Method and device for selecting water pump matching water in-out system

Abstract

The present application relates to the technical field of water conservancy pump station, and provides a water pump selection method and device matched with an inlet and outlet water system, comprising: determining the structure information of the inlet and outlet water system of a target pump station meeting the pump station engineering requirements under each water pump scheme, and constructing a pump station three-dimensional flow field calculation model according to the structure information of the inlet and outlet water system; under the conditions of the lowest lift, the design lift and the highest lift, performing flow field simulation calculation in the pump station three-dimensional flow field calculation model based on the water pump scheme under different flow conditions to determine the required lift curve of the target pump station under each pump type; determining the water pump working point under each water pump scheme according to the required lift curve and the water pump performance curve, and determining a first water pump scheme from the multiple water pump schemes according to the water pump working point, which can eliminate the mutual influence between the water pump and each flow structure of the inlet and outlet water system of the pump station to the greatest extent, ensures that the entire pump station system is in an optimal flow state, and thus the high-efficiency target of the water pump device is achieved.

Description

Technical Field

[0001] This invention relates to the field of water conservancy engineering pump station technology, and in particular to a method and apparatus for selecting water pumps to match inlet and outlet water systems. Background Technology

[0002] Pumps are the core equipment of pumping stations. Their performance directly affects the station's efficiency, safety, stability, energy consumption, and operating costs. Pump selection for irrigation and drainage pumping stations is generally based on flow rate, head, and a rough estimate of hydraulic losses, plus a certain margin for these parameters. This method often leads to inaccurate one-dimensional hydraulic loss estimations and inappropriate margin ranges, causing pumps to deviate from their design operating points and resulting in significant energy waste. Furthermore, the design of inlet and outlet structures is based on pumping station design standards and experience, without experimental or computational verification. Therefore, it cannot guarantee a favorable flow field and stable operation during operation. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention provides a method and apparatus for selecting a water pump to match an inlet and outlet water system.

[0004] In a first aspect, the present invention provides a method for selecting a water pump to match an inlet / outlet water system, comprising:

[0005] Based on the preset flow rate and head information of the target pumping station, multiple pump schemes that meet the engineering requirements of the pumping station are determined. The pump schemes include pump type and number of pumps.

[0006] Determine the structural information of the inlet and outlet water systems of the target pumping station that meet the engineering requirements of the pumping station under each pump scheme, and construct a three-dimensional flow field calculation model of the pumping station based on the structural information of the inlet and outlet water systems;

[0007] Under the conditions of minimum head, design head and maximum head, based on the pump scheme, the full flow field simulation calculation of the pump station under different flow conditions is carried out in the three-dimensional flow field calculation model of the pump station to determine the required head curve of the target pump station under each pump type.

[0008] Based on the required head curve and the pump performance curves of each pump type, the pump operating point under each pump scheme is determined, and based on the pump operating point, the first pump scheme is determined from multiple pump schemes.

[0009] In one embodiment, the method further includes:

[0010] Based on the structural information of the inlet and outlet water system of the target pumping station corresponding to the first water pump scheme, the flow field analysis of the inlet and outlet water system under the design flow condition is carried out in the three-dimensional flow field calculation model of the pumping station, and the structural information of the inlet and outlet water system is adjusted according to the analysis results.

[0011] In one embodiment, constructing a three-dimensional flow field calculation model of the pumping station based on the structural information of the inlet and outlet water system includes:

[0012] Based on the structural information of the water inlet and outlet system, a three-dimensional solid structure is constructed for the pump station's intake channel, forebay, inlet pool, inlet and outlet pipelines, and outlet pool. The computational domain mesh is discretized, and numerical methods and boundary conditions are set to obtain a three-dimensional flow field calculation model of the pump station for computational fluid dynamics numerical simulation.

[0013] In one embodiment, determining the required head curve for the target pumping station under various pump types includes:

[0014] The friction loss and local hydraulic loss of the pump station pipeline system are estimated using the loss calculation formula. Based on the friction loss and local hydraulic loss, the hydraulic loss curve of the target pump station under each pump type is determined. Based on the hydraulic loss curve and the preset net head, the required head curve of the target pump station under each pump type is determined.

[0015] The loss calculation formula includes:

[0016] ;

[0017] ;

[0018] ;

[0019] ;

[0020] in, Indicates hydraulic loss. , These represent hydraulic losses along the pipeline and local hydraulic losses within the pipeline, respectively. Indicates the density of water; g Represents gravitational acceleration; , and Representing cross-sections i The average static pressure, average velocity, and elevation of the center point of the cross section; This indicates the resistance coefficient of a local accessory in the pipeline; This indicates that a head is required; The net head represents the difference between the water level in the inlet pool and the water level in the outlet pool; 0 represents the cross-section of the outlet channel of the inlet system. m Indicates the inlet cross-section of the outlet pool;i This refers to a section between the outlet section of the diversion channel and the inlet section of the outlet pool; k This indicates the section where a local accessory of the pipeline is located between the outlet section of the diversion channel and the inlet section of the outlet pool.

[0021] In one embodiment, based on the structural information of the inlet and outlet water systems of the target pumping station corresponding to the first pumping scheme, flow field analysis is performed in the three-dimensional flow field calculation model of the pumping station under the design flow rate conditions within the inlet and outlet water systems. The structural information of the inlet and outlet water systems is then adjusted based on the analysis results, including:

[0022] Obtain flow separation and vortex information within the inlet and outlet water system. Based on the structural information of the inlet and outlet water system of the target pumping station corresponding to the first pump scheme, perform structural parameter calculations on the forebay, inlet pool, inlet and outlet pipelines, and outlet pool in the three-dimensional flow field calculation model of the pumping station. y The objective function is a second-order polynomial response surface model, which is used for the structural optimization of the influent and effluent water system.

[0023] The response surface model of the second-order polynomial is:

[0024] ;

[0025] in, For the objective function to be optimized, Undetermined coefficients of the constant term The coefficients of the first-order term are undetermined. and The coefficients are undetermined for the second-order terms. or To optimize variables;

[0026] objective function for:

[0027] ;

[0028] in, To meet the required head of the pumping station, Let be the axial velocity of a discrete element on the bottom surface of the horn tube. The average axial velocity of the bottom surface of the trumpet tube. The number of discrete elements on the bottom surface of the horn tube. Pi The diameter of the bottom surface of the horn tube. Design flow rate for a single pump The maximum vorticity value in the measurement area. The minimum vorticity value for the measurement area. To measure the vorticity value of a discrete element in a measurement region, This represents the number of discrete units in the corresponding measurement area.

[0029] Secondly, the present invention provides a water pump selection device for matching inlet and outlet water systems, comprising:

[0030] The setting module is used to determine multiple pump schemes that meet the engineering requirements of the pump station based on the preset flow and head information of the target pump station. The pump schemes include pump type and number of pumps.

[0031] The construction module is used to determine the structural information of the inlet and outlet water systems of the target pumping station that meet the engineering requirements of the pumping station under each pumping scheme, and to construct a three-dimensional flow field calculation model of the pumping station based on the structural information of the inlet and outlet water systems.

[0032] The simulation module is used to perform full-channel flow field simulation calculations under different flow conditions in the three-dimensional flow field calculation model of the pumping station based on the pump scheme under the minimum head, design head and maximum head conditions, and to determine the required head curve of the target pumping station under each pump type.

[0033] The processing module is used to determine the pump operating point under each pump scheme based on the required head curve and the pump performance curve of each pump type, and to determine the first pump scheme from multiple pump schemes based on the pump operating point.

[0034] In one embodiment, the device further includes an adjustment module for:

[0035] Based on the structural information of the inlet and outlet water system of the target pumping station corresponding to the first water pump scheme, the flow field analysis of the inlet and outlet water system under the design flow condition is carried out in the three-dimensional flow field calculation model of the pumping station, and the structural information of the inlet and outlet water system is adjusted according to the analysis results.

[0036] In one embodiment, the building module is specifically used for:

[0037] Based on the structural information of the water inlet and outlet system, a three-dimensional solid structure is constructed for the pump station's intake channel, forebay, inlet pool, inlet and outlet pipelines, and outlet pool. The computational domain mesh is discretized, and numerical methods and boundary conditions are set to obtain a three-dimensional flow field calculation model of the pump station for computational fluid dynamics numerical simulation.

[0038] This invention provides a pump selection and device for matching inlet and outlet water systems. Based on the structural information of the inlet and outlet water systems of the target pumping station that meets the engineering requirements of the pumping station under each pump scheme, a three-dimensional flow field calculation model of the pumping station is constructed. Under the conditions of minimum head, design head, and maximum head, the full-channel flow field simulation calculation is performed in the three-dimensional flow field calculation model of the pumping station under different flow conditions based on the pump scheme. The required head curve of the pumping station under each pump scheme is determined. Based on the required head curve and pump performance curve, the pump operating point under each pump scheme is determined. Based on the pump operating point, a pump scheme is determined from multiple pump schemes. This can minimize the mutual influence between the pump and the various flow structures of the pumping station's inlet and outlet water systems, ensuring that the entire pumping station system is in an optimal flow state, thereby achieving the goal of high pump device efficiency, low pumping station energy consumption, and safe and stable operation of the pump unit. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 This is a flowchart illustrating the method for selecting a water pump to match an inlet / outlet water system provided by the present invention.

[0041] Figure 2 This is a schematic diagram of the characteristic curves of the water pump solution provided by the present invention under different heads. Figure 1 ;

[0042] Figure 3 This is a schematic diagram of the characteristic curves of the water pump solution provided by the present invention under different heads. Figure 2 ;

[0043] Figure 4 This is a schematic diagram of the water pump selection device for matching water inlet and outlet systems provided by the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0045] Figure 1This diagram illustrates a flow chart of a method for selecting a water pump to match an inlet / outlet water system, provided by the present invention. (See attached diagram.) Figure 1 The method includes:

[0046] 11. Based on the preset flow rate and head information of the target pumping station, determine multiple pump schemes that meet the engineering requirements of the pumping station. The pump schemes include pump type and number of pumps.

[0047] 12. Determine the structural information of the inlet and outlet water systems of the target pumping station that meet the engineering requirements of the pumping station under each pumping scheme, and construct a three-dimensional flow field calculation model of the pumping station based on the structural information of the inlet and outlet water systems;

[0048] 13. Under the conditions of minimum head, design head and maximum head, based on the pump scheme, perform full-channel flow field simulation calculations under different flow conditions in the three-dimensional flow field calculation model of the pump station to determine the required head curve of the target pump station under each pump type.

[0049] 14. Determine the pump operating point for each pump scheme based on the required head curve and pump performance curves for each pump type. Based on the pump operating point, determine the first pump scheme from multiple pump schemes.

[0050] Regarding steps 11 to 14, it should be noted that in this invention, the pump station design parameters are determined based on the pump station project overview, including information such as water level, flow rate, and head under design conditions, minimum head conditions, and maximum head conditions.

[0051] Based on the preset flow rate and head information of the target pumping station, multiple pump options are determined to meet the project requirements. It should be noted that, based on the pumping station's flow rate and head information, traditional pump selection methods can be used to initially determine multiple pump options to meet the project requirements, and the number of pumps can be determined based on the pumping station's flow rate and the selected pump type.

[0052] In this invention, head refers to the energy gain per unit mass of fluid passing through a pump, which is essentially the work done by the pump on a unit mass of fluid. The energy per unit weight of fluid is called head in hydraulics, including pressure head, velocity head, and position head. Head is a crucial performance parameter of a pump.

[0053] In this invention, in addition to the water pumps in the pump house, the pump station also includes the pump station's inlet and outlet water system, which includes a diversion channel, a forebay, an inlet pool, inlet and outlet water pipelines, and an outlet pool.

[0054] Constructing a pumping station requires meeting predetermined engineering requirements. Therefore, the structural information of the inlet and outlet systems of the target pumping station, meeting these requirements under each pumping scheme, is determined. This structural information may include basic design information for the pumping station's intake channel, forebay, intake pool, inlet and outlet pipelines, and outlet pool. In this invention, based on the pumping station's design flow rate, the selected pump model and number of pumps, and the geological conditions, the water-passing structures of the pumping station's inlet and outlet systems, including the intake channel, forebay, intake pool, inlet and outlet pipelines, and outlet pool, can be designed with reference to the pumping station design standard GB50265-2022.

[0055] In this invention, it is necessary to analyze relevant information about the pumping station. Therefore, simulation calculations are required, and a three-dimensional flow field calculation model of the pumping station is constructed based on the structural information of the inlet and outlet water systems. Specifically, this may include:

[0056] Based on the structural information of the water inlet and outlet system, a three-dimensional solid structure is constructed for the pump station's intake channel, forebay, inlet pool, inlet and outlet pipelines, and outlet pool. The computational domain mesh is discretized, and numerical methods and boundary conditions are set to obtain a three-dimensional flow field calculation model of the pump station for computational fluid dynamics numerical simulation.

[0057] By constructing a three-dimensional flow field calculation model of the pump station, it is possible to realize the simulation monitoring of the pump station's operation process and obtain the information needed for pump selection for analysis.

[0058] Next is the simulation process and analysis calculation. Under the conditions of minimum head, design head and maximum head, the full flow field simulation calculation of the pump station under different flow conditions is carried out in the three-dimensional flow field calculation model of the pump station based on the pump scheme, and the required head curve of the target pump station under each pump type is determined.

[0059] Then, based on the required head curve and pump performance curves for each pump type, the pump operating point for each pump scheme is determined. Based on the pump operating point, a first pump scheme is selected from multiple schemes. This first pump scheme is the chosen pump selection scheme.

[0060] In a further step of the above method, the process of determining the required head curve for each pump type at the target pumping station is explained, specifically as follows:

[0061] The friction loss and local hydraulic loss of the pump station pipeline system are estimated using the loss calculation formula. Based on the friction loss and local hydraulic loss, the hydraulic loss curve of the target pump station under each pump type is determined. Based on the hydraulic loss curve and the preset net head, the required head curve of the target pump station under each pump type is determined.

[0062] The loss calculation formula includes:

[0063] ;

[0064] ;

[0065] ;

[0066] ;

[0067] in, Indicates hydraulic loss. , These represent hydraulic losses along the pipeline and local hydraulic losses within the pipeline, respectively. Indicates the density of water; g Represents gravitational acceleration; , and Representing cross-sections i The average static pressure, average velocity, and elevation of the center point of the cross section; This indicates the resistance coefficient of a local accessory in the pipeline; This indicates that a head is required; The net head represents the difference between the water level in the inlet pool and the water level in the outlet pool; 0 represents the cross-section of the outlet channel of the inlet system. m Indicates the inlet cross-section of the outlet pool; i This refers to a section between the outlet section of the diversion channel and the inlet section of the outlet pool; k This indicates the section where a local accessory of the pipeline is located between the outlet section of the diversion channel and the inlet section of the outlet pool.

[0068] In a further step of the above method, the process of constructing a three-dimensional flow field calculation model of the pumping station based on the structural information of the inlet and outlet water system is explained, specifically as follows:

[0069] Based on the structural information of the water inlet and outlet system, a three-dimensional solid structure is constructed for the pump station's intake channel, forebay, inlet pool, inlet and outlet pipelines, and outlet pool. The computational domain mesh is discretized, and numerical methods and boundary conditions are set to obtain a three-dimensional flow field calculation model of the pump station for computational fluid dynamics numerical simulation.

[0070] It should be noted that, based on the structural information of the water inlet and outlet system, a three-dimensional entity can be constructed first, comprising the pump station's intake channel, forebay, inlet pool, inlet and outlet pipelines, and outlet pool. Then, for subsequent simulation calculations, some conditions need to be added to the three-dimensional entity to facilitate the simulation process. These conditions include the discretization of the computational domain mesh, the numerical method, and the setting of boundary conditions. By adding these conditions, the required scenario and calculations for the simulation process can be simulated. In this invention, the three-dimensional entity construction combined with the setting of conditions enables the simulation of fluid dynamics, thereby obtaining a three-dimensional flow field calculation model for a pump station capable of numerical simulation of fluid dynamics.

[0071] In a further step of the above method, in this invention, although a reasonable pump scheme is determined from multiple pump schemes, after determining the reasonable pump scheme, it is still necessary to optimize and adjust the structural information of the inlet and outlet water system. Therefore, based on the structural information of the inlet and outlet water system of the target pumping station corresponding to the first pump scheme, flow field analysis is performed in the three-dimensional flow field calculation model of the pumping station under the design flow rate condition. The structural information of the inlet and outlet water system is adjusted according to the analysis results, specifically including:

[0072] Obtain flow separation and vortex information within the inlet and outlet water system. Based on the structural information of the inlet and outlet water system of the target pumping station corresponding to the first pump scheme, perform structural parameter calculations on the forebay, inlet pool, inlet and outlet pipelines, and outlet pool in the three-dimensional flow field calculation model of the pumping station. y The objective function is a second-order polynomial response surface model, which is used for the structural optimization of the influent and effluent water system.

[0073] The response surface model of the second-order polynomial is:

[0074] ;

[0075] in, For the objective function to be optimized, Undetermined coefficients of the constant term The coefficients of the first-order term are undetermined. and The coefficients are undetermined for the second-order terms. or To optimize variables;

[0076] objective function for:

[0077] ;

[0078] in, To meet the required head of the pumping station, Let be the axial velocity of a discrete element on the bottom surface of the horn tube. The average axial velocity of the bottom surface of the trumpet tube. The number of discrete elements on the bottom surface of the horn tube. Pi The diameter of the bottom surface of the horn tube. Design flow rate for a single pump The maximum vorticity value in the measurement area. The minimum vorticity value for the measurement area. To measure the vorticity value of a discrete element in a measurement region, This represents the number of discrete units in the corresponding measurement area.

[0079] When optimizing the structure of the inlet and outlet water system, the optimization constraints must first be clearly defined, including the type and main parameters of the forebay and inlet / outlet pools, the type and main parameters of the inlet / outlet flow channels or pipes (including the inlet bellows), and the pump structure and installation elevation. Then, based on the optimization object and constraints, orthogonal experiments and other methods are used to determine the optimal calculation combination for each optimization variable. Finally, the CFD numerical results of each calculation scheme are analyzed, and its objective function is calculated. y The values ​​of the variables are determined using the least squares method to obtain the corresponding optimized response surface model and the optimal values ​​of each variable. In other words, adjusting certain parameters or combining parameters in the structural information of the influent and effluent water system will cause changes in the corresponding parameters during the simulation, i.e., changes in some variables in the objective function and response surface model. These changes in variables, in turn, affect the objective function. y Changes occur, at which point an assessment can be made. y Whether the value meets the required conditions (such as minimum, maximum, etc.) is determined. If the conditions are met, the adjusted parameters in the result information can be used as the optimized parameter values.

[0080] In this invention, the objective function y The influence of various parameters on flow field pressure, velocity, and vortex intensity was also considered. The flow field within the pump station under optimal matching has low hydraulic loss, high uniformity of flow velocity distribution, and no or very weak vortices, thus avoiding energy waste and safety hazards such as pump cavitation or vibration caused by the inlet and outlet flow fields.

[0081] The solution will be explained with specific examples below:

[0082] One electric irrigation district comprises five cascade pumping stations, with the fourth-stage pumping station having a design flow rate of 6.4 m³ / s. 3 / s, the highest operating water level, design water level and lowest operating water level of the inlet pool are 56.2m, 55.7m and 55.2m respectively, and the highest operating water level, design water level and lowest operating water level of the outlet pool are 69.2m, 68.8m and 68.2m respectively.

[0083] Based on the project overview of the fourth-level pumping station, the flow rate and head of the pumping station are determined. The design flow rate of the pumping station is 6.4 m³ / h. 3 / s, with a maximum net head, a design net head, and a minimum net head of 14m, 13.1m, and 12m, respectively.

[0084] Based on the flow rate and head characteristics of the pumping station, centrifugal pumps and mixed-flow pumps are suitable for selection. Considering the requirements of irrigation and economic operation, and based on the planning parameters, three XS800-800 centrifugal pumps (pump selection scheme 1) and three 800HW-16 mixed-flow pumps (pump selection scheme 2) are initially selected.

[0085] Based on the pump station's design flow rate, the selected pump model and number of pumps, and the geological conditions, the water passage structures of the pump station's inlet and outlet systems are designed in accordance with the pump station design standards, including the diversion channel, forebay, inlet pool, inlet and outlet pipelines, and outlet pool.

[0086] Based on the initially determined structure of the pump station's inlet and outlet structures, a three-dimensional solid model of the pump station's intake channel, forebay, inlet pool, inlet and outlet pipelines, and outlet pool was constructed. The computational domain mesh was discretized, and numerical methods and boundary conditions were set to build a three-dimensional flow field calculation model of the pump station for CFD numerical simulation.

[0087] Based on the initially selected pump model, under the conditions of minimum head, design head, and maximum head, the constructed CFD calculation model was used to analyze the pump station under different flow conditions (0.6). Q 0.8 Q 1.0 Q 1.2 Q 1.4 Q , Q A three-dimensional flow field simulation calculation of the entire flow channel was performed under the design flow rate of a single pump to obtain the required head curve of the pumping station for different pump selection schemes.

[0088] The required head curves for pump stations under different head conditions for each selected option are shown in the attached figure. Figure 2-3 As shown.

[0089] From the appendix Figure 2 It can be seen that the operating point of the water pump under the design head of water pump selection scheme 1 is: single pump flow rate 2.23 m³ / h 3 The required head is 14.52m, the pump efficiency is 89.2%, and the total flow rate of the pumping station is 6.69 m³ / s. 3 / s.

[0090] From the appendix Figure 3 It can be seen that the operating point of the water pump under the design head of water pump selection scheme 2 is: single pump flow rate 2.22 m³ / s. 3 The required head is 14.62m, the pump efficiency is 82.9%, and the total flow rate of the pumping station is 6.66 m³ / s. 3 / s.

[0091] At the design head, both pump selection schemes 1 and 2 can meet the irrigation needs of the pumping station. However, it is clear that the pump in scheme 1 operates within its high-efficiency range, while the efficiency of the pump in scheme 2 is 6.3% lower than that in scheme 1, yet its hydraulic loss is 0.1m higher. Considering both hydraulic loss and pump efficiency, the pump model in scheme 1 should be selected.

[0092] The pump selection method for pumping stations provided by this invention constructs a three-dimensional flow field calculation model of the pumping station based on the structural information of the inlet and outlet water systems of the target pumping station that meet the engineering requirements of the pumping station under each pump scheme. Under the conditions of minimum head, design head, and maximum head, the method performs full-channel flow field simulation calculations under different flow conditions in the three-dimensional flow field calculation model of the pumping station based on the pump scheme, determines the required head curve of the pumping station under each pump scheme, and determines the pump operating point under each pump scheme based on the required head curve and the pump performance curve. Based on the pump operating point, a pump scheme is determined from multiple pump schemes. This method can minimize the mutual influence between the pump and the various flow structures in the pumping station's inlet and outlet water systems, ensuring that the entire pumping station system is in the optimal flow state, thereby achieving the goal of high pump efficiency, low pumping station energy consumption, and safe and stable operation of the pump unit.

[0093] The pump station pump selection device provided by the present invention is described below. The pump station pump selection device described below and the pump station pump selection method described above can be referred to in correspondence.

[0094] Figure 4 A schematic diagram of a pump station pump selection device provided by the present invention is shown below. Figure 4 The device includes a setting module 41, a construction module 42, a simulation module 43, and a processing module 44, wherein:

[0095] Setting module 41 is used to determine multiple pump schemes that meet the engineering requirements of the pump station based on the preset flow and head information of the target pump station. The pump schemes include pump type and number of pumps.

[0096] Module 42 is used to determine the structural information of the inlet and outlet water systems of the target pumping station that meets the engineering requirements of the pumping station under each pumping scheme, and to construct a three-dimensional flow field calculation model of the pumping station based on the structural information of the inlet and outlet water systems.

[0097] Simulation module 43 is used to perform full-channel flow field simulation calculations under different flow conditions in the three-dimensional flow field calculation model of the pump station based on the pump scheme under the conditions of minimum head, design head and maximum head, and to determine the required head curve of the target pump station under each pump type.

[0098] The processing module 44 is used to determine the pump operating point under each pump scheme according to the required head curve and the pump performance curve of each pump type, and to determine the first pump scheme from multiple pump schemes based on the pump operating point.

[0099] In a further embodiment of the above-described device, the device further includes an adjustment module for:

[0100] Based on the structural information of the inlet and outlet water system of the target pumping station corresponding to the first water pump scheme, the flow field analysis of the inlet and outlet water system under the design flow condition is carried out in the three-dimensional flow field calculation model of the pumping station, and the structural information of the inlet and outlet water system is adjusted according to the analysis results.

[0101] In a further embodiment of the above apparatus, the construction module is specifically used for:

[0102] Based on the structural information of the water inlet and outlet system, a three-dimensional solid structure is constructed for the pump station's intake channel, forebay, inlet pool, inlet and outlet pipelines, and outlet pool. The computational domain mesh is discretized, and numerical methods and boundary conditions are set to obtain a three-dimensional flow field calculation model of the pump station for computational fluid dynamics numerical simulation.

[0103] Since the device described in this embodiment of the invention is based on the same principle as the method described in the above embodiments, more detailed explanations will not be repeated here.

[0104] The pump selection device provided by this invention constructs a three-dimensional flow field calculation model of the pump station based on the structural information of the inlet and outlet water systems of the target pump station that meet the engineering requirements of the pump station under each pump scheme. Under the conditions of minimum head, design head, and maximum head, the device performs full-channel flow field simulation calculations under different flow conditions in the three-dimensional flow field calculation model of the pump station based on the pump scheme, determines the required head curve of the pump station under each pump type, and determines the pump operating point under each pump scheme based on the required head curve and pump performance curve. Based on the pump operating point, a pump scheme is determined from multiple pump schemes. This can eliminate the mutual influence between the pump and the various flow structures of the pump station's inlet and outlet water systems to the greatest extent, ensuring that the entire pump station system is in the optimal flow state, thereby achieving the goal of high pump device efficiency, low pump station energy consumption, and safe and stable operation of the pump unit.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for selecting a water pump to match an inlet and outlet water system, characterized in that, include: Based on the preset flow rate and head information of the target pumping station, multiple pump schemes that meet the engineering requirements of the pumping station are determined. The pump schemes include pump type and number of pumps. Determine the structural information of the inlet and outlet water systems of the target pumping station that meet the engineering requirements of the pumping station under each pump scheme, and construct a three-dimensional flow field calculation model of the pumping station based on the structural information of the inlet and outlet water systems; Under the conditions of minimum head, design head and maximum head, based on the pump scheme, the full flow field simulation calculation of the pump station under different flow conditions is carried out in the three-dimensional flow field calculation model of the pump station to determine the required head curve of the target pump station under each pump type. Based on the required head curve and the pump performance curve of each pump type, determine the pump operating point under each pump scheme, and based on the pump operating point, determine the first pump scheme from multiple pump schemes. The method further includes: Based on the structural information of the inlet and outlet water system of the target pumping station corresponding to the first water pump scheme, the flow field analysis of the inlet and outlet water system under the design flow condition is carried out in the three-dimensional flow field calculation model of the pumping station, and the structural information of the inlet and outlet water system is adjusted according to the analysis results. Determining the required head curve for the target pump station under each pump type includes: The friction loss and local hydraulic loss of the pump station pipeline system are estimated using the loss calculation formula. Based on the friction loss and local hydraulic loss, the hydraulic loss curve of the target pump station under each pump type is determined. Based on the hydraulic loss curve and the preset net head, the required head curve of the target pump station under each pump type is determined. The loss calculation formula includes: ； ； ； ； in, Indicates hydraulic loss. , These represent hydraulic losses along the pipeline and local hydraulic losses within the pipeline, respectively. Indicates the density of water; g Represents gravitational acceleration; , and Representing cross-sections i The average static pressure, average velocity, and elevation of the center point of the cross section; This indicates the resistance coefficient of a local accessory in a pipeline; This indicates that a head is required; The net head represents the difference between the water levels in the inlet and outlet pools; 0 indicates the cross-section of the inlet system's intake channel outlet. m This indicates the inlet cross-section of the water outlet pool. i This refers to a section between the outlet section of the diversion channel and the inlet section of the outlet pool; k This indicates the section where a local accessory of the pipeline is located between the outlet section of the diversion channel and the inlet section of the outlet pool; Based on the structural information of the inlet and outlet water systems of the target pumping station corresponding to the first pumping scheme, flow field analysis is performed in the three-dimensional flow field calculation model of the pumping station under the design flow conditions. The structural information of the inlet and outlet water systems is adjusted according to the analysis results, including: Obtain flow separation and vortex information within the inlet and outlet water system. Based on the structural information of the inlet and outlet water system of the target pumping station corresponding to the first pump scheme, perform structural parameter calculations on the forebay, inlet pool, inlet and outlet pipelines, and outlet pool in the three-dimensional flow field calculation model of the pumping station. y The objective function is a second-order polynomial response surface model, which is used for the structural optimization of the influent and effluent water system. The response surface model of the second-order polynomial is: ； in, For the objective function to be optimized, Undetermined coefficients of the constant term The coefficients of the first-order term are undetermined. and The coefficients are undetermined for the second-order terms. or To optimize variables; objective function for: ； in, To meet the required head of the pumping station, Let be the axial velocity of a discrete element on the bottom surface of the horn tube. The average axial velocity of the bottom surface of the trumpet tube. The number of discrete elements on the bottom surface of the horn tube. Pi The diameter of the bottom surface of the horn tube. Design flow rate for a single pump The maximum vorticity value in the measurement area. The minimum vorticity value for the measurement area. To measure the vorticity value of a discrete element in a measurement region, This represents the number of discrete units in the corresponding measurement area.

2. The method for selecting a water pump to match an inlet / outlet water system according to claim 1, characterized in that, The construction of a three-dimensional flow field calculation model for the pumping station based on the structural information of the inlet and outlet water system includes: Based on the structural information of the water inlet and outlet system, a three-dimensional solid structure is constructed for the pump station's intake channel, forebay, inlet pool, inlet and outlet pipelines, and outlet pool. The computational domain mesh is discretized, and numerical methods and boundary conditions are set to obtain a three-dimensional flow field calculation model of the pump station for computational fluid dynamics numerical simulation.

3. A pump selection device for a matching inlet and outlet water system based on the pump selection method for matching inlet and outlet water systems as described in claim 1 or 2, characterized in that, include: The setting module is used to determine multiple pump schemes that meet the engineering requirements of the pump station based on the preset flow and head information of the target pump station. The pump schemes include pump type and number of pumps. The construction module is used to determine the structural information of the inlet and outlet water systems of the target pumping station that meet the engineering requirements of the pumping station under each pumping scheme, and to construct a three-dimensional flow field calculation model of the pumping station based on the structural information of the inlet and outlet water systems. The simulation module is used to perform full-channel flow field simulation calculations under different flow conditions in the three-dimensional flow field calculation model of the pumping station based on the pump scheme under the conditions of minimum head, design head and maximum head, and to determine the required head curve of the target pumping station under each pump type. The processing module is used to determine the pump operating point under each pump scheme based on the required head curve and the pump performance curve of each pump type, and to determine the first pump scheme from multiple pump schemes based on the pump operating point.

4. The water pump selection device for matching inlet and outlet water systems according to claim 3, characterized in that, The device further includes an adjustment module for: Based on the structural information of the inlet and outlet water system of the target pumping station corresponding to the first water pump scheme, the flow field analysis of the inlet and outlet water system under the design flow condition is carried out in the three-dimensional flow field calculation model of the pumping station, and the structural information of the inlet and outlet water system is adjusted according to the analysis results.

5. The water pump selection device for matching inlet and outlet water systems according to claim 3 or 4, characterized in that, The building module is specifically used for: Based on the structural information of the water inlet and outlet system, a three-dimensional solid structure is constructed for the pump station's intake channel, forebay, inlet pool, inlet and outlet pipelines, and outlet pool. The computational domain mesh is discretized, and numerical methods and boundary conditions are set to obtain a three-dimensional flow field calculation model of the pump station for computational fluid dynamics numerical simulation.

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