CN114934872A - Method and device for jointly inhibiting pressure pulsation of high-part load of water turbine - Google Patents
Method and device for jointly inhibiting pressure pulsation of high-part load of water turbine Download PDFInfo
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- CN114934872A CN114934872A CN202210755159.9A CN202210755159A CN114934872A CN 114934872 A CN114934872 A CN 114934872A CN 202210755159 A CN202210755159 A CN 202210755159A CN 114934872 A CN114934872 A CN 114934872A
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- 230000010349 pulsation Effects 0.000 title claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000002401 inhibitory effect Effects 0.000 title abstract description 5
- 230000036961 partial effect Effects 0.000 claims abstract description 27
- 230000005764 inhibitory process Effects 0.000 claims abstract description 10
- 230000001629 suppression Effects 0.000 claims description 12
- 230000002829 reductive effect Effects 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000013016 damping Methods 0.000 claims 1
- 230000006698 induction Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011162 downstream development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2220/00—Application
- F05B2220/30—Application in turbines
- F05B2220/32—Application in turbines in water turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/10—Stators
- F05B2240/12—Fluid guiding means, e.g. vanes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Hydraulic Turbines (AREA)
Abstract
The invention discloses a method and a device for jointly inhibiting pressure pulsation of a high-part load of a water turbine, wherein the method comprises the following steps: acquiring the associated information of the high part load pressure pulsation and the draft tube vortex band; and carrying out graded lengthening of the runner drainage cone and adjustment of the curvature of the draft tube according to the correlation information of the high partial load pressure pulsation and the draft tube vortex band so as to realize inhibition of the high partial load pressure pulsation of the water turbine. By adopting the technical scheme of the invention, the high-part load pressure pulsation of the water turbine is inhibited, and the safe and stable operation of the water turbine is ensured.
Description
Technical Field
The invention belongs to the technical field of water turbines, and particularly relates to a method and a device for jointly inhibiting high-part load pressure pulsation of a water turbine by means of stepped lengthening of a drain cone and curvature control of a draft tube.
Background
The high-part load pressure pulsation is firstly discovered in a model test of the water turbine, and the method is characterized in that the water turbine operates under the condition that the larger opening degree is close to the optimal condition, and along with the increase of the load, the pressure pulsation which is shown in figure 1 and is increased rapidly and then attenuated rapidly and disappears appears in the water turbine. The conditions under which such pressure pulsations occur are typically in the 70% -90% load range, with the peak occurring around 80% load; the pressure pulsation amplitude is high and can reach 30% of that of a water purification head; the high partial load pressure pulsation has the remarkable characteristics of high amplitude, high frequency and large noise, and the excitation energy is huge, so that the abnormal vibration of a unit can be caused, the plant resonance is induced, and the safe and stable operation of a power station is seriously threatened.
The GE company encounters the problem of high part load pressure pulsation in the development process of the three gorges left bank unit, and the problem of the high part load pressure pulsation draws key attention in the research and development design of a water turbine; the main methods for solving the problem of high partial pressure pulsation at present are as follows: air is supplemented at the outlet of the rotating wheel, the line type of the rotating wheel blade is optimized, and the rotating wheel is replaced. However, the efficiency of the water turbine is lost by supplementing air at the outlet of the runner; the solutions for optimizing the rotor blade profile and for changing the rotor are usually technically complicated and time-consuming to adjust.
Disclosure of Invention
The invention aims to provide a method and a device for jointly inhibiting pressure pulsation of a high part load of a water turbine.
In order to achieve the purpose, the invention adopts the following technical scheme:
a combined inhibition method for high-part load pressure pulsation of a water turbine comprises the following steps:
step S1, acquiring the associated information of the high part load pressure pulsation and the draft tube vortex strip;
and step S2, carrying out step lengthening of the runner drainage cone and draft tube curvature adjustment according to the related information of the high partial load pressure pulsation and the draft tube vortex strip so as to realize the suppression of the high partial load pressure pulsation of the water turbine.
Preferably, in step 1, the frequencies of the revolution and rotation parameters of the vortex bands represented by the different cross sections are obtained, and the frequency characteristics of the high partial load pressure pulsation frequency of the draft tube corresponding to the different cross sections are compared and analyzed, so that the correlation information of the high partial load pressure pulsation and the draft tube vortex bands is obtained.
Preferably, the resonant frequency of the high part load pressure pulsations is about 1.72f n ，f n Is the frequency conversion.
Preferably, the stepped lengthened runner drain cone specifically comprises: the runner cone of the lengthened section is cylindrical, the length of the first-stage runner cone is equal to that of the second-stage runner cone, and the second-stage runner cone exceeds the plane of the lower ring of the runner.
Preferably, the adjusting of the curvature of the draft tube specifically comprises: the height of the draft tube is increased and the radius of curvature of the elbow section is reduced to increase the length of the straight tapered section of the draft tube.
The invention also provides a combined suppression device for high part load pressure pulsation of a water turbine, which comprises:
the acquisition module is used for acquiring the associated information of the high-part load pressure pulsation and the draft tube vortex band;
and the inhibition module is used for carrying out graded lengthening of the runner drainage cone and curvature adjustment of the draft tube according to the correlation information of the high partial load pressure pulsation and the draft tube vortex strip so as to realize inhibition of the high partial load pressure pulsation of the water turbine.
Preferably, the acquisition module is used for acquiring the frequencies of revolution and rotation parameters of the vortex bands represented by different cross sections, and comparing and analyzing the frequencies with the frequency characteristics of the high partial load pressure pulsation of the draft tube corresponding to different cross sections to obtain the associated information of the high partial load pressure pulsation and the vortex bands of the draft tube.
Preferably, the resonance frequency of the high part load pressure pulsation is about 1.72f n ，f n Is the frequency conversion.
Preferably, the stepped lengthened runner drain cone specifically comprises: the drain cone of the lengthened section is cylindrical, the length of the first-stage drain cone is equal to that of the second-stage drain cone, and the second-stage drain cone exceeds the plane of the lower ring of the rotating wheel; the method is characterized in that the curvature of the draft tube is adjusted as follows: the height of the draft tube is increased and the radius of curvature of the elbow section is reduced to increase the length of the straight tapered section of the draft tube.
On the basis that the high-part load pressure pulsation is directly related to the draft tube vortex band, the high-part load pressure pulsation of the water turbine is restrained by means of graded lengthening of the runner discharge cone and draft tube curvature control according to the resonance theory of the high-part load pressure pulsation, the effect is obvious, the safe and stable operation of the water turbine is guaranteed, the hydraulic turbine has good applicability and popularization, and the time cost spent on restraining the high-part pressure pulsation in the hydraulic design stage is greatly reduced.
Drawings
FIG. 1 is a graph of typical high part load pressure pulsation amplitude;
FIG. 2 is a flow chart of the combined suppression method for the pressure pulsation of the high part load of the water turbine according to the present invention;
FIG. 3 is a schematic view of a stepped elongated water discharge cone structure;
FIG. 4 is a comparison graph before and after draft tube curvature control
FIG. 5 is a schematic cross-sectional view of a draft tube monitoring;
FIG. 6 is a schematic plan projection of the vortex-band shape on three cross-sections;
FIG. 7 is a diagram illustrating parameters associated with an elliptical vortex band.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
As shown in fig. 2, the invention provides a combined suppression method for high part load pressure pulsation of a water turbine, which comprises the following steps:
step S1, acquiring the associated information of the high part load pressure pulsation and the draft tube vortex strip;
and step S2, carrying out step lengthening of the runner drainage cone and draft tube curvature adjustment according to the related information of the high partial load pressure pulsation and the draft tube vortex strip so as to realize the suppression of the high partial load pressure pulsation of the water turbine.
Furthermore, the drain cone is lengthened in a grading way, on one hand, the backflow of the upper crown part is reduced, on the other hand, the frequency of the vortex band is changed, and the generation of the high-part load pressure pulsation phenomenon is restrained through the combined action of the two aspects. As shown in fig. 3, the drain cone is lengthened in two stages, the drain cone at the lengthened section is cylindrical, the length of the first-stage drain cone 2 is controlled to be approximately equal to that of the second-stage drain cone 3, the second-stage drain cone 3 needs to slightly exceed the plane of the lower ring 5 of the runner, on one hand, the flow velocity distribution of the runner outlet 4 is optimized by reducing the backflow of the upper crown 1 part, the formation of the vortex band is reduced, on the other hand, the lengthened drain cone also changes the high-frequency of the movement of the vortex band of the draft tube, the condition of forming resonance is destroyed, and through the combined action of the two aspects, the generation of high-part load pressure pulsation is effectively inhibited.
Further, as shown in fig. 4, the draft tube curvature is adjusted (the draft tube before curvature control is shown by a dotted line, and the draft tube after curvature control is shown by a solid line), the draft tube height is increased, the curvature radius of the elbow section 7 is reduced, so that the draft tube straight-cone section 6 is longer, the longer straight-cone facilitates the downstream development of the vortex band, and the probability of collision between the vortex band and the straight-cone section is reduced, so that the purpose of reducing the high-part load pressure pulsation is achieved.
The combined inhibition method for the high partial load pressure pulsation of the water turbine is provided based on the close connection of the high partial load pressure pulsation, the draft tube vortex band and the water body resonance. Quantitative parameters for representing the revolution and rotation of the vortex band are established based on mathematical decomposition, and the sections 8, 9 and 10 (wherein the distances between the sections 8, 9 and 10 and the central plane of the runner are respectively 0.55D) as shown in FIG. 5 are selected 2 ，1.10D 2 ，1.65D 2 ，D 2 Is the diameter of the outlet edge of the rotating wheel), through obtaining the frequencies of revolution and rotation parameters of the vortex bands with different sections and comparing and analyzing the frequencies with the frequency characteristics of high partial load pressure pulsation of the draft tube on the corresponding different sections, the association between the induction of the high partial load pressure pulsation and the motion of the vortex bands of the draft tube is established, the motion can be decomposed into rotation and revolution, and the common of the high partial load pressure pulsation is inducedThe vibration frequency is about 1.72f n (f n Is a frequency conversion). The method comprises the following specific steps:
as shown in fig. 6, which is a planar projection of the vortex-band shape on the three cross-sections 8, 9, 10 shown in fig. 5, which is approximately elliptical.
As shown in fig. 7, first, the relevant parameters are established, and the geometric center and the radius are defined as:
wherein N is the number of data points, (x) c ,y c ) Is the central coordinate of the ellipse, R c Is the geometric center radius, L a Is the major axis of the ellipse, L b Is an elliptical short shaft, and the short shaft,
is an ellipse equivalent radius; the value of the ellipse long (short) axis is determined by two points where the minimum value and the maximum value of x are located, the corresponding short (long) axis is determined by the ellipse area, and the expression is as follows: l is b ＝S/πL a (ii) a With (x) c ,y c ) As a parameter for characterizing the revolution of the vortex band, the revolution direction is represented by ω and L a 、L b 、
As a parameter for characterizing the rotation of the vortex band, the rotation direction is in ω p And (4) showing. And acquiring data of the parameters on different sections through numerical simulation, and obtaining the frequency of each parameter of the section of the vortex band by using fast Fourier transform.
Monitoring the time domain and frequency domain characteristics of revolution and rotation parameters of the vortex band on different sections by carrying out numerical simulation on the working condition of high-part load pressure pulsation; and carrying out a model test to obtain the pulsation frequency of the high-part load pressure under the corresponding working condition.
By comparing and analyzing the results of the two steps, the following conclusion is obtained: the dominant frequency of the revolution parameter of the vortex band of the draft tube is 0.38f n The frequency is the typical draft tube vortex band frequency. The second main frequency of the revolution of the vortex band is 1.71f n The main frequency of the high-part load pressure pulsation is consistent with the main frequency of the high-part load pressure pulsation obtained by the model test, and the main frequency shows that the induction of the high-part load pressure pulsation is closely connected with the revolution of the vortex band of the draft tube, and the revolution motion frequency of the vortex band is close to the natural frequency of the medium of the water turbine to cause water body resonance, so that the high-amplitude high-part load pressure pulsation is induced.
Example 2:
the invention also provides a combined suppression device for high part load pressure pulsation of a water turbine, which comprises:
the acquisition module is used for acquiring the associated information of the high-part load pressure pulsation and the draft tube vortex band;
and the inhibition module is used for carrying out graded lengthening of the runner drainage cone and adjustment of the curvature of the draft tube according to the correlation information of the high partial load pressure pulsation and the draft tube vortex band so as to realize inhibition of the high partial load pressure pulsation of the water turbine.
As an implementation manner of this embodiment, the obtaining module is configured to obtain frequencies representing revolution and rotation parameters of the vortex strips at different cross sections, and perform comparative analysis on frequency characteristics of the high partial load pressure pulsation of the draft tube corresponding to different cross sections, so as to obtain correlation information between the induction of the high partial load pressure pulsation and the movement of the vortex strips of the draft tube.
As an implementation of this example, the resonant frequency inducing the high part load pressure pulsations is about 1.72f n ，f n Is the frequency conversion.
As an implementation manner of this embodiment, the stepped lengthened runner drain cone specifically includes: the drain cone of the lengthened section is cylindrical, the length of the first-stage drain cone is equal to that of the second-stage drain cone, and the second-stage drain cone exceeds the plane of the lower ring of the rotating wheel; the method for adjusting the curvature of the draft tube specifically comprises the following steps: the height of the draft tube is increased and the radius of curvature of the elbow section is reduced to increase the length of the straight tapered section of the draft tube.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A combined inhibition method for high-part load pressure pulsation of a water turbine is characterized by comprising the following steps:
step S1, acquiring the associated information of the high part load pressure pulsation and the draft tube vortex strip;
and step S2, carrying out step lengthening of the runner drainage cone and draft tube curvature adjustment according to the related information of the high partial load pressure pulsation and the draft tube vortex strip so as to realize the suppression of the high partial load pressure pulsation of the water turbine.
2. The combined suppression method for high part load pressure pulsation of a water turbine according to claim 1, characterized in that in step 1, the frequency of revolution and rotation parameters of vortex bands represented by different cross sections is obtained, and the frequency characteristics of the high part load pressure pulsation of the draft tube corresponding to different cross sections are compared and analyzed to obtain the relevant information of the high part load pressure pulsation and the draft tube vortex bands.
3. The combined high part load pressure pulsation damping method for water turbines of claim 2, wherein the resonance frequency of the high part load pressure pulsation is about 1.72f n ，f n Is the frequency conversion.
4. The combined method for suppressing the pressure pulsation of the water turbine under the high part load of the claim 3, wherein the stepped lengthened runner drain cone is specifically as follows: the runner cone of the lengthened section is cylindrical, the length of the first-stage runner cone is equal to that of the second-stage runner cone, and the second-stage runner cone exceeds the plane of the lower ring of the runner.
5. The combined method for suppressing high part load pressure pulsation of a water turbine according to claim 4, wherein the adjusting of the curvature of the draft tube is specifically: the height of the draft tube is increased and the radius of curvature of the elbow section is reduced to increase the length of the straight tapered section of the draft tube.
6. A combined high part load pressure pulsation suppression device for a water turbine, comprising:
the acquisition module is used for acquiring the association information of the high part load pressure pulsation and the draft tube vortex band;
and the inhibition module is used for carrying out graded lengthening of the runner drainage cone and curvature adjustment of the draft tube according to the correlation information of the high partial load pressure pulsation and the draft tube vortex strip so as to realize inhibition of the high partial load pressure pulsation of the water turbine.
7. The combined high part load pressure pulsation suppression device of the water turbine according to claim 6, wherein the obtaining module is configured to obtain the information related to the high part load pressure pulsation and the draft tube vortex band by obtaining the frequencies of revolution and rotation parameters of the vortex band represented by different cross sections and comparing and analyzing the frequency characteristics of the draft tube high part load pressure pulsation corresponding to different cross sections.
8. The combined high part load pressure pulsation suppression system for water turbines of claim 7, wherein the resonant frequency of the high part load pressure pulsation is about 1.72f n ，f n Is the frequency conversion.
9. The combined high part load pressure pulsation suppression device for water turbines as defined in claim 8, wherein said staged runner discharge cone is embodied as: the drain cone of the lengthened section is cylindrical, the length of the first-stage drain cone is equal to that of the second-stage drain cone, and the second-stage drain cone exceeds the plane of the lower ring of the rotating wheel; the method is characterized in that the curvature of the draft tube is adjusted as follows: the height of the draft tube is increased and the radius of curvature of the elbow section is reduced to increase the length of the straight tapered section of the draft tube.
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| CN202210755159.9A CN114934872A (en) | 2022-06-30 | 2022-06-30 | Method and device for jointly inhibiting pressure pulsation of high-part load of water turbine |
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| CN202210755159.9A CN114934872A (en) | 2022-06-30 | 2022-06-30 | Method and device for jointly inhibiting pressure pulsation of high-part load of water turbine |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB154894A (en) * | 1919-12-04 | 1922-03-13 | Harvey Birchard Taylor | Improvements in hydraulic turbine systems |
| CN106523242A (en) * | 2016-12-07 | 2017-03-22 | 中国水利水电科学研究院 | Method for relieving harms of high partial load pressure pulsation of mixed-flow water turbine |
| CN213598114U (en) * | 2020-11-27 | 2021-07-02 | 西安理工大学 | Hyperbolic type fluting wash-out awl |
-
2022
- 2022-06-30 CN CN202210755159.9A patent/CN114934872A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB154894A (en) * | 1919-12-04 | 1922-03-13 | Harvey Birchard Taylor | Improvements in hydraulic turbine systems |
| CN106523242A (en) * | 2016-12-07 | 2017-03-22 | 中国水利水电科学研究院 | Method for relieving harms of high partial load pressure pulsation of mixed-flow water turbine |
| CN213598114U (en) * | 2020-11-27 | 2021-07-02 | 西安理工大学 | Hyperbolic type fluting wash-out awl |
Non-Patent Citations (4)
| Title |
|---|
| 刘胜柱, 纪兴英: "三峡右岸水轮机水力性能优化设计", 大电机技术, no. 01, pages 30 - 34 * |
| 刘胜柱等: "水轮机", 大电机技术，"三峡右岸水轮机水力性能优化设计", vol. 2004, no. 1, pages 30 - 34 * |
| 李仲全;王军;: "尾水管高度和宽度对水轮机水力性能的影响", 东方电气评论, no. 01, pages 20 - 25 * |
| 李仲全等: "水轮机", 东方电气评论，"尾水管高度和宽度对水轮机水力性能的影响", vol. 20, no. 1, pages 20 - 25 * |
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