CN115166293A - Helium bubble tracer particle generating device with single nozzle - Google Patents
Helium bubble tracer particle generating device with single nozzle Download PDFInfo
- Publication number
- CN115166293A CN115166293A CN202211086996.3A CN202211086996A CN115166293A CN 115166293 A CN115166293 A CN 115166293A CN 202211086996 A CN202211086996 A CN 202211086996A CN 115166293 A CN115166293 A CN 115166293A
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- needle
- helium
- source
- nozzle
- foaming liquid
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- 239000001307 helium Substances 0.000 title claims abstract description 73
- 229910052734 helium Inorganic materials 0.000 title claims abstract description 73
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 239000002245 particle Substances 0.000 title claims abstract description 43
- 239000000700 radioactive tracer Substances 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 62
- 238000005187 foaming Methods 0.000 claims abstract description 60
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 7
- 238000005259 measurement Methods 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 6
- 238000000917 particle-image velocimetry Methods 0.000 description 10
- 238000005286 illumination Methods 0.000 description 5
- 241000755266 Kathetostoma giganteum Species 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004599 local-density approximation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/20—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using particles entrained by a fluid stream
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
Abstract
The invention relates to the field of PIV velocity field measurement, and particularly discloses a helium bubble tracer particle generating device with a single nozzle, which comprises a nozzle, an air source, a helium source and a foaming liquid source, wherein a coaxially nested fluid medium flow passage is arranged in the nozzle, the fluid medium flow passages are respectively a helium flow passage, an air flow passage and a foaming liquid flow passage, the helium source is connected with the helium flow passage in the nozzle, the air source is connected with the air flow passage in the nozzle, the air source is connected with an inlet of the foaming liquid source, and an outlet of the foaming liquid source is connected with the foaming liquid flow passage in the nozzle. The method solves the problem that an available particle image is difficult to obtain in the process of PIV measurement of the low-speed air flow field in the prior art.
Description
Technical Field
The invention belongs to the field of PIV velocity field measurement, and particularly relates to a helium bubble tracer particle generating device with a single nozzle.
Background
Particle Image Velocimetry (Particle Image Velocimetry) is a non-contact flow field measurement technology based on optics, overcomes the limitation that hot wire and laser Doppler Velocimetry can only measure a single point, and can obtain a space flow field velocity field structure under the condition of not interfering and damaging a flow field.
The basic principle of PIV measurement is: putting tracer particles capable of moving along with fluid into a flow field measurement area, continuously illuminating the tracer particles twice by using a light source under the synchronous working of the light source and a camera, obtaining images of the tracer particles at two illumination moments by continuously exposing twice through the camera, obtaining a displacement field of the particles by calculating and analyzing the images of the two particles, and calculating to obtain a velocity field of the measurement area by combining an image calibration coefficient and a time interval of the two illumination moments.
As known from the measurement principle, the PIV is a method for characterizing the local fluid motion of the particle by measuring the motion of the trace particles, so the quality of the result is closely related to the trace particles. To obtain accurate velocity field information, it is desirable that the trace particles have good flow-following and imaging visibility. In the air flow field, for the conventional liquid or solid tracer particles, the particle size of the particles which can be suspended in the air for a long time is basically in the nanometer or micrometer range, and the measurable spatial range is usually small under the limited illumination power due to the small particle size and the weak capability of scattering light.
In the test occasion of the low-speed air flow field, the test bed and the model are usually large, on one hand, a large measurement range requires a large illumination area, on the other hand, the distance between the camera and the measurement area is long, and the brightness of particles captured by the camera is low. When the visual field is large to a certain extent, the visual field is limited by the optical power of hardware, a usable image cannot be obtained by using conventional liquid or solid tracer particles, and seeking the tracer particles with larger particle size and still good flow following performance is one of the key means for solving the problem of PIV measurement of the low-speed air flow field.
Disclosure of Invention
In order to solve the problem that an available particle image is difficult to obtain in the process of PIV measurement of a low-speed air flow field in the prior art, the invention provides a helium bubble tracer particle generating device with a single nozzle.
The technical scheme of the invention is as follows: the helium bubble tracing particle generating device comprises a nozzle, an air source, a helium source and a foaming liquid source, wherein a coaxially nested fluid medium flow passage is arranged in the nozzle, the fluid medium flow passages are a helium flow passage, an air flow passage and a foaming liquid flow passage respectively, the helium source is connected with the helium flow passage in the nozzle, the air source is connected with the air flow passage in the nozzle, the air source is connected with an inlet of the foaming liquid source, and an outlet of the foaming liquid source is connected with the foaming liquid flow passage in the nozzle.
The nozzle comprises a coaxial needle head, a needle head jacket and an air cavity jacket; the coaxial needle head is formed by coaxially nesting and connecting an inner-layer needle head and an outer-layer needle head, a needle seat of the inner-layer needle head is connected with a helium source, a needle tube of the outer-layer needle head is connected with a foaming liquid source, the needle tubes of the inner-layer needle head and the outer-layer needle head extend to the outlet end of the needle head outer sleeve, and a gap between the inner-layer needle head and the outer-layer needle head forms a foaming liquid flow channel of the nozzle; the inside cavity formation cavity of air chamber overcoat, the air source communicates with this cavity, syringe needle overcoat exit end stretches into in the cavity, the space between syringe needle overcoat and air chamber overcoat is the air runner, the entry end and the coaxial syringe needle front end of syringe needle overcoat are connected, and this syringe needle overcoat links into an integrated entity coaxial syringe needle and air chamber overcoat.
The end face of the outlet end of the needle head outer sleeve is flush with the outer end face of the needle tube of the coaxial needle head.
The outer end faces of the needle tubes of the inner layer needle head and the outer layer needle head are parallel and level.
The outer wall of the outer-layer needle tube is provided with a through hole, and the foaming liquid source is connected with the through hole to convey the foaming liquid into the needle tube of the outer-layer needle.
The inner layer needle head and the outer layer needle head are flat head needle heads.
The inner layer needle head and the outer layer needle head are connected end to end.
The air source is an air bottle or an air compressor, the helium source is a helium bottle, and the foaming liquid source is a foaming liquid storage barrel.
The generating device also comprises a plurality of pressure reducing valves, and the pressure reducing valves are arranged on a pipeline connecting the air source and the nozzle, a pipeline connecting the helium source and the nozzle, and a pipeline connecting the air source and the foaming liquid source.
The coaxial needle is connected with the needle jacket in a sealing way, and the needle jacket is connected with the air cavity jacket in a sealing way.
The invention has the beneficial effects that:
1. the air source, the helium source and the foaming liquid source are supply sources of three media, namely air, helium and foaming liquid, required by helium bubble generation; the helium bubbles are soap bubbles filled with helium gas, the density of the helium gas is less than that of air, and the helium bubbles with good flow following property can be obtained by regulating and controlling the proportion of the helium gas and the foaming liquid. The helium bubble has a particle size of sub-millimeter or millimeter magnitude, and can meet the requirement of large-range imaging under the condition of low-power illumination. In addition, helium is an inert gas, has stable chemical properties, is generally difficult to react with other substances, and is harmless to human bodies due to small usage amount of helium, so that the helium bubbles as tracer particles have good safety, the helium bubbles as tracer particles have great advantages when being applied to a low-speed wind tunnel large-field PIV measurement environment, and the problem that usable particle images are difficult to obtain in the low-speed air flow field PIV measurement process in the prior art is solved.
2. The nozzle is composed of a coaxial needle head, a needle head outer sleeve and an air cavity outer sleeve, three coaxially nested medium flow channels are formed inside the nozzle, and a helium flow channel, a foaming liquid flow channel and an air flow channel are respectively formed from inside to outside.
Drawings
FIG. 1 is a schematic diagram of a single nozzle helium bubble tracer particle generating apparatus of the present invention;
FIG. 2 is an exploded view of the nozzle;
fig. 3 is a structural sectional view of the nozzle.
Description of the symbols:
1. the air cavity outer sleeve, 2, the needle head outer sleeve, 3, the outer needle head, 4, the inner needle head, 5, the coaxial needle head, 6, the nozzle, 7, the helium source, 8, the air source, 9, the foaming liquid source, 10, the pressure reducing valve, 11, the outlet of the foaming liquid source, 12, the inlet of the foaming liquid source, 16, the air flow channel, 17, the helium flow channel, 18, the foaming liquid flow channel.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in the following specific examples. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
With reference to fig. 1-3, the invention discloses a helium bubble tracer particle generating device with a single nozzle, which comprises a nozzle 6, an air source 8, a helium source 7 and a foaming liquid source 9, wherein a coaxially nested fluid medium flow passage is arranged in the nozzle 6, the fluid medium flow passages are respectively a helium flow passage 17, an air flow passage 16 and a foaming liquid flow passage 18, the helium source 7 is connected with the helium flow passage 17 in the nozzle 6, the air source 8 is connected with the air flow passage 16 in the nozzle 6, the air source 8 is connected with an inlet 12 of the foaming liquid source, and an outlet 11 of the foaming liquid source is connected with the foaming liquid flow passage 18 in the nozzle 6.
The nozzle 6 comprises a coaxial needle 5, a needle jacket 2 and an air cavity jacket 1; the coaxial needle 5 is formed by coaxially nesting and connecting an inner needle 4 and an outer needle 3, a needle seat of the inner needle 4 is connected with a helium source 7, a needle tube of the outer needle 3 is connected with a foaming liquid source 9, the needle tubes of the inner needle 4 and the outer needle 3 extend to the outlet end of the needle jacket 2, and a foaming liquid flow passage 18 of the nozzle 6 is formed by a gap between the inner needle 4 and the outer needle 3; the inside cavity formation cavity of air chamber overcoat 1, air source 8 and this cavity intercommunication, 2 exit ends of syringe needle overcoat stretch into in the cavity, the space between syringe needle overcoat 2 and air chamber overcoat 1 is air flow channel 16, the entry end and the 5 front ends of coaxial syringe needle of syringe needle overcoat 2 are connected, and this syringe needle overcoat 2 links into an organic whole coaxial syringe needle 5 and air chamber overcoat 1. The air source 8, the helium gas source 7 and the foaming liquid source 9 are three medium supply sources of air, helium gas and foaming liquid required by helium bubble generation; the nozzle 6 is a key part for generating helium bubbles, and the helium bubbles are generated in the nozzle and are pushed by air to be output outwards; a pipe connecting between the medium supply source and the nozzle 6 as a medium delivery passage; the pressure relief valve 10 is used to regulate the flow of the medium to the nozzle 6. The helium flow channel 17, the foaming liquid flow channel 18 and the air flow channel 16 are coaxially nested medium flow channels.
The end surface of the outlet end of the needle head outer sleeve 2 is flush with the outer end surface of the needle tube of the coaxial needle head 5. The outer end faces of the needle tubes of the inner layer needle head 4 and the outer layer needle head 3 are flush. The outer wall of the needle tube of the outer-layer needle head 3 is provided with a through hole, and the foaming liquid source 9 is connected with the through hole to convey the foaming liquid into the needle tube of the outer-layer needle head 3. The inner layer needle head 4 and the outer layer needle head 3 are flat head needle heads. The inner layer needle head 4 and the outer layer needle head 3 are connected end to end. The air source 8 is an air bottle or an air compressor, the helium source 7 is a helium bottle, and the foaming liquid source 9 is a foaming liquid storage barrel. The foaming liquid storage barrel is provided with an inlet port and an outlet port, the inlet port is connected with an air source 8 through a pipeline and a pressure reducing valve 10, and air is introduced into the foaming liquid storage barrel, so that the foaming liquid is conveyed to a foaming liquid flow passage 18 of the nozzle 6 through the outlet port and a foaming liquid pipeline under the drive of air pressure. The fluid medium flow in the corresponding pipeline can be adjusted by controlling the pressure behind the pressure reducing valve 10, so that ideal helium bubble tracer particles can be obtained. Air, helium and foaming liquid are converged at the front end of the nozzle 6 after passing through respective medium flow channels and then are sprayed out through the nozzle 6.
The generating device further comprises a plurality of pressure reducing valves 10, and the pressure reducing valves 10 are arranged on a pipeline connecting the air source 8 and the nozzle 6, a pipeline connecting the helium source 7 and the nozzle 6, and a pipeline connecting the air source 8 and the foaming liquid source 9. The coaxial needle 5 is hermetically connected with the needle jacket 2, and the needle jacket 2 is hermetically connected with the air cavity jacket 1.
The coaxial needle 5 is formed by coaxially nesting, welding or bonding two metal flat-head needles, and the needle tubes of the inner layer needle 4 and the outer layer needle 3 are flush with the outer end surface. The needle seat of the inner layer needle 4 is connected with a helium source through a pipeline, and the needle tube of the outer layer needle 3 is connected with a foaming liquid pipeline through a stainless steel tube welded or bonded through an opening. The inner space of the inner layer needle 4 is the helium gas flow passage 17 of the nozzle 6, and the gap between the inner layer needle and the outer layer needle forms the foaming liquid flow passage 18 of the nozzle 6.
The invention has simple structure and convenient operation; all parts of the nozzle 6 are connected in a welding or bonding mode, so that the assembly is easy; the generated helium bubbles can be used as tracer particles for PIV measurement, and are suitable for large-field measurement of a low-speed flow field.
The specific protection scope of the present invention is not limited to the above explanation, and any simple replacement or modification within the technical spirit of the present invention and technical solution according to the present invention should be within the protection scope of the present invention.
Claims (10)
1. The helium bubble tracer particle generating device with the single nozzle is characterized by comprising the nozzle (6), an air source (8), a helium source (7) and a foaming liquid source (9), wherein a coaxially nested fluid medium flow passage is arranged inside the nozzle (6), the fluid medium flow passages are respectively a helium flow passage (17), an air flow passage (16) and a foaming liquid flow passage (18), the helium gas source (7) is connected with the helium flow passage (17) in the nozzle (6), the air source (8) is connected with the air flow passage (16) in the nozzle (6), the air source (8) is connected with an inlet (12) of the foaming liquid source, and an outlet (11) of the foaming liquid source is connected with the foaming liquid flow passage (18) in the nozzle (6).
2. The single nozzle helium bubble tracer particle generating device of claim 1, wherein the nozzle (6) comprises a coaxial needle (5), a needle housing (2), an air chamber housing (1);
the coaxial needle head (5) is formed by coaxially nesting and connecting an inner needle head (4) and an outer needle head (3), a needle seat of the inner needle head (4) is connected with a helium source (7), a needle tube of the outer needle head (3) is connected with a foaming liquid source (9), the needle tubes of the inner needle head (4) and the outer needle head (3) extend to the outlet end of the needle head jacket (2), and a foaming liquid flow channel (18) of the nozzle (6) is formed by a gap between the inner needle head (4) and the outer needle head (3);
the inside cavity of air chamber overcoat (1) forms the cavity, air source (8) and this cavity intercommunication, syringe needle overcoat (2) exit end stretches into in the cavity, the space between syringe needle overcoat (2) and air chamber overcoat (1) is air flow channel (16), the entry end and the coaxial syringe needle (5) front end of syringe needle overcoat (2) are connected, and this syringe needle overcoat (2) links into an integrated entity coaxial syringe needle (5) and air chamber overcoat (1).
3. The single nozzle helium bubble tracer particle generating device of claim 2, wherein the end face of the outlet end of the needle jacket (2) is flush with the outer end face of the needle tube of the coaxial needle (5).
4. The single nozzle helium bubble tracer particle generating device according to claim 3, wherein the outer end faces of the needle tubes of the inner needle (4) and the outer needle (3) are flush.
5. The single nozzle helium bubble tracer particle generator as claimed in claim 4, wherein the outer wall of the needle tube of the outer needle (3) is perforated, and the source (9) of the foaming liquid is connected to the perforated tube to deliver the foaming liquid into the needle tube of the outer needle (3).
6. A single nozzle helium bubble tracer particle generator as claimed in claim 5 wherein the inner and outer needles (4, 3) are blunt needles.
7. A single nozzle helium bubble tracer particle generator as claimed in any of claims 2 to 6 wherein the inner and outer needles (4, 3) are connected end to end.
8. The single nozzle helium bubble tracer particle generating device according to claim 7, wherein the air source (8) is an air bottle or an air compressor, the helium source (7) is a helium bottle, and the foaming liquid source (9) is a foaming liquid tank.
9. Single nozzle helium bubble tracer particle generator according to claim 8, further comprising a plurality of pressure reducing valves (10), said pressure reducing valves (10) being arranged on the line connecting the air source (8) to the nozzle (6), the line connecting the helium source (7) to the nozzle (6), and the line connecting the air source (8) to the foaming liquid source (9).
10. The single nozzle helium bubble tracer particle generator of claim 9, wherein the coaxial needle (5) is sealingly connected to the needle housing (2) and the needle housing (2) is sealingly connected to the air chamber housing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211086996.3A CN115166293A (en) | 2022-09-07 | 2022-09-07 | Helium bubble tracer particle generating device with single nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211086996.3A CN115166293A (en) | 2022-09-07 | 2022-09-07 | Helium bubble tracer particle generating device with single nozzle |
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| Publication Number | Publication Date |
|---|---|
| CN115166293A true CN115166293A (en) | 2022-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211086996.3A Pending CN115166293A (en) | 2022-09-07 | 2022-09-07 | Helium bubble tracer particle generating device with single nozzle |
Country Status (1)
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| CN (1) | CN115166293A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103861511A (en) * | 2014-02-19 | 2014-06-18 | 中国矿业大学 | Mining porous spiral-type foam generating device |
| CN106290978A (en) * | 2016-08-25 | 2017-01-04 | 北京航空航天大学 | A kind of transverse injection agitation blends liquid trace displaying particle generator |
| CN112229597A (en) * | 2020-09-30 | 2021-01-15 | 中国空气动力研究与发展中心高速空气动力研究所 | Tracer particle generator for large-scale high-speed wind tunnel PIV test |
| CN112275149A (en) * | 2020-10-16 | 2021-01-29 | 华东师范大学 | Bulk-phase nano-bubble preparation system and preparation method |
| CN112351839A (en) * | 2018-10-05 | 2021-02-09 | 株式会社Ihi | Gas-liquid mixing nozzle |
| CN113405768A (en) * | 2021-06-16 | 2021-09-17 | 北京化工大学 | Airflow field PIV tracer particle preparation device and method based on nanobubble technology |
| US20220193623A1 (en) * | 2018-12-06 | 2022-06-23 | Tosslec Co., Ltd. | Bubble generation nozzle |
-
2022
- 2022-09-07 CN CN202211086996.3A patent/CN115166293A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103861511A (en) * | 2014-02-19 | 2014-06-18 | 中国矿业大学 | Mining porous spiral-type foam generating device |
| CN106290978A (en) * | 2016-08-25 | 2017-01-04 | 北京航空航天大学 | A kind of transverse injection agitation blends liquid trace displaying particle generator |
| CN112351839A (en) * | 2018-10-05 | 2021-02-09 | 株式会社Ihi | Gas-liquid mixing nozzle |
| US20220193623A1 (en) * | 2018-12-06 | 2022-06-23 | Tosslec Co., Ltd. | Bubble generation nozzle |
| CN112229597A (en) * | 2020-09-30 | 2021-01-15 | 中国空气动力研究与发展中心高速空气动力研究所 | Tracer particle generator for large-scale high-speed wind tunnel PIV test |
| CN112275149A (en) * | 2020-10-16 | 2021-01-29 | 华东师范大学 | Bulk-phase nano-bubble preparation system and preparation method |
| CN113405768A (en) * | 2021-06-16 | 2021-09-17 | 北京化工大学 | Airflow field PIV tracer particle preparation device and method based on nanobubble technology |
Non-Patent Citations (2)
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|---|
| 赵栋等: "《彩色氦气泡在风洞试验中的应用》", 《空气动力学学报》 * |
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Application publication date: 20221011 |