CN111321698A - Omnidirectional flow generating device in wave flow pool and method thereof - Google Patents
Omnidirectional flow generating device in wave flow pool and method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of coastal, offshore and ocean engineering, and relates to an omnidirectional flow making device and method in a wave current pool. The flow making device comprises a wave flow water pool, a flow equalizing area, an outflow (backflow) valve, a pressure gallery and a controllable bidirectional axial flow pump. Pumping a water body into an outflow pressure gallery by a bidirectional axial flow pump, entering a flow equalizing region through an opened outflow valve, and then flowing out of a wave flow pool from an outflow port to form a flow field required by an experiment; the backflow water enters the flow equalizing zone from the backflow port, flows back to the backflow pressure gallery through the opened backflow valve, and is pumped out through the axial flow pump pipeline to form circulating water flow. The device can superpose the wave in the wave current pond to can carry out the combined action research of wave and rivers to the experimental model.
Description
Technical Field
The invention relates to an omnidirectional flow making device in a wave current pool and a method thereof, belonging to the technical field of coastal, offshore and ocean engineering.
Background
The combined action of waves and water flow on coastal, offshore and ocean engineering structures is an important aspect of ocean engineering design research, the action of the waves, the flow and the engineering structures is a complex nonlinear change process, and theoretical analysis and numerical simulation research are difficult to meet actual requirements for the problem of the complex action of the waves, the flow and the engineering structures, so that the establishment of an experimental device and an experimental research method for accurately simulating the real physical environment in which the waves and the water flow coexist is the basis and an important means for developing relevant experimental research.
Related researches (such as nonlinear load design research of wave current on an ocean engineering structure system, hydrodynamics problem research on a deep-water culture net cage, offshore sea pollutant migration rule research, sea ice formation mechanism, dynamic interaction of ice load and a building, action mechanism research on seabed soil by marine environmental factors and the like) carried out by hydrodynamics at the present stage are to realize the interaction of waves and currents in different directions by using a movable submersible pump set to assist a simulation flow field in a wave current pool provided with a wave generator system. The submersible pump used in the method is just in the wave current pool, and will certainly generate disturbance influence on wave transmission; in addition, the flow field uniformity is difficult to meet the use requirement without adding the flow equalizing device, and the addition of the flow equalizing device can also influence wave transmission and bring large errors to the accuracy of the research result. Some flow-making ponds are also provided, and the outflow ports are built on the side walls of four sides of the pond; or in the wave flow pool, the outflow port of the flow making device is arranged on the wave pushing plate. Such a method and apparatus, when carrying out the relevant hydrodynamic experimental studies described in this patent, presents a hindering effect of the push wave plate on the formation of the induced flow.
Therefore, it is necessary to provide a method and a device capable of generating a flow field in all directions (i.e., omni-directional) in a wave pool, with controllable flow velocity (or flow rate), and meeting the requirement of wave flow co-action in hydrodynamic research.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an omnidirectional current generating device in a wave current pool and a method thereof, which meet the use requirement of developing physical model experimental research of hydrodynamic wave current combined action in the technical research fields of coastal, offshore and ocean engineering.
In order to achieve the above purpose and solve the problems existing in the prior art, the invention adopts the technical scheme that: an omnidirectional flow generation method in a wave current pool comprises a flow generation method for controlling the flow direction of water flow and a flow generation method for controlling the flow speed or flow of the water flow, wherein the flow generation method for controlling the flow direction of the water flow comprises the following steps: the flow field required by the experiment is generated in the wave flow water pool, N outflow valves and corresponding N backflow valves in the flow field required by the experiment in the wave flow water pool are opened, M outflow valves and corresponding M backflow valves outside the flow field required by the experiment are closed, and the selection of the direction of a certain flow field is realized; the method comprises the following steps: backflow water in a flow field required by an experiment enters respective backflow flow equalizing regions through N backflow ports in the wave flow pool, enters an L-shaped backflow pressing gallery through an opened backflow valve connected with the N backflow flow equalizing regions, passes through a bidirectional axial flow pump controlled by a computer, is pumped into the L-shaped outflow pressing gallery, enters respective outflow flow equalizing regions through N opened outflow valves, flows out of the outflow ports of the N outflow flow equalizing regions after being subjected to flow stabilization and flow equalization, enters the wave flow pool, forms closed-loop water flow, and realizes selection of forward flow field directions; if the selection of the reverse flow field direction is realized, the reversing of the bidirectional axial flow pump is changed, the backflow is changed into outflow, and the outflow is changed into backflow; the method comprises the following steps: the outflow opening is changed into a backflow opening, the outflow equalizing area is changed into a backflow equalizing area, the outflow valve is changed into a backflow valve, the outflow pressing gallery is changed into a backflow pressing gallery, the backflow valve is changed into an outflow valve, the backflow equalizing area is changed into an outflow equalizing area, the backflow opening is changed into an outflow opening, the working process is repeated, closed-loop water flow is formed, and the selection of the reverse flow field direction is realized; the flow making system is provided with 2(M + N) outflow and backflow valves, 2(M + N) outflow and backflow flow equalizing areas, 2(M + N) outflow and backflow ports, 2L-shaped pressure galleries and M, N which are natural numbers;
the flow making method for controlling the flow rate or flow of water flow comprises the following steps: the control computer is controlled to run a control program to generate a control signal, the output of the frequency converter is controlled through the control network, the rotating speed of the motor of the bidirectional axial-flow pump is adjusted, the flow velocity or flow of water flow is controlled, and therefore the flow velocity or flow of a flow field required by an experiment is controlled; in the control process, a feedback mechanism is used, namely data measured by a flow meter is selected as feedback control quantity to participate in flow rate control, or data measured by a flow meter is selected as feedback control quantity to participate in flow control; the core of the computer running control program is a control algorithm, an output control value is described by a formula (1),
u(n)＝U(n)+Δu(n) (1)
wherein U (n) represents an output control value, U (n) represents an output control base value, a given system final value U and a control time interval are set by a user and calculated according to linear interpolation, delta U (n) represents an output correction increment, an incremental digital PID control expression is adopted to describe through a formula (2),
Δu(n)＝Kp[e(n)-e(n-1)]+Kie(n)+Kd[e(n)-2e(n-1)+e(n-2)](2)
wherein e (n) represents a feedback value, i.e. an actual measured value of the flow rate or flow of the system, KpExpressing the proportional feedback coefficient, KiRepresenting the integral feedback coefficient, KdRepresents a differential feedback coefficient, wherein the system initial value u (0), e (0) is given by the measured value in the initial state of the system, Kp、Ki、KdWhen the system is debugged, the flow velocity or flow is set from small to large according to different water depths and different flow field widths in a segmented mode, a parameter value-taking expert library under all levels of water depths and flow field widths is established, and when the system is actually controlled and output, corresponding K is selected from the expert library in a grading mode according to the set water depths and the flow field widthsp、Ki、KdParameter(s)。
The device in the method comprises a wave flow water pool, an L-shaped outflow pressing gallery, an L-shaped backflow pressing gallery, M + N outflow uniform flow areas, M + N backflow uniform flow areas, M + N outflow openings in the water pool, M + N backflow openings in the water pool, N outflow valves which are opened and closed, N backflow valves which are opened and closed, a valve gallery, a plurality of bidirectional axial flow pumps, a plurality of flow making pump pipeline valves, a plurality of flow meters and flow meters, and is characterized in that: the wave flow water pool is positioned on the uppermost layer of the whole device, the L-shaped outflow pressing gallery and the L-shaped backflow pressing gallery are arranged on the lower part of the outer edge of the wave flow water pool in an opposite buckling and encircling manner, the total 2(M + N) outflow and backflow uniform flow areas are independent from each other and uniformly distributed on the four sides of the lower layer of the wave flow water pool, one end of each uniform flow area is opened, namely an outflow opening and a backflow opening are positioned on the bottom surface of the wave flow water pool, and the other end of each uniform flow area is connected with a valve through a pipeline, namely the outflow and backflow valves are communicated with the pressing galleries to form a (M + N) group outflow water channel and a (M + N) group backflow water channel; the wave flow water pool is connected with an L-shaped outflow pressing gallery through a water outflow channel, and is connected with an L-shaped backflow pressing gallery through a backflow water channel, the L-shaped backflow pressing gallery is communicated with the L-shaped outflow pressing gallery through a plurality of groups of pumping water channels, and the pumping water channels are sequentially connected with a bidirectional axial flow pump, a flowmeter and a flow-making pump pipeline valve through pipelines; the valve gallery is arranged at the outer edge of the wave flow water pool and the upper part of the pressing gallery, has no water therein and is used for installing and operating outflow and backflow valves; the flow velocity meter is arranged in a flow field required by an experiment in a wave flow water pool during experiment work and is used for monitoring the water flow velocity during flow making work.
The invention has the beneficial effects that: the omnidirectional flow-making device in the wave current pool and the method thereof have wide application range, the structure form is simple, the section shape of each building part is a rectangular or regular polygonal or circular structure, the construction is easy, and the omnidirectional flow-making device is suitable for the wave current pool with the flow-making working water depth from 0.2m to 3 m; when the two L-shaped pressing galleries work, the insides of the two L-shaped pressing galleries are filled with water and are communicated with the connected equipment only through pipelines, and the insides of the two L-shaped pressing galleries are isolated from the outside atmosphere, so that the inside of the two L-shaped pressing galleries has water pressure which is higher than the atmospheric pressure, and the existence of the water pressure can effectively ensure that the outflow of all parts of the pressing galleries is; the flow-making control method adopts expert experience type PID control, can simulate a constant flow velocity (or flow) field or a flow field which continuously changes along with time, can obtain a more accurate flow velocity (or flow) field, and ensures the reliability of experimental research results. In the wave current pool, the wave generator system is matched, so that the combined action of waves and a flow field can be realized, and the use requirement of hydrodynamic research on physical model experiments in the field of ocean engineering technical design and research at the present stage is met.
Drawings
FIG. 1 is a schematic diagram of the device of the present invention.
FIG. 2 is a flowchart of a control procedure of the present invention.
Fig. 3 is a schematic plan view of the apparatus of the present invention.
FIG. 4 is a schematic view of the inventive apparatus in section 1-1.
FIG. 5 is a schematic view of the inventive apparatus in section 2-2.
In the figure: 1. the device comprises a wave flow water pool, 2, a pressure gallery, 2a, an outflow pressure gallery, 2b, a backflow pressure gallery, 3, a flow equalizing zone, 3a, an outflow flow equalizing zone, 3b, a backflow flow equalizing zone, 4, an outflow and backflow port in the water pool, 4a, an outflow port, 4b, a backflow port, 5, a valve gallery, 6, a bidirectional axial flow pump, 7, an outflow and backflow valve, 7a, an opened outflow valve, 7b, a closed outflow valve, 7c, an opened backflow valve, 7d, a closed backflow valve, 8, a flow making pump pipeline valve, 9, a flowmeter, 10, a flow meter, 11, a flow field required by experiments, 12 and a water flow direction.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, an omnidirectional flow-making device in a wave flow water pool comprises a wave flow water pool 1, an "L" type outflow pressing gallery 2a, an "L" type backflow pressing gallery 2b, M + N outflow uniform flow areas 3a, M + N backflow uniform flow areas 3b, M + N in-pool outflow ports 4a, M + N in-pool backflow ports 4b, N open and M closed outflow valves 7a and 7b, N open and M closed backflow valves 7c and 7d, a valve gallery 5, a plurality of bidirectional axial flow pumps 6, a plurality of flow-making pump pipeline valves 8, a plurality of flow meters 9, and a flow rate meter 10. The wave flow water pool 1 is positioned on the uppermost layer of the whole device, the L-shaped outflow pressing gallery 2a and the L-shaped backflow pressing gallery 2b are arranged on the lower part of the outer edge of the wave flow water pool 1 in an opposite buckling and encircling manner, the total 2(M + N) outflow and backflow uniform flow areas 3a and 3b are independent from each other and are uniformly distributed on the four sides of the lower layer of the wave flow water pool 1, one end of each uniform flow area is opened, namely the outflow opening 4a and the backflow opening 4b are positioned on the bottom surface of the wave flow water pool 1, and the other end of each uniform flow area is connected with the outflow and backflow valve 7 through a pipeline and then is communicated with the pressing gallery 2 to form a (M + N) group outflow water channel and a (M + N) group backflow water channel; the wave flow water pool 1 is connected with an L-shaped outflow pressing gallery 2a through a water outflow channel, and is connected with an L-shaped backflow pressing gallery 2b through a backflow water channel, the L-shaped backflow pressing gallery 2b is communicated with the L-shaped outflow pressing gallery 2a through a plurality of groups of pumping water channels, and the pumping water channels are sequentially connected with a bidirectional axial-flow pump 6, a flowmeter 9 and a flow making pump pipeline valve 8 through pipelines; the valve gallery 5 is arranged at the outer edge of the wave flow water pool 1 and the upper part of the pressing gallery 2, has no water therein and is used for installing and operating an outflow valve 7 and a backflow valve 7; the flow velocity meter 10 is arranged in a flow field 11 required by an experiment in the wave flow water tank 1 during the experiment work, and is used for monitoring the water flow velocity during the flow making work. The wave flow water pool 1 is an experimental area for arranging a model and forming a wave and flow field; firstly, the wave flow water pool 1 and the bidirectional axial flow pump 6 for driving water flow are taken as boundary points to distinguish outflow from backflow: in a flow field 11 required by an experiment, a forward flow field is generated, when the flow direction is 12, a pressing gallery 2 pumped with water is called as an outflow pressing gallery 2a, N open valves connected with the pressing gallery 2 are outflow valves 7a, and by analogy, water flows through N independent outflow uniform flow areas 3a, flows out of N outflow ports 4a, enters a wave flow water pool 1 to form the flow field 11 required by the experiment, sequentially flows into N independent backflow uniform flow areas 3b from N backflow ports 4b and an open backflow valve 7c independently connected with the backflow uniform flow areas, flows back to the backflow pressing gallery 2b, and then flows into a bidirectional axial-flow pump 6; when a reverse flow field is generated, namely the direction of the water flow is opposite to the direction 12, the backflow is changed into outflow, and the outflow is changed into backflow; forming a closed loop circulating water flow. In the figure, 7b and 7d respectively show M closed outflow valves and M closed return valves outside the flow field 11 required for the experiment. As shown in fig. 3, at the inside of the wave-current water pool 1, the N corresponding outflow valves 7 and the N opposite backflow valves 7 in the flow field 11 required by the experiment are opened, and the 2M outflow and backflow valves 7 outside the flow field are closed; for forward and reverse flows in the same flow field, the forward and reverse flows can be realized by changing the steering of the bidirectional axial flow pump 6; as the outflow valves and the backflow valves 7 are uniformly arranged on the four sides of the wave flow water pool 1, the valves are opened through opposite combination, the valves are not needed, and the forward flow or the reverse flow is formed in the flow field by matching with the steering control of the bidirectional axial flow pump 6, so that the flow field 11 required by the experiment in any flow direction can be formed in the wave flow water pool 1, and the omnidirectional flow generation is realized.
As shown in fig. 2, the change of the flow velocity (or flow rate) in the flow field required by the experiment is realized by the control program according to the flow chart. Firstly, a user specifies the experimental water depth in the water tank, the flow field width required by the experiment and a flow velocity (or flow) value U (positive represents positive flow and negative represents reverse flow) to be achieved; selecting corresponding PID control parameters from a parameter expert library by a program according to given water depth and flow field width, and calculating an output control base value U (n) according to a set flow velocity (or flow) value U and a control time interval and linear interpolation; the feedback initial value e (0) is collected, and after the control initial value U (0) is output, the main loop is entered: collecting feedback values e (n), calculating next output control values U (n) according to the formulas (1) and (2), judging whether U (n) is equal to U (n) (actually judging whether U (n) is between [ U (n-1) + U (n) ]/2 and [ U (n) + U (n +1) ]/2), if not, outputting U (n), if not, outputting current values U (n-1), and then collecting, calculating and judging again until a command of stopping flow generation is obtained.
As shown in fig. 3 to 5, a schematic plan layout and a schematic cross-sectional view of an apparatus according to an embodiment of the present invention are provided, and the apparatus includes a wave flow water tank 1, a pressure gallery 2, a flow equalizing region 3, an outflow (backflow) port 4 in the water tank, a valve gallery 5, a bidirectional axial-flow pump 6, and an outflow (backflow) portFlow) valve 7, flow-making pump pipeline valve 8, flowmeter 9, flow meter 10, etc. In the embodiment, the wave current pool 1 is 70m long, 50m wide, 3m deep and 2m deep at maximum working water depth, and has strong anti-seepage and anti-pressure capability as the reinforced concrete structures are adopted in the pressure gallery 2 and the flow equalizing zone 3; the diameter of the bidirectional axial flow pump 6 is 800mm, and the flow of each pump is 1.5m3S, 6 in number; the outflow (return) valves 7 are 600mm in diameter and 94 in number.
An omnidirectional flow generation method in a wave current pool comprises a flow generation method for controlling the flow direction of water flow and a flow generation method for controlling the flow speed or flow of the water flow, wherein the flow generation method for controlling the flow direction of the water flow comprises the following steps: the flow field required by the experiment is generated in the wave flow water pool, N outflow valves and corresponding N backflow valves in the flow field required by the experiment in the wave flow water pool are opened, M outflow valves and corresponding M backflow valves outside the flow field required by the experiment are closed, and the selection of the direction of a certain flow field is realized; the method comprises the following steps: backflow water in a flow field required by an experiment enters respective backflow flow equalizing regions through N backflow ports in the wave flow pool, enters an L-shaped backflow pressing gallery through an opened backflow valve connected with the N backflow flow equalizing regions, passes through a bidirectional axial flow pump controlled by a computer, is pumped into the L-shaped outflow pressing gallery, enters respective outflow flow equalizing regions through N opened outflow valves, flows out of the outflow ports of the N outflow flow equalizing regions after being subjected to flow stabilization and flow equalization, enters the wave flow pool, forms closed-loop water flow, and realizes selection of forward flow field directions; if the selection of the reverse flow field direction is realized, the reversing of the bidirectional axial flow pump is changed, the backflow is changed into outflow, and the outflow is changed into backflow; the method comprises the following steps: the outflow opening is changed into a backflow opening, the outflow equalizing area is changed into a backflow equalizing area, the outflow valve is changed into a backflow valve, the outflow pressing gallery is changed into a backflow pressing gallery, the backflow valve is changed into an outflow valve, the backflow equalizing area is changed into an outflow equalizing area, the backflow opening is changed into an outflow opening, the working process is repeated, closed-loop water flow is formed, and the selection of the reverse flow field direction is realized; the flow making system is provided with 2(M + N) outflow and backflow valves, 2(M + N) outflow and backflow flow equalizing areas, 2(M + N) outflow and backflow ports, 2L-shaped pressure galleries, and M, N are natural numbers.
The flow making method for controlling the flow rate or flow of water flow comprises the following steps: the control computer is controlled to run a control program to generate a control signal, the output of the frequency converter is controlled through the control network, the rotating speed of the motor of the bidirectional axial-flow pump is adjusted, the flow velocity or flow of water flow is controlled, and therefore the flow velocity or flow of a flow field required by an experiment is controlled; in the control process, a feedback mechanism is used, namely data measured by a flow meter is selected as feedback control quantity to participate in flow rate control, or data measured by a flow meter is selected as feedback control quantity to participate in flow control; the core of the computer running control program is a control algorithm, an output control value is described by a formula (1),
u(n)＝U(n)+Δu(n) (1)
wherein U (n) represents an output control value, U (n) represents an output control base value, a given system final value U and a control time interval are set by a user and calculated according to linear interpolation, delta U (n) represents an output correction increment, an incremental digital PID control expression is adopted to describe through a formula (2),
Δu(n)＝Kp[e(n)-e(n-1)]+Kie(n)+Kd[e(n)-2e(n-1)+e(n-2)](2)
wherein e (n) represents a feedback value, i.e. an actual measured value of the flow rate or flow of the system, KpExpressing the proportional feedback coefficient, KiRepresenting the integral feedback coefficient, KdRepresents a differential feedback coefficient, wherein the system initial value u (0), e (0) is given by the measured value in the initial state of the system, Kp、Ki、KdWhen the system is debugged, the flow velocity or flow is set from small to large according to different water depths and different flow field widths in a segmented mode, a parameter value-taking expert library under all levels of water depths and flow field widths is established, and when the system is actually controlled and output, corresponding K is selected from the expert library in a grading mode according to the set water depths and the flow field widthsp、Ki、KdAnd (4) parameters.
The invention has the advantages that: (1) an omnidirectional flow field can be formed in the wave flow pool, (2) the double L-shaped pressing galleries can effectively ensure balanced and stable outflow, and (3) the flow making system automatically controlled by a computer program can simulate a fixed flow speed (or flow) field and can also simulate a continuously variable flow speed (or flow) field. The set flow rate value is a value that can be varied at certain time intervals (not control time intervals), such as simulating tidal flow near the coast, the flow rate and direction of flow of which vary with time. Therefore, the control method can realize automatic control of the change of the flow velocity (or the flow) and the change of the flow direction (from the positive direction to the reverse direction) in a flow making process, and (4) the application of an expert empirical PID control algorithm can ensure that the simulation of a flow field is more accurate and stable.
Claims (2)
1. An omnidirectional flow generation method in a wave current pool comprises a flow generation method for controlling the flow direction of water flow and a flow generation method for controlling the flow speed or flow of the water flow, and is characterized in that: the flow making method for controlling the flow direction of the water flow comprises the following steps: the flow field required by the experiment is generated in the wave flow water pool, N outflow valves and corresponding N backflow valves in the flow field required by the experiment in the wave flow water pool are opened, M outflow valves and corresponding M backflow valves outside the flow field required by the experiment are closed, and the selection of the direction of a certain flow field is realized; the method comprises the following steps: backflow water in a flow field required by an experiment enters respective backflow flow equalizing regions through N backflow ports in the wave flow pool, enters an L-shaped backflow pressing gallery through an opened backflow valve connected with the N backflow flow equalizing regions, passes through a bidirectional axial flow pump controlled by a computer, is pumped into the L-shaped outflow pressing gallery, enters respective outflow flow equalizing regions through N opened outflow valves, flows out of the outflow ports of the N outflow flow equalizing regions after being subjected to flow stabilization and flow equalization, enters the wave flow pool, forms closed-loop water flow, and realizes selection of forward flow field directions; if the selection of the reverse flow field direction is realized, the reversing of the bidirectional axial flow pump is changed, the backflow is changed into outflow, and the outflow is changed into backflow; the method comprises the following steps: the outflow opening is changed into a backflow opening, the outflow equalizing area is changed into a backflow equalizing area, the outflow valve is changed into a backflow valve, the outflow pressing gallery is changed into a backflow pressing gallery, the backflow valve is changed into an outflow valve, the backflow equalizing area is changed into an outflow equalizing area, the backflow opening is changed into an outflow opening, the working process is repeated, closed-loop water flow is formed, and the selection of the reverse flow field direction is realized; the flow making system is provided with 2(M + N) outflow and backflow valves, 2(M + N) outflow and backflow flow equalizing areas, 2(M + N) outflow and backflow ports, 2L-shaped pressure galleries and M, N which are natural numbers;
the flow making method for controlling the flow rate or flow of water flow comprises the following steps: the control computer is controlled to run a control program to generate a control signal, the output of the frequency converter is controlled through the control network, the rotating speed of the motor of the bidirectional axial-flow pump is adjusted, the flow velocity or flow of water flow is controlled, and therefore the flow velocity or flow of a flow field required by an experiment is controlled; in the control process, a feedback mechanism is used, namely data measured by a flow meter is selected as feedback control quantity to participate in flow rate control, or data measured by a flow meter is selected as feedback control quantity to participate in flow control; the core of the computer running control program is a control algorithm, an output control value is described by a formula (1),
u(n)＝U(n)+Δu(n) (1)
wherein U (n) represents an output control value, U (n) represents an output control base value, a given system final value U and a control time interval are set by a user and calculated according to linear interpolation, delta U (n) represents an output correction increment, an incremental digital PID control expression is adopted to describe through a formula (2),
Δu(n)＝Kp[e(n)-e(n-1)]+Kie(n)+Kd[e(n)-2e(n-1)+e(n-2)](2)
wherein e (n) represents a feedback value, i.e. an actual measured value of the flow rate or flow of the system, KpExpressing the proportional feedback coefficient, KiRepresenting the integral feedback coefficient, KdRepresents a differential feedback coefficient, wherein the system initial value u (0), e (0) is given by the measured value in the initial state of the system, Kp、Ki、KdWhen the system is debugged, the flow speed or flow is set in sections from small to large according to different water depths and different flow field widths, and the water depths and the flow rates of all stages are establishedThe parameter value expert database under the flow field width, when the actual control is output, according to the set water depth and the flow field width, corresponding K is selected from the expert database according to the water depth and the flow field width in a grading wayp、Ki、KdAnd (4) parameters.
2. The apparatus of claim 1, comprising a wave flow basin, an "L" outflow gallery, an "L" backflow gallery, an (M + N) outflow equal flow zones, an (M + N) backflow equal flow zones, an (M + N) in-basin outflow port, an (M + N) in-basin backflow port, an N open and M closed outflow valves, an N open and M closed backflow valves, a valve gallery, a plurality of bi-directional axial flow pumps, a plurality of flow-making pump plumbing valves, a plurality of flow meters and a flow meter, wherein: the wave flow water pool is positioned on the uppermost layer of the whole device, the L-shaped outflow pressing gallery and the L-shaped backflow pressing gallery are arranged on the lower part of the outer edge of the wave flow water pool in an opposite buckling and encircling manner, the total 2(M + N) outflow and backflow uniform flow areas are independent from each other and uniformly distributed on the four sides of the lower layer of the wave flow water pool, one end of each uniform flow area is opened, namely an outflow opening and a backflow opening are positioned on the bottom surface of the wave flow water pool, and the other end of each uniform flow area is connected with a valve through a pipeline, namely the outflow and backflow valves are communicated with the pressing galleries to form a (M + N) group outflow water channel and a (M + N) group backflow water channel; the wave flow water pool is connected with an L-shaped outflow pressing gallery through a water outflow channel, and is connected with an L-shaped backflow pressing gallery through a backflow water channel, the L-shaped backflow pressing gallery is communicated with the L-shaped outflow pressing gallery through a plurality of groups of pumping water channels, and the pumping water channels are sequentially connected with a bidirectional axial flow pump, a flowmeter and a flow-making pump pipeline valve through pipelines; the valve gallery is arranged at the outer edge of the wave flow water pool and the upper part of the pressing gallery, has no water therein and is used for installing and operating outflow and backflow valves;
the flow velocity meter is arranged in a flow field required by an experiment in a wave flow water pool during experiment work and is used for monitoring the water flow velocity during flow making work.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311880A (en) * | 2021-05-17 | 2021-08-27 | 天津大学 | Automatic flow field uniformity adjusting device of large-scale flow-making water pool based on Pascal principle |
| CN113311880B (en) * | 2021-05-17 | 2023-09-12 | 天津大学 | Automatic flow field uniformity adjusting device for large-scale flow-making water tank based on Pascal principle |
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