CN107677611B - Optical identification device and method for flow pattern in two-phase region - Google Patents
Optical identification device and method for flow pattern in two-phase region Download PDFInfo
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- CN107677611B CN107677611B CN201710882974.0A CN201710882974A CN107677611B CN 107677611 B CN107677611 B CN 107677611B CN 201710882974 A CN201710882974 A CN 201710882974A CN 107677611 B CN107677611 B CN 107677611B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 230000005514 two-phase flow Effects 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 239000003153 chemical reaction reagent Substances 0.000 claims description 5
- 235000013405 beer Nutrition 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 230000031700 light absorption Effects 0.000 abstract 1
- 239000012530 fluid Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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Abstract
本发明公开了一种两相区流型的光学识别装置，包括计算终端、若干光发射器和若干光接收器，光发射器和光接收器均分布在管道内壁上，光发射器和光接收器两两相对，光发射器和光接收器均与计算终端连接。同时也公开了该装置的识别方法。本发明提供的两相区流型的光学识别装置，在液体的复杂的两相区，基于光的吸收性，计算出某一时刻某个位置气态和液态分别所占的宽度，延伸至整个管子，便能进行整个管道内流型的识别。
The invention discloses a two-phase flow type optical identification device, comprising a computing terminal, a plurality of optical transmitters and a plurality of optical receivers, the optical transmitters and the optical receivers are distributed on the inner wall of the pipeline, the optical transmitter and the optical receiver are two Oppositely, both the optical transmitter and the optical receiver are connected to the computing terminal. At the same time, an identification method of the device is also disclosed. The optical identification device of the two-phase region flow type provided by the present invention, in the complex two-phase region of the liquid, based on the absorption of light, calculates the width occupied by the gaseous state and the liquid state at a certain position at a certain moment, and extends to the entire tube. , the flow pattern in the entire pipeline can be identified.
Description
Technical Field
The invention relates to an optical recognition device and method for a two-phase region flow pattern, and belongs to the technical field of fluid measurement.
Background
The liquid is vaporized and changed into water vapor to form a two-phase region, which is a relatively complex flow state in the pipeline flow, and the flow is a dynamic process in addition, so the flow in the gas-liquid mixing region is difficult to be analyzed by a simple theory.
In our daily life, gas-liquid two-phase flow is a very common phenomenon, for example, in the process that water in a heat collecting pipe absorbs heat and becomes wet saturated water vapor, the flowing condition in a flow passage cannot be known, so that more deep and targeted enhanced heat transfer cannot be performed. If we can effectively identify the fluid flow pattern and know the real-time flow condition, the safety of the production process can be effectively improved, if the fluid flow pattern is slightly utilized, the harmful flow can be effectively avoided, the energy is saved, and the production efficiency is improved.
Disclosure of Invention
In order to solve the technical problem, the invention provides an optical identification device and method for a two-phase region flow pattern.
In order to achieve the purpose, the invention adopts the technical scheme that:
the optical identification device comprises a calculation terminal, a plurality of light emitters and a plurality of light receivers, wherein the light emitters and the light receivers are distributed on the inner wall of a pipeline, the light emitters and the light receivers are opposite to each other in pairs, and the light emitters and the light receivers are connected with the calculation terminal.
The light emitter and the light receiver are arranged in the opening of the inner wall of the pipeline, and the end faces of the light emitter and the light receiver are flush with the inner wall of the pipeline.
And the inner wall of the pipeline is provided with a film which covers the end faces of the light emitter and the light receiver.
The light emitters and the light receivers are uniformly distributed on the inner wall of the pipeline.
A method for recognizing a flow pattern in a two-phase region by an optical recognition device comprises,
before the liquid is fed into the pipeline, a certain amount of chemically stable gas is fed into the pipeline to obtain the gas concentration in the pipeline;
after liquid enters the pipeline, adding a certain amount of stabilizing reagent into the liquid to obtain the liquid concentration;
the light emitter emits light and sends the incident intensity of the light to the computing terminal;
the optical receiver receives light and sends the emergent intensity of the light to the computing terminal;
and the calculation terminal calculates the widths occupied by the gas and the liquid at a certain position at a certain moment by using the Lambert beer law, and extends the widths to the whole pipeline to obtain the internal flow pattern of the whole pipeline.
The formula for calculating the width occupied by the gas and the liquid respectively at a certain position at a certain moment is as follows,
wherein, b1Thickness of the gas-absorbing layer, b2Is the thickness of the liquid absorption layer, R is the inner diameter of the pipeline, K is the molar absorption coefficient, c1Is the gas concentration, c2Is the liquid concentration,/0Is the incident intensity of light, /)2Is light ofThe intensity of the exit through the liquid zone.
The invention achieves the following beneficial effects: the optical identification device of the flow pattern in the two-phase area calculates the width occupied by the gas state and the liquid state at a certain position at a certain moment in the complex two-phase area of the liquid based on the absorptivity of light, and the optical identification device extends to the whole pipe, so that the identification of the flow pattern in the whole pipeline can be carried out.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
FIG. 2 is a schematic longitudinal sectional view of the present invention;
FIG. 3 shows the flow pattern at a certain cross-section;
fig. 4 is a coordinate axis structure.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 and 2, an optical identification device of a two-phase flow pattern includes a computing terminal, a plurality of light emitters 2, and a plurality of light receivers 3.
The identification method of the device comprises the following specific steps:
1) before liquid enters the pipeline, a certain amount of chemically stable gas is introduced, and the gas concentration in the pipeline is obtained by dividing the known gas volume by the total volume in the pipeline;
2) after the liquid enters the pipeline, adding a certain amount of stabilizing reagent into the liquid, and dividing the known reagent amount by the total liquid amount to obtain the liquid concentration;
3) the light emitter 2 emits light and sends the incident intensity of the light to the computing terminal;
4) the optical receiver 3 receives light and sends the emergent intensity of the light to the computing terminal;
5) and the calculation terminal calculates the widths occupied by the gas and the liquid at a certain position at a certain moment by using the Lambert beer law, and extends the widths to the whole pipeline 1 to obtain the internal flow pattern of the whole pipeline 1.
The specific calculation formula is as follows:
absorption A of the gas region1＝lg(l0/l1)＝Kc1b1；
Absorbency of liquid area A2＝lg(l1/l2)＝Kc2b2；
Then the following system of equations can be obtained:
wherein, b1Thickness of the gas-absorbing layer, b2Is the thickness of the liquid absorption layer, R is the inner diameter of the pipeline, K is the molar absorption coefficient, c1Is the gas concentration, c2Is the liquid concentration,/0Is the incident intensity of light, /)2Is the intensity of the light exiting through the liquid region.
Solving the system of equations to obtain b1And b2。
The flow pattern of the two-phase zone can be divided into vertical two-phase flow according to the shape of the fluid distribution: bubble flow, bullet flow, annular flow, mist flow, slug flow; horizontal two-phase flow: bubble flow, bulk flow, laminar flow, impingement flow, annular flow. Taking the annular flow as an example, the cross-sectional view is shown in FIG. 3, where b1Thickness of the gas-absorbing layer, b2For the thickness of the liquid-absorbing layer, a coordinate axis as shown in FIG. 4 is set as a circle having an inner diameter R in calculation, and b is collected1And b2According to the sizeThe marks are connected in a coordinate axis to form an arc line, so that the flow pattern shape of a certain section is obtained, and the flow pattern in the whole pipeline 1 is obtained by extending to the whole pipeline 1 according to the principle.
The optical identification device of the flow pattern in the two-phase area provided by the invention can calculate the width occupied by the gas state and the liquid state at a certain position at a certain moment in the complex two-phase area of the liquid based on the absorptivity of light, and can identify the flow pattern in the whole pipeline 1 by extending the calculated width to the whole pipe.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A method for recognizing a two-phase flow pattern optical recognition device, the two-phase flow pattern optical recognition device comprising: the device comprises a computing terminal, a plurality of light emitters and a plurality of light receivers, wherein the light emitters and the light receivers are distributed on the inner wall of a pipeline, the light emitters and the light receivers are opposite in pairs, and the light emitters and the light receivers are connected with the computing terminal; the method is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
before liquid enters the pipeline, chemically stable gas is introduced, and the gas concentration in the pipeline is obtained by dividing the known gas volume by the total volume in the pipeline;
after the liquid enters the pipeline, adding a stabilizing reagent into the liquid, and dividing the known reagent amount by the total liquid amount to obtain the liquid concentration;
the light emitter emits light and sends the incident intensity of the light to the computing terminal;
the optical receiver receives light and sends the emergent intensity of the light to the computing terminal;
and the calculation terminal calculates the widths occupied by the gas and the liquid at a certain position at a certain moment by using the Lambert beer law, and extends the widths to the whole pipeline to obtain the internal flow pattern of the whole pipeline.
2. The method for identifying a two-phase flow pattern optical identification device according to claim 1, wherein: the formula for calculating the width occupied by the gas and the liquid respectively at a certain position at a certain moment is as follows,
wherein, b1Thickness of the gas-absorbing layer, b2Is the thickness of the liquid absorption layer, R is the inner diameter of the pipeline, K is the molar absorption coefficient, c1Is the gas concentration, c2Is the liquid concentration,/0Is the incident intensity of light, /)2Is the intensity of the light exiting through the liquid region.
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| CN201710882974.0A CN107677611B (en) | 2017-09-26 | 2017-09-26 | Optical identification device and method for flow pattern in two-phase region |
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| CN201710882974.0A CN107677611B (en) | 2017-09-26 | 2017-09-26 | Optical identification device and method for flow pattern in two-phase region |
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| CN107677611B true CN107677611B (en) | 2020-03-31 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103543210A (en) * | 2013-11-14 | 2014-01-29 | 南京航空航天大学 | Pressurized pneumatic transmission flow type detection device and method based on acoustic emission technology |
| CN103558179A (en) * | 2013-10-09 | 2014-02-05 | 河北大学 | Apparatus and method for measuring sectional phase volume fraction of gas-liquid two-phase flow in pipeline |
| CN105973994A (en) * | 2016-06-15 | 2016-09-28 | 河北大学 | Gas-liquid-phase-flow flow-type recognition device and method based on noise measurement |
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- 2017-09-26 CN CN201710882974.0A patent/CN107677611B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103558179A (en) * | 2013-10-09 | 2014-02-05 | 河北大学 | Apparatus and method for measuring sectional phase volume fraction of gas-liquid two-phase flow in pipeline |
| CN103543210A (en) * | 2013-11-14 | 2014-01-29 | 南京航空航天大学 | Pressurized pneumatic transmission flow type detection device and method based on acoustic emission technology |
| CN105973994A (en) * | 2016-06-15 | 2016-09-28 | 河北大学 | Gas-liquid-phase-flow flow-type recognition device and method based on noise measurement |
Non-Patent Citations (3)
| Title |
|---|
| 光透法定量两相流中流体饱和度的模型及其应用;章艳红等;《环境科学》;20140630;第35卷(第6期);2120-2128 * |
| 基于红外技术的气液两相流空隙率测量技术研究;何峰等;《载人航天》;20130131;第19卷(第1期);58-63 * |
| 蒸发冷却电机管内气液两相流截面含气率测量的研究;余顺周等;《大电机技术》;20041231(第5期);1-4 * |
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