CN114016487B - Submerged cavitation nozzle of bottom-sitting type wind power installation platform and design method thereof - Google Patents
Submerged cavitation nozzle of bottom-sitting type wind power installation platform and design method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000009434 installation Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 80
- 230000002093 peripheral effect Effects 0.000 claims abstract description 16
- 238000004364 calculation method Methods 0.000 claims description 17
- 238000004080 punching Methods 0.000 claims description 16
- 238000011010 flushing procedure Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 12
- 239000013535 sea water Substances 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000009991 scouring Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000010802 sludge Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
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- 239000004927 clay Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a submerged cavitation nozzle of a bottom-sitting type wind power installation platform, wherein a nozzle protection cover is connected with one side surface of a pile bottom plate, a cavity is formed between the nozzle protection cover and one side surface of the pile bottom plate, a plurality of submerged cavitation nozzles are uniformly distributed on the peripheral surface of a nozzle shaft sleeve at intervals, the formed whole body is arranged in the cavity and is fixed with the inner wall of the nozzle protection cover, a high-pressure pile-flushing water pipe penetrates from the other side surface of the pile bottom plate to be communicated with an inner ring of the nozzle shaft sleeve, one low-pressure pile-flushing water pipe is respectively arranged at two opposite sides of the high-pressure pile-flushing water pipe at intervals, the low-pressure pile-flushing water pipe penetrates from the other side surface of the pile bottom plate to be communicated with a low-pressure water tank between the nozzle shaft sleeve and the nozzle protection cover, and the submerged cavitation nozzle comprises an inner nozzle and an outer nozzle. And its design method is also disclosed. The invention does not depend on fire fighting water and compressed air for flushing and spraying, the equipment has no requirement on a pile flushing medium, can use local materials to flush the pile by using seawater, can greatly reduce the pile flushing cost and realize better pile flushing effect.
Description
Technical Field
The invention relates to the technical field of ocean engineering, in particular to a submerged cavitation nozzle of a bottom-sitting type wind power installation platform and a design method thereof.
Background
In recent years, with the increasing importance of renewable energy sources at home and abroad, offshore wind power generation projects are increasing, and the requirements on the related technologies of advanced bottom-sitting type mounting platforms are also more urgent; because the mounting platform needs frequent pile pulling and shifting work, the flushing system is needed to spray the pile bottom, so that the soil resistance and the adsorption force of clay at the pile bottom are broken, and the pile pulling of the mounting platform can be carried out more easily. However, the conventional nozzle adopted by the spray-jet system either needs a larger supply pressure to spray the pile leg, and the spray-jet effect is general and the demand on the supply pressure is larger; or compressed air is used for scouring soil on the upper surface and the lower surface of the pile shoe, a vacuum layer at the bottom of the pile shoe is filled, the adsorption force of the soil on the upper part of the pile shoe and around the pile leg is damaged, the scouring effect is ideal, but the cost of the compressed air is high.
According to the bernoulli equation in fluid mechanics, if the pressure of a certain point of the flowing liquid is lower than the saturated vapor pressure, the air originally dissolved in the liquid is separated out, and the liquid itself is vaporized, so that a large amount of bubbles are generated in the liquid. The bubbles can grow in a low-pressure area along with the flowing of the liquid, and when the bubbles enter the high-pressure area, the bubbles can be collapsed under the action of pressure, because the time of the process is extremely short, the liquid around the bubbles is accelerated to impact the centers of the bubbles, the liquid particles collide with each other at high speed to generate local high temperature, and the impact pressure is up to several hundred megapascals, so that the cavitation phenomenon is generated.
In conclusion, due to the obvious scouring effect generated by the cavitation phenomenon, the required scouring and spraying pressure is not high, the requirement on the medium is not high, and the water or the seawater can be adopted, so that the cost can be greatly reduced, and the problem to be solved is how to reasonably utilize the cavitation phenomenon to assist the pile pulling of the bottom-sitting type wind power installation platform.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems, the invention aims to provide the submerged cavitation nozzle of the bottom-sitting type wind power installation platform, which can enhance the flushing effect and reduce the cost. And provides a design method thereof.
The technical scheme is as follows: the utility model provides a sit end formula wind-powered electricity generation mounting platform and submerge cavitation nozzle, including the stake bottom plate, low pressure towards a water pipe, high pressure towards a water pipe, submerge cavitation nozzle, the nozzle axle sleeve, the nozzle safety cover, nozzle safety cover is connected with a stake bottom plate side, constitute a cavity between the two, interval equipartition installs a plurality of submerge cavitation nozzles on the outer peripheral face of nozzle axle sleeve, the whole of constitution is arranged in the cavity and is fixed with the inner wall of nozzle safety cover, high pressure towards a water pipe penetrate to the inner ring intercommunication with the nozzle axle sleeve from stake bottom plate another side, low pressure towards a water pipe is equipped with one in the relative both sides of high pressure towards a water pipe interval respectively, penetrate to the low pressure basin intercommunication between nozzle axle sleeve and the nozzle safety cover from stake bottom plate another side, submerge cavitation nozzle and include the inner nozzle, outer nozzle.
Furthermore, one end of the inner nozzle is protruded outwards, one end of the outer nozzle is recessed inwards, the inner nozzle is in threaded connection with the outer nozzle, the submerged cavitation nozzle is of a cylindrical structure, the convex parts and the concave parts of the inner nozzle and the outer nozzle are opposite at intervals, a confluence groove is formed in the submerged cavitation nozzle, and one end of the inner nozzle is connected with the nozzle shaft sleeve.
Preferably, at least two circulation holes are arranged on the peripheral wall of the outer nozzle at intervals, and the circulation holes are communicated with the low-pressure water tank and the confluence tank.
Preferably, the middle part of the inner nozzle is provided with a through high-pressure water channel, the middle part of the outer nozzle is provided with a through confluence channel, and the high-pressure water channel is coaxially communicated with the confluence channel.
Furthermore, the outer peripheral surface of the nozzle protection cover is provided with water outlet nozzles which are in one-to-one correspondence with the plurality of submerged cavitation nozzles, the high-pressure water channel is communicated with the inner ring of the nozzle shaft sleeve and the confluence groove, and the confluence channel is communicated with the confluence groove and the water outlet nozzles.
Preferably, the water outlet nozzle is a conical through hole.
Furthermore, an external thread is arranged on the outer peripheral surface of one end of the submerged cavitation nozzle, a threaded hole is correspondingly formed in the peripheral wall of the nozzle shaft sleeve, and the submerged cavitation nozzle is in threaded connection with the nozzle shaft sleeve.
Furthermore, the outer contour of the nozzle shaft sleeve is regular octagon, the middle part of each side face of the nozzle shaft sleeve is provided with a submerged cavitation nozzle, a regular octagon inner wall matched with the nozzle shaft sleeve in structure is arranged inside the nozzle protection cover, the bottom edge of the regular octagon inner wall is a convex flanging, and the height of the regular octagon inner wall is equal to that of the nozzle shaft sleeve, so that the nozzle shaft sleeve is compressed between the pile bottom plate and the nozzle protection cover.
A design method of the submerged cavitation nozzle of the bottom-sitting type wind power installation platform comprises the following steps:
(I) the section of the concave surface of the outer nozzle is defined as E 1 ，E 1 Is composed of two axisymmetric elliptic partial curves, and the cross section of the outer convex surface of the inner nozzle is E 2 ，E 2 From the same elliptic curveFormed by combining with an elliptic arc section, and the cross section of the inner wall of the water outlet of the outer nozzle is R 1 ，R 1 The arc is composed of axisymmetric arcs;
(II) section E 1 ，E 2 ，R 1 Curve design calculation:
the method comprises the following steps: the length of the outer nozzle is L 1 The length of the elliptical arc segment of the inner nozzle is L 2 The diameter of the outlet of the arc section of the outer nozzle is d 1 The diameter of the outlet of the elliptical arc section of the outer nozzle is d 2 The diameter of the low-pressure water inlet of the outer nozzle is d 3 The diameter of the inlet of the outer nozzle is d 4 The inlet diameter of the inner nozzle is d 5 The length of the outlet of the arc section is t 1 The length of the thread matching part of the inner nozzle and the outer nozzle is t 2 ；
Step two: for the outer nozzle outlet arc segment R 1 And calculating according to the following formula:
relation of curve radius
The upper semicircular arc calculation formula:
lower semi-circular arc calculation formula
Step three: for the section elliptical arc section E of the outer wall surface of the inner nozzle 2 The formula is as follows:
step four: for the outer wall surface section elliptical arc section E of the outer nozzle 1 Calculating, wherein the upper semi-elliptical arc segment is composed of elliptical arc segments with an inclination angle theta, and the formula is as follows:
for the upper semi-elliptical arc segment calculation, the formula is as follows:
due to the passing point of the elliptic arc
Wherein,
the calculation method of the lower semi-elliptical arc segment is obtained by the same method as follows:
due to the passing point of the elliptic arc
Wherein,
has the advantages that: compared with the prior art, the invention has the advantages that:
(1) The device does not depend on fire fighting water and compressed air for flushing and spraying, has no requirement on a flushing pile medium, can use local materials to flush the pile by using seawater, and can greatly reduce the pile flushing cost.
(2) The huge energy generated by cavitation collapse is used in the pile punching system, so that the supply pressure of high-pressure water can be greatly reduced, and a better pile punching effect is realized.
(3) The design of the conical holes for artificially submerging the cavitation nozzle and the nozzle protection cover is utilized, the target distance for collapse of the cavitation bubbles is increased, the growth stage of the cavitation bubbles is enhanced, the cavitation effect is better, and the cavitation erosion effect is stronger.
(4) The inner wall and the outlet of the outer nozzle and the outer wall of the inner nozzle are designed by utilizing the special elliptic curve section and the special circular arc section, so that the supply pressure of low-pressure water and the loss of cavitation bubbles in the cavitation growth stage are reduced, and the collapse of the cavitation bubbles on the inner wall of the nozzle is reduced, so that the inner wall of the nozzle is damaged.
Drawings
FIG. 1 is a schematic view of a split structure according to the present invention;
FIG. 2 is a schematic view of the assembly structure of the present invention;
FIG. 3 is a layout of pile shoe and pipeline;
FIG. 4 is a schematic view of a nozzle boss configuration;
FIG. 5 is a schematic view of the configuration of the combination of the submerged cavitation nozzle and the nozzle boss;
FIG. 6 is a schematic diagram of a submerged cavitation nozzle;
FIG. 7 is a schematic view of the nozzle guard;
FIG. 8 is a schematic structural view of section B-B of FIG. 6;
FIG. 9 is a schematic view of a calculation of the B-B cross-sectional curve design in FIG. 6;
FIG. 10 is a curve E of the inner wall surface of the section B-B in FIG. 6 1 A schematic diagram of a calculation method;
fig. 11 is a schematic diagram of the working process of the present invention.
Detailed Description
The present invention will be further illustrated with reference to the following figures and specific examples, which are to be understood as merely illustrative and not restrictive of the scope of the invention.
A submerged cavitation nozzle of a bottom-sitting type wind power installation platform is shown in figures 1-7 and comprises a pile bottom plate 1, a low-pressure pile-flushing water pipe 2, a high-pressure pile-flushing water pipe 3, a submerged cavitation nozzle 4, a nozzle shaft sleeve 5 and a nozzle protection cover 6.
The nozzle protection cover 6 is connected with one side face of the pile bottom plate 1, a cavity is formed between the two side faces, a plurality of submerged cavitation nozzles 4 are uniformly arranged on the outer peripheral face of the nozzle shaft sleeve 5 at intervals, the formed whole body is arranged in the cavity and fixed with the inner wall of the nozzle protection cover 6, the outer contour of the nozzle shaft sleeve 5 is a regular octagon, the middle part of each side face is provided with one submerged cavitation nozzle 4, the nozzle protection cover 6 is internally provided with a regular octagon inner wall matched with the nozzle shaft sleeve 5 in structure, the bottom edge of the regular octagon inner wall is a convex flanging, the height of the regular octagon inner wall is equal to that of the nozzle shaft sleeve 5, and the nozzle shaft sleeve 5 is compressed between the pile bottom plate 1 and the nozzle protection cover 6.
The high-pressure pile-punching water pipe 3 penetrates from the other side face of the pile base plate 1 to be communicated with an inner ring of the nozzle shaft sleeve 5, the low-pressure pile-punching water pipe 2 is arranged on two opposite sides of the high-pressure pile-punching water pipe 3 at intervals respectively, the low-pressure pile-punching water pipe penetrates from the other side face of the pile base plate 1 to be communicated with a low-pressure water tank 8 formed between the nozzle shaft sleeve 5 and the nozzle protection cover 7, the submerged cavitation nozzle 4 comprises an inner nozzle 41 and an outer nozzle 42, one end of the inner nozzle 41 protrudes outwards, one end of the outer nozzle 42 is recessed inwards, the inner nozzle 41 is in threaded connection with the outer nozzle 42, the submerged cavitation nozzle 4 is of a cylindrical structure, the convex parts and the concave parts of the submerged cavitation nozzle 4 are opposite at intervals, a confluence groove is formed inside the submerged cavitation nozzle 4, external threads are arranged on the outer peripheral face of one end of the inner nozzle 41, threaded holes are correspondingly formed in the peripheral wall of the nozzle shaft sleeve 5, and the submerged cavitation nozzle 4 is in threaded connection with the nozzle shaft sleeve 5.
The outer peripheral wall of the outer nozzle 42 is provided with at least two circulation holes at intervals, the circulation holes are communicated with the low-pressure water tank 8 and the confluence groove, the middle part of the inner nozzle 41 is provided with a through high-pressure water channel, the middle part of the outer nozzle 42 is provided with a through confluence channel, the high-pressure water channel is coaxially communicated with the confluence channel, the outer peripheral surface of the nozzle protection cover 6 is provided with water outlet nozzles which are in one-to-one correspondence with the submerged cavitation nozzles 4, the high-pressure water channel is communicated with an inner ring of the nozzle shaft sleeve 5 and the confluence groove, the confluence channel is communicated with the confluence groove and the water outlet nozzles, the water outlet nozzles are conical, and the nozzle protection cover 5 has three functions, wherein one of the three functions is used for protecting the submerged cavitation nozzles 4 and the nozzle shaft sleeve 5 from being damaged; secondly, the sludge is prevented from entering the pipeline to cause blockage; thirdly, the erosion target distance is increased through the conical outlet, so that cavitation bubbles can grow further, and the erosion capacity of surrounding sludge can be further enhanced.
The two low-pressure pile-washing water pipes and the high-pressure pile-washing water pipe are respectively supplied with low-pressure water and high-pressure water, wherein the high-pressure water of the high-pressure pile-washing water pipe enters the nozzle shaft sleeve to supply the high-pressure water for the inner nozzle, and the low-pressure water of the low-pressure pile-washing water pipe enters the low-pressure water tank between the nozzle shaft sleeve and the nozzle protection cover to supply the low-pressure water for the outer nozzle.
The design method of the submerged cavitation nozzle of the bottom-seated wind power installation platform, as shown in fig. 8 to 11, comprises the following steps:
(I) the section of the concave surface of the outer nozzle is defined as E 1 ，E 1 Is composed of two axisymmetric elliptic partial curves, and the cross section of the outer convex surface of the inner nozzle is E 2 ，E 2 Is formed by combining different elliptic arc sections of the same elliptic curve, and the cross section of the inner wall of the water outlet of the outer nozzle is R 1 ，R 1 The arc is also formed by axisymmetric arcs;
(II) section E 1 ，E 2 ，R 1 Curve design calculation:
the method comprises the following steps: length of the outer nozzle is L 1 The length of the elliptical arc segment of the inner nozzle is L 2 The diameter of the outlet of the circular arc section of the outer nozzle is d 1 The diameter of the outlet of the elliptical arc section of the outer nozzle is d 2 The diameter of the low-pressure water inlet of the outer nozzle is d 3 The diameter of the inlet of the outer nozzle is d 4 The inlet diameter of the inner nozzle is d 5 The length of the outlet of the arc section is t 1 The length of the thread matching part of the inner nozzle and the outer nozzle is t 2 ；
Step two: for the outer nozzle outlet arc segment R 1 The formula is as follows:
relation of curve radius
Upper semicircular arc calculation formula:
lower semi-circular arc calculation formula
Such a circular arc R 1 The water outlet flow channel of the section structure avoids the nozzle from colliding and collapsing with the nozzle outlet in the bubble growth section, and influences the service life of the nozzle.
Step three: for the section elliptical arc section E of the outer wall surface of the inner nozzle 2 The formula is as follows:
step four: for the outer wall surface section elliptical arc section E of the outer nozzle 1 Calculating, wherein the upper semi-elliptical arc segment is composed of an elliptical arc segment with an inclination angle theta, and the formula is as follows:
for the upper semi-elliptical arc segment calculation, the formula is as follows:
due to the passing point of the elliptic arc
Wherein,
the calculation method of the lower semi-elliptical arc segment is obtained by the same method as follows:
due to the passing point of the elliptic arc
Wherein,
the curve E of the elliptic arc section of the outer wall surface of the inner nozzle 2 Curve E of elliptical section of cross section of inner wall surface of outer nozzle 1 The formed low-pressure water flow channel not only reduces the flow velocity loss of the low-pressure water, but also has a further acceleration effect on the low-pressure water by the low-pressure water contraction acceleration area matched with the two elliptical sections, and reduces the supply pressure of the low-pressure water, thereby reducing the investment of cost.
Referring to fig. 11, which is a schematic diagram of the working process of the present invention, high-pressure water enters the high-pressure water tank 9 through the high-pressure pile-punching water pipe and enters from the inlet of the inner nozzle, and low-pressure water enters the low-pressure water tank 8 through the low-pressure pile-punching water pipe and enters from two orifices on the surface of the outer nozzle. When high-pressure water flows through the inner nozzle to shrink the cross section, the flow velocity is increased, the internal pressure of the fluid is reduced, so that an upstream cavitation zone 10 is generated, and then the fluid and generated micro bubbles enter a high-pressure water shrinkage acceleration zone 11 along with the flow of the fluid, so that the fluid velocity is increased, the internal pressure is further reduced, then the fluid enters an inner nozzle expansion section, and the cavitation bubbles rapidly grow and form in a downstream cavitation zone 12 on the inner wall surface of the inner nozzle, so that the formed high-speed jet and the shearing between low-speed annular water flow accelerated by the outer nozzle through a low-pressure water shrinkage acceleration zone 13 after the bubbles flow out of the inner nozzle, further enable the cavitation bubbles to primarily grow and enhance the erosion capacity of the jet. The jet water is ejected out of a conical outlet of the nozzle protection cover, so that the jet water impacts on sludge to cause cavitation damage, and the scouring effect is achieved.
The magnitude of the jet pressure of the high pressure water pipe in the schematic diagram of fig. 11 is whether the cavitation effect of the submerged cavitation nozzle is achieved. The conditions under which cavitation occurs are generally determined by the cavitation number, where P 1 Is the nozzle upstream pressure, P 2 Is the pressure downstream of the nozzle, P v Is the saturated vapor pressure of water due to P 1 >>P 2 >>P v The simplified equation is as follows:
it is considered that cavitation is generated at a cavitation number of 1 or less, and stable cavitation is inevitably generated at a cavitation number of 0.5 or less. Because the depth of the bottom-sitting type installation platform entering the sea is 50 meters at the deepest, the downstream pressure of the nozzle is about 5 standard atmospheric pressures, namely 0.5Mpa, the stable cavitation effect can be realized as long as the pile punching pressure of high-pressure water is greater than 1Mpa by combining a formula, and the required pressure is lower than the requirement of common water jet for pile punching.
Claims (5)
1. A design method for submerging a cavitation nozzle by a bottom-sitting type wind power installation platform is characterized in that the bottom-sitting type wind power installation platform submerges the cavitation nozzle and comprises a pile bottom plate (1), a low-pressure pile punching water pipe (2), a high-pressure pile punching water pipe (3), a submerging cavitation nozzle (4), a nozzle shaft sleeve (5) and a nozzle protection cover (6), wherein the nozzle protection cover (6) is connected with one side surface of the pile bottom plate (1), a cavity is formed between the pile bottom plate and the low-pressure pile punching water pipe, the plurality of submerging cavitation nozzles (4) are uniformly arranged on the outer peripheral surface of the nozzle shaft sleeve (5) at intervals, the formed whole body is arranged in the cavity and fixed with the inner wall of the nozzle protection cover (6), the high-pressure pile punching water pipe (3) penetrates from the other side surface of the pile bottom plate (1) to be communicated with an inner ring of the nozzle shaft sleeve (5), the low-pressure pile punching water pipe (2) is respectively arranged on the opposite two sides of the high-pressure pile punching water pipe (3) at intervals, the side surface of the pile bottom plate (1) penetrates to be communicated with a low-pressure water trough (8) between the nozzle shaft sleeve (5) and the nozzle protection cover (6), and the submerging cavitation nozzle protection cover (4) at intervals; one end of the inner nozzle (41) protrudes outwards, one end of the outer nozzle (42) is sunken inwards, the inner nozzle (41) is in threaded connection with the outer nozzle (42), the submerged cavitation nozzle (4) is in a cylindrical structure, the convex parts and the concave parts of the submerged cavitation nozzle (4) are opposite at intervals, a confluence groove is formed inside the submerged cavitation nozzle (4), and one end of the inner nozzle (41) is connected with the nozzle shaft sleeve (5); at least two circulation holes are arranged on the peripheral wall of the outer nozzle (42) at intervals, and the circulation holes are communicated with the low-pressure water tank (8) and the confluence groove; the design method is characterized in that the design method comprises the following steps:
(I) the section of the concave surface of the outer nozzle is defined as E 1 ，E 1 Is composed of two axisymmetric elliptic partial curves, and the cross section of the outer convex surface of the inner nozzle is E 2 ，E 2 Is formed by combining different elliptic arc sections of the same elliptic curve, and the cross section of the inner wall of the water outlet of the outer nozzle is R 1 ，R 1 The arc is also formed by axisymmetric arcs;
(II) section E 1 ，E 2 ，R 1 Curve design calculation:
the method comprises the following steps: length of the outer nozzle is L 1 The length of the elliptical arc segment of the inner nozzle is L 2 The diameter of the outlet of the arc section of the outer nozzle is d 1 The diameter of the outlet of the elliptical arc section of the outer nozzle is d 2 The diameter of the low-pressure water inlet of the outer nozzle is d 3 The diameter of the inlet of the outer nozzle is d 4 The inlet diameter of the inner nozzle is d 5 The length of the outlet of the arc section is t 1 The length of the thread matching part of the inner nozzle and the outer nozzle is t 2 ；
Step two: for the outer nozzle outlet arc segment R 1 The formula is as follows:
the upper semicircular arc calculation formula:
lower semicircular arc calculation formula
Step three: for the section elliptical arc section E of the outer wall surface of the inner nozzle 2 The formula is as follows:
step four: for the section elliptical arc section E of the inner wall surface of the outer nozzle 1 Calculating, wherein the upper semi-elliptical arc segment is composed of an elliptical arc segment with an inclination angle theta, and the formula is as follows:
for the upper semi-elliptical arc segment calculation, the formula is as follows:
due to the passing point of the elliptic arc
Wherein,
the calculation method of the lower semi-elliptical arc segment is obtained by the same method as follows:
due to the passing point of the elliptic arc
Wherein,
2. the design method of the submerged cavitation nozzle of the bottom-sitting type wind power installation platform according to claim 1, characterized in that: the outer peripheral surface of the nozzle protection cover (6) is provided with water outlet nozzles which are in one-to-one correspondence with the plurality of submerged cavitation nozzles (4), the high-pressure water channel is communicated with the inner ring of the nozzle shaft sleeve (5) and the confluence groove, and the confluence channel is communicated with the confluence groove and the water outlet nozzles.
3. The design method of the submerged cavitation nozzle of the bottom-sitting type wind power installation platform according to claim 2, characterized in that: the water outlet nozzle is a conical through hole.
4. The design method of the submerged cavitation nozzle of the bottom-supported wind power installation platform according to claim 1, characterized in that: the outer peripheral surface of one end of the submerged cavitation nozzle (4) is provided with external threads, the peripheral wall of the nozzle shaft sleeve (5) is correspondingly provided with threaded holes, and the submerged cavitation nozzle (4) is in threaded connection with the nozzle shaft sleeve (5).
5. The design method of the submerged cavitation nozzle of the bottom-sitting type wind power installation platform according to claim 1, characterized in that: the outer contour of the nozzle shaft sleeve (5) is regular octagon, the middle part of each side face of the nozzle shaft sleeve is provided with a submerged cavitation nozzle (4), a regular octagon inner wall matched with the structure of the nozzle shaft sleeve (5) is arranged inside the nozzle protection cover (6), the bottom edge of the regular octagon inner wall is a convex flanging, the height of the regular octagon inner wall is equal to that of the nozzle shaft sleeve (5), and the nozzle shaft sleeve (5) is compressed between the pile bottom plate (1) and the nozzle protection cover (6).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111384100.5A CN114016487B (en) | 2021-11-16 | 2021-11-16 | Submerged cavitation nozzle of bottom-sitting type wind power installation platform and design method thereof |
| PCT/CN2022/081711 WO2023087585A1 (en) | 2021-11-16 | 2022-03-18 | Bottom-supported wind power mounting platform submerged cavitation nozzles and design method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111384100.5A CN114016487B (en) | 2021-11-16 | 2021-11-16 | Submerged cavitation nozzle of bottom-sitting type wind power installation platform and design method thereof |
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| GB2078546A (en) * | 1980-06-19 | 1982-01-13 | British Hydromechanics | Apparatus for Cleaning Underwater Structures |
| GB8511122D0 (en) * | 1985-05-01 | 1985-06-12 | Wildon K | Discharging particulate material |
| EP2998037B1 (en) * | 2014-09-19 | 2017-03-08 | BAUER Spezialtiefbau GmbH | Cleaning device for cleaning a base of a borehole and method for creating a foundation element |
| CN105234019B (en) * | 2015-08-31 | 2017-07-11 | 浙江大学 | Self adaptation underwater cavitating jet nozzle waterborne |
| CN107558462B (en) * | 2017-09-15 | 2020-07-24 | 天海融合防务装备技术股份有限公司 | Install in towards stake structure on self-elevating platform pile shoe surface |
| US10619321B2 (en) * | 2018-02-28 | 2020-04-14 | White Construction, Inc. | Apparatus, system, and method for cleaning and maintaining piles |
| CN108296040B (en) * | 2018-03-06 | 2020-10-13 | 中国人民解放军陆军装甲兵学院 | Artificial submerged hydrodynamic cavitation nozzle |
| CN109371950B (en) * | 2018-11-19 | 2020-06-09 | 江苏科技大学 | Pile shoe for pile washing of self-elevating platform and washing method |
| CN111046569B (en) * | 2019-12-18 | 2023-09-19 | 苏州热工研究院有限公司 | Cavitation water jet nozzle structure design method |
| CN113070820A (en) * | 2021-05-20 | 2021-07-06 | 安徽理工大学 | Cavitation water jet rust cleaning device |
| CN113536507A (en) * | 2021-07-28 | 2021-10-22 | 南京工业职业技术大学 | Jet pump design method based on theoretical model and CFD correction |
| CN114016487B (en) * | 2021-11-16 | 2022-10-21 | 江苏科技大学 | Submerged cavitation nozzle of bottom-sitting type wind power installation platform and design method thereof |
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| WO2023087585A1 (en) | 2023-05-25 |
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