CN107289991A - Method and apparatus for measuring hydroturbine rotor biphase gas and liquid flow - Google Patents
Method and apparatus for measuring hydroturbine rotor biphase gas and liquid flow Download PDFInfo
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- CN107289991A CN107289991A CN201610192153.XA CN201610192153A CN107289991A CN 107289991 A CN107289991 A CN 107289991A CN 201610192153 A CN201610192153 A CN 201610192153A CN 107289991 A CN107289991 A CN 107289991A
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- flow
- ultrasonic signal
- biphase gas
- liquid flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The present invention provides a kind of method and apparatus for measuring hydroturbine rotor biphase gas and liquid flow.This method and device can recognize each phase content, speed and the flow of hydroturbine rotor biphase gas and liquid flow, and bulk flow velocity, flow.The device includes：Measure pipeline (1), ultrasonic signal emission device (2), ultrasonic signal and receive device (3), data Collection ＆ Processing System (4), control computer (5), differential pressure flowmeter (6).The device can recognize each phase content, speed and the flow of biphase gas and liquid flow, and bulk flow velocity, flow.
Description
Technical field
The present invention relates to field of fluid measurement, specifically a kind of being used for based on ultrasonic Doppler technique measures hydroturbine rotor gas-liquid
The method and apparatus of two phase flow.This method and device can recognize each phase content, speed and the flow of biphase gas and liquid flow, Yi Jizong
Body average speed, flow.
Background technology
The flow phenomenon of two phase flow is widely present in engineering, wherein the most universal with biphase gas and liquid flow.Such as petroleum transportation pipeline
Around interior, hydroturbine rotor, the intracloud convection current of air etc., belong to biphase gas and liquid flow flowing.Flowed by two phase flow
Parameter is measured, and understands its characteristic and changing rule, is of great significance for related scientific research, design and production tool.
Compared with single-phase flow, two phase flow due to boundary it is each it is alternate there is mass transfer, or even chemical reaction, and in the time, spatially
It is random variable so that the detection of the flow parameter such as each phase content, flow velocity, flow and overall rate, flow is more complicated
Property, difficulty is very big.So far, existing detection technique and method are built upon the detection hand on single-phase sensor integration mostly
Section, the information content of acquisition is small, and can not carry out real-time monitored description to the overall permanence of two phase flow.
With the metering in industrial production for two phase flow, the requirements at the higher level of control aspect, it is necessary to develop one kind can be simultaneously
Measurement obtain biphase gas and liquid flow in each phase content, flow velocity and flow, and bulk flow velocity, flow device.How general ultrasound is
Le technology (Ultrasonic Doppler) can realize visualization, noncontact, radiationless, inexpensive measurement, in recent years in fluid
Application in terms of measurement has obtained very big development.Specifically the application principle in gas-liquid two-phase flow measurement is：Utilize ultrasound emission
Device is launched to the ultrasonic signal that biphase gas and liquid flow flow field tranmitting frequency is fe, when there is bubble to enter measurement volume, due to gas-liquid table
There is very strong reflex in face of ultrasound, ultrasonic echo signal fr is attenuated, and fe and fr difference fd, as Doppler
Frequency displacement, it is directly linear with bubble velocity.Thus, measure ultrasonic Doppler frequency displacement in flow field, you can ground vapour is worked as in acquisition
Phase velocity.Continuous measurement can also obtain each phase velocity of split-phase and flow of foregoing biphase gas and liquid flow, if be equipped with it is multiple other
The sensor of type, realizes measurement in a closed series, then can obtain the flow parameter of complete biphase gas and liquid flow.
The present invention provides a kind of method and apparatus for measuring hydroturbine rotor biphase gas and liquid flow based on ultrasonic Doppler technique.
This method and device can recognize each phase content, speed and the flow of biphase gas and liquid flow, and bulk flow velocity, flow.
The content of the invention
The present invention provides a kind of method and apparatus for measuring hydroturbine rotor biphase gas and liquid flow.This method and device can be recognized
Each phase content, speed and the flow of biphase gas and liquid flow, and bulk flow velocity, flow.Fig. 1 is to be based on ultrasonic Doppler
The layout of the gas-liquid two-phase flow measuring apparatus of technology.Shown in figure, the device includes：Measure pipeline (1), ultrasonic signal hair
Emitter (2), ultrasonic signal receivers (3), data Collection ＆ Processing System (4), control computer (5), differential pressure flowmeter
(6).Its annexation is：
Ultrasonic signal emission device (2) is arranged on the tube wall of the measurement pipeline (1) of tested biphase gas and liquid flow flowing；
Ultrasonic signal receivers (3) are arranged on ultrasonic signal emission device (2) opposite；
Ultrasonic signal receivers (3) connection data Collection ＆ Processing System (4)；
Differential pressure flowmeter (6) is located on measurement pipeline (1), the downstream in ultrasonic signal emission device (2)；
Control computer (5) connection ultrasonic signal emission device (2), ultrasonic signal receivers (3), data Collection ＆ Processing System (4).
Fig. 2 is the schematic diagram of each phase content of ultrasonic Doppler technique measurement biphase gas and liquid flow.Represented in figure, along measurement pipeline (1)
On section on middle two phase flow direction, ultrasound letter is installed on measurement pipeline both sides placement ultrasonic signal emission device (2), its opposite
Number receiver (3).During measurement, ultrasonic signal emission device transmitting pulsed ultrasonic signal (7) measures two phase flow in pipeline
During flowing, bubble (9) and each phase content of liquid (8) and being continually changing for being distributed, because ultrasonic measurement volume has a certain size,
Wherein all Moving Bubbles can all produce doppler shifted signal, and ultrasonic signal receivers (3) receive signal and provided to the measurement
Result after all signals are carried out averagely in volume.Data Collection ＆ Processing System (4) to echo signal by carrying out quick Fu
In leaf transformation (FFT) analyze, the spectrogram of Doppler frequency shift can be obtained, so that the spectrum distribution of speed is obtained, in vapor-liquid two phases
Obvious sliding velocity is there is in stream, between liquid and gas, is presented as obvious in the speed spectrum distribution that FFT is provided
Bimodal distribution.By digital filtering and FFT inverse transformations, the split-phase speed of gas-liquid two-phase is obtained respectively.
Brief description of the drawings
Fig. 1 is the layout of the gas-liquid two-phase flow measuring apparatus based on ultrasonic Doppler technique；In figure, 1 measurement pipeline, 2
Ultrasonic signal emission device, 3 ultrasonic signal receivers, 4 data Collection ＆ Processing Systems, 5 control computers, 6 differential pressure flows
Meter.
Fig. 2 is the schematic diagram of each phase content of ultrasonic Doppler technique measurement biphase gas and liquid flow；In figure, 1 measurement pipeline, 2
Ultrasonic signal emission device, 3 ultrasonic signal receivers, 7 ultrasonic signals, 8 liquid, 9 bubbles.
Embodiment
Further illustrate that being used for based on ultrasonic Doppler technique proposed by the present invention measures the hydraulic turbine with a specific embodiment
The principle and structure of the method and apparatus of rotor biphase gas and liquid flow.This method and device are used for each phase for measuring Air-C_2H_2 Flame
Content, speed and flow, and bulk flow velocity, flow.Part composition and annexation and Fig. 1 phases in the device
Together.In embodiment, the section of measurement pipeline (1) is square, be length be 1m, inner edge be 50mm,
Wall thickness 10mm, material are lucite.Horizontal positioned.Ultrasonic signal emission device (2) launches ultrasonic signal, and transmission is empty
Gas-water phases stream fluid produces Doppler frequency shift；Data Collection ＆ Processing System (4) measures Doppler frequency shift, carries out data
Processing, obtains Gas-water phases stream flow field in the transient components measured；Control computer (5) connection, control data
Collection and the operation of processing system (4), while the continuous sampling interval of data Collection ＆ Processing System (4) is provided, so that
Obtain the split-phase speed of Air-Water；Differential pressure flowmeter (6) measures total flow in the downstream of measurement pipeline (1).
Claims (2)
1. the method and apparatus for measuring hydroturbine rotor biphase gas and liquid flow, this method and device include measurement pipeline (1), ultrasound
Signal projector (2), ultrasonic signal receivers (3), data Collection ＆ Processing System (4), control computer (5),
Differential pressure flowmeter (6), be with the annexation of upper-part：
Ultrasonic signal emission device (2) is arranged on the tube wall of the measurement pipeline (1) of tested biphase gas and liquid flow flowing；
Ultrasonic signal receivers (3) are arranged on the tube wall of measurement pipeline (1)；
Ultrasonic signal receivers (3) connection data Collection ＆ Processing System (4)；
Differential pressure flowmeter (6) is located on measurement pipeline (1), the downstream in gamma-rays transmitter (2)；
Control computer (5) connection ultrasonic signal emission device (2), ultrasonic signal receivers (3), data acquisition and procession system
Unite (4).
2. a kind of method and apparatus for measuring hydroturbine rotor biphase gas and liquid flow according to claim l, its feature
It is, described ultrasonic signal emission device (2) and ultrasonic signal receivers (3) is separately mounted to measurement pipeline (1)
Opposite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192153.XA CN107289991A (en) | 2016-03-30 | 2016-03-30 | Method and apparatus for measuring hydroturbine rotor biphase gas and liquid flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192153.XA CN107289991A (en) | 2016-03-30 | 2016-03-30 | Method and apparatus for measuring hydroturbine rotor biphase gas and liquid flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107289991A true CN107289991A (en) | 2017-10-24 |
Family
ID=60087138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610192153.XA Pending CN107289991A (en) | 2016-03-30 | 2016-03-30 | Method and apparatus for measuring hydroturbine rotor biphase gas and liquid flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107289991A (en) |
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2016
- 2016-03-30 CN CN201610192153.XA patent/CN107289991A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171024 |