CN112253490A - Hydrophone arrangement structure for collecting cavitation noise of blade suction surface and use method thereof - Google Patents
Hydrophone arrangement structure for collecting cavitation noise of blade suction surface and use method thereof Download PDFInfo
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- CN112253490A CN112253490A CN202011366497.0A CN202011366497A CN112253490A CN 112253490 A CN112253490 A CN 112253490A CN 202011366497 A CN202011366497 A CN 202011366497A CN 112253490 A CN112253490 A CN 112253490A
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- hydrophone
- blade
- cavitation
- flow pump
- cavitation noise
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/548—Specially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a hydrophone arrangement structure for collecting cavitation noise of a blade suction surface and a use method thereof, the hydrophone arrangement structure comprises an impeller and a plurality of guide vanes, wherein the impeller is arranged on an axial flow pump, and the impeller is provided with blades, and the hydrophone arrangement structure is characterized in that: the head, the middle and the tail of the inlet edge of each guide vane are respectively fixed with a hydrophone, the probe of each hydrophone faces the direction of the blade, and the hydrophones are used for capturing the law of cavitation noise generated on the suction surface of the blade. According to the invention, the hydrophone is arranged on each guide vane, so that the rule of cavitation noise generated on the suction surface of the vane can be effectively captured, and the research on the cavitation performance of the inner vane of the axial flow pump is facilitated to a certain extent.
Description
Technical Field
The invention relates to a hydrophone arrangement structure for collecting cavitation noise of a suction surface of a blade and a use method thereof, belonging to the field of hydraulic engineering.
Background
The axial flow pump is a typical rotary hydraulic machine, has the characteristics of large flow and low lift, and has wide application in the aspects of farmland irrigation, municipal water supply and drainage, water regulation engineering, circulating water engineering of thermal power plants and nuclear power plants, water spray propulsion and the like. When the liquid flows around the impeller blades of the axial flow pump, the local pressure is most easily reduced and local cavitation occurs. The suction surface of the blade is used as the back surface of the axial flow pump blade, the pressure distribution of the surface of the blade is lower than that of the working surface of the blade, and the pressure value of the inlet side is generally smaller on the whole blade surface, so that the cavitation phenomenon is generally most easily generated in the area. Cavitation is a very harmful phenomenon in hydraulic machines, and the generation of cavitation can cause the reduction of energy performance and safety performance of a water pump, and cause vibration and noise. Based on this, it is necessary to provide a hydrophone arrangement for acquiring cavitation noise at the suction surface of the blade.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a hydrophone arrangement structure for collecting cavitation noise of a blade suction surface and a using method thereof.
The invention aims to realize the following technical scheme, and discloses a hydrophone arrangement structure for collecting cavitation noise of a suction surface of a blade, which comprises an impeller and a plurality of guide vanes, wherein the impeller is arranged on an axial flow pump, and the impeller is provided with the blade, and is characterized in that: the head, the middle and the tail of the inlet edge of each guide vane are respectively fixed with a hydrophone, the probe of each hydrophone faces the direction of the blade, and the hydrophones are used for capturing the law of cavitation noise generated on the suction surface of the blade.
The head, the middle and the tail of the inlet edge of the guide vane are respectively bound with a hydrophone by nylon ropes.
A hydrophone arrangement structure for collecting cavitation noise of a blade suction surface is used, and the hydrophone arrangement structure is characterized in that:
the axial flow pump utilizes the atmospheric pressure on the water surface of the water inlet pool and the pressure difference of the inlet of the axial flow pump to enable water to flow to the inlet of the axial flow pump, the pressure near the inlet of the axial flow pump is very low and is often in a negative pressure state, and the water flow can generate larger pressure drop after entering the axial flow pump, so that the cavitation phenomenon is very easy to occur in the axial flow pump, particularly in an impeller chamber;
a hydrophone at the head of the inlet edge of the guide vane collects cavitation noise generated at the root of the impeller, a hydrophone in the middle of the guide vane collects cavitation noise generated in the middle of the blade, and a hydrophone at the tail of the guide vane collects cavitation noise generated at the outer edge of the impeller;
all hydrophones upload the acquired cavitation noise information to a computer terminal provided with noise test system software, the noise test system software of the computer terminal displays a time domain spectrogram and a frequency spectrogram, and then data analysis is carried out, so that some distribution rules of blade cavitation noise can be obtained.
The noise test system software is NoiseA2.1 noise test system software.
The hydrophone distribution structure is reasonable in structure and convenient to use, and the hydrophone distribution structure for collecting the cavitation noise on the suction surface of the blade is mainly used for capturing the distribution rule of the cavitation noise on the suction surface of the blade. Structurally, a hydrophone is respectively bound with the nylon rope at the head, the middle part and the tail part of the inlet edge of each guide vane, and a hydrophone probe faces the direction of the vane and is used for collecting cavitation noise generated on the suction surface of the vane to form the effect of stereo surround sound, so that the distribution rule of the cavitation noise can be accurately captured.
Has the advantages that:
according to the invention, the hydrophone is arranged on each guide vane, so that the rule of cavitation noise generated on the suction surface of the vane can be effectively captured, and the research on the cavitation performance of the inner vane of the axial flow pump is facilitated to a certain extent.
The hydrophone arrangement structure for collecting the cavitation noise of the suction surface of the blade can capture the distribution rule of the cavitation noise of the blade, and further provides some help for researching the blade cavitation in the axial flow pump. In view of this, a hydrophone arrangement for acquiring cavitation noise at the suction surface of the blade is needed in the industry.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1 impeller, 2 guide vanes and 3 hydrophones.
Detailed Description
The invention is further explained below with reference to the drawings.
The utility model provides a hydrophone arrangement structure for gathering blade suction surface cavitation noise, is including installing impeller 1, a plurality of stator 2 on the axial-flow pump, installs the blade on the impeller 1, and head, middle part and the afterbody on every stator 2's inlet limit all are fixed with a hydrophone 3, and the probe of hydrophone 3 is towards the blade direction, and hydrophone 3 is used for catching the law of the cavitation noise that produces on the blade suction surface. Furthermore, the head, the middle and the tail of the inlet edge of the guide vane 2 are respectively bound with a hydrophone 3 by nylon ropes.
When the axial-flow pump is used, the atmospheric pressure on the water surface of the water inlet pool and the pressure difference of the inlet of the axial-flow pump are utilized by the axial-flow pump to enable water to flow to the inlet of the axial-flow pump, the pressure near the inlet of the axial-flow pump is very low and is often in a negative pressure state, and the water flow can generate a large pressure drop after entering the axial-flow pump, so that the cavitation phenomenon is very easy to occur in the axial-flow pump, particularly in an impeller;
the hydrophone 3 at the head of the inlet side of the guide vane 2 collects cavitation noise generated at the root of the impeller 1, the hydrophone 3 at the middle part of the guide vane 2 collects cavitation noise generated at the middle part of the blade, and the hydrophone 3 at the tail part of the guide vane 2 collects cavitation noise generated at the outer edge of the impeller 1;
all the hydrophones 3 upload the acquired cavitation noise information to a computer terminal provided with noise test system software, the noise test system software of the computer terminal displays a time domain spectrogram and a frequency spectrogram, and then data analysis is carried out, so that some distribution rules of blade cavitation noise can be obtained.
The noise test system software is NoiseA2.1 noise test system software. The invention is suitable for the axial flow pump with guide vanes, and hydrophones are installed according to the arrangement form.
Claims (4)
1. The utility model provides a hydrophone arrangement structure for gathering blade suction surface cavitation noise, is including installing impeller (1), a plurality of stator (2) on the axial-flow pump, installs blade, characterized by on impeller (1): the head, the middle and the tail of the inlet edge of each guide vane (2) are respectively fixed with a hydrophone (3), the probe of each hydrophone (3) faces the direction of the blade, and the hydrophones (3) are used for capturing the law of cavitation noise generated on the suction surface of the blade.
2. A hydrophone arrangement for acquiring cavitation noise at the suction surface of a blade, as recited in claim 1, wherein: the head, the middle and the tail of the inlet edge of the guide vane (2) are respectively bound with a hydrophone (3) by nylon ropes.
3. A method of using a hydrophone arrangement for acquiring cavitation noise at the suction side of a blade, as claimed in any of claims 1-2, wherein:
the axial flow pump utilizes the atmospheric pressure on the water surface of the water inlet pool and the pressure difference of the inlet of the axial flow pump to enable water to flow to the inlet of the axial flow pump, the pressure near the inlet of the axial flow pump is very low and is often in a negative pressure state, and the water flow can generate larger pressure drop after entering the axial flow pump, so that the cavitation phenomenon is very easy to occur in the axial flow pump, particularly in an impeller chamber;
the hydrophone (3) at the head of the inlet side of the guide vane (2) collects cavitation noise generated at the root of the impeller (1), the hydrophone (3) at the middle part of the guide vane (2) collects cavitation noise generated at the middle part of the blade, and the hydrophone (3) at the tail part of the guide vane (2) collects cavitation noise generated at the outer edge of the impeller (1);
all hydrophones (3) upload the acquired cavitation noise information to a computer terminal provided with noise test system software, the noise test system software of the computer terminal displays a time domain spectrogram and a frequency spectrogram, and then data analysis is carried out, so that some distribution rules of blade cavitation noise can be obtained.
4. The method of claim 3, wherein: the noise test system software is NoiseA2.1 noise test system software.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011366497.0A CN112253490A (en) | 2020-11-29 | 2020-11-29 | Hydrophone arrangement structure for collecting cavitation noise of blade suction surface and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011366497.0A CN112253490A (en) | 2020-11-29 | 2020-11-29 | Hydrophone arrangement structure for collecting cavitation noise of blade suction surface and use method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112253490A true CN112253490A (en) | 2021-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011366497.0A Pending CN112253490A (en) | 2020-11-29 | 2020-11-29 | Hydrophone arrangement structure for collecting cavitation noise of blade suction surface and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235138A (en) * | 2021-12-03 | 2022-03-25 | 中国船舶工业集团公司第七0八研究所 | Local noise measuring device of water jet propulsion system |
-
2020
- 2020-11-29 CN CN202011366497.0A patent/CN112253490A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235138A (en) * | 2021-12-03 | 2022-03-25 | 中国船舶工业集团公司第七0八研究所 | Local noise measuring device of water jet propulsion system |
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