascade curve aeration flip bucket 2 in the aeration facility, the downstream end of the cascade curve connecting section is reduced by 2.5m to form the downstream end surface of the cascade curve aeration flip bucket 2, and the height h of the downstream end surface3The height (also called as the ridge height) is 2.5m, the bottom of the end surface is directly connected with a downstream steep slope straight line section 8 of the outlet structure, the number of the ventilation shafts 9 is two, the ventilation shafts are respectively arranged on the outer sides of two side walls 10 of the outlet structure and close to the connection part of the Woqi curve aeration flip bucket 2 and the downstream steep slope straight line section 8 of the outlet structure, the number of the ventilation ports 12 is two, the shape is rectangular, the length × is 2.5m × 2m, the ventilation ports are respectively arranged on the two side walls 10 of the outlet structure and are close to the downstream end surface of the Woqi curve aeration flip bucket 2 and communicated with the ventilation shafts 9, and air can enter the aeration cavity for aeration through the ventilation shafts 9 and the ventilation ports 12.
The hydraulic model test is carried out on the aeration facility of the comparative example, and the test result is as follows: the water level elevation of the reservoir at the upstream of the spillway cave is 2574.00m, and the water flow rate of the spillway cave is 3300m3Under the condition of/s, the average flow velocity of the water cross section on the Woqi flip bucket 2 is 24.44m/s, the water depth is 9.00m, the Fr number is 2.60, the water flow separation distance is about 27m, and the downstream of the water tongue and the water outlet structure is steepThe impact angle theta formed between the straight line section bottom plates of the slopes is about 11 degrees, compared with the embodiment 2, the impact angle theta is increased by nearly one time, a water tongue falls on the straight line section bottom plate of the downstream steep slope of the water outlet structure and then is divided into two parts, the larger part flows to the downstream along the straight line bottom plate, the flow state of water flow is slightly fluctuated, the other part flows upwards along the straight line bottom plate to form return water, the depth of the return water is up to 1.2m, the air vent 12 is seriously blocked, and the aeration effect is extremely poor.
Claims (9)
1. The double-Woqi curve type bottom air-mixing facility for inhibiting cavity backwater is characterized by comprising Woqi curve air-mixing flip flops (2), Woqi curve water-mixing baffle plates (6), a ventilation vertical shaft (9), air ducts (3) and ventilation windows (4), wherein the Woqi curve air-mixing flip flops (2) are connected with an upstream gentle slope straight-line section (1) of a water discharge building, one end of the Woqi curve water-mixing flip flop plates (6) is connected with the bottom of the downstream end face of the Woqi curve air-mixing flip flops, the other end of the Woqi curve water-mixing flip flops (6) is connected with a downstream steep slope straight-line section (8) of the water discharge building, the number of the ventilation channels (9) is two, the two ventilation channels are respectively arranged on the outer sides of two side walls (10) of the water discharge building and close to the water return positions of the Woqi curve air-mixing flip flops (2) and the Woqi curve water-mixing flip flops (6) below the vertical shaft air-mixing flip flops and the two horizontal through water discharge ends of the water discharge building, and the two ventilation windows (3) pass through the water-mixing The air shafts (9) are communicated, the ventilation windows (4) are arranged on the end face of the downstream end of the woolly curve aeration flip bucket and are communicated with the ventilation channel (3), and the end face of the downstream end of the woolly curve aeration flip bucket below the ventilation windows (4) forms a water retaining flip bucket (5).
2. The double-woolly-curved bottom aeration facility for suppressing cavity backwater of claim 1, wherein the bottom plate shape of the woolly-curved aeration flip bucket is functionally expressed
Is determined in the formula, wherein1The slope of the base plate of the upper gentle slope straight section of the water outlet structure, b1200 to 500; the shape of the Woqi curve type water baffle-back plate (6) is expressed by a function
Is determined in the formula, wherein2The slope of the straight-line segment bottom plate of the downstream steep slope of the water outlet structure, b2Value of and b1The same is true.
3. The double-woolly curve type bottom aeration facility for inhibiting cavity backwater according to claim 1 or 2, characterized in that the woolly curve type water-retaining plate (6) is connected with a downstream steep slope straight section (8) of an outlet structure through an inverse arc section (7), and the arc radius R of the inverse arc section is (6-12) h2In the formula, h2The depth of water at the lowest point of the reverse arc section when the water outlet structure drains at the highest water level is shown.
4. The double-woolly curve type bottom aeration facility for inhibiting cavity backwater according to claim 1 or 2, characterized in that the height h of the downstream end surface of the woolly curve aeration flip bucket (2)11.0-2.0 m, height h of water blocking ridge (5)k＝0.2～0.3m。
5. The double-WoQicurve bottom aeration facility for inhibiting cavity backwater according to claim 3, wherein the height h of the downstream end face of the WoQicurve aeration flip bucket11.0-2.0 m, height h of water blocking ridge (5)k＝0.2～0.3m。
6. The double bottom-aeration facility for cavity backwater suppression according to claim 1 or 2, characterized in that the number of said aeration windows (4) is at least two, rectangular in shape, separated from each other by a beam structure plate.
7. The double bottom-blowing facility for suppressing cavity backwater according to claim 3, characterized in that said at least two louvers (4) are rectangular in shape and are separated from each other by a beam structure plate.
8. The double bottom-blowing facility for suppressing cavity backwater according to claim 4, characterized in that said at least two louvers (4) are rectangular in shape and are separated from each other by a beam structure plate.
9. The double bottom-blowing facility for suppressing cavity backwater according to claim 5, characterized in that said at least two louvers (4) are rectangular in shape and are separated from each other by a beam structure plate.
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| CN202010637839.1A CN111719516A (en) | 2020-07-01 | 2020-07-01 | double-WoQicurve type bottom aeration facility for inhibiting cavity backwater |
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| CN202010637839.1A CN111719516A (en) | 2020-07-01 | 2020-07-01 | double-WoQicurve type bottom aeration facility for inhibiting cavity backwater |
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| CN118441650A (en) * | 2024-07-08 | 2024-08-06 | 四川大学 | Structure for improving inlet flow state of asymmetric flood overflow surface hole |
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