Design method for water bucket notch of multi-nozzle impulse turbine

Abstract

The invention provides a design method for a water bucket notch of a multi-nozzle impulse turbine. According to the design method for the water bucket notch of the multi-nozzle impulse turbine, the problems of positioning and optimization of related sizes of the water bucket and the notch are fundamentally solved; the design accuracy and reliability are improved; the close combination of the design of the water bucket notch and the actual working water flow condition of the multi-nozzle impulse turbine is realized; it can be ensured that the interaction between the water bucket notch and water flow in actual operation reaches the optimal state, and energy loss or hydraulic performance reduction caused by unreasonable size is avoided; the shape of the water bucket notch and the shape of the water bucket can be optimally designed in a targeted mode, and the hydraulic efficiency of the multi-nozzle impulse turbine is further improved.

Description

Technical Field

[0001] The present invention relates to the field of fluid machinery, and provides a design method for the notch of the bucket of a multi-nozzle impulse water turbine. Background Art

[0002] In the process of hydropower energy development, impulse water turbines have attracted much attention due to their high potential for efficient utilization of medium, high, and ultra-high head water energy. As a key device for energy conversion, impulse water turbines are of great significance for improving the utilization efficiency of water energy. Its working principle is simple, and the runner is driven to do work by the kinetic energy of the water flow. However, in practical applications, the geometric structure design of the bucket working surface is still a technical difficulty, which directly affects the efficiency of water energy conversion and the operation stability of the equipment.

[0003] Especially in the design of the bucket working surface, the shape optimization of the bucket notch is particularly important. Appropriate bucket notch dimensions can ensure the uniform division of the jet between the buckets and avoid flow interference phenomena in the multi-nozzle structure.

[0004] However, most existing studies focus on the optimization of other geometric parameters of the bucket working surface, such as bucket shape, number of nozzles, etc., and relatively few studies have been conducted on the bucket notch shape. In current research, although there have been some studies on the influence of the bucket notch shape on the hydraulic efficiency of the unit, most of them focus on theoretical analysis, lacking application cases and experimental verification in actual engineering, and failing to systematically solve the specific influence of the bucket notch shape on the performance of the water turbine. Summary of the Invention

[0005] Embodiments of the present invention provide a design method for the notch of the bucket of a multi-nozzle impulse water turbine to solve the defect of the lack of design of the bucket notch shape in related technologies.

[0006] Embodiments of the present invention provide a design method for the notch of the bucket of a multi-nozzle impulse water turbine, including: Based on the rotation center of the bucket runner, determine the bucket coordinate system X B , Y B , Z B , where the Y B axis of the bucket coordinate system is tangent to the base circle of the bucket runner; Confirm that the outlet diameter D Noz of the nozzle and the width of the projection of the bucket working surface in the X B OY B plane is the width B of the bucket; Based on the outlet diameter D Noz of the nozzle and the width B of the bucket, confirm that the maximum value of the notch parallel to the flow direction is the width B Cut, confirm that the maximum value of the notch perpendicular to the flow direction is the height H of the notch Cut ; Apply boundary conditions to perform a flow numerical calculation on the bucket to obtain the time-varying process of the total pressure cloud map of the water film flow of the bucket runner; When the notch can correctly cut the jet without notch overflow, confirm the shape of the notch; Among them, the cross-section of the bucket notch is perpendicular to the X B OY B plane.

[0007] According to an embodiment of the present invention, it further includes: Obtain the projection curve of the bucket notch and confirm the width B of the bucket notch Cut satisfies 0.45D Noz < B Cut and B Cut ≤0.25B, confirm the depth H of the bucket notch Cut satisfies 0.08B ≤ H Cut ≤0.1B.

[0008] According to an embodiment of the present invention, it further includes: Confirm that the projection curve of the bucket notch is y B = f(x B ), and its second derivative y ’’ B ≥0.

[0009] According to an embodiment of the present invention, it further includes: Confirm that the starting position of the projection curve of the bucket notch is x B = H Cut when, y B ≤0.75B Cut .

[0010] According to an embodiment of the present invention, it further includes: Confirm that when the projection curve of the bucket notch reaches the notch height position y B = H Cut when, 0.5B Cut ≤ x B ≤0.6B Cut and the slope of the projection curve of the bucket notch y ’ B = 0.

[0011] According to an embodiment of the present invention, it further includes: Confirm that the end position of the projection curve of the bucket notch is x B = B Cut when, 0 ≤ y B ≤0.75HCut 。

[0012] According to an embodiment of the present invention, the projection curve of the bucket notch is smooth and continuous.

[0013] According to an embodiment of the present invention, the projection curve of the bucket notch satisfies: 。

[0014] According to an embodiment of the present invention, the jet angle between adjacent nozzles is 60 degrees to 180 degrees.

[0015] According to an embodiment of the present invention, the number of nozzles is at least two.

[0016] According to the design method of the bucket notch of the multi-nozzle impulse turbine provided by the embodiment of the present invention, by accurately constructing the bucket coordinate system, the problems of positioning and calculation of the relevant dimensions of the bucket and the notch are fundamentally solved. All subsequent calculations involving spatial positions and dimensional relationships can be carried out within a unified and scientific framework, greatly improving the accuracy and reliability of the design. Determine the width B Cut and height H Cut of the notch based on the nozzle outlet diameter and the bucket width, realizing the close combination of the bucket notch design and the actual working water flow conditions of the impulse turbine. This design method based on actual working condition parameters can ensure that the interaction between the bucket notch and the water flow reaches the optimal state during actual operation, avoiding energy loss or hydraulic performance degradation caused by unreasonable dimensions. Conduct a flow numerical calculation on the bucket runner and obtain the time-varying process of the total pressure cloud diagram of the water film flow, providing a powerful tool for deeply understanding the water flow characteristics inside the bucket. By analyzing the cloud diagram, the pressure distribution of the water flow at different times and positions can be clearly seen, so as to optimize the design of the bucket notch shape and the bucket type in a targeted manner, further improving the hydraulic efficiency of the impulse turbine. Using the correct cutting of the jet and no notch overflow as the basis for confirming the notch shape directly guarantees the high efficiency and stability of the impulse turbine during operation. Correctly cutting the jet means that the bucket can interact with the water flow in the designed expected manner, maximizing the conversion of the kinetic energy of the water flow into the mechanical energy of the impulse turbine; and avoiding notch overflow reduces the additional loss of the water flow, ensuring the stability and reliability of the operation of the multi-nozzle impulse turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic flow chart of the design method for the bucket notch of a multi-nozzle impulse water turbine provided by the present invention.

[0019] Figure 2 It is a schematic coordinate diagram of the bucket coordinate system of a multi-nozzle impulse water turbine provided by the present invention.

[0020] Figure 3 It is a schematic view of the jet of a multi-nozzle impulse water turbine provided by the present invention.

[0021] Figure 4 It is a schematic front view of the working surface of the bucket of a multi-nozzle impulse water turbine provided by the present invention.

[0022] Figure 5 It is a schematic view of the notch size of the bucket of a multi-nozzle impulse water turbine provided by the present invention.

[0023] Figure 6 It is a schematic view of the notch shape of the bucket of a multi-nozzle impulse water turbine provided by the present invention.

[0024] Figure 7 It is the total pressure cloud diagram of the water film flow of the bucket runner provided by the present invention. Specific embodiments

[0025] The following further describes the embodiments of the present invention in detail with reference to the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0026] As Figures 1 to 7 shown, an embodiment of the present invention provides a design method for the bucket notch of a multi-nozzle impulse water turbine, including: Step 10, based on the rotation center of the bucket runner, determine the bucket coordinate system X B , Y B , Z B , where the Y B axis of the bucket coordinate system is tangent to the base circle of the bucket runner; Step 20, confirm that the outlet diameter D Noz of the nozzle and the width of the projection of the working surface of the bucket on the X B OY B plane are the width B of the bucket; Step 30, based on the outlet diameter D Noz of the nozzle and the width B of the bucket, confirm that the maximum value of the notch parallel to the flow direction is the width B Cut of the notch, and confirm that the maximum value of the notch perpendicular to the flow direction is the height H Cut of the notch; Step 40, apply boundary conditions to perform flow numerical calculation on the water bucket to obtain the time-varying process of the total pressure contour of the water film flow of the water bucket runner; Step 50, when the notch of the water bucket can correctly cut the jet and there is no notch overflow, confirm the shape of the notch; Among them, the cross-section of the water bucket notch is perpendicular to the X B OY B plane.

[0027] According to the design method of the water bucket notch of the multi-nozzle impulse water turbine provided by the embodiment of the present invention, by accurately constructing the water bucket coordinate system, the problems of positioning and calculation of the relevant dimensions of the water bucket and the notch are fundamentally solved. All subsequent calculations involving spatial positions and dimensional relationships can be carried out within a unified and scientific framework, greatly improving the accuracy and reliability of the design. Determine the width B Cut and height H Cut of the notch based on the nozzle outlet diameter and the water bucket width, realizing the close combination of the water bucket notch design and the actual working water flow conditions of the impulse water turbine. This design method based on actual working condition parameters can ensure that the interaction between the notch and the water flow reaches the optimal state during actual operation, avoiding energy loss or hydraulic performance degradation caused by unreasonable dimensions. Performing flow numerical calculation on the water bucket runner and obtaining the time-varying process of the total pressure contour of the water film flow provides a powerful tool for deeply understanding the water flow characteristics inside the water bucket. By analyzing the contour map, the pressure distribution of the water flow at different times and different positions can be clearly seen, so as to optimize the design of the notch shape and the water bucket shape in a targeted manner, further improving the hydraulic efficiency of the impulse water turbine. Using the correct cutting of the jet and no notch overflow as the basis for confirming the notch shape directly guarantees the high efficiency and stability of the impulse water turbine during operation. Correctly cutting the jet means that the water bucket can interact with the water flow in the way expected by the design, maximizing the conversion of the kinetic energy of the water flow into the mechanical energy of the impulse water turbine; and avoiding notch overflow reduces the additional loss of the water flow, ensuring the stability and reliability of the operation of the impulse water turbine.

[0028] Please continue to refer to Figures 1 to 7 , the design method of the water bucket notch of the multi-nozzle impulse water turbine provided by the embodiment of the present invention aims to simplify the design method of the water bucket notch shape of the multi-nozzle impulse water turbine through this design method, and ensure that the impulse water turbine has high hydraulic efficiency and avoid the occurrence of cavitation and flow interference.

[0029] Specifically, first, in Step 10, taking the rotation center of the water bucket runner as the reference point, construct the water bucket coordinate system X B , Y B , Z B . This coordinate system has a special geometric setting, and its Y BThe shaft is tangent to the base circle of the water bucket runner, and this setting provides a stable and scientific spatial reference system for the subsequent accurate description and calculation of the dimensions of each part of the water bucket.

[0030] In step 20, the outlet diameter D of the nozzle is determined. Noz , and at the same time, the width of the projection of the working surface of the water bucket in the X B OY B plane is defined as the width B of the water bucket. These two parameters are important basic data for the subsequent design of the notch size, and they reflect the water flow input during the operation of the impulse turbine and the geometric characteristics of the water bucket itself in the key plane.

[0031] In step 30, using the outlet diameter D of the nozzle Noz and the width B of the water bucket, through a specific calculation logic or empirical formula, the maximum value of the water bucket notch parallel to the flow direction is confirmed and defined as the width B Cut of the notch; similarly, the maximum value of the water bucket notch perpendicular to the flow direction is determined, that is, the height H Cut of the notch. This step clarifies the key dimensions of the notch in the spatial dimension and prepares for the subsequent design and performance analysis.

[0032] In step 40, by applying appropriate boundary conditions, a flow numerical calculation is performed on the water bucket. In this process, using computer simulation technology, the flow of water in the water bucket runner is accurately simulated, and finally the time-varying process of the total pressure cloud diagram of the water film flow of the water bucket runner is obtained. This cloud diagram can intuitively and detailedly display the pressure distribution state of the water flow at different times inside the water bucket, providing rich data information for in-depth analysis of the hydraulic performance of the water bucket.

[0033] In step 50, taking that the water bucket notch can correctly cut the jet and there is no notch overflow as the judgment criterion, the shape of the water bucket notch is finally confirmed. And it is clearly stipulated that the cross-section of the water bucket notch is perpendicular to the X B OY B plane. This limiting condition ensures the geometric adaptability of the notch shape design to the entire water bucket coordinate system and the water flow movement direction, thus ensuring the hydraulic efficiency and stability of the impulse turbine during operation.

[0034] According to an embodiment of the present invention, it further includes: Obtain the projection curve of the water bucket notch and confirm that the notch width B Cut satisfies 0.45D Noz < B Cut and B Cut ≤0.25B, confirm the notch depth H Cut satisfies 0.08B ≤ H Cut ≤0.1B.

[0035] In one embodiment of the present invention, by defining the notch width B Cut and the nozzle outlet diameter D Noz , the relationship with the bucket width B, as well as the notch depth H Cut and the relationship with the bucket width B, provide a quantitative standard for determining the specific size range of the notch. During the actual design process, according to these standards, under the given parameters of the impulse turbine, the notch sizes that meet the requirements can be quickly screened out, reducing the unnecessary trial-and-error process.

[0036] Setting a reasonable notch size range helps to optimize the interaction between the bucket and the jet. An appropriate notch width can ensure that the jet is more evenly divided among the buckets, avoiding uneven water flow distribution caused by too wide or too narrow notches, thereby improving the water energy conversion efficiency; while an appropriate notch depth can ensure that when the bucket cuts the jet, it will neither affect the cutting effect due to insufficient depth nor cause additional energy loss due to excessive depth, further ensuring the efficient and stable operation of the impulse turbine.

[0037] According to one embodiment of the present invention, it further includes: Confirming the projection curve y B = f(x B ), and its second derivative y ’’ B ≥0.

[0038] In one embodiment of the present invention, the requirement for the second derivative of the bucket notch projection curve defines the bending characteristics of the curve from a mathematical perspective. It means that the bucket notch projection curve is in a convex-down or straight shape. During the actual design, when drawing or calculating the bucket notch projection curve, this condition needs to be used to adjust and optimize the curve to ensure that the curve meets the requirements.

[0039] Ensuring that the second derivative y ’’ B ≥0 of the bucket notch projection curve can make the changes in the velocity and pressure of the water flow more smooth and stable when passing through the bucket notch. If the bucket notch projection curve is convex-down, when the water flow contacts the bucket notch and enters the bucket, it can better fit the surface and flow, reducing the turbulence and energy loss of the water flow; in contrast, if the bucket notch projection curve does not meet this condition, it may cause adverse phenomena such as separation and vortex of the water flow at the bucket notch, reducing the hydraulic efficiency of the impulse turbine, and this condition effectively avoids the occurrence of such situations.

[0040] According to one embodiment of the present invention, it further includes: Confirming that when the starting position of the bucket notch projection curve is x B = H Cut , y B ≤0.75BCut 。

[0041] In an embodiment of the present invention, the coordinate constraint conditions for the starting position of the projection curve of the bucket notch are defined, providing an accurate basis for determining the starting position of the projection curve of the bucket notch. During the design process, when the height H Cut and width B Cut of the notch are determined, the position of the projection curve of the bucket notch at the starting point is determined according to this condition to ensure the accuracy of the starting position of the curve.

[0042] This constraint condition can ensure a reasonable contact mode between the bucket notch and the jet at the initial stage. When the bucket notch starts to cut the jet, if y B ≤0.75B Cut , it can enable the jet to enter the bucket notch at a more appropriate angle and position when initially contacting the bucket notch, avoiding excessive impact or deviation of the jet at the initial stage, which is beneficial to the stable flow and energy conversion of the subsequent jet in the bucket, and improving the overall performance of the impulse turbine.

[0043] According to an embodiment of the present invention, it further includes: Confirm that when the projection curve of the bucket notch reaches the notch height position where y B =H Cut , 0.5B Cut ≤x B ≤0.6B Cut and the slope of the projection curve of the bucket notch y ’ B =0.

[0044] In an embodiment of the present invention, the abscissa range and slope conditions of the projection curve of the bucket notch when it reaches the notch height are specified, further refining the shape characteristics of the projection curve of the bucket notch. When designing the projection curve of the bucket notch, it is necessary to make the abscissa of the projection curve of the bucket notch fall between 0.5B Cut and 0.6B Cut when it reaches the notch height H Cut , and the slope of the projection curve of the bucket notch is 0 at this time to meet the shape requirements of this specific position.

[0045] When the projection curve of the bucket notch satisfies the above conditions when y B =H Cut , it indicates that the projection curve of the bucket notch is relatively gentle at the maximum height of the notch. This helps the water flow to transition smoothly when reaching the maximum height of the notch, reducing the impact and energy loss of the water flow. At the same time, the appropriate abscissa range can ensure that the interaction between the bucket notch and the jet at this position is in an ideal state, which is beneficial to the water flow to better enter the bucket and improve the hydraulic performance and energy conversion efficiency of the multi-nozzle impulse turbine.

[0046] According to an embodiment of the present invention, it further includes: Confirm that the termination position of the projection curve of the bucket notch is x B =B Cut When, 0 ≤ y B ≤ 0.75H Cut .

[0047] In an embodiment of the present invention, determining the coordinate range of the termination position of the projection curve of the bucket notch sets clear boundary conditions for the end point of the curve. During the design process, when the width B of the bucket notch Cut is determined, the vertical coordinate range of the end point of the curve is determined according to this condition to complete the design of the curve.

[0048] This condition ensures that the shape of the bucket notch at the termination is reasonable. When the notch cutting jet ends, 0 ≤ y B ≤ 0.75H Cut The range can enable the water flow to enter the next bucket or flow out of the impulse turbine in a relatively stable state when leaving the notch, avoiding situations such as water flow disorder and splashing caused by unreasonable notch termination positions, reducing energy loss, and ensuring the stability and hydraulic efficiency of the impulse turbine operation.

[0049] According to an embodiment of the present invention, the projection curve of the bucket notch is smooth and continuous.

[0050] In an embodiment of the present invention, requiring the projection curve of the bucket notch to be smooth and continuous means that there are no sudden changes or sharp corners in the projection curve of the bucket notch. In actual design, whether using mathematical model calculation or drawing with drawing software, the smoothness of the projection curve of the bucket notch throughout the interval should be ensured, and discontinuous points should be avoided.

[0051] The smooth and continuous projection curve of the bucket notch can enable the water flow to have a stable flow state when passing through the notch, without generating additional pressure fluctuations and energy losses due to sudden changes in the projection curve of the bucket notch. At the same time, it is also beneficial to reduce the erosion of the water flow on the notch and the surface of the bucket, extend the service life of the components of the impulse turbine, and improve the reliability and stability of the operation of the impulse turbine.

[0052] According to an embodiment of the present invention, the projection curve of the bucket notch satisfies: .

[0053] In an embodiment of the present invention, if the projection curve of the bucket notch satisfies a specific functional relationship, the coordinates of each point on the curve can be accurately calculated according to this function, thereby accurately drawing the projection curve of the bucket notch.

[0054] This precise function description can ensure that the design of the bucket gap projection curve is highly accurate and consistent. When designing different impulse turbines, as long as they are calculated and designed according to the same function relationship, the rationality and effectiveness of the gap shape can be guaranteed, which is conducive to large-scale production and application. At the same time, the gap designed based on this function can better adapt to the flow characteristics of the water flow and improve the hydraulic efficiency and performance stability of the impulse turbine.

[0055] That is, by accurately defining the shape of the projection curve of the bucket notch of the impulse turbine, the notch shape can be made to meet the requirements of water flow dynamics in the bucket design, thereby improving the hydraulic performance of the impulse turbine.

[0056] According to one embodiment of the present invention, the jet angle between adjacent nozzles is 60 degrees to 180 degrees.

[0057] In one embodiment of the present invention, in the design of a multi-nozzle impulse turbine, the range of the jet angles of adjacent nozzles is specified. During the actual installation and commissioning process, the jet angles of adjacent nozzles are set between 60 degrees and 180 degrees according to the specific structure and performance requirements of the impulse turbine.

[0058] The appropriate jet angle can effectively avoid mutual interference between jets in a multi-nozzle structure. When the jet angle is within this range, the water flow ejected from each nozzle can impact the bucket more evenly, making the bucket more evenly stressed and improving the water energy conversion efficiency. At the same time, avoiding jet interference also helps reduce water turbulence and energy loss, ensure the stability of the impulse turbine operation, and reduce vibration and noise during equipment operation.

[0059] According to an embodiment of the present invention, the number of nozzles is at least two.

[0060] In one embodiment of the present invention, when designing and manufacturing an impulse turbine, the specific number of nozzles is determined according to actual needs, and generally a suitable number of nozzles is selected on the premise of meeting cost and performance requirements.

[0061] The multi-nozzle impulse turbine combines the jet energy of multiple nozzles to make more effective use of the kinetic energy of the water flow. Compared with the single-nozzle turbine, multiple nozzles simultaneously spray water to the bucket, which enables the bucket to obtain more energy per unit time and improves the output power of the impulse turbine. At the same time, the design of multiple nozzles can also increase the adaptability of the impulse turbine to different working conditions, maintain a high hydraulic efficiency under different water flow conditions, and expand the application range of the impulse turbine.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements 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 design method for the notch of the bucket of a multi-nozzle impulse water turbine, characterized in that, Including: Determine the bucket coordinate system X based on the rotation center of the water bucket runner B , Y B , Z B , where the Y B axis of the bucket coordinate system is tangent to the base circle of the water bucket runner; Confirm the outlet diameter D of the nozzle Noz The width of the projection of the working surface of the water bucket on the X B OY B plane is the width B of the water bucket; Based on the outlet diameter D of the nozzle Noz With the width B of the water bucket, it is confirmed that the maximum value of the notch parallel to the flow direction is the width B of the notch Cut , and it is confirmed that the maximum value of the notch perpendicular to the flow direction is the height H of the notch Cut ; Applying boundary conditions to perform numerical flow calculations on the water buckets to obtain the time-varying history of the total pressure contour of the water film flow of the Pelton wheel; When the notch can correctly cut the jet without notch overflow, confirming the shape of the notch; Among them, the cross-section of the water bucket notch is perpendicular to the X B OY B plane.

2. The design method of the bucket notch of the multi-nozzle impulse water turbine according to claim 1, characterized in that, Also including: Obtain the projection curve of the water bucket notch and confirm the notch width B Cut Satisfy 0.45D Noz < B Cut And B Cut ≤ 0.25B, confirm the notch depth H Cut Satisfy 0.08B ≤ H Cut ≤ 0.1B.

3. The design method of the notch of the bucket of the impulse water turbine according to claim 1, characterized in that, Also including: Confirm the projection curve y of the water bucket notch B = f(x B ), and its second derivative y ’’ B ≥ 0.

4. The design method of the bucket notch of the multi-nozzle impulse water turbine according to claim 1, characterized in that, Also including: Confirm that the starting position of the projection curve of the bucket notch is x B =H Cut When, y B ≤0.75B Cut .

5. The design method of the bucket notch of the multi-nozzle impulse water turbine according to claim 1, characterized in that, Also including: Confirm that the projection curve of the bucket notch reaches the notch height position of y B =H Cut When, 0.5B Cut ≤x B ≤0.6B Cut And the slope y of the projection curve of the bucket notch ’ B =0.

6. The design method of the bucket notch of the multi-nozzle impulse water turbine according to claim 1, characterized in that, Also including: Confirm that the termination position of the projection curve of the bucket notch is x B =B Cut When, 0 ≤ y B ≤ 0.75H Cut .

7. The design method of the bucket notch of the multi-nozzle impulse water turbine according to any one of claims 2 to 6, characterized in that The projection curve of the water bucket notch is smooth and continuous.

8. The design method of the bucket notch of the multi-nozzle impulse water turbine according to any one of claims 2 to 6, characterized in that, The projection curve of the water bucket notch satisfies: 。 9. The design method of the bucket notch of the multi-nozzle impulse water turbine according to any one of claims 1 to 6, characterized in that, The jet angle between adjacent nozzles is 60 degrees to 180 degrees.

10. The design method of the bucket notch of the multi-nozzle impulse water turbine according to any one of claims 1 to 6, characterized in that The water turbine is a multi-nozzle impulse water turbine, and the number of nozzles is at least two.

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