CN114483205A - Internal noise reduction structure of steam turbine and steam turbine - Google Patents
Internal noise reduction structure of steam turbine and steam turbine Download PDFInfo
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- CN114483205A CN114483205A CN202111499282.0A CN202111499282A CN114483205A CN 114483205 A CN114483205 A CN 114483205A CN 202111499282 A CN202111499282 A CN 202111499282A CN 114483205 A CN114483205 A CN 114483205A
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- 239000012530 fluid Substances 0.000 abstract description 7
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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
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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
- F01D25/04—Antivibration arrangements
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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
- F01D9/04—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector
- F01D9/041—Nozzles; Nozzle boxes; Stator blades; Guide conduits, e.g. individual nozzles forming ring or sector using blades
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Abstract
The invention provides a turbine internal noise reduction structure and a turbine, wherein the turbine internal noise reduction structure comprises a vent hole, a connecting channel and a cavity; the vent hole is arranged on the flow guide surface of the steam flow guide structure, and the steam flow guide structure is fixedly arranged in the steam turbine; the connecting channel and the cavity are respectively arranged in the steam guide structure; one end of the connecting channel is communicated with the vent hole, and the other end of the connecting channel is communicated with the cavity; under the pulsating action of a flow field in the steam turbine, steam in the cavity is compressed and expanded according to a preset frequency, and the preset frequency is determined by at least one of the aperture of the vent hole, the length of the connecting channel and the volume of the cavity. The invention can dissipate the pulsating energy of the main stream steam with specific frequency based on the periodical compression and expansion of the steam in the cavity, achieves the effect of reducing the flow noise and the fluid pulsation of the specific frequency, and realizes the noise reduction treatment of the noise with the specific frequency generated when the steam turbine operates under the condition of not changing the original through-flow design of the steam turbine.
Description
Technical Field
The invention relates to the technical field of power machinery, in particular to an internal noise reduction structure of a steam turbine and the steam turbine.
Background
The steam turbine (The steam turbine) is a rotary steam power device, when The steam turbine works, high-temperature and high-pressure steam forms accelerated airflow which is sprayed to a moving blade along a specific direction after being guided by each guide channel on a stationary blade grid, so that a rotor provided with The moving blade rotates and does work outwards. The steam turbine is the main equipment of modern heat energy power generation, also widely uses in trades such as industry drive, boats and ships power.
Because the steam flow rate in the steam turbine is high, and the steam turbine rotor rotates to cause the flow field to generate periodic pulsation, obvious vibration noise can be formed, the flow field pulsation can also excite the structural components of the steam turbine, and then the vibration noise of the steam turbine is increased, so that the working environment of a workshop where the steam turbine is located or a ship cabin is severe.
In the related art, through optimization of the design of the steam turbine is adopted to improve the through-flow efficiency of the steam turbine and reduce flow noise and vibration noise caused by fluid pulsation under the condition of stabilizing a flow field as much as possible. However, since there is an upper limit to the improvement of the through-flow efficiency of the steam turbine, the method can only reduce the flow field pulsation amplitude to a certain extent, the noise reduction effect is very limited, and the flow field pulsation with a specific frequency generated by the relative motion of the stationary blade and the movable blade exists in the steam turbine, and the method cannot process the noise peak value with the specific frequency so as to further reduce the flow noise of the steam turbine and the vibration noise caused by the fluid pulsation, and especially, it is very difficult to reduce the noise with the specific frequency.
Disclosure of Invention
The invention provides a turbine internal noise reduction structure and a turbine, which are used for solving or improving the problem that noise with specific frequency generated when the turbine runs is difficult to be subjected to noise reduction treatment under the condition that the original through-flow design of the turbine is not changed at present.
The invention provides a turbine internal noise reduction structure, comprising: the vent hole, the connecting channel and the cavity are formed; the vent hole is arranged on a flow guide surface of the steam flow guide structure, and the steam flow guide structure is fixedly arranged in the steam turbine; the connecting channel and the cavity are respectively arranged in the steam flow guide structure; one end of the connecting channel is communicated with the vent hole, and the other end of the connecting channel is communicated with the cavity; and under the pulsation action of a flow field in the steam turbine, compressing and expanding steam in the cavity according to a preset frequency, wherein the preset frequency is determined by at least one of the aperture of the vent hole, the length of the connecting channel and the volume of the cavity.
According to the internal noise reduction structure of the steam turbine, provided by the invention, a plurality of air holes, a plurality of connecting channels and a plurality of cavities are respectively arranged; the plurality of vent holes are communicated with one ends of the plurality of connecting channels in a one-to-one correspondence manner; the other ends of the plurality of connecting channels are communicated with the plurality of cavities in a one-to-one correspondence manner, or any one of the plurality of cavities is communicated with a plurality of the other ends of the plurality of connecting channels.
According to the internal noise reduction structure of the steam turbine, provided by the invention, a plurality of air holes and a plurality of connecting channels are respectively arranged, and one cavity is arranged; the plurality of vent holes are communicated with one ends of the plurality of connecting channels in a one-to-one correspondence mode, and the other ends of the plurality of connecting channels are communicated with one cavity.
According to the internal noise reduction structure of the steam turbine, provided by the invention, the apertures of at least two of the vent holes are different; and/or the aperture of the vent hole is the same as the inner diameter of the connecting channel; and/or at least two of the plurality of connecting channels have different lengths.
According to the internal noise reduction structure of the steam turbine provided by the invention, the steam guide structure comprises: a stationary blade cascade; the stationary blade cascade includes: a plurality of stationary blades; the plurality of stationary blades are sequentially arranged at intervals along the circumferential direction of the steam turbine, and a steam flow channel is defined between any adjacent two of the plurality of stationary blades; the first side face and the second side face of each static blade are respectively the flow guide face, the first side face of each static blade faces the inflow direction of steam, and the first side face and the second side face are respectively arranged on the opposite sides of the static blades.
According to the internal noise reduction structure of the steam turbine provided by the invention, the steam guide structure further comprises: the first flow guide supporting part and the second flow guide supporting part; the first flow guide supporting part, the stationary blade cascade and the second flow guide supporting part are sequentially connected from inside to outside along the radial direction of the steam turbine; the steam flow channel is defined by the outer side surface of the first flow guide supporting part, the inner side surface of the second flow guide supporting part and the opposite wall surfaces of any two adjacent static blades in the static blade cascade; the outer side surface of the first diversion supporting part and the inner side surface of the second diversion supporting part corresponding to the steam flow channel are the diversion surfaces respectively.
According to the internal noise reduction structure of the steam turbine provided by the invention, the vent hole is selectively arranged on at least one of the first side surface of the static blade, the outer side surface of the first flow guide supporting part and the inner side surface of the second flow guide supporting part; wherein, in a case where the vent hole is provided in the first side surface of the stationary blade, the connection passage and the cavity are respectively provided in the stationary blade; under the condition that the vent hole is arranged on the outer side surface of the first flow guide supporting part, the connecting channel and the cavity are respectively arranged in the first flow guide supporting part; under the condition that the vent hole is arranged on the inner side surface of the second flow guide supporting part, the connecting channel and the cavity are respectively arranged in the second flow guide supporting part.
The invention also provides a steam turbine, which comprises the internal noise reduction structure of the steam turbine.
The invention provides an internal noise reduction structure of a steam turbine and the steam turbine, wherein a steam flow guide structure in the steam turbine is provided with a vent hole, a connecting channel and a cavity, when periodically pulsating main steam in the steam turbine flows through the flow guide surface of the steam flow guide structure, a very small amount of steam can periodically enter and discharge the cavity through the vent hole, and in the process, the steam in the cavity can be periodically compressed and expanded at a preset frequency according to the pulsation frequency of the main steam in the steam turbine, so that the pulsating energy of the main steam at a specific frequency is dissipated, the effect of reducing the flowing noise and the fluid pulsation at the specific frequency is achieved, and the noise reduction treatment of the noise at the specific frequency generated when the steam turbine operates is realized under the condition that the original through-flow design of the steam turbine is not changed.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is one of the schematic structural views of a turbine internal noise reduction structure provided by the present invention;
FIG. 2 is a schematic cross-sectional view of a stationary blade with a vent, a connecting passage and a cavity according to the present invention;
FIG. 3 is a second schematic cross-sectional view of a stationary blade with a vent, a connecting channel and a cavity according to the present invention;
FIG. 4 is a second schematic structural view of the internal noise reduction structure of the steam turbine according to the present invention;
FIG. 5 is a schematic structural view of the vent hole, the connecting channel and the cavity provided in the first flow-guiding support portion;
reference numerals:
1: a first flow guide support part; 2: a stationary blade; 3: a second flow guide support part;
4: a rotation support; 5: moving blades; 11: a vent hole;
12: a connecting channel; 13: a cavity; 100: an outer side surface;
300: an inner side surface; 201: a first side surface; 202: a second side.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present 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.
The following describes a turbine internal noise reduction structure and a turbine according to the present invention with reference to fig. 1 to 5.
As shown in fig. 1 and 4, the present embodiment provides a turbine internal noise reduction structure, including: a vent hole 11, a connecting channel 12 and a cavity 13; the vent holes 11 are arranged on the flow guide surface of the steam flow guide structure, and the steam flow guide structure is fixedly arranged in the steam turbine; the connecting channel 12 and the cavity 13 are respectively arranged in the steam flow guide structure; one end of the connecting channel 12 is communicated with the vent hole 11, and the other end is communicated with the cavity 13; under the pulsating action of the flow field in the steam turbine, the steam in the cavity 13 is compressed and expanded according to a preset frequency, and the preset frequency is determined by at least one of the aperture of the vent hole 11, the length of the connecting channel 12 and the volume of the cavity 13.
Specifically, in the embodiment, the vent holes 11, the connecting channel 12 and the cavity 13 are arranged on the steam guide structure in the steam turbine, when periodically pulsating main steam in the steam turbine flows through the guide surface of the steam guide structure, a very small amount of steam can periodically enter and exit the cavity 13 through the vent holes 11, and in the process, the steam in the cavity 13 can be periodically compressed and expanded at a preset frequency according to the pulsation frequency of the main steam in the steam turbine, so that the pulsation energy of the main steam at a specific frequency is dissipated, the effect of reducing flowing noise and fluid pulsation at the specific frequency is achieved, and noise reduction processing on the noise at the specific frequency generated when the steam turbine operates is achieved under the condition that the original through-flow design of the steam turbine is not changed.
It should be noted that the steam guide structure shown in the present embodiment may be understood as a partial structure for constructing a steam flow passage in a steam turbine, or a structure provided in the steam flow passage for guiding the flow direction of steam. For example, the steam guide structure may be a stationary blade cascade in the steam turbine, an inner wall surface of a casing of the steam turbine, an intake pipe and an exhaust pipe of the steam turbine, and the like, and is not particularly limited herein.
According to the present embodiment, the preset frequency of compression and expansion of the steam in the cavity 13 can be determined comprehensively based on three parameters, namely the aperture of the vent hole 11, the length of the connecting channel 12 and the volume of the cavity 13, according to the actual noise elimination requirement.
Because the pulsation of the main stream in the steam turbine with the specific frequency is generated by the relative motion of the static blade and the movable blade in the steam turbine, according to the pulsation frequency of the main stream in the steam turbine, the preset frequency of the compression and expansion of the steam in the cavity 13 can be made to correspond to the pulsation frequency of the main stream by reasonably selecting the aperture of the vent hole 11, the length of the connecting channel 12 and the volume of the cavity 13, so that the pulsation energy of the steam with the specific frequency is dissipated, and the effect of reducing the operation noise of the steam turbine is achieved.
When steam in cavity 13 compresses, some steam through the water conservancy diversion face of steam water conservancy diversion structure can get into cavity 13 through air vent 11 and connecting channel 12 in proper order, and when the steam in cavity 13 expands, some steam in cavity 13 still loops through connecting channel 12 and air vent 11, get into in the steam runner that steam water conservancy diversion structure is located, thereby advance, the steam volume that goes out air vent 11 offsets each other, and the flow is very little, the operating efficiency to the steam turbine does not have the influence basically, and air vent 11 and cavity 13 make full use of the original structure space of steam turbine, can not exert an influence to the original through-flow design of steam turbine.
Therefore, the noise reduction structure shown in the embodiment can effectively suppress noise with specific frequency generated by main steam in the steam turbine by reasonably configuring the design parameters of the vent holes 11, the connecting channels 12 and the cavity 13, and has the advantages of simple structure, adjustable noise elimination frequency, no need of regulation and control, no influence on the operating efficiency of the steam turbine, convenience in application and the like.
Further, in order to ensure a good sound-deadening effect, the present embodiment may also provide the number of the vent holes 11, the connecting passages 12, and the cavities 13, and a specific communication form.
In one embodiment, the vent holes, the connecting channels and the cavities are respectively provided in a plurality; the plurality of vent holes are respectively communicated with one ends of the plurality of connecting channels in a one-to-one correspondence manner; the other ends of the plurality of connecting channels are respectively communicated with the plurality of cavities in a one-to-one correspondence manner, or any one of the plurality of cavities is communicated with a plurality of the other ends of the plurality of connecting channels.
So, all set up a plurality of circumstances at air vent and cavity, this embodiment not only can realize a plurality of air vents and a plurality of cavity one-to-one intercommunication, also can realize among a plurality of cavities that any all communicates with a plurality of air vents.
In another embodiment, the present embodiment may have a plurality of vent holes and connecting channels, respectively, and one cavity is provided; the plurality of vent holes are respectively communicated with one ends of the plurality of connecting channels in a one-to-one correspondence mode, and the other ends of the plurality of connecting channels are communicated with one cavity. Thus, the present embodiment can realize that a plurality of vent holes are communicated with one cavity at the same time.
It should be noted that, in the present embodiment, the vent holes may be designed to have the same aperture, and at least two of the vent holes may have different apertures; meanwhile, the present embodiment may further include that the aperture of the vent hole is the same as the inner diameter of the connecting channel, the lengths of the plurality of connecting channels are the same, or at least two of the plurality of connecting channels are different.
The vent hole shown in the present embodiment can be understood as a small hole having a small diameter.
As shown in fig. 1 to 3, the steam guide structure of the present embodiment includes: a stationary blade cascade; the stationary blade cascade includes: a plurality of stationary blades 2; the plurality of stationary blades 2 are sequentially arranged at intervals along the circumferential direction of the steam turbine, and a steam flow channel is defined between any adjacent two of the plurality of stationary blades 2; the first side surface 201 and the second side surface 202 of the stationary blade 2 are flow guide surfaces shown in the above embodiments, the first side surface 201 of the stationary blade 2 faces the inflow direction of steam, and the first side surface 201 and the second side surface 202 are respectively disposed on opposite sides of the stationary blade 2.
Further, the steam guiding structure shown in this embodiment further includes: a first diversion supporting part 1 and a second diversion supporting part 3; the first flow guide supporting part 1, the static blade cascade and the second flow guide supporting part 3 are sequentially connected from inside to outside along the radial direction of the steam turbine; the outer side 100 of the first flow guide support part 1 is connected with the inner side ends of a plurality of static blades 2, the outer side ends of the static blades 2 are connected with the inner side 300 of the second flow guide support part 3, and a steam flow channel is defined by the outer side 100 of the first flow guide support part 1, the inner side 300 of the second flow guide support part 3 and the opposite wall surfaces of any two adjacent static blades 2 in the static blade cascade; the outer side surface 100 of the first flow guide supporting part 1 and the inner side surface 300 of the second flow guide supporting part 3 corresponding to the steam flow channel are flow guide surfaces as shown in the above embodiments, respectively.
As shown in fig. 1, based on the above arrangement, after the main steam in the steam turbine flows to the inlet end of each steam flow channel corresponding to the stationary blade cascade, the main steam flows through the first side surface 201 of the stationary blade 2, the outer side surface 100 of the first flow guide support part 1, and the inner side surface 300 of the second flow guide support part 3, and is expanded and accelerated by the flow guide of the steam flow channel, and then flows through the flow channel formed by the moving blade 5 and the end wall of the rotation support part 4 connected to the moving blade 5, thereby realizing the rotation work of the rotor of the steam turbine. When the steam turbine is composed of multiple stages of blades, the main steam alternately flows through the flow channels corresponding to the stationary blades 2 and the moving blades of each stage in sequence, and is finally discharged out of the steam turbine. In fig. 1 and 4, the inflow direction and the outflow direction of the mainstream steam are specifically illustrated in this embodiment.
It should be noted that the first flow guide supporting part 1 and the second flow guide supporting part 3 shown in the present embodiment each extend in the circumferential direction of the steam turbine; the middle part of the first flow guide supporting part 1 is provided with a shaft hole, the shaft hole is rotationally connected with a rotating shaft of a steam turbine, the first flow guide supporting part 1 is fixedly connected with a casing of the steam turbine, and the second flow guide supporting part can be the casing of the steam turbine or an intermediate structure for realizing the fixed connection of the outer side end of the static cascade and the casing; meanwhile, the rotation support portion 4 shown in the present embodiment is connected to the rotating shaft of the steam turbine to rotate along with the rotating shaft.
In a preferred embodiment, since the main steam has a greater pulsation intensity when passing through each steam flow channel defined by the stationary blade cascade, in order to achieve better sound absorption and noise reduction effects, the present embodiment may selectively provide the vent holes 11 on at least one of the first side surface 201 of the stationary blade 2, the outer side surface 100 of the first flow guide support portion 1, and the inner side surface 300 of the second flow guide support portion 3.
Thus, when main steam flows through the steam flow channels corresponding to the first side surface 201 of the stationary blade 2, the outer side surface 100 of the first flow guide supporting part 1 and the inner side surface 300 of the second flow guide supporting part 3, part of steam on the surface of the steam flow channel sequentially passes through the vent holes 11 and the connecting channel 12 to enter the cavity 13, meanwhile, part of steam in the cavity 13 returns to the steam flow channel through the connecting channel 12 and the vent holes 11, and in the process, the steam in the cavity 13 is periodically compressed and expanded at a certain frequency, so that the pulsating energy of the main steam with a specific frequency can be dissipated, and the effect of reducing the operating noise of the steam turbine is achieved. As shown in fig. 1 to 3, in the present embodiment, the vent hole 11 may be configured on the first side surface 201 of the stationary blade 2, and the connecting channel 12 and the cavity 13 may be disposed in the stationary blade 2.
In one embodiment, a plurality of vent holes 11 are formed in the first side surface 201 of the stationary blade 2, the plurality of vent holes 11 are sequentially arranged at intervals along the length direction of the stationary blade 2, and a plurality of connecting channels 12 and a plurality of cavities 13 are formed in the stationary blade 2.
As shown in fig. 2, the present embodiment may communicate the plurality of vent holes 11 with one ends of the plurality of connecting channels 12 in one-to-one correspondence, and communicate the other ends of the plurality of connecting channels 12 with the plurality of cavities 13 in one-to-one correspondence.
As shown in fig. 3, in the present embodiment, the plurality of vent holes 11 may be communicated with one ends of the plurality of connecting channels 12 in a one-to-one correspondence, and any one of the plurality of cavities 13 may be communicated with at least two of the other ends of the plurality of connecting channels 12. The present embodiment specifically illustrates that the two vent holes 11 are communicated with one end of the two connecting channels 12 in a one-to-one correspondence manner, and the other ends of the two connecting channels 12 are simultaneously communicated with one cavity 13.
Of course, the present embodiment may also provide a plurality of vent holes in the first side of the stationary blade, and a plurality of connecting channels and one cavity in the stationary blade. The present embodiment may provide that the cavity extends in the length direction of the stationary blade, as the mechanical strength of the stationary blade allows. In this embodiment, the plurality of vent holes and one end of the plurality of connecting channels are communicated in a one-to-one correspondence manner, and the other ends of the plurality of connecting channels are communicated with one cavity.
As shown in fig. 4, in this embodiment, the vent hole 11 may be disposed on the outer side surface 100 of the first diversion supporting part 1 and/or the inner side surface 300 of the second diversion supporting part 3, and when the vent hole 11 is disposed on the outer side surface 100 of the first diversion supporting part 1, the connecting channel 12 and the cavity 13 shown in this embodiment are respectively disposed in the first diversion supporting part 1; when the vent hole 11 is disposed on the inner side surface 300 of the second flow guide support portion 3, the connecting channel 12 and the cavity 13 are disposed in the second flow guide support portion 3 respectively.
As shown in fig. 4, in the present embodiment, the vent holes 11 are formed on both the outer side surface 100 of the first flow guide supporting portion 1 and the inner side surface 300 of the second flow guide supporting portion 3.
As shown in fig. 5, the present embodiment is provided with a plurality of vent holes 11 on the outer side surface 100 of the first flow guiding supporting portion 1, and accordingly, the present embodiment may be provided with a plurality of connecting channels 12 and a plurality of cavities 13 in the first flow guiding supporting portion 1, and the plurality of vent holes 11 are communicated with one end of the plurality of connecting channels 12 in a one-to-one correspondence manner, and the other end of the plurality of connecting channels 12 is communicated with the plurality of cavities 13 in a one-to-one correspondence manner.
Here, in this embodiment, a plurality of vent holes may be disposed on the outer side surface of the first flow guiding supporting portion, a plurality of connecting channels and a plurality of cavities may be disposed in the first flow guiding supporting portion, the plurality of vent holes and one end of the plurality of connecting channels are communicated in a one-to-one correspondence, and any one of the plurality of cavities is communicated with at least two of the other ends of the plurality of connecting channels.
Of course, in this embodiment, a plurality of vent holes may be further disposed on the outer side surface of the first flow guiding supporting portion, a plurality of connecting channels and a cavity are disposed in the first flow guiding supporting portion, and the cavity extends along the circumferential direction of the first flow guiding supporting portion and is in a circular ring shape. Here, in the present embodiment, the plurality of vent holes are communicated with one ends of the plurality of connecting channels in a one-to-one correspondence, and the other ends of the plurality of connecting channels are communicated with one cavity in a one-to-one correspondence.
As for the arrangement form of the vent holes 11, the connecting channels 12 and the cavities 13 on the second flow guiding support portion 3, the arrangement form of the vent holes 11, the connecting channels 12 and the cavities 13 on the first flow guiding support portion 1 shown in the above embodiments can be adopted, and the description is omitted.
It can be known from the above that, a plurality of air vents are opened through the water conservancy diversion face of each steam runner that each stationary blade bar that mainstream steam pulsation is stronger is limited to this embodiment to communicate air vent and cavity through connecting channel, based on the optimal configuration to the aperture of air vent, the length of connecting channel and the volume of cavity, can make the frequency of compression and the inflation of steam in the cavity reach the preset frequency of user's demand, realize dissipating the pulsation energy of the mainstream steam of specific frequency in the steam turbine, the fluid noise and the fluid pulsation of specific frequency in the runner have been reduced, and then the steam turbine noise of operation has been reduced.
Preferably, the present embodiment further provides a steam turbine, including the internal noise reduction structure of the steam turbine as described in any one of the above.
Specifically, since the steam turbine shown in this embodiment includes the internal noise reduction structure of the steam turbine shown in the above embodiment, the steam turbine shown in this embodiment includes all the technical solutions of the above embodiment, and therefore, at least all the beneficial effects brought by all the technical solutions of the above embodiment are achieved, and details are not repeated here.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A turbine internal noise reduction structure, comprising:
the vent hole, the connecting channel and the cavity are formed;
the vent hole is arranged on a flow guide surface of the steam flow guide structure, and the steam flow guide structure is fixedly arranged in the steam turbine; the connecting channel and the cavity are respectively arranged in the steam flow guide structure; one end of the connecting channel is communicated with the vent hole, and the other end of the connecting channel is communicated with the cavity;
and under the pulsation action of a flow field in the steam turbine, compressing and expanding steam in the cavity according to a preset frequency, wherein the preset frequency is determined by at least one of the aperture of the vent hole, the length of the connecting channel and the volume of the cavity.
2. The internal noise reducing structure of a steam turbine according to claim 1,
a plurality of vent holes, a plurality of connecting channels and a plurality of cavities are respectively arranged; the plurality of vent holes are communicated with one ends of the plurality of connecting channels in a one-to-one correspondence manner; the other ends of the plurality of connecting channels are communicated with the plurality of cavities in a one-to-one correspondence manner, or any one of the plurality of cavities is communicated with a plurality of the other ends of the plurality of connecting channels.
3. The internal noise reduction structure of a steam turbine according to claim 1,
a plurality of vent holes and a plurality of connecting channels are respectively arranged, and one cavity is arranged; the plurality of vent holes are communicated with one ends of the plurality of connecting channels in a one-to-one correspondence mode, and the other ends of the plurality of connecting channels are communicated with one cavity.
4. The internal noise reducing structure of a steam turbine according to claim 3,
the apertures of at least two of the vent holes are different; and/or the aperture of the vent hole is the same as the inner diameter of the connecting channel; and/or at least two of the plurality of connecting channels have different lengths.
5. A turbine internal noise reduction structure according to any of claims 1 to 4, wherein said steam guiding structure comprises: a stationary blade cascade;
the stationary blade cascade includes: a plurality of stationary blades; the plurality of stationary blades are sequentially arranged at intervals along the circumferential direction of the steam turbine, and a steam flow channel is defined between any adjacent two of the plurality of stationary blades; the first side face and the second side face of each static blade are respectively the flow guide face, the first side face of each static blade faces the inflow direction of steam, and the first side face and the second side face are respectively arranged on the opposite sides of the static blades.
6. The internal noise reducing structure of a steam turbine according to claim 5,
the steam guide structure further comprises: the first flow guide supporting part and the second flow guide supporting part;
the first flow guide supporting part, the stationary blade cascade and the second flow guide supporting part are sequentially connected from inside to outside along the radial direction of the steam turbine; the steam flow channel is defined by the outer side surface of the first flow guide supporting part, the inner side surface of the second flow guide supporting part and the opposite wall surfaces of any two adjacent static blades in the static blade cascade; the outer side surface of the first diversion supporting part and the inner side surface of the second diversion supporting part corresponding to the steam flow channel are the diversion surfaces respectively.
7. The internal noise reducing structure of a steam turbine according to claim 6,
the vent hole is selectively arranged on at least one of the first side surface of the stationary blade, the outer side surface of the first flow guide supporting part and the inner side surface of the second flow guide supporting part;
wherein, in a case where the vent hole is provided in the first side surface of the stationary blade, the connection passage and the cavity are respectively provided in the stationary blade; under the condition that the vent hole is arranged on the outer side surface of the first flow guide supporting part, the connecting channel and the cavity are respectively arranged in the first flow guide supporting part; under the condition that the vent hole is arranged on the inner side surface of the second flow guide supporting part, the connecting channel and the cavity are respectively arranged in the second flow guide supporting part.
8. A steam turbine comprising a steam turbine internal noise reduction structure according to any one of claims 1 to 7.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2148732C1 (en) * | 1998-05-05 | 2000-05-10 | Открытое акционерное общество Самарский научно-технический комплекс им. Н.Д. Кузнецова | Turbo-machine stage |
| US20020079158A1 (en) * | 2000-12-21 | 2002-06-27 | Zheji Liu | Acoustic liner and a fluid pressurizing device and method utilizing same |
| CN102182519A (en) * | 2011-03-24 | 2011-09-14 | 西安交通大学 | Self-jet flow secondary flow control structure of turbine stator vane |
| WO2013124282A1 (en) * | 2012-02-22 | 2013-08-29 | Siemens Aktiengesellschaft | Impeller lateral spaces with resonators in radial turbomachines |
| CN112627903A (en) * | 2021-01-08 | 2021-04-09 | 上海海事大学 | Shark gill type blade drag reduction structure for steam turbine |
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2021
- 2021-12-09 CN CN202111499282.0A patent/CN114483205A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2148732C1 (en) * | 1998-05-05 | 2000-05-10 | Открытое акционерное общество Самарский научно-технический комплекс им. Н.Д. Кузнецова | Turbo-machine stage |
| US20020079158A1 (en) * | 2000-12-21 | 2002-06-27 | Zheji Liu | Acoustic liner and a fluid pressurizing device and method utilizing same |
| CN102182519A (en) * | 2011-03-24 | 2011-09-14 | 西安交通大学 | Self-jet flow secondary flow control structure of turbine stator vane |
| WO2013124282A1 (en) * | 2012-02-22 | 2013-08-29 | Siemens Aktiengesellschaft | Impeller lateral spaces with resonators in radial turbomachines |
| CN112627903A (en) * | 2021-01-08 | 2021-04-09 | 上海海事大学 | Shark gill type blade drag reduction structure for steam turbine |
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