CN114062710A - 3D flow velocity measuring probe and measuring method - Google Patents
3D flow velocity measuring probe and measuring method Download PDFInfo
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- CN114062710A CN114062710A CN202111372385.0A CN202111372385A CN114062710A CN 114062710 A CN114062710 A CN 114062710A CN 202111372385 A CN202111372385 A CN 202111372385A CN 114062710 A CN114062710 A CN 114062710A
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- 239000000523 sample Substances 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 238000000691 measurement method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a 3D flow velocity measuring probe and a measuring method, wherein a first pressure measuring hole is arranged in the middle of the end face of a spherical probe, a second pressure measuring hole, a third pressure measuring hole, a fourth pressure measuring hole and a fifth pressure measuring hole are respectively arranged on the periphery of the end face of the spherical probe, the yaw angle and the pitch angle of the spherical probe are determined by calculating the pressure difference among different pressure measuring holes, and the air velocity can be determined according to the yaw angle, the pitch angle and a velocity pressure head (P1-P2).
Description
Technical Field
The invention belongs to the field of gas flow velocity parameter measurement, and particularly relates to a 3D flow velocity measurement probe and a measurement method.
Background
The measurement of gas flow velocity (or flow rate) is essential in many fields, and several flow monitoring techniques have been applied in many fields, and direct methods include uniform velocity tube flow meters (typically, S-type pitot tubes), thermal gas mass flow meters, ultrasonic gas flow meters, and optical scintillation correlation flow meters; indirect methods include estimating flue gas emission flow with fuel flow, such as greenhouse gas emission metering of natural gas boilers.
However, the measurement of the flue gas flow of fixed pollution sources such as coal-fired power plants and industrial kilns is always a difficult problem, the flow state in the flue is usually unstable due to the shortage of straight pipe sections of the flue, and the flow state in the rectangular flue is more difficult to describe due to the larger rectangular flue and irregular flow field. The flue gas contains corrosive gas, dust, water vapor and the like, and the outlet flue gas of the wet desulphurization device contains viscous gypsum slurry drops, which can bring a series of problems of corrosion, adhesion, blockage and the like to a flow measuring instrument. This can have an impact on the stability of the measurement and the routine maintenance of the measurement device, and it is a challenge how to accurately measure the flue gas flow rate.
Disclosure of Invention
The invention aims to solve the problem of accuracy of flue gas flow velocity measurement, and provides a 3D flow velocity measurement probe and a measurement method, so that the accuracy of flow velocity measurement is improved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a 3D velocity of flow surveys probe, includes five pressure taps that are provided with on the spherical probe of thermocouple, and five pressure taps are provided with the middle part and the four sides of the terminal surface of spherical probe respectively, and the terminal surface middle part be first pressure tap, be second pressure tap, third pressure tap, fourth pressure tap and fifth pressure tap on the four sides respectively.
The pressure difference between the second pressure measuring hole and the third pressure measuring hole is used for determining the yaw angle of the spherical probe and enabling the yaw to return to zero.
And the pressure difference between the fourth pressure measuring hole and the fifth pressure measuring hole is used for determining the pitch angle of the spherical probe.
The pressure difference between the first pressure tap and the second pressure tap is used to determine the axial velocity of the air flow at the location of the spherical probe.
A measuring method of a 3D flow velocity measuring probe comprises the following steps:
and S1, determining the yaw angle of the probe according to the pressure difference of the second pressure measuring hole and the third pressure measuring hole, rotating the spherical probe until the yaw angle pressure gauge displays zero differential pressure reading (P2 is P3), and reading and recording the angle of the spherical probe.
S2, determining the pitch angle of the spherical probe according to the pressure difference between the fourth pressure measuring hole and the fifth pressure measuring hole;
s3, keeping the spherical probe at the position with zero yaw angle, and obtaining the pressure difference readings of (P1-P2) and (P4-P5);
and S4, determining the axial speed of the airflow according to the yaw angle, the pitch angle and the speed head (P1-P2) of the spherical probe.
The axial velocity of the gas flow is as follows:
wherein v isa(i)Is the axial velocity at i, F2(i)For the velocity calibration value coefficient at i, P1Is the pressure value, P, measured at the first pressure tap2Is the pressure value, T, measured at the second pressure taps(i)Is the absolute temperature of the flue and is,
θy(i)is yaw angle, θp(i)For pitch angle, Ps is absolute pressure and Ms is molecular weight.
Coefficient of velocity calibration value F2(i)The calculation method of (2) is as follows:
wherein, CpFor pitot tube calibration factor, Δ PstdVelocity pressure from a calibration pitot tube.
The average axial velocity of the air flow at the test position of the spherical probe is calculated as follows:
wherein v isa(i)Is the axial velocity at i.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the middle part of the end face of the spherical probe is provided with the first pressure measuring hole, and the four sides of the end face of the spherical probe are respectively provided with the second pressure measuring hole, the third pressure measuring hole, the fourth pressure measuring hole and the fifth pressure measuring hole, the yaw angle and the pitch angle of the spherical probe are determined by calculating the pressure difference among different pressure measuring holes, and the gas flow rate can be determined according to the yaw angle, the pitch angle and the (P1-P2).
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of the present invention;
the device comprises a first pressure measuring hole, a second pressure measuring hole, a third pressure measuring hole, a fourth pressure measuring hole, a fifth pressure measuring hole, a thermocouple, a spherical probe and a pressure measuring hole, wherein the pressure measuring hole comprises 1, the first pressure measuring hole, 2, the second pressure measuring hole, 3, the third pressure measuring hole, 4, the fourth pressure measuring hole, 5, the fifth pressure measuring hole, 6, the thermocouple and 7.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 and 2, a 3D flow rate measurement probe includes five pressure taps disposed on a spherical probe 7 of a thermocouple 6, the five pressure taps are disposed on the middle and four sides of an end surface of the spherical probe 7, respectively, the middle of the end surface is a first pressure tap 1, and the four sides are a second pressure tap 2, a third pressure tap 3, a fourth pressure tap 4, and a fifth pressure tap 5, respectively.
The pressure difference between the second 2 and third 3 pressure taps is used to zero the spherical probe 7 yaw and determine the yaw angle. The pressure difference between the fourth pressure tap 4 and the fifth pressure tap 5 is used to determine the pitch angle of the spherical probe 7. The pressure difference between the first 1 and second 2 pressure taps is used to determine the axial velocity of the air flow at the location of the ball probe 7.
A measuring method of a 3D flow velocity measuring probe comprises the following steps:
and S1, determining the yaw angle of the probe according to the pressure difference of the second pressure measuring hole and the third pressure measuring hole, rotating the spherical probe until the yaw angle pressure gauge displays zero differential pressure reading (P2 is P3), and reading and recording the angle of the spherical probe.
S2, determining the pitch angle of the spherical probe according to the pressure difference between the fourth pressure measuring hole and the fifth pressure measuring hole;
s3, keeping the spherical probe at the position with zero yaw angle, and obtaining the pressure difference readings of (P1-P2) and (P4-P5);
and S4, determining the axial speed of the airflow according to the yaw angle, the pitch angle and the speed head (P1-P2) of the spherical probe.
The axial velocity of the gas flow is as follows:
wherein v isa(i)Is the axial velocity at i, F2(i)For the velocity calibration value coefficient at i, P1Is the pressure value, P, measured at the first pressure tap2Is the pressure value, T, measured at the second pressure taps(i)Is the absolute standard temperature of the flue, thetay(i)Is yaw angle, θp(i)For pitch angle, Ps is absolute pressure and Ms is molecular weight. Coefficient of velocity calibration value F2(i)The calculation method of (2) is as follows:
wherein, CpFor pitot tube calibration factor, Δ PstdIs the velocity pressure from the calibration pitot tube.
The average axial velocity of the air flow at the test position of the spherical probe 7 is calculated as follows:
wherein v isa(i)Is the axial velocity at i.
Claims (8)
1. The utility model provides a 3D velocity of flow surveys probe, its characterized in that includes five pressure taps that set up on spherical probe (7) of thermocouple (6), and five pressure taps set up respectively on middle part and the four sides of the terminal surface of spherical probe (7), and the terminal surface middle part be first pressure tap (1), and last difference all around is second pressure tap (2), third pressure tap (3), fourth pressure tap (4) and fifth pressure tap (5).
2. A 3D flow rate measurement probe according to claim 1, characterized in that the pressure difference of the second pressure tap (2) and the third pressure tap (3) is used to determine the yaw angle of the spherical probe (7) and to zero the yaw.
3. A 3D flow rate measurement probe according to claim 1, characterized in that the pressure difference between the fourth pressure tap (4) and the fifth pressure tap (5) is used to determine the pitch angle of the spherical probe (7).
4. A 3D flow rate measurement probe according to claim 1, characterized in that the pressure difference between the first pressure tap (1) and the second pressure tap (2) is used to determine the air flow rate at the location of the spherical probe (7).
5. The method for measuring a 3D flow rate measuring probe according to claim 1, comprising the steps of:
s1, determining the yaw angle of the spherical probe (7) according to the pressure difference of the second pressure measuring hole (2) and the third pressure measuring hole (3), rotating the spherical probe (7) until the yaw angle pressure gauge displays zero differential pressure reading (P2 is P3), and reading and recording the angle of the spherical probe (7);
s2, determining the pitch angle of the spherical probe (7) according to the pressure difference between the fourth pressure measuring hole (4) and the fifth pressure measuring hole (5);
s3, keeping the spherical probe (7) at the position with zero yaw angle, and obtaining the differential pressure readings of (P1-P2) and (P4-P5);
and S4, determining the axial speed of the airflow according to the yaw angle, the pitch angle and the speed head (P1-P2) of the spherical probe (7).
6. A method for determining a 3D flow rate probe according to claim 5, characterized in that the spherical probe (7) is positioned with the following axial velocities of the air flow:
wherein v isa(i)Is the axial velocity of the gas flow at i, F2(i)For the velocity calibration value coefficient at i, P1Is the pressure value, P, measured at the first pressure tap2Is the pressure value, T, measured at the second pressure taps(i)Is the absolute temperature of the gas flow at i, θy(i)Is yaw angle, θp(i)Is a pitch angle.
7. The method as claimed in claim 6, wherein the velocity calibration value factor F is2(i)The calculation method of (2) is as follows:
wherein, CpFor pitot tube calibration factor, Δ PstdIs the velocity pressure from the calibration pitot tube.
8. A method for determining a 3D flow rate probe according to claim 6, characterized in that the average axial velocity of the air flow at the test position of the spherical probe (7) is calculated as follows:
wherein v isa(i)Is the axial velocity at i.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111372385.0A CN114062710A (en) | 2021-11-18 | 2021-11-18 | 3D flow velocity measuring probe and measuring method |
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| CN202111372385.0A CN114062710A (en) | 2021-11-18 | 2021-11-18 | 3D flow velocity measuring probe and measuring method |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120144931A1 (en) * | 2009-08-18 | 2012-06-14 | Mtu Aero Engines Gmbh | Pressure-measuring probe |
| CN102636662A (en) * | 2012-04-20 | 2012-08-15 | 南京航空航天大学 | Full-flow direction flow velocity measurement probe and measurement method thereof |
| CN206074051U (en) * | 2016-07-21 | 2017-04-05 | 南京天测检测有限公司 | A kind of flue gas flowrate calibrating device based on porous probe |
| CN106840510A (en) * | 2017-03-06 | 2017-06-13 | 北京航空航天大学 | A kind of steady temperature force combination probe for measuring supersonic speed two-dimensional flow field |
| CN111257591A (en) * | 2020-03-31 | 2020-06-09 | 中国舰船研究设计中心 | Method and device for measuring wind speed and wind direction of seven-hole probe airflow field |
| US20210325421A1 (en) * | 2020-04-16 | 2021-10-21 | Government Of The United States Of America, As Represented By The Secretary Of Commerce | Non-nulling gas velocity measurement apparatus and performing non-nulling measurement of gas velocity parameters |
| WO2022097834A1 (en) * | 2020-11-04 | 2022-05-12 | 한국표준과학연구원 | Three-dimensional flow velocity measurement apparatus, and three-dimensional flow velocity measurement system and method using same in smokestack site |
-
2021
- 2021-11-18 CN CN202111372385.0A patent/CN114062710A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120144931A1 (en) * | 2009-08-18 | 2012-06-14 | Mtu Aero Engines Gmbh | Pressure-measuring probe |
| CN102636662A (en) * | 2012-04-20 | 2012-08-15 | 南京航空航天大学 | Full-flow direction flow velocity measurement probe and measurement method thereof |
| CN206074051U (en) * | 2016-07-21 | 2017-04-05 | 南京天测检测有限公司 | A kind of flue gas flowrate calibrating device based on porous probe |
| CN106840510A (en) * | 2017-03-06 | 2017-06-13 | 北京航空航天大学 | A kind of steady temperature force combination probe for measuring supersonic speed two-dimensional flow field |
| CN111257591A (en) * | 2020-03-31 | 2020-06-09 | 中国舰船研究设计中心 | Method and device for measuring wind speed and wind direction of seven-hole probe airflow field |
| US20210325421A1 (en) * | 2020-04-16 | 2021-10-21 | Government Of The United States Of America, As Represented By The Secretary Of Commerce | Non-nulling gas velocity measurement apparatus and performing non-nulling measurement of gas velocity parameters |
| WO2022097834A1 (en) * | 2020-11-04 | 2022-05-12 | 한국표준과학연구원 | Three-dimensional flow velocity measurement apparatus, and three-dimensional flow velocity measurement system and method using same in smokestack site |
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