An optimization method for the flow pattern at the downstream outlet of a lock water conveyance system.

Abstract

This invention relates to the field of lock design, and particularly to an optimization method for the flow pattern of the downstream outlet of a lock water conveyance system. The optimization method involves constructing an outlet model to facilitate hydraulic characteristic testing and adjustment of the outlet flow pattern by engineers. By setting a stilling sill in the energy dissipation chamber and an outlet grid at the outlet, the flow velocity of the water discharged from the energy dissipation chamber can be reduced, thereby controlling the water level rise and fluctuations within a suitable range. By adjusting the arrangement of the stilling sill and outlet grid in the outlet model, the optimal arrangement scheme is obtained. This arrangement scheme is then proportionally converted and applied to the downstream outlet of the lock water conveyance system, enabling rapid acquisition of the downstream outlet arrangement scheme. This makes the downstream outlet design of the lock water conveyance system more rational, ensuring stable berthing of ships within the lock chamber and preventing violent shaking of ships when the lock chamber is filled with water.

Description

Technical Field

[0001] This invention relates to the field of lock design, and in particular to a method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system. Background Technology

[0002] A lock is a box-shaped hydraulic structure used to ensure that ships can pass smoothly through a channel with a concentrated water level difference. A lock consists of upstream and downstream approach channels and upstream and downstream lock chambers. The lock chamber is a box-shaped room for mooring ships. By filling or draining water into the chamber, the water level in the lock chamber is adjusted, allowing the ship to rise and fall vertically between the upstream and downstream water levels, thereby passing through the channel with a concentrated water level difference.

[0003] When a ship travels from downstream to upstream, the water level in the lock chamber drops to the same level as the downstream water level. Then, the gate of the downstream lock head is opened, the ship enters the lock chamber, the gate is closed, water is pumped in, and after the water level rises to the same level as the upstream water level, the gate of the upstream lock head is opened, and the ship can then exit the lock and pass through the upstream approach channel to sail upstream. When a ship travels from upstream to downstream, the lock passage procedure is the reverse.

[0004] However, the current water flow pattern near the outlet at the bottom of the lock chamber is greatly affected by the drainage outlet. When water is pumped into the lock chamber, the flow of water at the outlet will cause the water surface to rise and the water level to fluctuate, which can easily cause the ships inside the lock chamber to sway, and in severe cases, it will cause the ships to capsize. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of water level rise and insufficient water level fluctuation caused by the flow of water at the outlet in the prior art, and to provide an optimization method for the flow pattern of water at the downstream outlet of a lock water conveyance system.

[0006] This invention provides a method for optimizing the flow pattern at the downstream outlet of a ship lock water conveyance system, comprising the following steps:

[0007] S1: Model Construction: Construct a model of the outlet with a bar screen energy dissipation chamber downstream of the lock;

[0008] By constructing an outlet model, engineers can optimize and adjust the downstream outlet of the lock water conveyance system. The outlet model can also simulate the process of filling the lock chamber with water, enabling operators to accurately grasp the actual flow pattern of the downstream outlet of the lock water conveyance system.

[0009] S2: Install energy dissipation sills: Install at least two energy dissipation sills inside the grid energy dissipation chamber;

[0010] The flow velocity of water entering the bar energy dissipation chamber is slowed down by the energy dissipation sill, thereby avoiding water level rise and fluctuation at the outlet of the bar energy dissipation chamber;

[0011] S3: Adjust the stilling sill and outlet grille: Adjust the height of the stilling sill, the position of the stilling sill, the size of the outlet grille opening, and the spacing between adjacent outlet grille openings;

[0012] The outlet grille can further prevent water level rise and fluctuation. By adjusting the height and installation position of the energy dissipation sill, and by adjusting the size of the outlet grille opening and the spacing between adjacent openings, the flow velocity of the water discharged from the grille energy dissipation chamber can meet the requirements, so that the phenomenon of water level rise and fluctuation near the downstream outlet is within a controllable range.

[0013] S4: Verify the hydraulic characteristics of the model: Verify the hydraulic characteristics of the outlet model and obtain the hydraulic characteristic data of the model;

[0014] By verifying the hydraulic characteristics of the outlet model, the flow pattern of the outlet model can be displayed more intuitively through the hydraulic characteristic data.

[0015] S5: Obtain the optimal adjustment values: Repeat steps S3-S4 until the model hydraulic characteristic data meets the requirements, and obtain the optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal outlet grid adjacent opening spacing.

[0016] By comparing the acquired hydraulic characteristic data with the required hydraulic characteristic data, the optimal stilling basin height, the optimal stilling basin position, the optimal outlet grille opening size, and the optimal outlet grille adjacent opening spacing are determined.

[0017] S6: Verify the actual flow pattern at the outlet: Based on the optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal spacing between adjacent outlet grid openings, verify the actual hydraulic characteristics of the downstream outlet of the lock water conveyance system.

[0018] The optimal stilling sill height, optimal stilling sill position, optimal outlet grille opening size, and optimal spacing between adjacent outlet grille openings are converted into the actual optimal stilling sill height, actual optimal stilling sill position, actual optimal outlet grille opening size, and actual optimal spacing between adjacent outlet grille openings. The outlet grille and stilling sill are then set according to the actual values ​​to verify whether the adjustment of the outlet grille and stilling sill at the downstream outlet of the lock water conveyance system meets expectations.

[0019] This invention discloses a method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system. The outlet model is constructed to scale with the actual lock outlet, simulating its operation and ensuring the acquired hydraulic characteristics data accurately reflect the actual flow pattern. Energy dissipation sills are installed within the energy dissipation chamber, causing the water flow to decelerate upon impact. Multiple sills enhance the energy dissipation and deceleration effect. The outlet gratings divert water out of the chamber, preventing water level rise and fluctuations. Operators adjust the height and position of the energy dissipation sills, the size of the outlet grating openings, and the spacing between adjacent openings to ensure the optimal energy dissipation of the outlet model. The optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal spacing between adjacent outlet grid openings are calculated. These parameters are then converted into actual optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal spacing between adjacent outlet grid openings. The obtained actual values ​​are applied to the downstream outlet of the lock water conveyance system. By verifying the hydraulic characteristics of the downstream outlet, the optimization scheme for the outlet is confirmed to meet expectations. This invention provides a method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system, enabling rapid adjustment of the flow pattern to the desired level, keeping water level rise and fluctuations within a controllable range.

[0020] After the water flows into the bar screen energy dissipation chamber, it will hit the energy dissipation sill as it flows inside the chamber. The water flow hitting the energy dissipation sill will change direction and form a reversed flow. The reversed flow impacts the water flow entering the bar screen energy dissipation chamber, causing the water flow inside the bar screen energy dissipation chamber to dissipate energy and slow down, thereby reducing the water flow velocity discharged from the outlet.

[0021] Preferably, in S1, the outlet model is provided with four horizontal branch corridors, each of which is connected to the grid energy dissipation chamber.

[0022] All four transverse branch corridors are connected to the main corridor, and each of the four branch corridors is connected to a bar screen energy dissipation chamber to form an outlet. This arrangement of the bar screen energy dissipation chambers ensures that the outlets of adjacent bar screen energy dissipation chambers are spaced apart. The four transverse branch corridors divert the water flow from the main outlet corridor, reducing the flow velocity and flow rate, thereby alleviating the energy dissipation and deceleration pressure on the bar screen energy dissipation chambers. This also expands the adjustment range of the energy dissipation sill and the outlet bar screen, facilitating the adjustment of the height and position of the energy dissipation sill, the opening size of the outlet bar screen, and the spacing between adjacent openings. In some embodiments, two branch pipes are also provided at the ends of the transverse branch corridors. The bar screen energy dissipation chambers are connected to the transverse branch corridors through the branch pipes, further diverting the water flow through the branch pipes.

[0023] Preferably, in S1, the top of the grid energy dissipation chamber is provided with a drain outlet, and the drain outlet is covered with the outlet grid; the side wall of the grid energy dissipation chamber is provided with a water inlet, and the water inlet is connected to the transverse branch corridor.

[0024] The drain outlet of the bar energy dissipation chamber is located at the top of the bar energy dissipation chamber, making the bar energy dissipation chamber form a top drainage. The water inlet is opened on the side wall of the bar energy dissipation chamber. After the water flows into the bar energy dissipation chamber through the water inlet, it hits the energy dissipation sill or the side wall of the bar energy dissipation chamber, which slows down the energy dissipation of the water flow entering the bar energy dissipation chamber, thereby reducing the water flow velocity at the outlet of the bar energy dissipation chamber.

[0025] Preferably, in S2, the energy dissipation sill is a plate-shaped structural component, the bottom of the energy dissipation sill is connected to the bottom of the grid energy dissipation chamber, and the two ends of the energy dissipation sill abut against the side wall of the grid energy dissipation chamber respectively.

[0026] The energy dissipation sill is a plate-shaped structural component set perpendicular to the direction in which the water flows into the energy dissipation chamber of the bar screen. By blocking the water flow through the plate-shaped structural component, which has a larger blocking area, it can better slow down the water flow entering the energy dissipation chamber of the bar screen, thereby reducing the water flow velocity at the outlet of the energy dissipation chamber of the bar screen.

[0027] Preferably, in S2, several of the energy dissipation sills are spaced apart along the direction in which the water flows into the grid energy dissipation chamber.

[0028] By setting up multiple energy dissipation sills, the energy dissipation and deceleration effect on the water flow is enhanced. There are gaps between adjacent energy dissipation sills. Energy dissipation sills located at different horizontal positions in the energy dissipation chamber of the grid can block the water flow at different horizontal positions, thereby improving the energy dissipation and deceleration effect on the water flow. Sufficient space is reserved between adjacent energy dissipation sills to allow the water flow to continue, ensuring the energy dissipation and deceleration effect of the energy dissipation sills on the water flow.

[0029] Preferably, in S2, the height of the energy dissipation sill increases sequentially along the direction of water flow into the grid energy dissipation chamber.

[0030] Energy dissipation sills of different heights can dissipate energy and slow down water flow at different heights entering the bar energy dissipation chamber. After the water flow enters the bar energy dissipation chamber, the water flow at the bottom is first blocked by the lower energy dissipation sills. The reflected water flow flows with the water flow in the upper layer of the bar energy dissipation chamber. The water flow at higher levels in the bar energy dissipation chamber is blocked by the higher energy dissipation sills, which improves the energy dissipation and slowing down efficiency of the bar energy dissipation chamber and enables the water flow in the bar energy dissipation chamber to be quickly dissipated and slowed down.

[0031] Preferably, in S1, the outlet grille is a rectangular plate, and a plurality of strip openings are arranged in an array on the outlet grille, the strip openings penetrating the outlet grille.

[0032] The outlet grille is a rectangular plate adapted to the top drainage outlet of the grille energy dissipation chamber. Several strip openings are arranged in an array on the surface of the rectangular plate. By adjusting the size of the strip openings and the spacing between adjacent strip openings, the water flow discharged from the grille energy dissipation chamber meets the requirements. The water flow discharged from the grille energy dissipation chamber is diverted through several strip openings, so that the water level rise and water level fluctuation at the downstream outlet are within a controllable range.

[0033] Preferably, in S4, the model hydraulic characteristic data includes water flow velocity.

[0034] The water flow velocity can intuitively reflect the stability of the liquid surface at the outlet of the sluice model, providing strong data support and making it easier to adjust the energy dissipation sill and outlet grid. In some implementations, the hydraulic characteristic data also includes pressure data. When measuring the water flow velocity, by selecting multiple measurement points to measure the water flow velocity, the water flow state at the outlet of the sluice model can be more comprehensively reflected.

[0035] Preferably, the method for verifying the hydraulic characteristics of the bar screen energy dissipation chamber model is as follows: select five measurement points at the outlet of the outlet model, and set the five measurement points equally on the same cross-section of the outlet. Monitor the flow velocity changes at the five measurement points respectively, and draw a "flow velocity-time" graph for the five measurement points.

[0036] By selecting five points on the cross-section of the outlet for flow velocity monitoring, the changes in the flow pattern at the outlet can be displayed more intuitively. The five measurement points are equally distributed on the cross-section of the outlet, providing a more comprehensive view of the changes in the flow velocity at the outlet. By plotting a "flow velocity-time" graph, the flow pattern at the outlet can be displayed more intuitively, ensuring that the backwater level and water level fluctuations at the downstream outlet are within a controllable range, and confirming that the flow pattern at the outlet meets the requirements.

[0037] Preferably, in S6, the optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal outlet grid adjacent opening spacing are proportionally converted into actual values ​​to verify the actual hydraulic characteristics of the downstream outlet of the lock water conveyance system.

[0038] The outlet model is a scaled model of the downstream outlet of the lock water conveyance system. The optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal adjacent outlet grid openings are proportionally converted to the actual optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal adjacent outlet grid openings of the lock water conveyance system. After adjusting the downstream outlet of the lock water conveyance system with the actual values, the actual hydraulic characteristics of the downstream outlet of the lock water conveyance system are verified to ensure that the hydraulic characteristics of the downstream outlet of the lock water conveyance system meet the requirements.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] 1. This invention provides a method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system. The outlet model is constructed proportionally to the lock outlet, enabling it to simulate the actual lock outlet operation and ensuring that the acquired hydraulic characteristic data substantially reflects the actual flow pattern at the lock outlet. By installing energy dissipation sills within the energy dissipation chamber, the water flow entering the chamber is decelerated upon impact. Multiple energy dissipation sills enhance the energy dissipation and deceleration effect of the energy dissipation chamber. The outlet grid can divert the water flow exiting the energy dissipation chamber, preventing water level rise and fluctuations. Operators adjust the height and position of the energy dissipation sills, the size of the outlet grid openings, and the spacing between adjacent openings to ensure the final hydraulic characteristic data of the outlet model meets requirements, thereby obtaining the optimal energy dissipation of the outlet model. The optimal stilling basin height, optimal stilling basin position, optimal outlet grid opening size, and optimal spacing between adjacent outlet grid openings are calculated. These parameters are then converted into actual optimal stilling basin height, position, opening size, and spacing, and applied to the downstream outlet of the lock water conveyance system. By verifying the hydraulic characteristics of the downstream outlet, the optimization scheme for the outlet is confirmed to meet expectations. This invention provides a method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system, enabling rapid adjustment of the flow pattern to the desired level, keeping water level rise and fluctuations within a controllable range.

[0041] 2. This invention provides an optimization method for the flow pattern of the downstream outlet of a lock water conveyance system. By constructing an outlet model, engineers can easily conduct hydraulic characteristic tests and adjust the flow pattern of the outlet model. By setting an energy dissipation sill in the energy dissipation chamber and an outlet grid at the outlet, the flow velocity of the water discharged from the energy dissipation chamber can be slowed down, thereby controlling the water level rise and fluctuations within a suitable range. By adjusting the arrangement of the energy dissipation sill and outlet grid in the outlet model, the optimal arrangement scheme can be obtained. After proportionally converting the arrangement scheme, it can be placed at the downstream outlet of the lock water conveyance system, enabling rapid acquisition of the downstream outlet arrangement scheme. This makes the downstream outlet design of the lock water conveyance system more reasonable, ensuring stable berthing of ships in the lock chamber and avoiding violent shaking of ships when the lock chamber is filled with water, thus having good economic and practical value. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of a method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system according to the present invention.

[0043] Figure 2 This is a schematic diagram of the structure of the grid energy dissipation chamber of the present invention;

[0044] Figure 3 This is a schematic diagram showing the distribution of five measurement points on the outlet model of the present invention;

[0045] Figure 4 This is a flow velocity-time graph of the measurement point of the outlet model of the present invention.

[0046] Marked in the image:

[0047] 1-Grate energy dissipation chamber, 2-Energy dissipation sill, 21-First energy dissipation sill, 22-Second energy dissipation sill, 3-Inlet, 4-Outlet, 5-Outlet grating. Detailed Implementation

[0048] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0049] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0050] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0051] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing between identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0052] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0053] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0054] Example 1

[0055] like Figures 1-4 As shown, a method for optimizing the flow pattern at the downstream outlet of a ship lock water conveyance system includes the following steps:

[0056] S1: Model Construction: Construct a model of the outlet downstream of the lock with a bar screen energy dissipation chamber. The scale of the outlet model with the actual downstream outlet of the lock water conveyance system is 1:500. The layout of the outlet model is consistent with the layout of the actual downstream outlet of the lock water conveyance system.

[0057] S2: Set up energy dissipation sills: Two energy dissipation sills are set in the energy dissipation chamber of the bar screen. The energy dissipation sills are spaced apart from the inlet of the energy dissipation chamber of the bar screen, and there is a gap between adjacent energy dissipation sills.

[0058] S3: Adjust the stilling sill and outlet grille: Adjust the height of the stilling sill, the position of the stilling sill, the size of the outlet grille opening, and the spacing between adjacent outlet grille openings;

[0059] S4: Verify the hydraulic characteristics of the model: By conducting hydraulic experiments, the hydraulic characteristics of the outlet model are verified by simulating the process of filling the lock with water. The hydraulic characteristic data of the model are obtained through measurement.

[0060] S5: Obtain the optimal adjustment values: Based on the hydraulic characteristic data of the model, adjust the stilling basin and the outlet grid. Repeat steps S3-S4 until the hydraulic characteristic data of the model meets the requirements, ensuring that the water flow in the outlet model is stable. Obtain the optimal stilling basin height, optimal stilling basin position, optimal outlet grid opening size, and optimal spacing between adjacent outlet grid openings set in the outlet model.

[0061] S6: Verify the actual flow pattern at the outlet: Based on the optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal spacing between adjacent outlet grid openings, convert the optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal spacing between adjacent outlet grid openings into actual values, and verify the actual hydraulic characteristics of the downstream outlet of the lock water conveyance system.

[0062] The outlet model is constructed to scale with the actual lock outlet, simulating its operation and ensuring the acquired hydraulic characteristics data accurately reflect the flow pattern. Energy dissipation sills are installed within the energy dissipation chamber; water entering the chamber is decelerated by impacting these sills. Multiple sills enhance the energy dissipation and deceleration effect. The outlet gratings divert water out of the chamber, preventing backflow and fluctuations. Operators adjust the height and position of the energy dissipation sills, the size of the outlet grating openings, and the spacing between adjacent openings to ensure the model's hydraulic characteristics meet requirements, thus obtaining optimal energy dissipation sill height, optimal sill position, and optimal flow pattern. The optimal outlet grid opening size and the optimal spacing between adjacent outlet grid openings are determined. Through calculation, the optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal spacing between adjacent outlet grid openings in the outlet model are finally converted into the actual optimal stilling sill height, actual optimal stilling sill position, actual optimal outlet grid opening size, and actual optimal spacing between adjacent outlet grid openings. The obtained actual values ​​are applied to the downstream outlet of the lock water conveyance system. By verifying the hydraulic characteristics of the downstream outlet of the lock water conveyance system, it is determined that the optimization scheme for the outlet meets the expectations. Through the optimization method of the water flow state of the downstream outlet of the lock water conveyance system of this invention, the water flow state of the downstream outlet of the lock water conveyance system can be quickly adjusted to the expected state, so that the water level rise and water level fluctuation of the downstream outlet of the lock water conveyance system are within a controllable range.

[0063] In one or more embodiments, in S1, the outlet model is provided with four horizontal branch corridors, which are connected to the main outlet corridor. The water flow is diverted through the four horizontal branch corridors, so that the energy dissipation pressure of the energy dissipation chamber connected to each horizontal branch corridor is reduced, allowing engineers to make greater adjustments to the energy dissipation sill and the outlet grid, reducing the difficulty of adjustment.

[0064] In an optional embodiment, in S1, the top of the bar screen energy dissipation chamber is provided with an outlet, so that the bar screen energy dissipation chamber fills the gate chamber with water by top drainage. The outlet cover is provided with an outlet bar, which disperses the water flow and avoids water level rise and fluctuation. The side wall of the bar screen energy dissipation chamber is provided with an inlet, which is connected to the transverse branch corridor. The water flow discharged into the bar screen energy dissipation chamber from the transverse branch corridor is decelerated and slowed down in the bar screen energy dissipation chamber, thereby preventing the water flow discharged from the bar screen energy dissipation chamber from causing water level rise and fluctuation beyond the controllable range.

[0065] In one or more embodiments, in S2, the energy dissipation sill is a rectangular plate-shaped structural member. The bottom of the energy dissipation sill is connected to the bottom of the grid energy dissipation chamber. The two ends of the energy dissipation sill abut against the side walls of the grid energy dissipation chamber, so that the energy dissipation sill is fixed inside the grid energy dissipation chamber. After the water flows into the grid energy dissipation chamber, the water flow impacts the energy dissipation and forms a reverse reversing water flow. The reversing water flow impacts the water flow entering the grid energy dissipation chamber through the inlet, thereby causing the water flow in the grid energy dissipation chamber to decelerate and be discharged from the outlet.

[0066] In an optional implementation, in S2, two energy dissipation sills are spaced apart along the direction of water flow into the energy dissipation chamber of the bar screen. The spaced-apart energy dissipation sills allow sufficient space for the water flow to impact the energy dissipation sills, thereby enhancing the deceleration effect on the water flow inside the energy dissipation chamber of the bar screen. Depending on the usage requirements, multiple energy dissipation sills can be installed inside the energy dissipation chamber of the bar screen.

[0067] In an optional implementation, in S2, the height of the energy dissipation sill increases sequentially along the direction of water flow into the grid energy dissipation chamber. Energy dissipation sills of different heights can block and dissipate energy from water flow at different heights within the grid energy dissipation chamber, thereby improving the energy dissipation and deceleration effect of the grid energy dissipation chamber on the water flow.

[0068] In one or more embodiments, in S1, the outlet grille is a rectangular plate with several strip-shaped openings arranged in an array on it. The strip-shaped openings penetrate the outlet grille and further divert the water flow through them, so that the water flow pattern at the outlet meets the requirements.

[0069] In one or more embodiments, in S4, the model hydraulic characteristic data includes water flow velocity, and the water flow state at the outlet is determined by monitoring the water flow velocity at the outlet.

[0070] In an optional implementation, the method for verifying the hydraulic characteristics of the bar screen energy dissipation chamber model is as follows: Five measurement points are selected at the outlet of the outlet model, and these five points are equally distributed across the same cross-section of the outlet. The velocity changes at each of the five measurement points are monitored, and a velocity-time graph is plotted for each of the five measurement points. By selecting five points on the outlet cross-section for velocity monitoring, the flow regime changes at the outlet can be more intuitively displayed. The equal distribution of the five measurement points across the outlet cross-section provides a more comprehensive view of the velocity changes at the outlet. Plotting a velocity-time graph allows for a more intuitive display of the flow regime at the outlet, confirming that the flow regime meets the requirements. The velocity-time graph is shown below. Figure 4 As shown.

[0071] In one or more embodiments, in S6, the optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal spacing between adjacent outlet grid openings are proportionally converted into actual values ​​to verify the actual hydraulic characteristics of the downstream outlet of the lock water conveyance system. After adjusting the downstream outlet of the lock water conveyance system using these actual values, the actual hydraulic characteristics of the downstream outlet of the lock water conveyance system are verified to ensure that the hydraulic characteristics of the downstream outlet of the lock water conveyance system meet the requirements.

[0072] Example 2

[0073] like Figures 3-4 The diagram illustrates a bar screen energy dissipation chamber 1 structure at the downstream outlet of a lock water conveyance system. The arrangement of the energy dissipation chamber 1 structure, including the middle energy dissipation sill and the outlet bar screen 5, is obtained using an optimization method for the flow pattern at the downstream outlet of a lock water conveyance system according to Embodiment 1. The bar screen energy dissipation chamber 1 structure has an inlet 3, an outlet 4, and a rectangular chamber. The inlet 3 is located at the top of the bar screen energy dissipation chamber 1 structure and communicates with the rectangular chamber. The outlet 4 is located on the side of the bar screen energy dissipation chamber 1 structure and communicates with the rectangular chamber. The energy dissipation sill 2 within the rectangular chamber includes a first energy dissipation sill 21 and a second energy dissipation sill 22. The first energy dissipation sill 21 and the second energy dissipation sill 22 are respectively connected to the bottom of the rectangular chamber. Both the first energy dissipation sill 21 and the second energy dissipation sill 22 are rectangular plates. The first energy dissipation sill 21 and the second energy dissipation sill 22 are set at intervals. After the water flows into the rectangular chamber, it can be intercepted by the first energy dissipation sill 21 and the second energy dissipation sill 22, thereby dissipating energy and slowing down the water flow. An outlet grid 5 is provided on the drain outlet 4. The water flow is further dispersed through the strip openings provided on the outlet grid 5, so that the water surface rise and water level fluctuation phenomenon formed by the water flow discharged from the grid energy dissipation chamber 1 at the downstream outlet of the lock water conveyance system are within a controllable range.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for optimizing the flow pattern at the downstream outlet of a ship lock water conveyance system, characterized in that, Includes the following steps: S1: Model Construction: Construct a model of the outlet of the lock downstream with a grid energy dissipation chamber; the top of the grid energy dissipation chamber is provided with a drain outlet, and the drain outlet is covered with an outlet grid; the grid energy dissipation chamber also has an inlet and a rectangular chamber, the inlet is located on the side wall of the grid energy dissipation chamber, the inlet is connected to the rectangular chamber, and the drain outlet is connected to the rectangular chamber. S2: Setting up energy dissipation sills: At least two energy dissipation sills are set up in the energy dissipation chamber of the grid; the energy dissipation sills are plate-shaped structural components, the bottom of the energy dissipation sills are connected to the bottom of the energy dissipation chamber of the grid, and the two ends of the energy dissipation sills abut against the side walls of the energy dissipation chamber of the grid; the energy dissipation sills include a first energy dissipation sill and a second energy dissipation sill, the first energy dissipation sill and the second energy dissipation sill are respectively connected to the bottom of the rectangular chamber, the first energy dissipation sill and the second energy dissipation sill are both rectangular plates, the first energy dissipation sill and the second energy dissipation sill are set at intervals, and the water flow can be intercepted by the first energy dissipation sill and the second energy dissipation sill after entering the rectangular chamber, thereby dissipating energy and slowing down the water flow; S3: Adjust the stilling sill and outlet grille: Adjust the height of the stilling sill, the position of the stilling sill, the size of the outlet grille opening, and the spacing between adjacent outlet grille openings; S4: Verify the hydraulic characteristics of the model: Verify the hydraulic characteristics of the outlet model and obtain the hydraulic characteristic data of the model; The method for verifying the hydraulic characteristics of the bar energy dissipation chamber model is as follows: Select five measurement points at the outlet of the outlet model, and set the five measurement points equally on the same cross section of the outlet. Monitor the flow velocity changes at the five measurement points respectively, and draw the "flow velocity-time" chart of the five measurement points. S5: Obtain the optimal adjustment values: Repeat steps S3-S4 until the model hydraulic characteristic data meets the requirements, and obtain the optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal outlet grid adjacent opening spacing. S6: Verify the actual flow pattern at the outlet: Based on the optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal spacing between adjacent outlet grid openings, verify the actual hydraulic characteristics of the downstream outlet of the lock water conveyance system.

2. The method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system according to claim 1, characterized in that, In S1, the outlet model is provided with four horizontal branch corridors, each of which is connected to the grid energy dissipation chamber.

3. The method for optimizing the flow pattern of the downstream outlet of a lock water conveyance system according to claim 2, wherein the inlet is connected to the transverse branch corridor.

4. The method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system according to claim 1, characterized in that, In S2, several energy dissipation sills are spaced apart along the direction of water flow into the grid energy dissipation chamber.

5. The method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system according to claim 4, characterized in that, In S2, the height of the energy dissipation sill increases sequentially along the direction of water flow into the grid energy dissipation chamber.

6. The method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system according to claim 1, characterized in that, In S1, the outlet grille is a rectangular plate with several strip-shaped openings arranged in an array on it, and the strip-shaped openings penetrate the outlet grille.

7. The method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system according to claim 1, characterized in that, In S4, the hydraulic characteristic data of the model includes the water flow velocity.

8. A method for optimizing the flow pattern at the downstream outlet of a lock water conveyance system according to any one of claims 1-7, characterized in that, In S6, the optimal stilling sill height, optimal stilling sill position, optimal outlet grid opening size, and optimal outlet grid adjacent opening spacing are proportionally converted into actual values ​​to verify the actual hydraulic characteristics of the downstream outlet of the lock water conveyance system.

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