Method, device and medium for determining flow interference in multi-nozzle impulse turbine

Abstract

The present invention relates to the field of water turbine technology, and in particular to a method, device and medium for determining flow interference in a multi-nozzle impulse turbine. The method for determining flow interference in a multi-nozzle impulse turbine comprises: step one, obtaining a first time duration required for any water bucket from inflow to complete outflow on the front face of the water bucket, and a time course curve of the torque of the front and back faces of the water bucket under the action of the jet; step two, obtaining a second time duration required for the water bucket to rotate through the angle between two adjacent nozzles; step three, analyzing and determining whether flow interference between two jets exists inside the water bucket by comparing the first time duration with the second time duration; step four, determining whether flow interference will occur in the multi-nozzle impulse turbine, and the type of flow interference, by comparing and analyzing the time course curve of the torque on the back face of the water bucket. The present invention can assess the risk of flow interference in the impulse turbine, thereby improving the hydraulic efficiency and operational stability of the impulse turbine.

Description

Technical Field

[0001] The present invention relates to the technical field of water turbines, and in particular to a method, equipment and medium for determining flow interference in a multi-nozzle impulse turbine. Background Art

[0002] The runner in the impulse turbine is the core component of the unit's energy conversion. Its unique various flow interference phenomena will lead to hydraulic losses and reduced operational stability of the unit. Flow interference inside the runner bucket and several other types of flow interference will lead to a significant drop in hydraulic efficiency. A comprehensive design is required during the design phase to reduce or even avoid such phenomena. In the prior art, during the design phase of the hydraulic model of the impulse turbine, there is no method that can predict: only the rotational motion of the runner bucket under the action of a single nozzle jet is calculated and simulated, and the analysis method for the flow interference between the two jets on the bucket surface under different operating conditions, as well as the analysis method for the two types of flow interference on the back of the bucket, resulting in a low hydraulic efficiency of the designed impulse turbine. Summary of the Invention

[0003] The present invention provides a method, device and medium for determining flow interference in a multi-nozzle impulse turbine, so as to solve the defect in the background technology that there is no method for predicting the flow process in the runner bucket of a multi-nozzle impulse turbine by only simulating the action of a single nozzle jet, the flow interference between two jets inside the bucket, and the determination method of two types of flow interference on the back of the bucket, which leads to low hydraulic efficiency of the designed impulse turbine.

[0004] The present invention provides a method for determining flow interference in a multi-nozzle impulse turbine, comprising:

[0005] Obtain the time history curves of the torque on the front and back of the bucket under the action of the jet, as well as the first time required for a single nozzle jet in a multi-nozzle Pelton turbine to flow through any bucket from the time it enters to the time it completely flows out of the front of the bucket;

[0006] Obtaining a second time duration required for the water bucket to rotate through the angle formed between two adjacent nozzles;

[0007] By comparing the first time duration with the second time duration, analyzing and determining whether there is flow interference between the two jets inside the water bucket;

[0008] According to the time course curve of the torque on the back of the bucket, if the bucket torque is negative at the beginning of the jet flowing into the bucket, it is determined that there is flow interference between the jet and the bucket; if the bucket torque is negative at the stage of the jet flowing out of the bucket, it is determined that there is flow interference between the water film outflow and the back of the bucket.

[0009] According to the method for determining flow interference in a multi-nozzle impulse turbine provided by the present invention, when the first time length is less than the second time length, it is determined that there is no flow interference between the two jets in the bucket;

[0010] When the first time length is greater than or equal to the second time length, it is determined that flow interference between two jets exists inside the bucket.

[0011] According to the method for determining flow interference in a multi-nozzle impulse turbine provided by the present invention, the method further includes: obtaining a first time required for a single nozzle jet in the multi-nozzle impulse turbine to flow through any bucket from the time it flows into the bucket to the time it completely flows out of the front face of the bucket;

[0012] The first time required for a single jet to form a water film and flow onto the front of the water bucket is determined by the time history curve of the front torque of the water bucket.

[0013] The method for determining flow interference in a multi-nozzle impulse turbine according to the present invention further includes, before the step of obtaining a time history curve of the torque at the front and back sides of the bucket under the action of the jet:

[0014] When only a single nozzle is arranged in a multi-nozzle unit, the flow numerical calculation of the runner bucket flow channel is carried out to determine the time history curve of the torque on the front and back of a single bucket under the action of the jet.

[0015] According to the method for determining flow interference in a multi-nozzle impulse turbine provided by the present invention, when only a single nozzle is arranged in the multi-nozzle unit, before the step of performing flow numerical calculation on the runner bucket flow channel to determine the time history curve of the torque on the front and back sides of the single bucket under the action of the jet, the method further includes:

[0016] A three-dimensional model of the runner is obtained, and the front and back sides of the bucket are determined according to the three-dimensional model of the runner.

[0017] According to the method for determining flow interference in a multi-nozzle impulse turbine provided by the present invention, the runner rotation period is obtained, and based on the number of nozzles, the second time required for the bucket to rotate through the angle between two adjacent nozzles is determined.

[0018] According to the method for determining flow interference in a multi-nozzle impulse turbine provided by the present invention, in the step of obtaining the runner rotation period and determining the second time required for the bucket to rotate through the angle between two adjacent nozzles based on the number of nozzles, the method specifically includes: using the formula: ΔT=60 / n / Z N , calculate the second time required for the bucket to rotate through the angle between two adjacent nozzles; where: ΔT is the second time required for the bucket to rotate through the angle between two adjacent nozzles, n is the speed of the bucket wheel, Z Nis the number of nozzles.

[0019] According to the method for determining flow interference of a multi-nozzle impulse turbine provided by the present invention, Z N The value of is greater than or equal to 3.

[0020] The present invention also provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the method of determining flow interference of a multi-nozzle impulse turbine according to the present invention when executing the program.

[0021] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method of determining flow interference of a multi-nozzle impulse turbine according to the present invention is implemented.

[0022] The present invention provides a method, device, and medium for determining flow interference in a multi-nozzle impulse turbine. The method comprises the following steps: Step 1: obtaining a first time duration required for a single nozzle jet in the multi-nozzle impulse turbine to flow through any bucket from the time it flows into the bucket to the time it flows out of the front face of the bucket, as well as a time-dependent curve of the torque on the front and back faces of the bucket under the action of the jet; Step 2: obtaining a second time duration required for the bucket to rotate through the angle formed between two adjacent nozzles; Step 3: analyzing and determining whether flow interference exists between the two jets inside the bucket by comparing the first time duration with the second time duration; Step 4: determining, based on the time-dependent curve of the torque on the back face of the bucket, that flow interference exists between the jet and the bucket if the bucket torque is negative at the beginning of the jet flowing into the bucket; and determining that flow interference exists between the water film outflow and the back face of the bucket if the bucket torque is negative at the stage of the jet flowing out of the bucket.

[0023] The present invention provides a method for determining flow interference in a multi-nozzle impulse turbine. The method can evaluate the risk of flow interference in the impulse turbine by comparing the first time required for a single nozzle jet to flow through any bucket from the inflow to the complete outflow on the front of the bucket with the second time required for the bucket to rotate through the angle formed between two adjacent nozzles. The present invention compares and analyzes at which stage the torque on the back of the bucket becomes negative, which will lead to the risk of two other flow interferences. During the runner design stage of the impulse turbine, the first time is ensured to be less than the second time to avoid the risk of jet flow interference in the bucket. At the same time, the time history curve of the torque on the back of the bucket is ensured to avoid negative values ​​as much as possible to avoid the risk of flow interference between the jet or water film outflow and the back of the bucket. This avoids the problems of hydraulic loss and reduced operational stability of the unit caused by the torque, thereby improving the hydraulic efficiency and operational stability of the impulse turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is one of the flow charts of the method for determining flow interference of a multi-nozzle impulse turbine provided by the present invention.

[0026] Figure 2 This is the second flow chart of the method for determining flow interference of a multi-nozzle impulse turbine provided by the present invention.

[0027] Figure 3 It is a front structural schematic diagram of the water bucket provided by the present invention.

[0028] Figure 4 It is a schematic diagram of the back structure of the water bucket provided by the present invention.

[0029] Figure 5 It is a curve diagram showing the torque of the bucket provided by the present invention over time.

[0030] Figure 6 It is a schematic diagram of the interference between two jets on the bucket surface of the multi-nozzle impulse turbine provided by the present invention.

[0031] Figure 7 It is a schematic diagram of the interference between the outflow and the back of the bucket of the multi-nozzle impulse turbine provided by the present invention.

[0032] Figure 8 It is a schematic diagram of the interference between the jet and the back of the bucket in the multi-nozzle impulse turbine provided by the present invention.

[0033] Figure 9 It is a structural schematic diagram of the electronic device provided by the present invention.

[0034] Reference numerals:

[0035] 810 , processor; 820 , communication interface; 830 , memory; 840 , communication bus. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0037] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0038] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0039] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0041] The following combination Figures 1-9 The present invention describes the method for determining flow interference in a multi-nozzle impulse turbine. Figure 1 As shown, the method for determining flow interference in a multi-nozzle impulse turbine specifically includes the following determination steps:

[0042] Step 1: Obtain the time history curves of the torque on the front and back of the bucket under the action of the jet, as well as the first time required for a single nozzle jet in a multi-nozzle impulse turbine to flow through any bucket from the time it enters to the time it completely flows out of the front of the bucket;

[0043] Step 2: Obtain a second time duration required for the water bucket to rotate through the angle formed between two adjacent nozzles;

[0044] Step 3: By comparing the first duration with the second duration, analyzing and determining whether there is flow interference between the two jets inside the water bucket;

[0045] Step 4: Based on the time-dependent torque curve of the back of the bucket, if the bucket torque is negative at the beginning of the jet flowing into the bucket, it is determined that there is flow interference between the jet and the bucket; if the bucket torque is negative at the stage of the jet flowing out of the bucket, it is determined that there is flow interference between the water film outflow and the back of the bucket.

[0046] The positive and negative values ​​of the above bucket torque indicate that a positive bucket torque is defined as the jet pushing the bucket to do positive work; conversely, a negative value is defined as hindering the runner bucket from doing work.

[0047] This method analyzes and determines whether flow interference occurs within the multi-nozzle Pelton turbine, as well as the type of flow interference. Specifically, the method measures the time it takes for a single nozzle jet to flow through any bucket from the moment it enters the bucket to the moment it completely exits the bucket, and the time it takes for the bucket to rotate across the angle between two adjacent nozzles. By comparing the first and second time periods, the method determines whether flow interference occurs within the multi-nozzle Pelton turbine.

[0048] The analysis and judgment process is as follows: If the first time length is less than the second time length, it indicates that the movement time of a single jet to form a water film and flow into the front of the bucket is shorter than the time required for the bucket to rotate from the inflow position of the jet to the inflow position of the next jet, and there is no risk of interference between the two jets inside the bucket. If the first time length is greater than or equal to the second time length, it indicates that the flow of the previous jet has not been completely discharged from the front of the bucket, and the next jet flows into the front of the bucket. The movement periods of the two adjacent jets on the same bucket front intersect, and there is a risk of interference between the two jets inside the bucket. Therefore, during the runner design stage of the impulse turbine, it is ensured that the first time length is less than the second time length to avoid the risk of jet flow interference in the bucket, thereby avoiding the problem of hydraulic loss and reduced operating stability of the unit caused by it. By carrying out a complete design during the runner design stage of the impulse turbine, such flow interference problems can be reduced or even avoided.

[0049] The present invention provides a method for determining flow interference in a multi-nozzle impulse turbine, which includes the following steps: step 1, obtaining a first time required for a single nozzle jet in the multi-nozzle impulse turbine to flow through any water bucket from the time it flows into the water bucket to the time it flows out of the front of the water bucket, and a time history curve of the torque under the action of the jet on the front and back of the water bucket; step 2, obtaining a second time required for the water bucket to rotate through the angle between two adjacent nozzles; step 3, analyzing and judging whether there is flow interference between the two jets inside the water bucket by comparing the first time and the second time; step 4, based on the time history curve of the torque on the back of the water bucket, at the beginning of the jet flowing into the water bucket, if the water bucket torque is a negative value, it is determined that there is flow interference between the jet and the water bucket; at the stage when the jet flows out of the water bucket, if the water bucket torque is a negative value, it is determined that there is flow interference between the water film outflow and the back of the water bucket.

[0050] The present invention provides a method for determining flow interference in a multi-nozzle impulse turbine. The method can evaluate the risk of flow interference in the impulse turbine by comparing the first time required for a single nozzle jet to flow through any bucket from the inflow to the complete outflow on the front of the bucket with the second time required for the bucket to rotate through the angle formed between two adjacent nozzles. The present invention compares and analyzes at which stage the torque on the back of the bucket becomes negative, which will lead to the risk of two other flow interferences. During the runner design stage of the impulse turbine, the first time is ensured to be less than the second time to avoid the risk of jet flow interference in the bucket. At the same time, the time history curve of the torque on the back of the bucket is ensured to avoid negative values ​​as much as possible to avoid the risk of flow interference between the jet or water film outflow and the back of the bucket. This avoids the problems of hydraulic loss and reduced operational stability of the unit caused by the torque, thereby improving the hydraulic efficiency and operational stability of the impulse turbine.

[0051] In one embodiment of the present invention, before the step of obtaining the first time required for a single nozzle jet in a multi-nozzle impulse turbine to flow through any bucket from the time it enters to the time it completely flows out of the front face of the bucket, that is, before step 1, the method further includes: S3, determining the first time required for the single jet to form a water film and flow into the front face of the bucket through a curve of the front torque of the bucket over time. Figure 3 As shown in FIG, it is a schematic diagram of the front structure of the water bucket; Figure 4 As shown in FIG, it is a schematic diagram of the back structure of the bucket. The bucket image or three-dimensional model can be identified and processed by an image processing recognition and processing system to determine the front of the bucket. In this embodiment, the bucket is divided into the front and back sides by identifying the image or three-dimensional model of the water head, and the time history curve of the front and back torque of the bucket is obtained. Figure 5 As shown, the red curve is the front torsion curve of the water bucket, the blue curve is the back torsion curve of the water bucket, and the black curve is the torsion curve of the entire water bucket.

[0052] In one embodiment of the present invention, the first time required for a single jet to form a water film and flow into the front of the water bucket is determined by the front torsion curve of the water bucket, such as Figure 5 As shown, the horizontal axis is the time step, which means the time it takes for the bucket to rotate around the central axis of the runner after receiving the jet inflow; the vertical axis is C T , which represents the bucket's torque. The torque history curve is determined based on the torque readings on the front and back of the bucket after the flow calculation. Based on the correspondence between the horizontal and vertical coordinates, the physical time corresponding to the horizontal coordinate on the front of the bucket at that vertical coordinate is read. This physical time duration is the required first duration. Furthermore, time 0 is defined as the moment the bucket tip contacts the jet surface; the next moment, the jet enters the bucket.

[0053] In one embodiment of the present invention, before obtaining the time history curves of the torque on the front and back sides of the bucket under the action of the jet, that is, before step S3, the following further steps are included: S2: When only a single nozzle is deployed in the multi-nozzle unit, numerical flow calculations are performed on the runner bucket flow path to determine the time history curves of the torque on the front and back sides of the individual bucket under the action of the jet. Specifically, numerical calculations of the unsteady multiphase flow in the runner bucket are performed using CFD methods and ANSYS CFX software to obtain the time history curves of the torque on the front and back sides of the bucket under the impact of a single nozzle. In this embodiment, the time history curves of the torque on the front and back sides of the bucket are obtained through numerical flow calculations within the runner bucket, thereby determining the first time required for a single nozzle jet to flow through any bucket from the time it enters to the time it completely exits the front side of that bucket.

[0054] In one embodiment of the present invention, when only a single nozzle is arranged in a multi-nozzle unit, before the step of performing numerical flow calculations on the runner bucket flow path to determine the time history curves of the front and back sides of a single bucket under the action of the jet, that is, before step S2, the method further includes: S1. Obtaining a three-dimensional model of the runner and determining the front and back sides of the buckets based on the three-dimensional model. Specifically, the runner can be scanned using an image acquisition device to form a three-dimensional model, or a three-dimensional model of a specified runner model can be directly imported into an image processing and recognition system. Through processing and recognition of the three-dimensional model, each bucket is divided into a front side and a back side; the three-dimensional model of the front side of the bucket is obtained and used in step S2 to determine the time history curves of the front and back sides of the buckets using numerical flow calculations.

[0055] In one embodiment of the present invention, the runner rotation period is obtained, and based on the number of nozzles, the second time required for the bucket to rotate through the angle formed between two adjacent nozzles is determined. The method for determining flow interference in a multi-nozzle impulse turbine in an embodiment of the present invention is applicable to a method for determining flow interference in a multi-nozzle impulse turbine, where the number of nozzles is greater than or equal to 3. This embodiment preferably uses a 6-nozzle impulse turbine to determine the flow interference risk of a 6-nozzle impulse turbine. The runner rotation period and the number of nozzles are used to determine the time required for the bucket to rotate through the angle formed between two adjacent nozzles, that is, the second time.

[0056] In one embodiment of the present invention, in the step of obtaining the rotation period of the runner and determining the second time required for the bucket to rotate through the angle between two adjacent nozzles according to the number of nozzles, that is, step S4 specifically includes: using the formula: ΔT=60 / n / Z N , calculate the second time required for the bucket to rotate through the angle between two adjacent nozzles; where: ΔT is the second time required for the bucket to rotate through the angle between two adjacent nozzles, n is the runner bucket speed, then the runner rotation period T is 60 / n ; Z N is the number of nozzles.

[0057] In one embodiment of the present invention, Z N The value of is greater than or equal to 3.

[0058] Figure 1 This is one of the flow charts of the method for judging flow interference of a multi-nozzle impulse turbine provided by the present invention, such as Figure 1 As shown, the method includes the following:

[0059] Step 1: Obtain the time history curves of the torque on the front and back of the bucket under the action of the jet, as well as the first time required for a single nozzle jet in a multi-nozzle impulse turbine to flow through any bucket from the time it enters to the time it completely flows out of the front of the bucket;

[0060] Step 2: Obtain a second time duration required for the water bucket to rotate through the angle formed between two adjacent nozzles;

[0061] Step 3: By comparing the first duration with the second duration, analyzing and determining whether there is flow interference between the two jets inside the water bucket;

[0062] Step 4: Based on the time-dependent torque curve of the back of the bucket, if the bucket torque is negative at the beginning of the jet flowing into the bucket, it is determined that there is flow interference between the jet and the bucket; if the bucket torque is negative at the stage of the jet flowing out of the bucket, it is determined that there is flow interference between the water film outflow and the back of the bucket.

[0063] Figure 2 This is one of the flow charts of the method for determining flow interference in a multi-nozzle impulse turbine provided by the present invention. Figure 2 As shown, the method includes the following:

[0064] S1. Obtain a three-dimensional model of the runner, and determine the front and back of the bucket according to the three-dimensional model of the runner;

[0065] S2. When only a single nozzle is arranged in a multi-nozzle unit, numerical calculation of the flow in the runner bucket flow channel is performed to determine the time history curve of the torque on the front and back of a single bucket under the action of the jet;

[0066] S3. Obtaining time-dependent torque curves of the front and back sides of the bucket under the action of the jet, and the first time required for a single nozzle jet in a multi-nozzle Pelton turbine to flow through any bucket from the time it enters to the time it completely flows out of the front side of the bucket;

[0067] S4. Obtain the wheel rotation period and the number of nozzles using the formula: ΔT=60 / n / Z N , calculate the second time required for the bucket to rotate through the angle between two adjacent nozzles; where ΔT is the second time required for the bucket to rotate through the angle between two adjacent nozzles, n is the speed of the runner bucket, then the runner rotation period T is 60 / n ; Z N is the number of nozzles;

[0068] S5. Compare the first and second durations to determine whether there is interference between the two jet flows inside the bucket: If the first duration is less than the second duration, it indicates that the movement time of a single jet to form a water film flowing into the front of the bucket is shorter than the time required for the bucket to rotate from the inflow position of the jet to the inflow position of the next jet, and there is no risk of interference between the two jet flows inside the bucket. If the first duration is greater than or equal to the second duration, it indicates that the flow of the previous jet has not been completely discharged from the front of the bucket, and the next jet has flowed into the front of the bucket. The movement periods of the two adjacent jets on the same bucket front intersect, and there is a risk of interference between the two jet flows inside the bucket. Compare and analyze the time course curve of the torque on the back of the bucket. If it is negative at the beginning of the jet flowing into the bucket, it indicates that flow interference between the jet and the bucket will occur; if it is negative at the stage when the jet flows out of the bucket, it indicates that flow interference between the water film outflow and the back of the bucket will occur.

[0069] The present invention also provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for determining flow interference of a multi-nozzle impulse turbine in an embodiment of the present invention is implemented.

[0070] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the method for determining flow interference of a multi-nozzle impulse turbine in an embodiment of the present invention is implemented.

[0071] Figure 6 An example of a physical structure diagram of an electronic device is shown below. Figure 6 As shown, the electronic device may include: a processor 810, a communications interface 820, a memory 830, and a communications bus 840. The processor 810, the communications interface 820, and the memory 830 communicate with each other via the communications bus 840. The processor 810 may invoke logic instructions in the memory 830 to execute a method for determining flow interference in a multi-nozzle Pelton turbine. The method includes: step 1: obtaining a first time duration required for a single jet to form a water film and flow into the front of a bucket; step 2: obtaining a second time duration required for the bucket to rotate through the angle formed between two adjacent nozzles; and step 3: determining whether there is flow interference between two jets within the bucket by comparing the first time duration with the second time duration.

[0072] Furthermore, the logic instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product, stored in a storage medium, includes instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0073] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the flow interference determination method for a multi-nozzle impulse turbine provided by the above methods, which method includes: the above steps one to four.

[0074] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, it is implemented to execute the flow interference determination method for a multi-nozzle impulse turbine provided by the above methods, and the method includes: the above steps one to four.

[0075] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0076] Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented using software plus a necessary general-purpose hardware platform, or of course, hardware. Based on this understanding, the essence of the above technical solution, or the portion that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, or an optical disk, and includes a number of instructions for causing a computer device (such as a personal computer, server, or network device) to execute the methods described in each embodiment or certain portions of the embodiments.

[0077] Finally, 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for determining flow interference in a multi-nozzle impulse turbine, characterized in that: include: Obtain the time history curves of the torque on the front and back of the bucket under the action of the jet, as well as the first time required for a single nozzle jet in a multi-nozzle Pelton turbine to flow through any bucket from the time it enters to the time it completely flows out of the front of the bucket; Obtaining a second time duration required for the water bucket to rotate through the angle formed between two adjacent nozzles; By comparing the first time duration with the second time duration, analyzing and determining whether there is flow interference between the two jets inside the water bucket; According to the time course curve of the torque on the back of the bucket, if the bucket torque is negative at the beginning of the jet flowing into the bucket, it is determined that there is flow interference between the jet and the bucket; if the bucket torque is negative at the stage of the jet flowing out of the bucket, it is determined that there is flow interference between the water film outflow and the back of the bucket.

2. The method for determining flow interference in a multi-nozzle impulse turbine according to claim 1, wherein: When the first time duration is less than the second time duration, determining that there is no flow interference between the two jets in the water bucket; When the first time length is greater than or equal to the second time length, it is determined that flow interference between two jets exists inside the bucket.

3. The method for determining flow interference in a multi-nozzle impulse turbine according to claim 1, wherein: The first time required for a single nozzle jet in a multi-nozzle impulse turbine to flow through any bucket from the time it enters to the time it completely flows out of the front face of the bucket is also obtained: The first time required for a single jet to form a water film and flow onto the front of the water bucket is determined by the time history curve of the front torque of the water bucket.

4. The method for determining flow interference in a multi-nozzle impulse turbine according to claim 3, wherein: Before the step of obtaining the time history curves of the torque on the front and back sides of the bucket under the action of the jet, the method further includes: When only a single nozzle is arranged in a multi-nozzle unit, the flow numerical calculation of the runner bucket flow channel is carried out to determine the time history curve of the torque on the front and back of a single bucket under the action of the jet.

5. The method for determining flow interference in a multi-nozzle impulse turbine according to claim 4, wherein: When only a single nozzle is arranged in a multi-nozzle unit, before the step of performing numerical flow calculation on the runner bucket flow channel to determine the time history curve of the torque on the front and back sides of the single bucket under the action of the jet, the following steps are also included: A three-dimensional model of the runner is obtained, and the front and back sides of the bucket are determined according to the three-dimensional model of the runner.

6. The method for determining flow interference in a multi-nozzle impulse turbine according to any one of claims 1 to 5, characterized in that: Obtain the wheel rotation period, and determine the second time required for the water bucket to rotate through the angle between two adjacent nozzles based on the number of nozzles.

7. The method for determining flow interference in a multi-nozzle impulse turbine according to claim 6, wherein: The step of obtaining the rotation period of the runner and determining the second time required for the water bucket to rotate through the angle between two adjacent nozzles according to the number of nozzles specifically includes: By formula: ΔT=60 / n / Z N , calculate the second time required for the water bucket to rotate through the angle between two adjacent nozzles; Where: ΔT is the second time required for the bucket to rotate through the angle between two adjacent nozzles, n is the rotation speed of the runner bucket, Z N is the number of nozzles.

8. The method for determining flow interference in a multi-nozzle impulse turbine according to claim 7, wherein: Z N The value of is greater than or equal to 3.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method for determining flow interference in a multi-nozzle impulse turbine according to any one of claims 1 to 8 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for determining flow interference in a multi-nozzle impulse turbine according to any one of claims 1 to 8 is implemented.

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