JP2013003052A  Threedimensional velocity measuring system  Google Patents
Threedimensional velocity measuring system Download PDFInfo
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 JP2013003052A JP2013003052A JP2011136625A JP2011136625A JP2013003052A JP 2013003052 A JP2013003052 A JP 2013003052A JP 2011136625 A JP2011136625 A JP 2011136625A JP 2011136625 A JP2011136625 A JP 2011136625A JP 2013003052 A JP2013003052 A JP 2013003052A
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 238000007781 preprocessing Methods 0.000 claims description 21
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 238000005259 measurement Methods 0.000 abstract 10
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Abstract
A sensor section having an upstream sensor section 2A disposed in the middle of a flow path 1 and a downstream sensor section 2B disposed downstream of a fluid 1 corresponding to the upstream sensor section 2A; The crosscorrelation coefficient is maximized by taking the crosscorrelation between the measurement signal related to the specific measurement point of the upstream sensor unit 2A and the measurement signal measured at the measurement point included in the predetermined region of the downstream sensor unit 2B. To identify the downstream measurement points where each crosscorrelation coefficient is maximized by taking the crosscorrelation count for each of the upstream measurement points. And an arithmetic processing unit 3 that calculates the threedimensional flow velocity of the bubble B passing through the measurement point and reaching each downstream measurement point.
[Selection] Figure 1
Description
A sensor unit that sends out an output signal that is a measurement signal that reflects the impedance of the measurement target flowing through the flow path;
Computation processing means for processing the output signal and measuring the speed of the measurement object,
The sensor unit is
An upstream sensor section for sending an upstream output signal representing the impedance of the measurement object at upstream measurement points arranged at a plurality of positions in a plane in the flow of the measurement object in the flow path;
A downstream output signal representing the impedance of the measurement target at a plurality of downstream measurement points arranged in correspondence with the upstream measurement point in another surface similar to the surface on the downstream side in the fluid flow direction is transmitted. While having a downstream sensor portion to
The arithmetic processing means calculates a crosscorrelation between the upstream measurement signal related to the specific upstream measurement point and the downstream output signal measured at the downstream measurement point included in a predetermined region of the downstream sensor. The downstream measurement point where the crosscorrelation coefficient is maximized by taking the crosscorrelation coefficient for each of the upstream measurement points and the downstream measurement point where the crosscorrelation coefficient is maximized Each of the threedimensional velocities of the threedimensional velocity, characterized in that each of the threedimensional velocity of the measurement object passing through the upstream measurement points and reaching the downstream measurement points is calculated. In the measurement system.
In the threedimensional velocity measurement system described in the first aspect,
In the threedimensional velocity measurement system, the upstream sensor unit and the downstream sensor unit are constituted by wire mesh sensors.
In the threedimensional velocity measurement system described in the first or second aspect,
The arithmetic processing means includes:
A time difference between a component corresponding to the specific upstream measurement point in the upstream output signal and a component corresponding to the downstream measurement point at which the crosscorrelation coefficient in the downstream output signal is maximized;
The downstream side where the crosscorrelation coefficient is maximized from the distance along the axial direction between the upstream sensor unit and the downstream sensor unit and the coordinates of the downstream measurement point corresponding to the specific upstream measurement point Based on the distance in the plane to the coordinates of the measurement point, calculate the distance between the specific upstream measurement point and the downstream measurement point where the crosscorrelation coefficient is maximized,
The threedimensional velocity measurement system is characterized in that a threedimensional flow velocity of the measurement object is calculated based on the time difference and the distance.
In the threedimensional velocity measurement system according to any one of the first to third aspects,
The arithmetic processing means discriminates the upstream output signal and the downstream output signal for each predetermined frequency band, and generates a plurality of the upstream output signal and the downstream output signal for each of a plurality of frequency bands; ,
A threedimensional velocity measurement system comprising: an arithmetic processing unit that processes the upstream output signal and the downstream output signal for each frequency band generated by the preprocessing unit. .
In the threedimensional velocity measurement system according to any one of the first to third aspects,
The arithmetic processing means calculates the measurement object based on time series data of the upstream output signal and the downstream output signal within a predetermined range within the plane within a predetermined time and a distance between the upstream sensor unit and the downstream sensor unit. A preprocessing unit that discriminates each volume and generates a plurality of the upstream output signals and the downstream output signals for each of a plurality of volumes;
The threedimensional velocity measurement system includes an arithmetic processing unit that processes the upstream output signal and the downstream output signal for each volume generated by the preprocessing unit.
In the threedimensional velocity measurement system described in the fourth aspect,
In the threedimensional velocity measurement system, the preprocessing unit performs wavelet analysis of the upstream output signal and the downstream output signal.
In the threedimensional velocity measurement system according to any one of the fourth to sixth aspects,
The preprocessing unit is configured to send the upstream output signal and the downstream output signal to the arithmetic processing unit based on a measurement target having a relative speed difference with the liquid phase of 2 to 5 cm / sec. It is in the threedimensional velocity measurement system.
In the threedimensional velocity measurement system according to any one of the first to seventh aspects,
The arithmetic processing means detects a moving direction of each measurement target in the plane based on the inplane direction component of the threedimensional flow velocity of each measurement target, and displays the behavior of the measurement target within a predetermined time on the display unit. The threedimensional velocity measurement system is characterized by being visualized and displayed.
FIG. 6 is an explanatory diagram showing the first embodiment. As shown in the figure, in this embodiment, a large number of downstream sensor units 2B,..., 2N are arranged in the axial direction of the flow path 1 with respect to the upstream sensor unit 2A.
FIG. 7 is an explanatory view showing a second embodiment. As shown in the figure, the flow path in which the sensor unit is disposed may be a curved pipe (elbow pipe) 1A. Even in this case, by processing the output signals of the upstream sensor unit 2A and the downstream sensor units 2B, 2C, 2D, 2E, 2F, and 2G as described above, the upstream sensor units 2A and the downstream sensor units 2B to 2B are processed. The threedimensional flow velocity of the bubble B at each measurement point of 2G can be obtained, and thereby the moving direction of the bubble B can be traced. Incidentally, the speed of the bubbles in this case cannot be detected by the conventional technique that processes only onedimensional information set in the axial direction of the flow path 1A.
FIG. 8 is an explanatory view showing a third embodiment. As shown in the figure, this example is a case where the flow path 1B has a reducer portion. Even if the plate area of the flow path 1B changes, if the area of the downstream sensor unit 2B is changed with respect to the area of the upstream sensor unit 2A, desired measurement can be performed without any problem. Specifically, the WMS mesh interval may be changed.
FIG. 9 is an explanatory view showing a fourth embodiment. This figure shows a case where an orifice (obstacle) 8 exists between the upstream sensor unit 2A and the downstream sensor unit 2B. Even in this case, the desired threedimensional flow velocity of the bubble B can be detected without any problem. Incidentally, the bubble velocity in this case cannot be detected by the conventional technique that processes only onedimensional information related to the axial direction of the flow path 1.
FIG. 10 is an explanatory diagram showing the fifth embodiment. As shown in the figure, the locus 9 of the bubble B accompanying the convection of the fluid between the upstream sensor unit 2A and the downstream sensor unit 2B can be traced as shown in the present embodiment. Incidentally, the speed of the bubbles in this case cannot be detected by the conventional technique that processes only onedimensional information about the axial direction in the flow path 1.
Claims (8)
 A sensor unit that sends out an output signal that is a measurement signal that reflects the impedance of the measurement target flowing through the flow path;
Computation processing means for processing the output signal and measuring the speed of the measurement object,
The sensor unit is
An upstream sensor section for sending an upstream output signal representing the impedance of the measurement object at upstream measurement points arranged at a plurality of positions in a plane in the flow of the measurement object in the flow path;
A downstream output signal representing the impedance of the measurement target at a plurality of downstream measurement points arranged in correspondence with the upstream measurement point in another surface similar to the surface on the downstream side in the fluid flow direction is transmitted. While having a downstream sensor portion to
The arithmetic processing means calculates a crosscorrelation between the upstream measurement signal related to the specific upstream measurement point and the downstream output signal measured at the downstream measurement point included in a predetermined region of the downstream sensor. The downstream measurement point where the crosscorrelation coefficient is maximized by taking the crosscorrelation coefficient for each of the upstream measurement points and the downstream measurement point where the crosscorrelation coefficient is maximized Each of the threedimensional velocities of the threedimensional velocity, characterized in that each of the threedimensional velocity of the measurement object passing through the upstream measurement points and reaching the downstream measurement points is calculated. Measuring system.  The threedimensional velocity measurement system according to claim 1,
The threedimensional velocity measurement system, wherein the upstream sensor unit and the downstream sensor unit are constituted by wire mesh sensors.  In the threedimensional velocity measurement system according to claim 1 or 2,
The arithmetic processing means includes:
A time difference between a component corresponding to the specific upstream measurement point in the upstream output signal and a component corresponding to the downstream measurement point at which the crosscorrelation coefficient in the downstream output signal is maximized;
The downstream side where the crosscorrelation coefficient is maximized from the distance along the axial direction between the upstream sensor unit and the downstream sensor unit and the coordinates of the downstream measurement point corresponding to the specific upstream measurement point Based on the distance in the plane to the coordinates of the measurement point, calculate the distance between the specific upstream measurement point and the downstream measurement point where the crosscorrelation coefficient is maximized,
A threedimensional velocity measurement system that calculates a threedimensional flow velocity of the measurement object based on the time difference and the distance.  In the threedimensional velocity measurement system according to any one of claims 1 to 3,
The arithmetic processing means discriminates the upstream output signal and the downstream output signal for each predetermined frequency band, and generates a plurality of the upstream output signal and the downstream output signal for each of a plurality of frequency bands; ,
A threedimensional velocity measurement system comprising: an arithmetic processing unit that processes the upstream output signal and the downstream output signal for each frequency band generated by the preprocessing unit.  In the threedimensional velocity measurement system according to any one of claims 1 to 3,
The arithmetic processing means calculates the measurement object based on time series data of the upstream output signal and the downstream output signal within a predetermined range within the plane within a predetermined time and a distance between the upstream sensor unit and the downstream sensor unit. A preprocessing unit that discriminates each volume and generates a plurality of the upstream output signals and the downstream output signals for each of a plurality of volumes;
A threedimensional velocity measurement system comprising: an arithmetic processing unit that processes the upstream output signal and the downstream output signal for each volume generated by the preprocessing unit.  In the threedimensional velocity measurement system according to claim 4,
The threedimensional velocity measurement system, wherein the preprocessing unit performs wavelet analysis of the upstream output signal and the downstream output signal.  In the threedimensional velocity measurement system according to any one of claims 4 to 6,
The preprocessing unit is configured to send the upstream output signal and the downstream output signal to the arithmetic processing unit based on a measurement target having a relative speed difference with the liquid phase of 2 to 5 cm / sec. Threedimensional velocity measurement system.  In the threedimensional velocity measurement system according to any one of claims 1 to 7,
The arithmetic processing means detects a moving direction of each measurement target in the plane based on the inplane direction component of the threedimensional flow velocity of each measurement target, and displays the behavior of the measurement target within a predetermined time on the display unit. A threedimensional velocity measurement system characterized by being visualized and displayed.
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CN107219376A (en) *  20170527  20170929  华北电力大学  A kind of crosscorrelation speedmeasuring method of adaption object kinetic characteristic 
Citations (4)
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JPS59195163A (en) *  19830421  19841106  Mitsubishi Heavy Ind Ltd  Measuring device of flow field 
JP2001056342A (en) *  19990819  20010227  Kiyoyuki Horii  Method for processing tomography image through use of wavelet transformation and its device 
JP2002214183A (en) *  20010119  20020731  Univ Nihon  Multiphase state distribution measuring device and multiphase state distribution measuring method 
JP2004333237A (en) *  20030502  20041125  Univ Nihon  Measuring apparatus and measurement method for flow velocity/flow rate of mixed flow 

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JPS59195163A (en) *  19830421  19841106  Mitsubishi Heavy Ind Ltd  Measuring device of flow field 
JP2001056342A (en) *  19990819  20010227  Kiyoyuki Horii  Method for processing tomography image through use of wavelet transformation and its device 
JP2002214183A (en) *  20010119  20020731  Univ Nihon  Multiphase state distribution measuring device and multiphase state distribution measuring method 
JP2004333237A (en) *  20030502  20041125  Univ Nihon  Measuring apparatus and measurement method for flow velocity/flow rate of mixed flow 
NonPatent Citations (2)
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JPN6015018115; Ｄ． Ｈｏｐｐｅ ｅｔ ａｌ: '"Ｄｅｔｅｒｍｉｎａｔｉｏｎ ｏｆ ｖｅｌｏｃｉｔｙ ａｎｄ ａｎｇｕｌａｒ ｄｉｓｐｌａｃｅｍｅｎｔ ｏｆ ｂｕｂｂｌｙ ｆｌｏｗｓ ｂｙ ｍｅａｎｓ ｏｆ ｗｉｒｅｍｅｓｈ ｓｅｎｓｏｒｓ ａｎ' Ｆｌｏｗ Ｍｅａｓｕｒｅｍｅｎｔ ａｎｄ Ｉｎｓｔｒｕｍｅｎｔａｔｉｏｎ Ｖｏｌ．２１， Ｎｏ．１, 201003, ｐ．４８５３ * 
JPN6015018118; Ｓ． Ｌｉｕ ｅｔ ａｌ: '"Ｅｌｅｃｔｒｉｃａｌ ｃａｐａｃｉｔａｎｃｅ ｔｏｍｏｇｒａｐｈｙ ｆｏｒ ｇａｓｓｏｌｉｄｓ ｆｌｏｗ ｍｅａｓｕｒｅｍｅｎｔ ｆｏｒ ｃｉｒｃｕｌａｔｉｎｇ ｆｌｕｉｄｉｚｅｄ ｂｅｄｓ"' Ｆｌｏｗ Ｍｅａｓｕｒｅｍｅｎｔ ａｎｄ Ｉｎｓｔｒｕｍｅｎｔａｔｉｏｎ Ｖｏｌ．１６， Ｎｏ．２３, 200504, ｐ．１３５１４４ * 
Cited By (1)
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CN107219376A (en) *  20170527  20170929  华北电力大学  A kind of crosscorrelation speedmeasuring method of adaption object kinetic characteristic 
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