CN201637445U - Flow-velocity-field measuring system based on hotline array and intelligent two-dimensional reconstruction algorithm - Google Patents

Flow-velocity-field measuring system based on hotline array and intelligent two-dimensional reconstruction algorithm Download PDF

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Publication number
CN201637445U
CN201637445U CN2010201428540U CN201020142854U CN201637445U CN 201637445 U CN201637445 U CN 201637445U CN 2010201428540 U CN2010201428540 U CN 2010201428540U CN 201020142854 U CN201020142854 U CN 201020142854U CN 201637445 U CN201637445 U CN 201637445U
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flow
velocity
reconstruction algorithm
circuit
hot line
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CN2010201428540U
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Chinese (zh)
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李学哲
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Suzhou University of Science and Technology
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Suzhou University of Science and Technology
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Abstract

The utility model discloses a flow-velocity-field measuring system based on hotline array and intelligent two-dimensional reconstruction algorithm, which comprises mutually-disjoint hotline array formed by arraying a plurality of hotline resistance wires. The hotline resistance wires are arranged in a pipeline; the outside part of the hotline array is connected with a control circuit for controlling constant temperature and constant current of the hotline resistance wire and a measure circuit; measurement signals obtained by the measure circuit passes through a signal processing circuit, an analog/digital converting circuit to obtain flow-velocity field data in a data processing module through the two-dimensional reconstruction algorithm of a special model, and actual flow-rate is calculated out according to the flow-velocity field data. The system overcomes shortcoming of large flow-rate error caused by that 'point' type flow-velocity sensor can only measure the flow-velocity of one point in the pipeline, so as to realize accurate measurement of the flow-velocity-filed in the pipeline, thereby accurately calculating out the accrual flow rate in the pipeline. The system provides basis of the core technology to an air-supplying system of full-automation, networking, high-precision in construction, electricity and steel and other fields, and has obvious energy-saving emission-reduction effect.

Description

Velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm
Technical field
The utility model relates to a kind of velocity field measuring system, specifically belongs to a kind of system that rate of flow of fluid in the ventilating duct is measured.
Background technology
In fields such as building, electric power and iron and steel, all relate to the application of supply air system, this system need measure the rate of flow of fluid in the ventilating duct, so that calculate the flow of fluid exactly.That generally uses at present has a pitot tube type, propeller type and suddenly and all kinds of flow sensors such as effect electromagnetic type, and they mostly are " point " formula sensor greatly.In rectangle or circular fluid line, because of the velocity flow profile on the pipeline section (velocity field) inhomogeneous, and it is comparatively complicated, adopt " point " formula sensor can not measure the distribution of flow velocity in the pipeline simultaneously, effectively, the flow velocity that can only pick up any is represented the mean flow rate in cross section, and calculate flow in the pipeline according to this, the fluid flow error that obtains like this is very big.
This situation is for building ventilation, otherwise caused low ventilation influence healthy, reduce work efficiency; Blindly, augmented flow exceedingly, cause a large amount of energy dissipations.Equally, flow can't be measured exactly, also can cause huge waste or serious environmental to pollute to industrial trades such as electric power, iron and steel.
Summary of the invention
The utility model purpose is: a kind of velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm is provided, the accurate velocity flow profile in the measuring channel, and then calculate actual flow exactly, be easy to realize full-automatic, networked, high-precision supply air system, the energy-saving and emission-reduction of using the field are had obvious effects.
The technical solution of the utility model is: a kind of velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm, comprise the mutually disjoint hot line array that is arranged in by some hot wire silks, described hot wire silk is arranged in the pipeline, described hot line array periphery is connected with the control circuit and the metering circuit of control hot wire silk constant temperature or constant current, the measuring-signal that described metering circuit obtains is through signal processing circuit, behind the A/D conversion circuit in data processing module the 2-d reconstruction algorithm process by special purpose model obtain the velocity field data, and calculate actual flow according to this.
The further technical scheme of the utility model is: a kind of velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm, comprise the mutually disjoint hot line array that is arranged in by some hot wire silks, described hot wire silk is arranged in the pipeline, described hot line array periphery is connected with the control circuit and the metering circuit of control hot wire silk constant temperature or constant current, the measuring-signal that described metering circuit obtains is through signal processing circuit, behind the A/D conversion circuit in data processing module the 2-d reconstruction algorithm process by special purpose model obtain the velocity field data, and calculate actual flow according to this; Described hot line array can be mutually disjoint longitudinal and transverse array; Described hot wire silk is thermally sensitive resistance; Described metering circuit is a digitizing zeroing bridge diagram; Described digitizing zeroing bridge diagram is connected with temperature-compensation circuit.
The more detailed technical scheme of the utility model is: a kind of velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm, comprise the mutually disjoint hot line array that is arranged in by some hot wire silks, described hot wire silk is arranged in the pipeline, described hot line array periphery is connected with the control circuit and the metering circuit of control hot wire silk constant temperature or constant current, and the measuring-signal that described metering circuit obtains is through signal processing circuit, in data processing module, obtain the actual flow of velocity field behind the A/D conversion circuit by the 2-d reconstruction algorithm process of special purpose model; Described hot line array can be mutually disjoint longitudinal and transverse array; Described hot wire silk is thermally sensitive resistance; Described metering circuit is a digitizing zeroing bridge diagram; Described digitizing zeroing bridge diagram is connected with temperature-compensation circuit; Described control circuit is a closed loop circuit, and has indirect compensate function.
The utility model has the advantages that:
The utility model utilizes the hot line array to come the interior velocity flow profile of sensing ventilating duct, and combined with intelligent 2-d reconstruction algorithm realization inversion procedure is obtained the distributed data about the pipe interior flow velocity, this system has overcome can only measuring channel inner any the flow velocity of existing " point " formula flow sensor and has caused the big drawback of calculated flow rate error, realize the accurate measurement of pipeline inner fluid speed field, and then calculate flow actual in the pipeline exactly, for building, realize full-automatic in the field such as electric power and iron and steel, networking, high-precision energy-conservation supply air system has been established the technical foundation of core, and the energy-saving and emission-reduction of using the field are had obvious effects.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is a system chart of the present utility model;
Fig. 2 is the layout synoptic diagram of hot line array in the rectangle ventilating duct in the utility model.
Wherein: 1 is the hot line array; 2 is the hot wire silk; 3 is control circuit; 4 are digitizing zeroing bridge diagram; 5 is temperature-compensation circuit; 6 is signal processing circuit; 7 is A/D conversion circuit; 8 is data processing module; 9 is pipeline.
Embodiment
Embodiment: a kind of velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm, as shown in Figure 1 and Figure 2, comprise the hot line array 1 that is arranged in five vertical five horizontal strokes by 10 hot wire silks 2, their cross section projection has been divided into 25 to the cross section of ventilating duct 9 and has measured subregion.Described hot line array 1 periphery is connected with closed control circuit 3 and the metering circuit with indirect compensate function and control hot wire silk 2 constant temperature or constant current, described metering circuit is the digitizing zeroing bridge diagram 4 that is connected with temperature-compensation circuit 5, the measuring-signal that described digitizing zeroing bridge diagram 4 obtains is amplified in the A/D conversion circuit 7 through handling in signal processing circuit 6,2-d reconstruction algorithm process by special purpose model obtains the velocity field data in data processing module 8 at last, and calculates actual flow according to this.
Hot wire silk 2 is a kind of thermally sensitive resistance, from microcosmic, every hot wire silk 2 can be considered as the multistage linear resistance and be in series, as shown in Figure 1, can regard every for the time being as and constitute, so longitudinal and transversely have 25 miniature measuring resistances, it is expressed as R by 5 sections resistance 11～R 55, can suitably increase the quantity of hot wire silk 2 in order to improve measuring accuracy.Provide suitable electric current I by peripheral circuit for hot line according to measuring needs, hot line will heating up like this, finally is stabilized in a certain temperature.With the 3rd hot line of horizontal line is example, and 5 sections resistance R are arranged 31, R 32, R 33, R 34And R 35Constitute.When having fluid to flow through in the pipeline, just can take away the heat on the hot wire silk 2, cause the temperature of hot wire silk 2 to descend.Because the cross section velocity flow profile in the ventilating duct is complicated, heterogeneous, the flow velocity that flows through these 5 sections resistance is different, the heat of taking away is also different, show to be the resistance difference of each section resistance in the measuring system, therefore velocity flow profile information just can be reflected by the distribution of resistance of hot wire silk 2, the situation of all the other each bar hot wire silks 2 also is the same, and the distribution of flow velocity has been represented in the distribution of its resistance.
In the actual measurement process, if the voltage of hot line is U, the electric current of hot line is I, and the heat of hot line generation is so:
Q c＝0.24×I 2×R
Perhaps
Q c = 0.24 × U 2 R
Taken away the heat of hot line when fluid flows, usually the conductive heat loss and the radiation loss of hot line have been ignored, then the heat of hot line loss is:
Q l＝k×S×(T H-T A)
In the formula: k is the heat exchange coefficient between hot line and the fluid, and S is the heat transfer sheet area of hot line, T HBe the hot line temperature; T ABe fluid temperature (F.T.).
Therefore if Control current I (or U) and temperature T the two one of constant, then flow velocity V just can come out by another calculation of parameter.That is:
V＝f(I，T)
Or
V＝f(U，T)
When not having fluid to flow through hot line, hot line is in thermal equilibrium state, i.e. Q c=Q l
When fluid flow through hot line, thermal equilibrium state was destroyed, and the heat of fluid removal is main relevant with the k value, so flow velocity V just can be expressed as:
V = α × I 2 × R S × ( T H - T A ) - - - ( 1 )
In the formula: α is the flow velocity ratio correction coefficient.Just can calculate the mean flow rate of every hot line by following formula.
Temperature-compensation circuit 5 is to revise the influence of fluid temperature variations to measuring accuracy automatically by the measurement gas temperature.The utlity model has some fluid temperature (F.T.)s and measure,, solved because of using many hot-wire transducers to need the drawback of a plurality of compensating circuits to the circuit that multiple spot compensates indirectly.When gas temperature changed, temperature-compensation circuit 5 can be adjusted the magnitude of voltage of digitizing zeroing bridge diagram 4 automatically, keeps T H-T ABe a constant basis, to reach the purpose of compensation gas temperature variation.
Suppose that in the utility model measuring system has vertical hot line of m bar and the horizontal hot line of n bar, forms m+n bar independent and efficient sense path altogether.The resistance of every hot-wire transducer can be expressed as R p:
R p＝∫ Lc×ds
In the formula: c represent the hot line path power on the resistance ratio spatial character; Ds is the path differential of conventional hot wire.L represents whole hot line length.
M+n bar hot line is divided into m * n zone with whole flow field, is divided into 5 * 5 zone shown in the strokes and dots dotted line among Fig. 1.According to from left to right, order is from top to bottom used numeric suffix (i, j) (1≤i≤n, 1≤j≤m) indicate successively with measured zone.Resistance ratios in each section is unknown, and supposes that it is uniform.Here use Δ S (i, j)Expression the (then discrete back n bar hot wire value can be expressed as for i, j) section heat circuit electrical path length:
R p = Σ j = 1 m c ( n , j ) × Δ s ( n , j )
And the resistance value of every hot line of actual measurement is R ' p, then measured value and R pDifference be:
ϵ n = R p ′ - Σ j = 1 m c ( n , j ) × Δ s ( n , j )
Resistance vector on horizontal (OK) line can be expressed as:
R ROW＝[r row，1?r row，2 … r row，n] T
R′ ROW＝[r′ row，1 r′ row，2 … r′ row，n] T
Resistance vector on vertical (row) line can be expressed as:
R COL＝[r col，1r col，2 … r col，m]
R′ COL＝?[r′ col，1?r′ col，2… r′ col，m]
The objective criteria function can be chosen multiple function, chooses the mean square deviation function in the present embodiment, and then corresponding optimization problem can be described as:
min C ∈ R n * m J ( C ) = 1 2 × ( Σ i = 1 n ( r row , i ′ - Σ j = 1 m c i , j × Δ s i , j ) 2 + Σ i = 1 m ( r col , i ′ - Σ j = 1 n c j , i × Δ s j , i ) 2 )
In the formula:
C = c ( 1,1 ) c ( 1,2 ) . . . c ( 1 , m ) c ( 2,1 ) c ( 2,2 ) . . . c ( 2 , m ) . . . . . . . . . . . . c ( n , 1 ) c ( n , 2 ) . . . c ( n , m )
S = Δ s ( 1,1 ) Δ s ( 1,2 ) . . . Δ s ( 1 , m ) Δ s ( 2,1 ) Δ s ( 2,2 ) . . . Δ s ( 2 , m ) . . . . . . . . . . . . Δ s ( n , 1 ) Δ s ( n , 2 ) . . . Δ s ( n , m )
Like this, just can utilize multiple intelligent optimization algorithm and pipeline fluid model to carry out Inversion Calculation, obtained the spatial character of each cut zone, it is the resistance variations that fluid causes when this zone flows, because electric current I is known, (1) formula of utilization can be obtained each regional mean flow rate, with the flow velocity of each zone leveling flow velocity as the region geometry central point, utilizes the intelligent interpolation algorithm just can simulate whole two-dimentional velocity field to be measured.
The utility model utilizes the hot line array to come the interior velocity flow profile of sensing ventilating duct, and combined with intelligent 2-d reconstruction algorithm realization inversion procedure is obtained the distributed data about the pipe interior flow velocity, this system has overcome can only measuring channel inner any the flow velocity of existing " point " formula flow sensor and has caused the big drawback of calculated flow rate error, realize the accurate measurement of pipeline inner fluid speed field, and then calculate flow actual in the pipeline exactly, for building, realize full-automatic in the field such as electric power and iron and steel, networking, high-precision energy-conservation supply air system has been established the technical foundation of core, and the energy-saving and emission-reduction of using the field are had obvious effects.
Below only be concrete exemplary applications of the present utility model, protection domain of the present utility model is not constituted any limitation.In addition to the implementation, the utility model can also have other embodiment.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop within the utility model scope required for protection.

Claims (6)

1. velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm, it is characterized in that: comprise the mutually disjoint hot line array (1) that is arranged in by some hot wire silks (2), described hot wire silk (2) is arranged in the pipeline (9), described hot line array (1) periphery is connected with the control circuit (3) and the metering circuit of control hot wire silk (2) constant temperature or constant current, the measuring-signal that described metering circuit obtains is through signal processing circuit (6), A/D conversion circuit (7) back 2-d reconstruction algorithm process by special purpose model in data processing module (8) obtains the velocity field data, and calculates actual flow according to this.
2. the velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm according to claim 1 is characterized in that: described hot line array (1) can be mutually disjoint longitudinal and transverse array.
3. the velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm according to claim 1 is characterized in that: described hot wire silk (2) is thermally sensitive resistance.
4. the velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm according to claim 1 is characterized in that: described metering circuit is a digitizing zeroing bridge diagram (4).
5. the velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm according to claim 4 is characterized in that: described digitizing zeroing bridge diagram (4) is connected with temperature-compensation circuit (5).
6. the velocity field measuring system based on hot line array and intelligent 2-d reconstruction algorithm according to claim 1 is characterized in that: described control circuit (3) is a closed loop circuit, and has indirect compensate function.
CN2010201428540U 2010-03-23 2010-03-23 Flow-velocity-field measuring system based on hotline array and intelligent two-dimensional reconstruction algorithm Expired - Fee Related CN201637445U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102735294A (en) * 2011-04-02 2012-10-17 苏州科技学院 Measuring method for wind speed field measurement device based on infrared focal planes and reconstruction technique
CN103592461A (en) * 2013-10-31 2014-02-19 清华大学 Two-dimensional flow velocity vector measurement sensor, manufacturing method thereof and signal processing method
CN105699687A (en) * 2016-01-22 2016-06-22 北京至感传感器技术研究院有限公司 Wind speed and direction detection device
CN110261641A (en) * 2019-06-25 2019-09-20 中国工程物理研究院材料研究所 A kind of hot type micro-flowmeter signal processing circuit of achievable response time compensation

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102735294A (en) * 2011-04-02 2012-10-17 苏州科技学院 Measuring method for wind speed field measurement device based on infrared focal planes and reconstruction technique
CN103592461A (en) * 2013-10-31 2014-02-19 清华大学 Two-dimensional flow velocity vector measurement sensor, manufacturing method thereof and signal processing method
CN105699687A (en) * 2016-01-22 2016-06-22 北京至感传感器技术研究院有限公司 Wind speed and direction detection device
CN110261641A (en) * 2019-06-25 2019-09-20 中国工程物理研究院材料研究所 A kind of hot type micro-flowmeter signal processing circuit of achievable response time compensation
CN110261641B (en) * 2019-06-25 2021-09-10 中国工程物理研究院材料研究所 Thermal type micro-flow meter signal processing circuit capable of realizing response time compensation

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Granted publication date: 20101117

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