CN114776390A - Final-stage stationary blade dehumidification structure based on ultrasonic waves - Google Patents
Final-stage stationary blade dehumidification structure based on ultrasonic waves Download PDFInfo
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- CN114776390A CN114776390A CN202210423163.5A CN202210423163A CN114776390A CN 114776390 A CN114776390 A CN 114776390A CN 202210423163 A CN202210423163 A CN 202210423163A CN 114776390 A CN114776390 A CN 114776390A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D9/00—Stators
- F01D9/02—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/007—Preventing corrosion
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Abstract
The invention discloses a final-stage stationary blade dehumidification structure based on ultrasonic waves, which comprises a hollow stationary blade, an ultrasonic sound production device, a tail edge channel and a vibrating rod structure, wherein the ultrasonic sound production device comprises a piezoelectric ultrasonic transducer, a supporting device, a fixed flange and an amplitude transformer. The composite amplitude transformer system formed by the amplitude transformer and the vibrating rod can focus high-energy ultrasonic waves at the position of the tail edge by combining the geometric characteristics of the blade outlet and the propagation performance of the ultrasonic waves. The liquid film at the tail edge of the blade is rapidly broken and atomized under the action of high-energy ultrasonic waves, and the water erosion harm of secondary water drops can be radically treated under the condition of ultrahigh atomization rate. Meanwhile, under different working conditions, different operating conditions can be adapted by adjusting the input power, and the dehumidification efficiency is always maintained at a high level. The invention combines the ultrasonic water drop eliminating technology with the last-stage blade, greatly improves the dehumidification effect of the last-stage blade of the saturated steam turbine, and has guiding significance for the improvement of the blade dehumidification technology and the combined application of the traditional dehumidification structure and other technologies.
Description
Technical Field
The invention belongs to the technical field of steam turbine machinery, and relates to a final stage stationary blade dehumidification structure based on ultrasonic waves.
Background
The last stage blades of a saturated steam turbine operate substantially in the wet steam region. The wet steam can cause the water erosion damage of the last stage of moving blades, thereby not only reducing the working efficiency of the operation of the steam turbine, but also even threatening the safety of the operation of the unit. With the rapid increase of the maximum power of a single machine of a steam turbine and the development of a nuclear steam turbine, the problem of water erosion of the last stage of moving blades of the low pressure of the steam turbine is more and more serious. The wet steam is composed of primary water drops and a small amount of secondary water drops, wherein the secondary water drops have larger grain sizes, generally more than ten times of the grain sizes of the primary water drops, have poor following performance with the main steam flow, can generate dynamic unbalance force, and is considered to be a main cause of blade water erosion. The liquid drops are deposited on the blade to form a water film, the thickness of the water film is increased along with the continuous fusion of the water drops, the water film is gradually accumulated to the tail end of the blade to be torn along with the action of the air flow, and then the water film is separated from the blade to form secondary water drops which are harmful to equipment.
In order to weaken or prevent the water erosion phenomenon, the main technical means at present are to provide a dehumidification groove on a stationary blade by a suction method, provide a moisture collection cavity on a partition plate, provide a diversion groove on a movable blade, prevent a water erosion process and the like.
The stationary blade dehumidification technology has the following three methods: a vane suction method, a vane heating method, and a vane purge method. The stationary blade suction method is the earliest method for dehumidifying hollow guide blades, and the dehumidifying principle is as follows: a wet removing groove is formed in the surface of the stationary blade, and a water film is passively sucked by utilizing the flow field pressure difference. Based on the principle, the technology has the following problems: water films are generated in series flow due to the pressure difference between the pressure surface and the suction surface, so that the dehumidification efficiency is low; the dehumidification groove is generally close to the middle front part of the blade, the particle size of liquid drops impacting the blade is small, the surface tension is large, the small liquid drops are difficult to suck due to pressure difference, and the dehumidification effect is not ideal; the dehumidification effect is different for different structures and operating conditions, such as grooving size, suction pressure flow, grooving position and the like, and the dehumidification effect is not ideal under variable working conditions for large units needing peak shaving. The stator blade heating method is to introduce heat into the cavity of stator blade to heat the inner wall and evaporate the outer surface water film layer to avoid secondary large water drop in the tail edge. In practical applications, how much heat is introduced is considered, and the method needs to change the structure of the equipment, which may cause insufficient dehumidification effect due to insufficient heat. The method for purging the stationary blade comprises the steps of processing a purging slit at the trailing edge of the stationary blade, introducing high-pressure steam into the guide blade, and then spraying the steam from the purging slit at the trailing edge. The method reduces the size of large water drops falling off from the tail edge, accelerates the speed and reduces the erosion of the movable blade. The method needs reasonable matching of the purge steam quantity and the direction angle so as not to influence the main steam flow. When the load changes, the blowing angle is difficult to change, thereby causing the increase of pneumatic loss. Meanwhile, the method breaks up secondary water drops on the suction surface, and the deposition of the liquid drops on the suction surface is more obvious.
The conventional dehumidification method combined with the above has a limited effect of preventing the water erosion of the blade. Compared with the conventional air cooling technology, the ultrasonic wave has high power and large energy. The inherent characteristics of the ultrasonic wave which has strong penetrating power and generates cavitation shock wave when propagating in the medium enable the ultrasonic wave to transmit strong energy when propagating in the medium, thereby generating strong impact and having high efficiency. Utilize the mechanical stirring effect of ultrasonic wave, can act on the blade trailing edge, make the quick broken atomizing of trailing edge liquid film, greatly reduced the harm of secondary water droplet.
Disclosure of Invention
The invention aims to overcome the defect of the traditional blade dehumidification effect, and provides an ultrasonic-based final stage stationary blade dehumidification structure by utilizing the structural characteristics of blades and the cavitation effect of ultrasonic waves. The invention utilizes the geometrical structure characteristics of the blade outlet to form a novel composite amplitude transformer system through the structures of the piezoelectric ultrasonic transducer, the amplitude transformer and the vibrating rod. The vibrating rod is mechanically vibrated under the excitation action of ultrasonic waves, and a liquid film on the surface of the blade is atomized due to the cavitation action to form uniform small-particle-size liquid drop spray, so that the harmfulness of secondary water drops is greatly reduced, and the occurrence of water erosion is effectively prevented.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
an ultrasonic wave based last stage stationary blade dehumidifying structure comprising:
the ultrasonic sound-producing device is arranged in the inner cavity of the hollow stationary blade of the steam turbine;
and the vibrating bar structure is arranged at the tail edge outlet of the hollow stationary blade of the steam turbine and is connected with the ultrasonic sound production device.
The invention further improves the following steps:
the ultrasonic sound production device is provided with a plurality of groups which are distributed along the blade height of the hollow stationary blade of the steam turbine.
The ultrasonic sound generating device comprises a piezoelectric ultrasonic transducer and an amplitude transformer, wherein the piezoelectric ultrasonic transducer is connected with one end of the amplitude transformer into a whole through a fixed flange; the fixed flange is arranged inside the hollow stationary blade of the steam turbine through a supporting device; one section of the amplitude transformer is connected with the vibrating rod structure.
And a through hole is formed in the tail edge of the hollow stationary blade of the steam turbine, and the amplitude transformer penetrates out of the through hole and is connected with the vibrating rod structure.
The amplitude transformer is a rod-shaped structure designed by adopting an exponential amplitude transformer theory.
The diameter of the amplitude transformer is gradually reduced from one side connected with the fixed flange to one side connected with the vibrating rod structure, and the end with the small diameter is welded with the contact section of the vibrating rod structure through rounding.
The piezoelectric ultrasonic transducer is connected with an external power supply through an amplifier, and the piezoelectric ultrasonic transducer can generate ultrasonic waves of 40-60 kHz.
The outer surface of the vibrating rod structure is a structure obtained after rough processing treatment.
The shape of the outer surface of the vibrating rod structure is consistent with the molded line at the outlet of the tail edge of the hollow stationary blade of the steam turbine.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts a final stage stationary blade dehumidification structure based on ultrasonic waves, and can be combined with the existing structure that a final stage blade is provided with a collection or suction slit and the like, thereby obviously improving the dehumidification effect of the final stage blade. Compared with the conventional dehumidification structure, the tail edge of the last-stage blade is a place where secondary water drops are generated, the space of the tail edge is limited, and the traditional dehumidification structure cannot be arranged on the tail edge. The invention introduces the technologies of ultrasonic wave and the like, directly eliminates the secondary water drops in the production process, has small power consumption of the miniature ultrasonic device, has the characteristics of short atomization time and high atomization rate of 95 percent, ensures that the atomized liquid drops have small particle size, uniform distribution and the like, and simultaneously ensures that the part of working medium can enter the main stream to do work again. Under different working conditions, the dehumidifying effect of the suction slits can be changed due to the pressure difference and the main deposition position of the liquid film, and the dehumidifying device can adapt to different working conditions by changing the input power, so that the dehumidifying efficiency is always maintained at a high level. Meanwhile, the secondary water drop crushing effect on the suction surface and the pressure surface of the blade is obvious, and the phenomenon of liquid drop deposition on the suction surface by the method of the static blade blowing method is avoided.
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Drawings
In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a final stage stationary blade ultrasonic dehumidification configuration of the present invention;
FIG. 2 is a schematic view of a single ultrasonic sound generator and vibratory rod according to the present invention;
1-a hollow stationary blade of a steam turbine; 2-an ultrasonic sound generating device; 3-trailing edge channel; 4-vibrating rod structure; 5-a piezoelectric ultrasonic transducer; 6-a support device; 7-fixing a flange; 8-a horn.
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.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be broadly construed and interpreted as including, for example, fixed connections, detachable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the embodiment of the invention discloses a final-stage stationary blade dehumidification structure based on ultrasonic waves, which comprises a hollow stationary blade 1 of a steam turbine, an ultrasonic sound production device 2, a tail edge channel 3 and a vibrating rod structure 4; as shown in fig. 2, the ultrasonic sound generating device 2 includes a piezoelectric ultrasonic transducer 5, a supporting device 6, a fixed flange 7, and a horn 8.
The ultrasonic sound production devices 2 are distributed along the blade height and are arranged in the inner cavity of the hollow stationary blade 1 of the steam turbine, and the shape of the outer surface of the vibrating rod structure 4 is consistent with the molded line of the tail edge outlet. The piezoelectric ultrasonic transducer 5 and the amplitude transformer 8 are connected into a whole by the fixing flange 7, so that the assembly error is reduced. Meanwhile, the supporting device 6 is connected with the fixed flange 7 and the inner wall of the hollow stationary blade 1 of the steam turbine, plays a role in fixing and supporting and cannot generate leakage waves. The tail edge of the hollow stator blade 1 of the steam turbine is provided with a hole, the amplitude transformer 8 penetrates through the tail edge channel 3 to be connected with the vibrating rod structure 4, and the vibrating rod structure 4 is fixed on the blade through a small contact surface. The outer surface of the vibrating rod structure 4 is subjected to rough machining treatment. The amplitude transformer 8 is obtained by adopting the design of an exponential amplitude transformer theory, and has a better energy gathering effect. The amplitude transformer 8 and the vibrating rod structure 4 are combined into a complex amplitude transformer device. The contact section of the small-diameter end of the amplitude transformer 8 and the vibrating rod structure 4 is in radius welding, stress concentration is avoided, and the ultrasonic vibration exciter has good ultrasonic conduction capacity and small acoustic resistance. In order to ensure the crushing effect, the piezoelectric ultrasonic transducer 5 can provide ultrasonic waves of 40-60 kHz. After the installation is finished, the harmonic response analysis is carried out on the complex vibration system formed by each ultrasonic sound production device 2 and the steam turbine hollow stationary blade 1, and the optimal debugging frequency is obtained. Under the working condition, ultrasonic waves pass through a composite amplitude transformer system consisting of the amplitude transformer 8 and the hollow stationary blades 1 of the steam turbine, and a large amount of energy is gathered at the tail edge. The liquid film at the tail edge of the hollow stationary blade 1 of the steam turbine is rapidly broken and atomized under the action of sound waves, works along with the main flow, and reduces the drainage loss and the water erosion to the movable blade. Meanwhile, when the operating condition of the steam turbine changes, the input power of an external power supply is adjusted in time, so that the structure is always kept in a high-efficiency dehumidification state.
The principle of the invention is as follows:
in the wet steam turbine, the wet steam is composed of primary water droplets and a small amount of secondary water droplets, wherein the secondary water droplets are large in particle size, poor in followability with the main stream steam, and generate dynamic unbalance force, which is a main cause of water erosion of the blades. The secondary wet steam drops are mainly generated by tearing the liquid film at the tail edge of the blade by the main stream. According to experimental research on measurement of secondary water drops of wet steam of a 330MW low-pressure turbine, when the average particle size of the secondary water drops is about 100 mu m, the average speed of the secondary water drops is 50 m/s; when the average particle size of the secondary droplets is about 145 μm, the average velocity is 20 m/s. The smaller the average particle size of the secondary water drops, the larger the average velocity, the better the followability with the main flow, and the smaller the impact on the movable blade, the smaller the water erosion damage. The thickness of the liquid film at the trailing edge of the blade is smaller and far lower than the critical thickness of the liquid film entering the crushing oscillation. Under the action of ultrasonic oscillation, the surface with the extremely small liquid film thickness can rapidly enter the crushing atomizer under the ultrasonic excitation to be rapidly atomized. Meanwhile, according to a traditional sound wave atomization particle size diameter prediction formula and related similar experimental data, the secondary liquid drops generated at the tail edge of the last-stage blade can be rapidly atomized under the excitation of ultrasonic waves with certain power, the atomization rate can reach more than 95%, micro jet with the average particle size smaller than 10 mu m is formed, and the hazard of the secondary liquid drops is greatly reduced.
The blade trailing edge is often a relatively thin wedge-shaped geometry, and the vibrating rod structure 4 needs to be consistent with the profile of the blade trailing edge in order to ensure that the aerodynamic characteristics of the main flow are not affected, and also basically presents a wedge-like structure. The wedge-shaped structure has an energy gathering effect on ultrasonic waves. Therefore, in combination with the geometrical characteristics of the blade outlet and the propagation performance of the ultrasonic wave, the horn 8 and the vibrating rod structure 4 form a novel composite horn 8 system which can focus high-energy ultrasonic waves on the trailing edge of the blade. The liquid film at the tail edge of the blade is rapidly broken and atomized under the action of high-energy ultrasonic waves, and the water erosion harm of secondary water drops can be radically treated theoretically under the condition of ultrahigh atomization rate.
Ultrasonic break-up of droplets relies mainly on cavitation by ultrasonic waves. Ultrasonic cavitation refers to the dynamic process of growth and collapse when micro-gas core cavitation bubbles in liquid vibrate under the action of sound waves and sound pressure reaches a certain value. Ultrasonic waves can generate a large number of small bubbles when applied to a liquid. One reason is that a tensile stress locally occurs in the liquid to form a negative pressure, and the reduction in pressure supersaturates the gas originally dissolved in the liquid to escape from the liquid as small bubbles. Another reason is that strong tensile stresses "tear" the liquid into a void, called cavitation. The sound field factors that affect acoustic cavitation are frequency and sound intensity. As the ultrasound frequency increases, the cavitation process is more difficult to occur. And as the frequency increases, the attenuation of the acoustic wave during propagation increases. High frequency ultrasound requires greater energy expenditure to achieve the same sonochemical effect. Therefore, the ultrasonic frequency for the sonochemical reaction is selected from 20-50 kHz. The sound intensity is above the acoustic cavitation threshold value, the sound intensity is improved, the sonochemical reaction yield is increased, however, when the sound intensity exceeds a certain limit, the cavitation bubbles may grow too much in the expansion phase of the sound waves, so that the cavitation bubbles cannot collapse in time in the compression phase of the sound waves, and the cavitation effect is weakened.
Under the action of ultrasonic oscillation, a single liquid drop can go through a dynamic deformation period and a broken atomization area, and the dynamic deformation area consumes more sound energy. The first stage is the dynamic deformation period of the liquid drop, the liquid drop leaves the balance position due to the ultrasonic oscillation action of the bottom, and the liquid drop is stretched, deformed and spread into a liquid film; the second stage is the crushing and atomizing period of the liquid drop, when the liquid drop deforms, the liquid film spreads and the ultrasonic energy inside the liquid drop reaches a critical state, the surface of the liquid drop begins to be peeled off and crushed, and finally the liquid drop is completely atomized. The surface with extremely small liquid film thickness can rapidly enter the crushing atomizer under ultrasonic excitation to be rapidly atomized. According to the literature, under the action of ultrasonic oscillation, the sample liquid drops are atomized after the pinch-off effect, and the atomized particle size distribution is mainly concentrated on about 1 μm.
The ultrasonic atomization has the advantages of small atomized liquid drop particle size, uniform distribution and easy control, and is a good atomization technology. The ultrasonic water drop eliminating technology is combined with the last-stage blade, the dehumidifying effect of the last-stage blade of the saturated steam turbine is greatly improved, and the ultrasonic water drop eliminating technology has guiding significance for the improvement of the blade dehumidifying technology and the combined application of a traditional dehumidifying structure and other technologies.
The invention relates to a final-stage stationary blade dehumidification structure based on ultrasonic waves, which comprises a hollow stationary blade 1 of a steam turbine, an external power supply, an amplifier, a piezoelectric ultrasonic transducer 5, a fixed flange 7, a supporting device 6, an amplitude transformer 8 and a vibrating rod structure 4 with the outer surface subjected to rough treatment. The arrangement of the ultrasonic sound generating device 2 needs to be consistent with the trailing edge profile as much as possible. When the steam turbine operates, the piezoelectric ultrasonic transducer 5 generates ultrasonic waves under the action of an external power supply, the external power supply generates high-frequency current through the amplifier, the piezoelectric ultrasonic transducer 5 vibrates under the action of the high-frequency current to generate ultrasonic waves, the ultrasonic waves are transmitted to the vibrating rod structure 4 at the tail edge of the blade through the amplification structures such as the amplitude transformer 8, the cavitation effect of the ultrasonic waves at the tail edge can break a liquid film at the tail edge of the blade to reduce the generation of secondary liquid drops, and therefore the dehumidification effect on the blade is achieved. The ultrasonic waves have oscillation effect on the liquid film at the tail edge, so that the liquid film at the tail edge is broken, the generation of secondary water drops is greatly reduced, and water erosion is prevented. Meanwhile, according to the humidity distribution of the blades under different working conditions, the proper input power is adjusted to enable the blades to be dehumidified efficiently all the time. The ultrasonic sound generating devices 2 are not limited to four in the present invention, and may be smaller or larger than four.
The invention utilizes the miniature ultrasonic sound production devices 2 to be largely arranged along the blade height direction, is positioned in the hollow stator blade 1 of the steam turbine, can adjust the size and the shape according to the blade profile, and is arranged at the position close to the tail edge of the last stage stator blade. The device can adapt to the characteristics of the last variable cross-section blades of different turbines, and can ensure the dehumidification effect of the tail edge of each cross-section blade to the greatest extent by adjusting the device. The ultrasonic sound production device 2 is fixed in the cavity inside the hollow stationary blade 1 of the steam turbine through a support device 6. The invention carries out certain rough treatment on the vibrating rod structure 4 based on an ultrasonic cavitation mechanism, provides enough cavitation nuclei for the ultrasonic wave to act on the liquid film and aggravates the cavitation of the liquid film.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. An ultrasonic-based last stage stationary blade dehumidification structure, comprising:
the ultrasonic sound-producing device (2), the ultrasonic sound-producing device (2) is arranged in the inner cavity of the hollow stationary blade (1) of the steam turbine;
the vibrating bar structure (4), the vibrating bar structure (4) sets up the trailing edge exit at hollow stator blade (1) of steam turbine to link to each other in ultrasonic sound generating mechanism (2).
2. The last stage stationary blade dehumidification based on ultrasonic waves of claim 1, characterized in that said ultrasonic sound emitting means (2) are provided in several groups, all distributed along the height of the hollow stationary blade (1) of the steam turbine.
3. The last stage stationary blade dehumidification based on ultrasonic wave of claim 1 or 2, characterized in that the ultrasonic sound generating device (2) comprises a piezoelectric ultrasonic transducer (5) and a horn (8), the piezoelectric ultrasonic transducer (5) is connected with one end of the horn (8) into a whole through a fixed flange (7); the fixed flange (7) is arranged inside the hollow stationary blade (1) of the steam turbine through the supporting device (6); one section of the amplitude transformer (8) is connected with the vibrating rod structure (4).
4. The last stage stationary blade dehumidification structure based on ultrasonic wave of claim 3, wherein the hollow stationary blade (1) of the steam turbine is provided with a through hole at its trailing edge, from which the horn (8) is extended to connect with the vibrating rod structure (4).
5. An ultrasonic-based last stage stationary blade dehumidifying structure as claimed in claim 3, wherein the horn (8) is a rod-like structure designed using an exponential horn theory.
6. The last stage ultrasonic-based stationary blade dehumidification structure according to claim 3, wherein the horn (8) has a diameter that gradually decreases from a side connected to the fixed flange (7) to a side connected to the vibratory rod structure (4), and a contact section of the small-diameter end with the vibratory rod structure (4) is welded by rounding.
7. The last-stage stationary blade dehumidification structure based on ultrasonic waves as set forth in claim 3, wherein the piezoelectric ultrasonic transducer (5) is connected to an external power source through an amplifier, and the piezoelectric ultrasonic transducer (5) is an ultrasonic transducer capable of generating ultrasonic waves of 40-60 kHz.
8. The last stage stationary blade dehumidification based on ultrasonic wave of claim 1, characterized in that the external surface of said vibrating rod structure (4) is a roughened structure.
9. The ultrasonic-based last stage stationary blade dehumidifying structure of claim 1, wherein the shape of the outer surface of the vibratory rod structure (4) conforms to the profile at the trailing edge outlet of the steam turbine hollow stationary blade (1).
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