Flow guide device suitable for side type two-way inflow pump station and optimization method of flow guide device

Abstract

The invention relates to the technical field of water conservancy projects, in particular to a flow guiding device suitable for a side-type bidirectional inflow pump station and an optimization method thereof.The flow guiding device comprises a lifting unit, and the lifting unit comprises a telescopic assembly, a lifting assembly arranged on the inner side of the telescopic assembly and driving assemblies arranged at the two ends of the lifting assembly; and the transportation unit comprises a transportation assembly arranged on the lower side of the pump station forebay. The device has the beneficial effects that through the arrangement of the main body component and the conveying component, after the device is applied to the side type two-way inflow pump station, the inflow flow state of water flow in a forebay of the pump station can be improved, adverse flow states such as backflow, bias flow and vortex can be reduced, and energy loss can be reduced under the working condition that flow comes from the two sides of a river. Meanwhile, the water inlet flow state of the water pump can be improved, impact of water flow on the internal structure of the pump station is reduced, and therefore the operation efficiency, safety and stability of the pump station are improved.

Description

Technical Field

[0001] The invention relates to the technical field of water conservancy engineering, and in particular to a flow guide device suitable for a side-type bidirectional inflow pump station and an optimization method thereof. Background Art

[0002] The forebay is an important water inlet structure in the pump station project. Its main function is to ensure that the water flows smoothly into the inlet pool, reduce hydraulic losses, and create good operating conditions for the operation of the pump unit. Therefore, its water flow state will directly affect the hydraulic performance of the inlet pool, and then affect the performance of the pump unit. Due to the influence of factors such as geographical location and drainage requirements, the layout of the forebay of the pump station sometimes adopts the form of lateral inflow. Under this arrangement condition, the mainstream of the forebay often has a large angle and when the direction of the river water changes, the hydraulic characteristics in the forebay will also change accordingly. The large deflection angle often easily leads to undesirable flow patterns in the forebay or the inlet pool, such as deflection, folding, vortex, siltation, etc., which affect the safe and economic operation of the pump unit. Therefore, for pump stations with side layout and two-way inflow, it is particularly important to deeply study their inlet flow patterns and optimize their structural design.

[0003] At present, most of the research on the optimization of the water flow pattern of the side-inlet pump station focuses on the optimization of the rectification technology for a single flow direction and all of them are fixed structures, such as diversion walls, columns, sills, vortex elimination plates and other rectification components, which can improve the water flow pattern of the side pump station with a single flow direction. However, for the side pump station, especially the side pump station arranged vertically with the diversion river, the flow direction is often not fixed, and the conventional fixed rectification device can only be applied to the operating conditions of a single flow direction. When the flow direction of the diversion river changes, the conventional fixed rectification device often cannot achieve the expected rectification effect.

[0004] Therefore, in order to optimize the water inlet conditions of the side-type bidirectional inlet pump station, it is necessary to comprehensively consider the water flow distribution characteristics of non-single flow directions and find a rectifier device that can make applicable adjustments and improve the water inlet flow state of the pump station under both flow conditions. Summary of the invention

[0005] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the object of the present invention is to provide a flow guide device suitable for a side-type bidirectional inlet pump station, which can take into account two incoming flow directions and achieve a better rectification effect in the side-type bidirectional inlet pump station project.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: A flow guide device suitable for a side-type bidirectional inflow pump station, comprising a lifting unit, including a telescopic assembly, a lifting assembly arranged inside the telescopic assembly, and a driving assembly arranged at both ends of the lifting assembly;

[0008] The transport unit comprises a transport component arranged at the lower side of the forebay of the pump station.

[0009] As a preferred solution of the flow guide device applicable to the side-type bidirectional inflow pump station of the present invention, wherein: the telescopic assembly comprises two sets of drive plates, and a telescopic housing arranged between the two sets of drive plates;

[0010] The lifting shell is nearly semi-elliptical, and its outer wall panel is made of a lightweight and bending-resistant composite material.

[0011] As a preferred solution of the flow guide device applicable to the side-type bidirectional inflow pump station of the present invention, wherein: the lifting assembly includes a base arranged on the inner side of the driving plate, a pneumatic cylinder fixedly connected to the base, and a scissor frame arranged on the lower side of the control body;

[0012] The two groups of driving plates are respectively arranged on the top layer and the bottom layer of the lifting body, and the two groups of driving plates have the same specifications. Taking the vertical projection plane as a reference, the driving plates and the lifting body have the same shape.

[0013] As a preferred solution of the flow guide device suitable for a side-type bidirectional inlet pump station of the present invention, the driving assembly includes a square groove arranged on the edge of the driving plate, a driving motor arranged on the inner side of the square groove, a motor shaft arranged at one end of the driving motor, and a driving gear fixedly connected to the motor shaft.

[0014] As a preferred solution of the flow guide device applicable to the side-type bidirectional inlet pump station of the present invention, the transport component includes a U-shaped transport channel arranged on the lower side of the front pool of the pump station, and a transport rack arranged on the inner side of the U-shaped transport channel.

[0015] As a preferred solution of the flow guide device suitable for the side-type bidirectional inlet pump station of the present invention, the scissor frame is composed of a plurality of scissor walls, which are hingedly connected to form a liftable frame structure, and the two ends of the scissor frame are respectively connected to the pneumatic cylinders arranged in the upper and lower driving plates, and the rising and falling thereof are controlled by the pneumatic cylinders; a PLC controller is arranged in the pneumatic cylinder, which controls the operation of the pneumatic cylinder by receiving remote control signals to drive the extension and retraction of the scissor frame; 6 racks are arranged in the wall of the transport channel, and the racks correspond to the gears on the outer ring of the driving plate, that is, the gear teeth of the two components are fully meshed, and based on the horizontal projection, the 6 racks are all U-shaped.

[0016] In order to solve the above technical problems, the present invention also provides the following technical solutions: A method for optimizing the structure of a diversion device includes using a turbulence model with a high deflection angle to simulate the water flow distribution of the sluice station combined with the project, predicting the flow route and distribution of the water flow after entering, and calculating the water flow return situation;

[0017] The vortex reference method is used to optimize the profile design of the flow separation section and the drainage section, and an engineering model is established according to the position of the vortex core, and all the generated vortex cores are analyzed and recorded.

[0018] As a preferred solution of the structural optimization method of the flow guide device of the present invention, wherein: the turbulence model with a high deflection angle includes:

[0019] The k-ε model and SIMPLEC algorithm are used to solve the water flow distribution of the sluice station combined with the project, and the model constant is expanded by 0.1 times. At the same time, the k equation reflecting the turbulent kinetic energy and the ε equation reflecting the turbulent kinetic energy dissipation rate are introduced. The equation group is as follows:

[0020]

[0021] Among them, G k is the generation term of turbulent kinetic energy k caused by the average velocity gradient, and its calculation formula is:

[0022]

[0023] The model constant is C 1ε =1.51, C 2ε =2.08, C μ =0.12,σ k =1.10,σ ε =1.44.

[0024] As a preferred solution of the structural optimization method of the flow guide device of the present invention, the vortex reference method includes:

[0025] CFD numerical virtual simulation calculation is carried out for the original engineering model without rectification measures, with η as the velocity uniformity of the forward flow section of the 1# pump unit and is the average flow velocity of the forward flow section of the 1# pump unit, n is the flow velocity of the forward flow section calculation unit of the 1# pump unit, and n is the number of calculation units of the forward flow section of the 1# pump unit. The following formula is used for simulation calculation to calculate the (x, y) point group of the vortex core position of the main vortex in the front pool of the 1# unit, and simulate the engineering water inlet flow pattern under each sample:

[0026]

[0027] Then, the area S occupied by the vortex core area at each vortex core position, the depth A and E of the vortex core area, and the impeller diameter D of the corresponding water pump unit are brought in to calculate the vortex strength of each vortex core point during the vortex evolution process at different time periods. The calculation formula is as follows:

[0028]

[0029] According to the vortex core position and the strength of each vortex core point described in the above formula, the sample calculation grid is divided. On the basis of the weight method, the vortex intensity is used as the sample scheme design indicator. The calculation sample database is constructed through the geometric weight division of the plane area. The vortex intensity of each vortex core point in different time periods obtained according to the above formula is arranged from large to small. The middle 40% of the intensity values ​​are defined as the medium vortex intensity area, and the remaining 30% are defined as the low vortex intensity area. 70% of the grids in the area where the vortex core occurs are in the medium vortex intensity and 50% of the grids in the area where the vortex core occurs are in the low vortex intensity are included in the calculation sample database.

[0030] As a preferred solution of the structural optimization method of the flow guide device of the present invention, the profile design optimization method includes:

[0031] According to the calculation sample database, design the line parameter scheme, and based on the constraints of a>1.6J, b>1.05L, r=a, adopt the central composite design method, take the line parameters a, b, r as design variables, and generate the line parameter a, b, r scheme database under different vortex core point positions. In the scheme database, establish the corresponding three-dimensional model;

[0032] The GA-BP algorithm is used to construct a regression model between the plane profile parameters of the telescopic shell and the driving plate and the research indicators. The GA algorithm is then used to perform a global search and optimization on the research indicators to obtain the corresponding profile parameter values ​​under the optimal indicator values.

[0033] Beneficial effects of the present invention: Through the arrangement of the main body components and the transport components, the present invention enables the device to be applied to the side-type bidirectional inflow pump station, and can improve the water inflow state of the water flow in the forebay of the pump station under the working conditions of the incoming flow on both sides of the diversion river, reduce the adverse flow states such as backflow, bias flow and vortex, and reduce energy loss. At the same time, it can also improve the water inflow state of the water pump, reduce the impact of the water flow on the internal structure of the pump station, and thus improve the operation efficiency and safety and stability of the pump station. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0035] Figure 1 It is a schematic diagram of the overall structure of the two states of the diversion device suitable for the side-type bidirectional inlet pump station.

[0036] Figure 2 The diagram is a partial structural diagram of a driving component of a flow guide device suitable for a side-type bidirectional inlet pump station.

[0037] Figure 3 The figure is a schematic diagram of the moving path of the lifting unit of the flow guide device suitable for the side-type bidirectional inlet pump station.

[0038] Figure 4 The diagram is a structural diagram of a transport unit of a flow guide device suitable for a side-type bidirectional inlet pump station.

[0039] Figure 5 The figure is a schematic diagram of the installation position of the flow guide device suitable for the side-type bidirectional inlet pump station according to different flow directions.

[0040] Figure 6 The line graph is a comparison of flow velocity uniformity before and after optimization.

[0041] Figure 7 It is a schematic diagram of the structure of the use status of the diversion device suitable for the side-type bidirectional inlet pump station.

[0042] Figure 8 The flow diagram of the forebay before (left) and after (right) the improvement of the side-type bidirectional inlet pump station.

[0043] Fig. 9 This is the plane line parameter diagram of the telescopic component of the side-type bidirectional inlet pump station.

[0044] Fig.10 Flowchart for optimizing BP neural network using genetic algorithm. DETAILED DESCRIPTION

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0046] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0047] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0048] Example 1

[0049] Reference Figure 1 to Figure 6, which is the first embodiment of the present invention, provides a flow guide device suitable for a side-type bidirectional inlet pump station, which can take into account two incoming flow directions and achieve a better rectification effect in the side-type bidirectional inlet pump station project.

[0050] Specifically, the lifting unit 100 includes a telescopic component 101, a lifting component 102 disposed inside the telescopic component 101, and a driving component 103 disposed at both ends of the lifting component 102;

[0051] The transport unit 200 includes a transport component 201 disposed at the lower side of the forebay of the pump station.

[0052] Furthermore, the telescopic assembly 101 includes two sets of driving plates 101a, and a telescopic housing 101b disposed between the two sets of driving plates 101a, wherein the two sets of driving plates 101a are fixedly connected to the telescopic housing 101b at the same time;

[0053] The lifting shell is nearly semi-elliptical, and its outer wall panel is made of a lightweight and bending-resistant composite material.

[0054] Furthermore, the lifting assembly 102 includes a base 102a disposed inside the driving plate 101a, a pneumatic cylinder fixedly connected to the base 102a, and a scissor frame 102b disposed on the lower side of the control body;

[0055] The two groups of driving plates 101a are respectively arranged on the top layer and the bottom layer of the lifting body, and the two groups of driving plates 101a have the same specifications. Taking the vertical projection plane as a reference, the driving plates 101a and the lifting body have the same shape.

[0056] Furthermore, the driving assembly 103 includes a square groove 103a arranged on the edge of the driving plate 101a, a driving motor 103b arranged on the inner side of the square groove 103a, a motor shaft 103c arranged at one end of the driving motor 103b, and a driving gear 103d fixedly connected to the motor shaft 103c, wherein the square groove 103a is a through groove, and its length is adapted to the tooth width of the driving gear 103d, gaskets are provided on both sides of the driving gear 103d to reduce wear, and an inner groove opened on the inner side of the driving plate 101a is connected to one side of the square groove 103a, and the size of the inner groove is adapted to the outer diameter of the driving motor 103b.

[0057] Furthermore, the transport component 201 includes a U-shaped transport channel 201a arranged at the lower side of the pump station front pool, and a transport rack 201b arranged on the inner side of the U-shaped transport channel 201a, wherein the transport rack 201b is a U-shaped rack adapted to the U-shaped transport channel 201a, and the transport rack 201b is fixedly connected to the inner side of the U-shaped transport channel 201a.

[0058] It should be noted that the transport rack 201b is meshed with the driving gear 103d.

[0059] Preferably, the scissor frame 102b is composed of multiple scissor walls, which are hingedly connected to form a liftable frame structure, and the two ends of the scissor frame 102b are respectively connected to the pneumatic cylinders provided in the upper and lower driving plates 101a, and the rising and falling of the scissor frame 102b are controlled by the pneumatic cylinders; a PLC controller is provided in the pneumatic cylinder, which controls the operation of the pneumatic cylinder by receiving remote control signals to drive the extension and retraction of the scissor frame 102b; 6 racks are provided in the wall of the transport channel, and the racks correspond to the gears on the outer ring of the driving plate 101a, that is, the gear teeth of the two components are fully meshed, and based on the horizontal projection, the 6 racks are all U-shaped.

[0060] It should be noted that the PLC controls the extension and retraction of the pneumatic cylinders on both sides through remote programming, and can also control the start and stop of the drive motor 103b, so that the running time of the drive motor 103b from start to stop is equal to the movement time of the telescopic component 101 from one end of the U-shaped transport channel 201a to the other end. At the same time, the staff can also operate the PLC to manually remotely control the start and stop of the pneumatic cylinder and the drive motor 103b.

[0061] When in use, the staff fixedly connects the U-shaped transport channel 201a to the bottom of the pump station forebay, so that the two ends of the U-shaped transport channel 201a are respectively in contact with the straight edges of the interface of the bottom plate of the pump station forebay and the outer wall surface of the wing wall of the pump station forebay. When the water flow direction of the diverted river is upward, the staff starts the drive motor 103b, controls the motor shaft 103c to rotate through the drive motor 103b, and the motor shaft 103c drives the drive gear 103d to rotate synchronously in the same direction. The drive gear 103d moves upward along the transport rack 201b through meshing, and at the same time, the movement of the drive gear 103d drives the drive plate 101a to move synchronously along the transport rack 201b. Moving in the same direction, the lifting assembly 102 is synchronously pushed to the top of the U-shaped transport channel 201a close to the incoming flow direction. When the lifting assembly 102 moves to the top, the driving motor 103b is turned off, so that the driving gear 103d on the lower side is statically supported on the transport rack 201b. Further, the staff controls the pneumatic cylinder at the bottom through the remote control PLC controller to push the scissor frame 102b upward, so that the scissor frame 102b drives the telescopic shell 101b to gradually extend to a fully stretched state. At this time, the lower 1 / 4 section of the telescopic shell 101b and the driving plate 101a below it are both stuck in the transport channel. When the telescopic shell 101b is extended to a fully stretched state, the staff controls the pneumatic cylinder to stop pushing through the PLC controller, and further part of the water flow in the diversion river flows along the original flow direction of the diversion river, and the remaining water flow "turns" and merges into the front pool of the pump station. After being rectified by the telescopic shell 101b, it merges into the water inlet pool of the pump station.

[0062] When the water flow direction of the diversion river is downward, the staff controls the pneumatic cylinder through the PLC controller to pull the scissor frame 102b downward, so that the scissor frame 102b drives the upper driving plate 101a to move downward, and at the same time drives the telescopic shell 101b to shrink downward to a fully compressed state. When the telescopic shell 101b is fully retracted, the staff controls the pneumatic cylinder to stop moving through the PLC, and further starts the drive motor 103b. The drive motor 103b drives the motor shaft 103c to rotate in the opposite direction, and the motor shaft 103c drives the drive gear 103d to rotate in the opposite direction. The drive gear 103d moves downward along the transport rack 201b through meshing, driving the telescopic assembly 101 to move along the U-shaped transport channel 201a to the top of the other end. When the telescopic assembly 1 When 01 is completely moved to the top of the other end of the U-shaped transport channel 201a, the driving motor 103b is turned off, so that the driving gear 103d on the lower side is stationary and supported on the transport rack 201b. The staff further controls the pneumatic cylinder through the PLC controller to push the scissors frame 102b upward. The scissors frame 102b pushes the driving plate 101a on the upper side to move upward, and at the same time pulls the telescopic shell 101b to extend to a fully stretched state. When the telescopic shell 101b is in a fully stretched state, the pneumatic cylinder is turned off, and part of the water flow in the diversion river flows along the original flow direction of the diversion river, and the remaining water flow "turns" and merges into the front pool of the pump station. After being rectified by the telescopic shell 101b, it merges into the water inlet pool of the pump station.

[0063] In summary, the present invention, through the arrangement of the main body components and the transport components, enables the device to be applied to the side-type bidirectional inflow pump station, and can improve the water inflow state of the water flow in the forebay of the pump station under the working conditions of the incoming flow on both sides of the diversion river, reduce the adverse flow states such as backflow, bias flow and vortex, and reduce energy loss. At the same time, it can also improve the water inflow state of the water pump, reduce the impact of the water flow on the internal structure of the pump station, and thus improve the operating efficiency and safety and stability of the pump station.

[0064] Example 2

[0065] Reference Figure 7 to Figure 10 , which is the second embodiment of the present invention, provides a structural optimization method for the guide device, which can optimize the guide device according to the position and strength of the vortex core to adapt it to most water flow distribution conditions.

[0066] Specifically, a turbulence model with a high deflection angle is used to simulate the water flow distribution of a side-type bidirectional inflow pump station, predict the flow route and distribution of the water after it enters, and calculate the water return flow;

[0067] The vortex reference method is used to optimize the profile design of the flow separation section and the drainage section. The calculation model is established based on the occurrence positions of different vortex cores and the established model is analyzed and recorded.

[0068] Furthermore, the turbulence model with high deflection angle includes:

[0069] The k-ε model and SIMPLEC algorithm are used to solve the water flow distribution of the sluice station combined with the project, and the model constant is expanded by 0.1 times. At the same time, the k equation reflecting the turbulent kinetic energy and the ε equation reflecting the turbulent kinetic energy dissipation rate are introduced. The equation group is as follows:

[0070]

[0071] Among them, G k is the generation term of turbulent kinetic energy k caused by the average velocity gradient, and its calculation formula is:

[0072]

[0073] The model constant is C 1ε =1.51, C 2ε =2.08, C μ =0.12,σ k =1.10,σ ε =1.44.

[0074] Further, the vortex reference method includes:

[0075] CFD numerical virtual simulation calculation is carried out for the original engineering model without rectification measures, with η as the velocity uniformity of the forward flow section of the 1# pump unit and is the average flow velocity of the forward flow section of the 1# pump unit, n is the flow velocity of the forward flow section calculation unit of the 1# pump unit, and n is the number of calculation units of the forward flow section of the 1# pump unit. The following formula is used for simulation calculation to calculate the (x, y) point group of the vortex core position of the main vortex in the front pool of the 1# unit, and simulate the engineering water inlet flow pattern under each sample:

[0076]

[0077] Then, the area S occupied by the vortex core area at each vortex core position, the depth A and E of the vortex core area, and the impeller diameter D of the corresponding water pump unit are brought in to calculate the vortex intensity F of each vortex core point during the vortex evolution process at different time periods. The calculation formula is as follows:

[0078]

[0079] According to the vortex core position and the strength of each vortex core point described in the above formula, the sample calculation grid is divided. On the basis of the weight method, the vortex intensity is used as the sample scheme design indicator. The calculation sample database is constructed through the geometric weight division of the plane area. The vortex intensity of each vortex core point in different time periods obtained according to the above formula is arranged from large to small. The middle 40% of the intensity values ​​are defined as the medium vortex intensity area, and the remaining 30% are defined as the low vortex intensity area. 70% of the grids in the area where the vortex core occurs are in the medium vortex intensity and 50% of the grids in the area where the vortex core occurs are in the low vortex intensity are included in the calculation sample database.

[0080] Furthermore, the profile design optimization method includes:

[0081] According to the calculation sample database, design the line parameter scheme, and based on the constraints of a>1.6J, b>1.05L, r=a, adopt the central composite design method, take the line parameters a, b, r as design variables, and generate the line parameter a, b, r scheme database under different vortex core point positions. In the scheme database, establish the corresponding three-dimensional model;

[0082] The GA-BP algorithm is used to construct a regression model between the plane profile parameters of the telescopic shell 101b and the driving plate 101a and the research index, and then the GA algorithm is used to perform a global search and optimization on the research index to obtain the corresponding profile parameter value under the optimal index value.

[0083] Specifically, the numerical simulation calculation of the present invention can use ANSYS computational fluid dynamics to simulate the water flow pattern of the side-type bidirectional water inlet pump station project and calculate the relevant hydraulic parameters. The calculation principle follows the flow mechanism of turbulent mechanics, and the relevant parameters are designed as follows:

[0084] Since the water flow density is a constant, it can be regarded as a fluid of constant viscosity and incompressibility, and the heat exchange of the water flow can be ignored, so the following continuity equation and momentum equation obtained by the law of conservation of mass and momentum can be selected to describe it.

[0085] Continuity equation:

[0086] Momentum equation:

[0087] Where: u i 、u j is the velocity vector in each direction, ρ is the fluid density, x i ,y i represents the coordinate axes; g is the acceleration due to gravity; p is the static pressure of turbulent kinetic energy; t is time; μ e ff is the effective viscosity coefficient of the fluid; i and j are vector directions.

[0088] In order to make the equations easier to solve, the k equation reflecting the turbulent kinetic energy and the ε equation reflecting the turbulent kinetic energy dissipation rate are introduced. Since the calculation model involved in the present invention is a turbulent model with a high deflection angle, the k-ε model and SIMPLEC algorithm are used to solve the water flow distribution of the sluice station combined with the project and the model constant is expanded by 0.1 times. The turbulent kinetic energy k equation and equation of the k-ε model are:

[0089]

[0090] is the generation term of turbulent kinetic energy k caused by the average velocity gradient, and its calculation formula is:

[0091]

[0092] All numerical simulation calculations involved in the present invention can be completed using the above-mentioned ANSYS computational fluid dynamics (CFD) software. The following related optimization index flow velocity uniformity is calculated by the following formula:

[0093]

[0094] Where η is the velocity uniformity of the forward flow section of the 1# pump unit, and the final calculated value is a percentage; V a is the average flow velocity of the forward flow section of the 1# pump unit, the flow velocity measurement unit is m / s, V ai is the flow rate of the calculation unit of the forward flow section of the 1# pump unit, and the flow rate measurement unit is m / s; n is the number of calculation units of the forward flow section of the 1# pump unit. Parameters V ai Both n and can be directly calculated in ANSYS computational fluid dynamics (CFD) software. The specific formula is as follows:

[0095]

[0096] Among them, Q represents the cross-sectional flow rate and A represents the cross-sectional area.

[0097] Furthermore, the profile design of the flow separation section and the drainage section of the present invention is optimized by the vortex reference method, which is to calculate and optimize the vortex core position (x, y) of the main vortex in the forebay of unit 1 under the unrectified condition, the vortex radius J, the span L of the vortex influence area and the vortex intensity T. The constraints are a>1.6J, b>1.05L, r=a and the vortex core position needs to be at Fig. 9 The specific calculation and implementation steps of the vortex reference method are as follows:

[0098] First, CFD numerical virtual simulation calculations were carried out for the original engineering model without rectification measures. The calculation method is as shown above, and based on the calculation results, the point group (x, y) of the vortex core position of the main vortex in the forebay of unit 1 was obtained.

[0099] Secondly, the vortex intensity of each vortex core point during the vortex evolution process at different time periods is calculated.

[0100] The calculation formula is as follows:

[0101] Where S is the area occupied by the vortex core area; A is the depth of the vortex core area, E is the distance from the vortex core to the pump station inlet section, and D is the impeller diameter of the corresponding water pump unit.

[0102] Next, divide the sample calculation grid. Based on the weighted total method, take the vortex strength as the sample scheme design indicator, and build a calculation sample database through the geometric weight division of the plane area. Divide the vortex core area shown in the figure into several square grids. The vortex strength of each vortex core point at different time periods is obtained, as shown in Fig. 9 As shown in the figure, they are arranged from large to small, and the first 30% are defined as high vortex intensity areas, the middle 40% are defined as medium vortex intensity areas, and the remaining 30% are defined as low vortex intensity areas. The center point of the grid is taken as the vortex core occurrence position. Based on the weight method, all grids in the area of ​​high vortex intensity where the vortex core occurs, 70% of the grids in the area of ​​medium vortex intensity where the vortex core occurs, and 50% of the grids in the area of ​​low vortex intensity where the vortex core occurs are included in the calculation sample database.

[0103] Next, design the profile parameter scheme, the component flow field calculation sample library, and establish the corresponding three-dimensional model. In the calculation sample database established in the above steps, based on the constraints of a>1.6J, b>1.05L, r=a, the central composite design method is adopted, and the profile parameters a, b, r are used as design variables to generate a profile parameter a, b, r scheme database under different vortex core point positions. In the scheme database, establish the main component three-dimensional model of all profile parameter schemes.

[0104] Secondly, based on CFD numerical virtual simulation, the engineering water inlet flow state under each sample is simulated and calculated.

[0105] Taking the velocity uniformity of the forward flow section of the 1# pump unit as the optimization index, the calculation formula is as follows:

[0106]

[0107] Where η is the velocity uniformity of the forward flow section of the 1# pump unit, is the average flow velocity of the forward flow section of the 1# pump unit, is the flow velocity of the calculation unit of the forward flow section of the 1# pump unit, and n is the number of calculation units of the forward flow section of the 1# pump unit.

[0108] According to calculation, the velocity uniformity of the forward flow section of the 1#~4# pump units from left to right (based on the direction of water flow) is better than that of the unrectified working condition. Figure 7 As shown, the improvements can be 61.45%, 5.75%, 3.41% and 2.67% respectively, indicating that the device of the present invention has an improving effect on the water inlet flow pattern of the pump unit of the side-inlet pump station, as shown in the following table:

[0109] Unrectified Rectification Improve the degree 45.53 73.51 61.45％ 71.32 75.42 5.75％ 77.44 80.08 3.41％ 81.05 83.21 2.67％

[0110] Finally, the GA-BP algorithm is used to build a regression model between the plane profile parameters of the telescopic shell 101b and the driving plate 101a and the research index, and then the GA algorithm is used to perform a global search and optimization on the research index to obtain the corresponding profile parameter value under the optimal index value;

[0111] Among them, in the process of model construction of GA-BP algorithm, it is necessary to first determine the number of neurons in the input layer and output layer of the neural network. The input layer selects the main control variables of each profile parameter, including a, b, r. The output layer parameter selects the velocity uniformity value of the forward flow section of the 1# pump unit under each sample scheme. The mapminmax function is called in Matlab software to normalize the sample data to between [-1,1]. The function expression is as follows:

[0112] [y,ps]=mapminmax(x)

[0113]

[0114] Where: y min =-1,y max =1;x max and x min are the maximum and minimum values ​​of each row of data in the sample original data matrix; x and y are the data before and after normalization respectively; ps is the matrix obtained by data normalization.

[0115] Furthermore, the genetic algorithm is used to optimize the BP neural network, and its fitness function is shown as follows:

[0116]

[0117] Where n is the number of training samples; is the expected output value of the ith sample; is the predicted output value of the ith sample. Among them, for samples with a small fitness function (good fitness), a high probability of 70% is given to the next generation, and conversely, for samples with a large fitness function (poor fitness), a low probability of 30% is given to the next generation. After multiple trials and iterations, a regression model between the plane line parameters of the telescopic shell 101b and the driving plate 101a and the research indicators is established. Its principle is as follows Fig.10 shown.

[0118] Finally, based on the above construction process, a single hidden layer GA-BP network is established. The gradient of the regression model at each point is obtained by continuous iteration of the optimized BP neural network. With a certain step length, the function's maximum value can be obtained by repeated iterations in the opposite direction of the gradient. Finally, the main parameter values ​​(a, b, r) of the profile corresponding to the optimal index value (flow velocity uniformity of the forward flow section of the 1# pump unit) are obtained, and the profile parameter values ​​corresponding to the optimal index value are obtained.

[0119] In summary, by gridding the vortex core occurrence area, a database is established for the vortex core occurrence location and intensity under unrectified conditions, and then the appearance of the guide device is modeled through the database. According to the cooperation of CFD numerical simulation, GA-BP algorithm and sample database, the structure of the guide device is optimized, so that the guide device can minimize the possibility of vortex formation due to water backflow, improve the efficiency and stability of the pump station operation, and reduce the possibility of impact damage caused by backflow impact.

[0120] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described in the application (e.g., mounting arrangements, use of materials, color, changes in orientation, etc.). For example, the element shown as integrally formed may be composed of a plurality of parts or elements, the position of the element may be inverted or otherwise changed, and the nature or number or position of the discrete element may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the present invention. The order or sequence of any process or method steps may be changed or reordered according to an alternative embodiment. In the claims, any "bracket plus function" clause is intended to cover the structure of the execution function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the present invention is not limited to a specific embodiment, but extends to a variety of modifications that still fall within the scope of the appended claims.

[0121] Additionally, in an effort to provide a concise description of example embodiments, all features of an actual implementation may not be described.

[0122] It should be understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but for those of ordinary skill having the benefit of this disclosure, the development effort will be a routine task of design, fabrication, and production without undue experimentation.

[0123] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A flow guide device suitable for a side-type bidirectional inflow pump station, characterized in that: include, A lifting unit (100) comprises a telescopic component (101), a lifting component (102) arranged inside the telescopic component (101), and a driving component (103) arranged at both ends of the lifting component (102); The transport unit (200) comprises a transport component (201) arranged at the lower side of the forebay of the pump station.

2. The flow guide device suitable for a side-type bidirectional inflow pump station according to claim 1, characterized in that: The telescopic assembly (101) comprises two groups of driving plates (101a) and a telescopic housing (101b) arranged between the two groups of driving plates (101a); The lifting shell is nearly semi-elliptical, and its outer wall panel is made of a lightweight and bending-resistant composite material.

3. The flow guide device suitable for a side-type bidirectional inflow pump station according to claim 2, characterized in that: The lifting assembly (102) comprises a base (102a) arranged inside the driving plate (101a), and a scissor frame (102b) arranged between the bases (102a); The two groups of driving plates (101a) are respectively arranged on the top layer and the bottom layer of the lifting body, and the two groups of driving plates (101a) have the same specifications. Taking the vertical projection plane as a reference, the driving plates (101a) and the lifting body have the same shape.

4. The flow guide device suitable for a side-type bidirectional inflow pump station according to claim 3, characterized in that: The driving assembly (103) comprises a square groove (103a) arranged at the edge of the driving plate (101a), a driving motor (103b) arranged inside the square groove (103a), a motor shaft (103c) arranged at one end of the driving motor (103b), and a driving gear (103d) fixedly connected to the motor shaft (103c).

5. The flow guide device suitable for a side-type bidirectional inflow pump station according to claim 4, characterized in that: The transport component (201) comprises a U-shaped transport channel (201a) arranged at the lower side of the forebay of the pump station, and a transport rack (201b) arranged at the inner side of the U-shaped transport channel (201a).

6. The flow guide device for a side-type bidirectional inflow pump station according to claim 5, characterized in that: The scissor frame (102b) is composed of a plurality of scissor walls, which are hingedly connected to form a liftable frame structure. The two ends of the scissor frame (102b) are respectively connected to the pneumatic cylinders provided in the upper and lower driving plates (101a), and the rising and falling of the scissor frame (102b) are controlled by the pneumatic cylinders. The pneumatic cylinder is provided with a PLC controller, which controls the operation of the pneumatic cylinder by receiving a remote control signal to drive the extension and retraction of the scissor frame (102b). The wall surface of the transport channel is provided with 6 racks, which correspond to the gears on the outer ring of the driving plate (101a), that is, the gear teeth of the two components are fully meshed, and based on the horizontal projection, the 6 racks are all U-shaped.

7. A method for optimizing the structure of a flow guide device, characterized in that: This includes using a high deflection angle turbulence model to simulate the water flow distribution of the sluice station combined with the project, predicting the flow route and distribution of the water after entering, and calculating the water return flow; The vortex reference method is used to optimize the profile design of the flow separation section and the drainage section, and an engineering model is established according to the position of the vortex core, and all the generated vortex cores are analyzed and recorded.

8. The structure optimization method of the flow guide device according to claim 7, characterized in that: The high deflection angle turbulence model includes: The k-ε model and SIMPLEC algorithm are used to solve the water flow distribution of the sluice station combined with the project, and the model constant is expanded by 0.1 times. At the same time, the k equation reflecting the turbulent kinetic energy and the ε equation reflecting the turbulent kinetic energy dissipation rate are introduced. The equation group is as follows: Among them, G k is the generation term of turbulent kinetic energy k caused by the average velocity gradient, and its calculation formula is: The model constant is C 1ε =1.51, C 2ε =2.08, C μ =0.12,σ k =1.10,σ ε =1.

44.

9. The method for optimizing the structure of the flow guiding device according to claim 8, characterized in that: The vortex reference method includes, CFD numerical simulation calculation is carried out for the original engineering model without rectification measures, with η as the velocity uniformity of the forward flow section of the 1# pump unit and is the average flow velocity of the forward flow section of the 1# pump unit, n is the flow velocity of the forward flow section calculation unit of the 1# pump unit, and n is the number of calculation units of the forward flow section of the 1# pump unit. The following formula is used for simulation calculation to calculate the (x, y) point group of the vortex core position of the main vortex in the front pool of the 1# unit, and simulate the engineering water inlet flow pattern under each sample: Then, the area S occupied by the vortex core area at each vortex core position, the depth A and E of the vortex core area, and the impeller diameter D of the corresponding water pump unit are brought in to calculate the vortex strength of each vortex core point during the vortex evolution process at different time periods. The calculation formula is as follows: According to the vortex core position and the strength of each vortex core point described in the above formula, the sample calculation grid is divided. On the basis of the weight method, the vortex intensity is used as the sample scheme design indicator. The calculation sample database is constructed through the geometric weight division of the plane area. The vortex intensity of each vortex core point in different time periods obtained according to the above formula is arranged from large to small. The middle 40% of the intensity values ​​are defined as the medium vortex intensity area, and the remaining 30% are defined as the low vortex intensity area. 70% of the grids in the area where the vortex core occurs are in the medium vortex intensity and 50% of the grids in the area where the vortex core occurs are in the low vortex intensity are included in the calculation sample database.

10. The structure optimization method of the flow guiding device according to claim 9, characterized in that: The profile design optimization method comprises: According to the calculation sample database, design the line parameter scheme, and based on the constraints of a>1.6J, b>1.05L, r=a, adopt the central composite design method, take the line parameters a, b, r as design variables, and generate the line parameter a, b, r scheme database under different vortex core point positions. In the scheme database, establish the corresponding three-dimensional model; A regression model between the plane profile parameters of the telescopic shell (101b) and the driving plate (101a) and the research index is constructed by the GA-BP algorithm, and then the GA algorithm is used to perform a global search and optimization on the research index to obtain the corresponding profile parameter value under the optimal index value.

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