Method and equipment for judging flow interference of multi-nozzle impulse turbine and medium

Abstract

The invention relates to the technical field of water turbines, in particular to a method and equipment for judging flow interference of a multi-nozzle impulse turbine and a medium. The method for judging the flow interference of the multi-nozzle impulse turbine comprises the following steps of: 1, acquiring a first duration required by any one water bucket from flowing into the front surface of the water bucket to completely flowing out of the front surface of the water bucket and a history curve of torque along with time under the action of jet flow on the front surface and the back surface of the water bucket; step 2, acquiring a second time length required by the bucket to rotate through an included angle between two adjacent nozzles; step 3, comparing the first time length with the second time length to analyze and judge whether flow interference between two jets exists in the water bucket or not; and 4, judging whether flow interference can occur in the multi-nozzle impulse turbine or not and judging the type of the flow interference by comparing and analyzing the course curve of the back torque of the water bucket along with the time. According to the method, the flow interference risk of the impulse turbine can be evaluated, so that the hydraulic efficiency and the operation stability of the impulse turbine are improved.

Description

Technical Field

[0001] The invention relates to the technical field of water turbines, and in particular to a method, equipment and medium for determining flow interference of a multi-nozzle impulse water 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 operating stability of the unit. Flow interference inside the runner bucket and other types of flow interference will lead to a significant decrease in hydraulic efficiency. A complete 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 of the flow interference between the two jets on the bucket surface under different operating conditions, as well as the analysis method of 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 capable of predicting the flow process in a runner bucket of a multi-nozzle impulse turbine only by simulating a single nozzle jet, flow interference between two jets inside the bucket, and a determination method for two types of flow interference on the back of the bucket, resulting in low hydraulic efficiency of the designed impulse turbine.

[0004] The present invention provides a method for determining flow interference of a multi-nozzle impulse turbine, comprising: Obtain the time history curve of the torque on the front and back of the bucket under the action of the jet, and the first time required for a single nozzle jet in a 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 of the bucket; Obtaining the second time required for the water bucket to rotate through the angle between two adjacent nozzles; By comparing the first time length with the second time length, analyzing and judging whether there is flow interference between two jets inside the water bucket; According to the time course curve of the torque on the back of the bucket, at the beginning of the jet flowing into the bucket, if the bucket torque is negative, it is determined that there is flow interference between the jet and the bucket; at the stage when the jet flows out of the bucket, if the bucket torque is negative, it is determined that there is flow interference between the water film outflow and the back of the bucket.

[0005] According to the method for determining flow interference of 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 two jets inside the 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.

[0006] According to the method for determining flow interference of a multi-nozzle impulse turbine provided by the present invention, the 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 flows out of the bucket, further includes: 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.

[0007] According to the method for determining flow interference of a multi-nozzle impulse turbine provided by the present invention, before the step of obtaining the torque history curves of the front and back sides of the bucket under the action of the jet over time, the method further includes: When only a single nozzle is arranged in the 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.

[0008] According to the method for determining flow interference of 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 torque history curve of the front and back of a single bucket under the action of the jet over time, the method further includes: 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.

[0009] According to the method for determining flow interference in a multi-nozzle impulse turbine provided by the present invention, the impeller 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.

[0010] According to the method for determining flow interference of 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 according to 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 turn through the angle between two adjacent nozzles; where: ΔT is the second time required for the bucket to turn through the angle between two adjacent nozzles, n is the speed of the bucket wheel, Z N is the number of nozzles.

[0011] According to the method for determining flow interference of a multi-nozzle impulse turbine provided by the present invention, Z N The value is greater than or equal to 3.

[0012] 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 of the present invention when executing the program.

[0013] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method of determining flow interference of a multi-nozzle impulse turbine of the present invention is implemented.

[0014] The present invention provides a method, device and medium for judging flow interference of a multi-nozzle impulse turbine. The method for judging flow interference of a multi-nozzle impulse turbine comprises the following steps: step 1, obtaining the first time required for a single nozzle jet in a multi-nozzle impulse turbine to flow through any bucket from inflow to full outflow on the front of the bucket, and the time course curve of the torque under the action of the jet on the front and back of the bucket; step 2, obtaining the second time required for the bucket to turn through the angle between two adjacent nozzles; step 3, by comparing the first time and the second time, analyzing and judging whether there is flow interference between two jets inside the bucket; step 4, according to the time course curve of the torque on the back of the bucket, at the beginning stage of the jet flowing into the bucket, if the bucket torque is a negative value, it is determined that there is flow interference between the jet and the bucket; at the stage of the jet flowing out of the bucket, if the bucket torque is a negative value, it is determined that there is flow interference between the water film outflow and the back of the bucket.

[0015] 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 turn through the angle formed between two adjacent nozzles. The present invention compares and analyzes at which stage a negative value appears on the back side of the bucket torque, which will lead to two other risks of flow interference. In 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 side of the bucket is ensured not to have negative values ​​as much as possible to avoid the risk of flow interference between the jet or water film outflow and the back side of the bucket. Thereby, the problem of hydraulic loss and reduced operating stability of the unit caused by the torque is avoided, thereby improving the hydraulic efficiency and operating stability of the impulse turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces 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 creative work.

[0017] Figure 1 It is one of the flow diagrams of the method for determining flow interference of a multi-nozzle impulse turbine provided by the present invention.

[0018] 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.

[0019] Figure 3 It is a front structural schematic diagram of the water bucket provided by the present invention.

[0020] Figure 4 It is a schematic diagram of the back structure of the water bucket provided by the present invention.

[0021] Figure 5 It is a curve diagram showing the torque of the bucket provided by the present invention over time.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Fig. 9 It is a structural schematic diagram of the electronic device provided by the present invention.

[0026] Reference numerals: 810, processor; 820, communication interface; 830, memory; 840, communication bus. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] 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" and the like indicate positions or positional relationships based on the positions or positional relationships 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 devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0030] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means 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 embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0032] Combine the following Figure 1-Figure 9 The present invention describes a method for determining flow interference in a multi-nozzle impulse turbine. Figure 1 As shown, the method for determining flow interference of a multi-nozzle impulse turbine specifically includes the following determination steps: Step 1: Obtain the time history curve of the torque on the front and back of the bucket under the action of the jet, and the first time required for a single nozzle jet in a 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 of the bucket; Step 2, obtaining a second time required for the water bucket to rotate to the angle between two adjacent nozzles; Step 3, by comparing the first time length with the second time length, analyzing and judging whether there is flow interference between the two jets inside the water bucket; Step 4: According to the time-dependent torque curve of the back of the bucket, at the beginning of the jet flowing into the bucket, if the bucket torque is negative, it is determined that there is flow interference between the jet and the bucket; at the stage of the jet flowing out of the bucket, if the bucket torque is negative, it is determined that there is flow interference between the water film outflow and the back of the bucket.

[0033] 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.

[0034] To analyze and determine whether flow interference will occur in the multi-nozzle impulse turbine, and the type of flow interference. Specifically, by obtaining 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, and the second time required for the bucket to turn the angle between two adjacent nozzles, the magnitude relationship between the first time and the second time is compared, so as to determine the flow interference of the multi-nozzle impulse turbine.

[0035] 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. There is an intersection in the movement period of the two adjacent jets on the front of the same bucket, and there is a risk of interference between the two jets inside the bucket. Therefore, in 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 in the runner design stage of the impulse turbine, such flow interference problems can be reduced or even avoided.

[0036] The present invention provides a method for determining flow interference in a multi-nozzle impulse turbine, which comprises the following steps: step one, 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 flows out of the front of the bucket, and a time course curve of the torque on the front and back of the bucket under the action of the jet; step two, obtaining a second time required for the bucket to rotate through the angle between two adjacent nozzles; step three, analyzing and determining whether there is flow interference between the two jets inside the bucket by comparing the first time course with the second time course; step four, according to the time course curve of the torque on the back of the bucket, at the beginning stage of the jet flowing into the bucket, if the bucket torque is a negative value, it is determined that there is flow interference between the jet and the bucket; at the stage of the jet flowing out of the bucket, if the bucket torque is a negative value, it is determined that there is flow interference between the water film outflow and the back of the bucket.

[0037] 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 turn through the angle formed between two adjacent nozzles. The present invention compares and analyzes at which stage a negative value appears on the back side of the bucket torque, which will lead to two other risks of flow interference. In 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 side of the bucket is ensured not to have negative values ​​as much as possible to avoid the risk of flow interference between the jet or water film outflow and the back side of the bucket. Thereby, the problem of hydraulic loss and reduced operating stability of the unit caused by the torque is avoided, thereby improving the hydraulic efficiency and operating stability of the impulse turbine.

[0038] 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 entering to completely flowing out of the front of the bucket, that is, before step 1, it also includes: S3, determining the first time required for a single jet to form a water film and flow into the front of the bucket through a curve of the front torque of the bucket over time. Figure 3 As shown, it is a schematic diagram of the front structure of the water bucket; Figure 4 As shown in FIG. 1 , 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 torques 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.

[0039] In one embodiment of the present invention, the first time required for a single jet to form a water film flowing 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 for the bucket to rotate around the central axis of the runner after receiving the jet inflow; the vertical axis is C T , which means the torque of the bucket. The torque history curve is determined based on the torque of the front and back of the bucket read after the flow calculation; through the correspondence between the horizontal and vertical coordinates, the physical time corresponding to the horizontal coordinate of the front of the bucket under the vertical coordinate is read out, and the value of the physical time is the required first time. In addition, time 0 is defined as the moment when the tip of the bucket touches the surface of the jet, and the jet will flow into the bucket at the next moment.

[0040] In one embodiment of the present invention, before the step of obtaining the torque history curve of the front and back of the bucket under the action of the jet over time, that is, before step S3, it also includes: S2, when only a single nozzle is arranged in the multi-nozzle unit, the flow numerical calculation of the runner bucket flow channel is performed to determine the torque history curve of the front and back of the single bucket under the action of the jet over time. Specifically, the unsteady multiphase flow numerical calculation of the runner bucket is carried out based on the ANSYS CFX software through the CFD method to obtain the torque history curve of the front and back of the bucket under the impact of a single nozzle over time. In this embodiment, the torque history curve of the front and back of the bucket over time is obtained by numerical calculation of the flow inside the runner bucket, so as to determine the first time required for a single nozzle jet to flow through any bucket from inflow to full outflow on the front of the bucket.

[0041] In one embodiment of 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 torque history curve of the front and back of a single bucket under the action of the jet over time, that is, before step S2, it also includes: S1, obtaining a three-dimensional model of the runner, and determining the front and back of the bucket according to the three-dimensional model of the runner. Specifically, the runner can be scanned by an image acquisition device to form a three-dimensional model, or the three-dimensional model of the runner of a specified model can be directly imported into the image processing and recognition system, and each bucket can be divided into the front and back by processing and recognizing the three-dimensional model; the front three-dimensional model of the bucket is obtained, which is used in step S2 to determine the torque history curve of the front and back of the bucket over time by the method of flow numerical calculation.

[0042] In one embodiment of the present invention, the impeller rotation period is obtained, and the second time required for the bucket to rotate through the angle between two adjacent nozzles is determined based on the number of nozzles. The method for judging flow interference of a multi-nozzle impulse turbine in the embodiment of the present invention is applicable to the method for judging flow interference of multiple nozzles, and the number of nozzles is greater than or equal to 3. This embodiment preferably uses a 6-nozzle impulse turbine to judge the flow interference risk of the 6-nozzle impulse turbine. The impeller rotation period and the number of nozzles are used to judge the time required for the bucket to rotate through the angle between two adjacent nozzles, that is, the second time.

[0043] 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: by the formula: ΔT=60 / n / Z N , calculate the second time required for the bucket to turn through the angle between two adjacent nozzles; where: ΔT is the second time required for the bucket to turn 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.

[0044] In one embodiment of the present invention, Z N The value is greater than or equal to 3.

[0045] Figure 1 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: Step 1: Obtain the time history curve of the torque on the front and back of the bucket under the action of the jet, and the first time required for a single nozzle jet in a 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 of the bucket; Step 2, obtaining a second time required for the water bucket to rotate to the angle between two adjacent nozzles; Step 3, by comparing the first time length with the second time length, analyzing and judging whether there is flow interference between the two jets inside the water bucket; Step 4: According to the time-dependent torque curve of the back of the bucket, at the beginning of the jet flowing into the bucket, if the bucket torque is negative, it is determined that there is flow interference between the jet and the bucket; at the stage of the jet flowing out of the bucket, if the bucket torque is negative, it is determined that there is flow interference between the water film outflow and the back of the bucket.

[0046] Figure 2 FIG. 1 is one of the flow charts of the method for determining flow interference of a multi-nozzle impulse turbine provided by the present invention, such as Figure 2 As shown, the method includes the following: S1. Obtain a three-dimensional model of the runner, and determine the front and back sides of the bucket according to the three-dimensional model of the runner; S2. When only a single nozzle is arranged in a multi-nozzle unit, numerical calculation of the flow of the runner bucket flow channel is performed to determine the torque history curve of the front and back of a single bucket under the action of the jet over time; S3, obtaining the torque history curves of the front and back of the bucket under the action of the jet over time, and the first time required for a single nozzle jet in a multi-nozzle impulse turbine to flow through any bucket from the time it flows into to the time it completely flows out of the front of the bucket; S4. Obtain the wheel rotation period and the number of nozzles by the formula: ΔT=60 / n / Z N , calculate the second time required for the bucket to turn through the angle between two adjacent nozzles; where ΔT is the second time required for the bucket to turn 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; S5. Compare the magnitude relationship between the first duration and the second duration 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 flows into the front of the bucket, and the two adjacent jets have an intersection in the movement period of the same bucket front, and there is a risk of interference between the two jet flows inside the bucket. Compare and analyze the time course curve of the back of the bucket. If it is a negative value at the beginning of the jet flowing into the bucket, it means that flow interference between the jet and the bucket will occur; if it is a negative value at the stage when the jet flows out of the bucket, it means that flow interference between the water film outflow and the back of the bucket will occur.

[0047] 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.

[0048] 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.

[0049] Figure 6An example of a physical structure diagram of an electronic device is shown in FIG. Figure 6 As shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication interface 820 and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute a method for determining flow interference of a multi-nozzle impulse turbine, the method comprising: step 1, obtaining a first time required for a single jet to form a water film flowing into the front of a bucket; step 2, obtaining a second time required for the bucket to turn through the angle between two adjacent nozzles; step 3, by comparing the first time and the second time, determining whether there is flow interference between two jets inside the bucket.

[0050] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0051] 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, and the method includes: steps one to four mentioned above.

[0052] 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: steps one to four mentioned above.

[0053] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0054] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0055] 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 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 curve of the torque on the front and back of the bucket under the action of the jet, and the first time required for a single nozzle jet in a 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 of the bucket; Obtaining the second time required for the water bucket to rotate through the angle between two adjacent nozzles; By comparing the first time length with the second time length, analyzing and judging whether there is flow interference between two jets inside the water bucket; According to the time course curve of the torque on the back of the bucket, at the beginning of the jet flowing into the bucket, if the bucket torque is negative, it is determined that there is flow interference between the jet and the bucket; at the stage when the jet flows out of the bucket, if the bucket torque is negative, 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 of a multi-nozzle impulse turbine according to claim 1, characterized in that: 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 inside the 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 of a multi-nozzle impulse turbine according to claim 1, characterized in that: The first time required for a single nozzle jet in a 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 bucket, further includes: 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 of a multi-nozzle impulse turbine according to claim 3, characterized in that: Before the step of obtaining the torque history curves of the front and back sides of the bucket under the action of the jet over time, the step also includes: When only a single nozzle is arranged in the 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 of a multi-nozzle impulse turbine according to claim 4, characterized in that: In the case where only a single nozzle is arranged in the multi-nozzle unit, before the step of performing numerical flow calculation on the runner bucket flow channel to determine the torque history curve of the front and back of a single bucket under the action of the jet over time, it also includes: 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 of a multi-nozzle impulse turbine according to any one of claims 1 to 5, characterized in that: The rotation period of the runner is obtained, and based on the number of nozzles, the second time required for the water bucket to rotate through the angle between two adjacent nozzles is determined.

7. The method for determining flow interference of a multi-nozzle impulse turbine according to claim 6, characterized in that: 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 of a multi-nozzle impulse turbine according to claim 7, characterized in that: Z N The value 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 occurring 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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