CN113375901B - Vortex street frequency and inter-tube flow velocity testing method for tube bundle structure flow induced vibration - Google Patents
Vortex street frequency and inter-tube flow velocity testing method for tube bundle structure flow induced vibration Download PDFInfo
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- CN113375901B CN113375901B CN202110528750.6A CN202110528750A CN113375901B CN 113375901 B CN113375901 B CN 113375901B CN 202110528750 A CN202110528750 A CN 202110528750A CN 113375901 B CN113375901 B CN 113375901B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/32—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow using swirl flowmeters
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a vortex street frequency and inter-tube flow velocity testing method for flow-induced vibration of a tube bundle structure. The differential pressure test method is simple in principle, no electronic device is arranged in the sensor, the sensor is suitable for various complex environment tests, the sensor manufacturing cost is low, other random errors can be eliminated, the accuracy of test results is ensured, the defects that the vortex separation point of the tube bundle flowing around changes along with the flow speed and the tube bundle arrangement changes can be overcome, the test method has test universality, and the method can be widely popularized and applied. The test method can accurately obtain vortex shedding frequency and flow velocity among pipes, and is corresponding to theoretical vortex street frequency, so that whether vortex street frequency occurs in a flow induced vibration test of the tube bundle structure is effectively judged.
Description
Technical Field
The invention belongs to the field of tube bundle structure flow induced vibration test, and particularly relates to a vortex street frequency and inter-tube flow velocity test method for tube bundle structure flow induced vibration.
Background
Currently, in the industry, there are two main methods for vortex street frequency measurement:
in the first method, a thermosensitive element is arranged in a sensor, when vortex is generated, the pressure difference action promotes fluid to move to a resistance wire, and the change frequency of a resistance value corresponds to the vortex frequency when the fluid flows, so that the vortex street frequency is obtained;
in the second method, a sensor is internally provided with a metal film to form a capacitor, the capacitance is changed when the lift force of vortex is changed, and vortex street frequency is obtained according to the change frequency of the capacitor.
In the two methods, although the measurement sensitivity is higher, the vortex street flow sensor belongs to a precise component, the built-in electronic element of the sensor has a complex internal structure, long-term underwater measurement is acted, the packaging and manufacturing cost of the electronic element in the sensor are high, the single cost is high, the popularization and the application are not facilitated, and meanwhile, the built-in electronic element has a fine structure and is easily influenced by impurities in fluid.
Therefore, in consideration of the above factors, it is possible to design a test method that can effectively reduce the measurement cost on the premise of ensuring the measurement accuracy.
Disclosure of Invention
According to the vortex street frequency and flow velocity testing method between tubes of the tube bundle structure flow induced vibration, according to the principle that pressure on two sides of a measuring tube generates alternating change when the surface of the measuring tube generates alternating shedding vortex, the vortex shedding frequency is obtained by testing the pressure difference change frequency of vortex shedding areas on two sides of the tube. By utilizing the principle, the vortex street frequency and flow can be tested by adopting the vortex street flow sensor with a mechanical structure.
The technical scheme of the invention is as follows:
a vortex street frequency and flow velocity test method between tubes of tube bundle structure flow induced vibration is characterized by comprising the following steps:
selecting a plurality of test tubes on a tube bundle structure serving as a test piece, judging and selecting a region with a larger flow speed according to a fluid simulation result and experience of the earlier tube bundle structure, and carrying out layout of vortex street flow sensors; selecting an inlet and outlet of the tube bundle structure and a V-shaped turning as measuring points; because the flow velocity between the pipes at the inlet and outlet of the general pipe bundle structure is large, the direction of fluid at the V-shaped turning is changed, vortex street frequency is easy to appear, and the V-shaped turning is suitable for being used as a measuring point;
step two, cutting the test tube along the radial direction at the vortex street frequency measuring point, mounting the vortex street flow sensor at the cut of the test tube, and connecting the two ends of the vortex street flow sensor with the two cuts of the test tube respectively;
thirdly, punching three pressure guiding holes in the pipe wall of the same circumferential section of the test pipe, wherein the three pressure guiding pipes in the test pipe are respectively connected with the three pressure guiding holes and used for measuring the flow velocity among the pipes;
step four, leading out the capillary pressure guiding pipe connected with the vortex street flow sensor and the pressure guiding pipe connected with the pressure guiding hole from the inner end part of the test pipe, wherein the pressure guiding pipes are respectively connected with an external differential pressure transmitter and a differential pressure sensor through connectors, the differential pressure transmitter is used for testing the flow velocity between pipes, and the differential pressure sensor is used for acquiring vortex street frequency;
step five, after the tube bundle structure with test tubes is integrally assembled, continuously adding water pressure to test the tightness of the connector, and simultaneously connecting a differential pressure transmitter and a differential pressure sensor to a data acquisition analyzer to test whether a fluid pressure signal is normal;
step six, when the sealing effect of the connector reaches the expected effect and the fluid pressure signal is tested normally, placing a test piece on a test bench, connecting a water circulation system, then performing formal fluid pressure signal acquisition work, performing tube bundle structure flow induced vibration test under different flow speeds, acquiring the fluid pressure of each impulse tube in real time, wherein the single acquisition time is at least 5min, and the repetition times of each working condition are at least 5 times;
and step seven, after the test is finished, analyzing and processing data to obtain vortex shedding frequency of the tube bundle structure and flow velocity data among the tubes, and judging whether theoretical vortex street frequency of the tube bundle structure occurs at a certain flow velocity.
For the above test method, further the following is:
the vortex street flow sensor needs to be customized according to the pipe diameter of the test pipe, and the appearance of the sensor is cylindrical with the same size as the test pipe diameter.
In the second step, when the vortex street flow sensor is installed at the measuring point, the corresponding position of the test tube is firstly cut off, then the two cut-off parts of the test tube are respectively connected with the mounting base, and the two ends of the vortex street flow sensor are connected with the mounting base, so that the installation operation of the vortex street flow sensor is completed.
The vortex street flow sensor is provided with a plurality of capillary pressure guiding pipes for collecting and analyzing pressure signals, and the pressure guiding pipes are connected and then all need to be sealed, so that the accuracy of the pressure signals in formal test is ensured.
In the third step, the positions of the three pressure guiding holes are adjacent to the mounting position of the sensor and are positioned on the same circumferential section of the test tube, the middle holes face the incoming flow direction, and the test speed direction is perpendicular to the test tube direction. The three pressure guiding holes are respectively a pressure guiding hole 0, a pressure guiding hole 1 and a pressure guiding hole 2, and are respectively connected with three pressure guiding pipes P0, P1 and P2, wherein the pressure guiding pipe P0 is centered and opposite to the incoming flow direction, the pressure guiding pipes P1 and P2 are symmetrical and respectively form an angle of 45 degrees with the pressure guiding pipe P0, and the pressure guiding pipes P1 and P2 form an angle of 90 degrees.
In the fourth step, in order to ensure the accuracy of fluid pressure measurement, the pressure difference change condition is obtained in real time, the length D of the impulse pipe is not suitable to be too long, and the value range of D is as follows: d is more than 0 and less than or equal to 2m.
In the sixth step, the working conditions comprise working conditions with the rated flow rate of 100% and further comprise step-level working conditions with the flow rates of 20%, 50%, 75%, 125%, 150%, 175% and 200%.
In the seventh step, firstly, the pressure value of the pressure guiding holes on the pipe wall is obtained through a signal acquisition system, the flow velocity between the pipes is obtained through calculation, secondly, the fluid pressure change signal of the capillary pressure guiding pipe in the vortex street flow sensor is analyzed, the change frequency of the pressure difference of vortex shedding areas at two sides of the pipe, namely the vortex shedding frequency, is obtained, and finally, the calculated theoretical vortex street frequency is compared, and whether the vortex street frequency appears in the flow induced vibration test is judged.
The velocity described in step seven is calculated by the following formula (1),
where v denotes the incoming flow direction velocity, P0 and P1 denote the in-line pressures of the impulse pipes P0 and P1, respectively, k denotes the correction coefficient, and ρ denotes the fluid density.
The flow rate values between the tubes are related to the lateral flow rate and the tube bundle arrangement, and for the regular triangle arrangement tube bundle, the flow rate between the tubes is calculated as shown in the following formula (2).
Wherein P represents the center distance of the pipes, V 0 Represents the lateral flow velocity and d represents the test tube outside diameter.
According to the Karman vortex street generation principle and the characteristics of the pulsating lift frequency, the Karman vortex street frequency can be obtained as long as the change frequency of the pulsating pressure is tested, namely, the pressure time domain data acquired by the differential pressure sensor is subjected to frequency spectrum analysis to obtain a frequency domain signal. The judgment condition refers to a Karman vortex street theoretical calculation formula recommended by national standard GB/T151-2014 heat exchanger, and the formula is shown in (3).
Wherein f represents vortex street frequency, S t For the Stlahaar number, V is the inter-tube flow rate and d is the test tube outer diameter, depending on the geometry of the flow-around object.
Before the sensor is used, the sensor is subjected to debugging and calibration through a water loop system to confirm that the design requirement is met and the sensor parameters are adjusted to the optimal performance according to the debugging result, the vortex street frequency test range of the test method is 6-30Hz, and the flow rate test range between pipes is 0.5-2m/s.
The vortex street flow sensor is designed according to the change of the two side pressures of the test tube when the alternative shedding vortex is generated, has simple principle and structure, is different from the common vortex street frequency measuring instrument in the market, has low manufacturing cost, can eliminate random errors by adopting a differential pressure measuring method, and has high test accuracy.
The beneficial effects of the invention are as follows:
(1) According to the invention, the vortex street flow sensor is directly butted in the middle by cutting off the test tube, the vortex street frequency is indirectly obtained by utilizing the pressure difference change frequency when the vortex is measured, the test method has high innovation and obvious test effect;
(2) The invention can realize the function of stably controlling the vortex shedding alternately at the two sides of the vortex street flow sensor, overcomes the defect that the vortex separation point of the tube bundle flowing around changes along with the change of the flow speed and the arrangement of the tube bundle, and has test universality;
(3) The differential pressure type measuring method can eliminate random interference and has high accuracy;
(4) Compared with the traditional vortex street flow sensor, the internal structure of the vortex street flow sensor is simpler, no electronic device is needed to be arranged in the vortex street flow sensor, the application range is wide, the manufacturing and testing cost is low, and the vortex street flow sensor is easy to popularize and apply.
Drawings
FIG. 1 is a flow chart of the test in the present invention.
FIG. 2 is a schematic diagram of the layout of the vortex street flow sensor of the present invention.
FIG. 3 is a schematic view of the installation of the vortex street flow sensor of the present invention.
FIG. 4 is a schematic diagram of the flow rate test between pipes in the present invention.
FIG. 5 is a schematic diagram of a suitable matching test system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in FIG. 1, the method for testing vortex street frequency and flow velocity between pipes by flow induced vibration of a pipe bundle structure comprises the following specific steps:
selecting a plurality of test tubes on a tube bundle structure serving as a test piece, judging and selecting a region with a larger flow speed according to a fluid simulation result and experience of the earlier tube bundle structure, and carrying out layout of vortex street flow sensors; the flow velocity between the tubes at the inlet and outlet of the general tube bundle structure is large, the direction of fluid at the V-shaped turning is changed, vortex street frequency is easy to appear, and the flow velocity is suitable for being used as a measuring point; FIG. 2 shows a typical measurement point placement where one side is located at the entrance to the tube bundle and the other is located at the V-bend;
step two, cutting the test tube along the radial direction at the vortex street frequency measuring point, mounting the vortex street flow sensor at the cut of the test tube, and connecting the two ends of the vortex street flow sensor with the two cuts of the test tube respectively;
thirdly, punching three pressure guiding holes in the pipe wall of the same circumferential section of the test pipe, wherein the three pressure guiding pipes in the test pipe are respectively connected with the three pressure guiding holes and used for measuring the flow velocity among the pipes;
in this embodiment, the vortex street flow sensor needs to be customized according to the pipe diameter of the test pipe, as shown in fig. 3, and the sensor shape should be cylindrical with the same size as the test pipe diameter.
The vortex street sensor is actually provided with five capillary pressure guiding pipes which are respectively connected with the five pressure guiding pipes in the test tube. Furthermore, three pressure guiding holes are drilled on the pipe wall of the same circumferential section of the test pipe, and the three pressure guiding pipes in the test pipe are respectively connected with the three pressure guiding holes. The three pressure guiding holes are adjacent to the sensor mounting position, and the testing speed direction is perpendicular to the testing tube direction.
After the vortex street flow sensor is installed and connected, the pressure guide pipe is subjected to waterproof sealing treatment; the sensor installation schematic diagram is shown in fig. 3, and particularly when the vortex street flow sensor is installed at a measuring point, the corresponding position of the test tube is firstly required to be cut off, then the two cut-off parts of the test tube are respectively connected with the installation seat, the upper end of the sensor is connected with the installation seat in an interference fit manner, the set screw is fixed, and the lower end of the sensor is in threaded connection with the installation seat.
The flow velocity measurement principle between pipes is shown in fig. 4, the three pressure guiding holes are respectively a pressure guiding hole 0, a pressure guiding hole 1 and a pressure guiding hole 2, and are respectively connected with three pressure guiding pipes P0, P1 and P2, wherein the pressure guiding pipe P0 is centered and opposite to the incoming flow direction, the pressure guiding pipes P1 and P2 are symmetrical and respectively form an angle of 45 degrees with the pressure guiding pipe P0, and the pressure guiding pipes P1 and P2 form an angle of 90 degrees.
And step four, leading out the capillary pressure guiding pipes connected with the vortex street flow sensor and the pressure guiding pipes connected with the pressure guiding holes from the end parts of the test pipes, wherein the pressure guiding pipes are respectively connected with an external differential pressure transmitter and a differential pressure sensor through connectors, the differential pressure transmitter is used for testing the flow velocity between the pipes, and the differential pressure sensor is used for testing the vortex street frequency. In order to ensure the accuracy of fluid pressure measurement, the pressure difference change condition is obtained in real time, and the length of the pressure guide pipe is not suitable to be too long, and is at most 2m;
step five, after the tube bundle structure with test tubes is integrally assembled, continuously adding water pressure to test the tightness of the connector, and simultaneously connecting a differential pressure transmitter and a differential pressure sensor to a data acquisition analyzer to test whether a fluid pressure signal is normal;
step six, when the sealing effect of the connector reaches the expected effect and the fluid pressure signal is tested normally, placing a test piece on a test bench, connecting a water circulation system, then performing formal fluid pressure signal acquisition work, performing tube bundle structure flow induced vibration test under different flow speeds, acquiring the fluid pressure of each impulse tube in real time, wherein the single acquisition time is at least 5min, and the repetition times of each working condition are at least 5 times;
as shown in FIG. 5, the test system is suitable for vortex street frequency and flow velocity test method between pipes of flow induced vibration of a pipe bundle structure. During the test, the tube bundle structure is located in the closed pressure vessel, the inlet and outlet of the pressure vessel is connected with an external water circulation system, the vortex street flow sensor is arranged on a test tube in the tube bundle structure and connected to the external sensor through a pressure guiding tube and a connector, and then pressure data are analyzed through a computer and a data acquisition instrument and used for obtaining flow velocity and vortex street frequency between the tubes.
Step seven, firstly, obtaining the pressure value of a pressure guiding hole on the pipe wall through a signal acquisition system, and calculating to obtain the flow velocity between pipes according to formulas (1) and (2); secondly, analyzing a fluid pressure change signal of a capillary pressure guiding tube in the vortex street flow sensor, namely performing frequency spectrum analysis on pressure time domain data acquired by a differential pressure sensor to obtain a frequency domain signal, and obtaining a change frequency of a differential pressure of vortex shedding areas at two sides of the tube, namely a vortex shedding frequency; and then calculating theoretical karman vortex street frequency by using a formula (3) according to parameters such as flow velocity among pipes, arrangement mode of the pipe bundles, structural size and the like, and finally comparing the vortex shedding frequency of the pipe bundle structure obtained by the experiment with flow velocity data to judge whether the theoretical vortex street frequency occurs in the pipe bundle structure at a certain flow velocity.
Before the sensor is used, the sensor is subjected to debugging and calibration through a water loop system so as to confirm that the design requirement is met and adjust the sensor parameters to the optimal performance according to the debugging result.
Through debugging and calibration, the vortex street frequency test range of the test method is 6-30Hz, and the flow velocity test range between pipes is 0.5-2m/s.
Claims (9)
1. A vortex street frequency and flow velocity test method between tubes of tube bundle structure flow induced vibration is characterized by comprising the following steps:
selecting a plurality of test tubes on a tube bundle structure serving as a test piece, judging and selecting a region with a larger flow speed according to a fluid simulation result and experience of the earlier tube bundle structure, and carrying out layout of vortex street flow sensors; selecting an inlet and outlet of the tube bundle structure and a V-shaped turning as measuring points;
step two, cutting the test tube along the radial direction at the vortex street frequency measuring point, mounting the vortex street flow sensor at the cut of the test tube, and connecting the two ends of the vortex street flow sensor with the two cuts of the test tube respectively;
thirdly, punching three pressure guiding holes in the pipe wall of the same circumferential section of the test pipe, wherein the three pressure guiding pipes in the test pipe are respectively connected with the three pressure guiding holes and used for measuring the flow velocity among the pipes;
step four, leading out the capillary pressure guiding pipe connected with the vortex street flow sensor and the pressure guiding pipe connected with the pressure guiding hole from the inner end part of the test pipe, wherein the pressure guiding pipes are respectively connected with an external differential pressure transmitter and a differential pressure sensor through connectors, the differential pressure transmitter is used for testing the flow velocity between pipes, and the differential pressure sensor is used for acquiring vortex street frequency;
step five, after the tube bundle structure with test tubes is integrally assembled, continuously adding water pressure to test the tightness of the connector, and simultaneously connecting a differential pressure transmitter and a differential pressure sensor to a data acquisition analyzer to test whether a fluid pressure signal is normal;
step six, when the sealing effect of the connector reaches the expected effect and the fluid pressure signal is tested normally, placing a test piece on a test bench, connecting a water circulation system, then performing formal fluid pressure signal acquisition work, performing tube bundle structure flow induced vibration test under different flow speeds, acquiring the fluid pressure of each impulse tube in real time, wherein the single acquisition time is at least 5min, and the repetition times of each working condition are at least 5 times;
step seven, after the test is finished, firstly obtaining the pressure value of the pressure guiding hole on the pipe wall through a signal acquisition system, calculating according to formulas (1) and (2) to obtain the flow velocity between the pipes, secondly analyzing the fluid pressure change signal of the capillary pressure guiding pipe in the vortex street flow sensor to obtain the change frequency of the pressure difference of the vortex shedding area at the two sides of the pipe, namely the vortex shedding frequency, and finally comparing the change frequency with the theoretical vortex street frequency calculated by using the formula (3) to judge whether the theoretical vortex street frequency appears in the flow induced vibration test;
wherein, formula (1) is:
wherein v represents the incoming flow direction speed, P0 and P1 represent the in-pipe pressures of the impulse pipe P0 and the impulse pipe P1 respectively, k represents the correction coefficient, and ρ represents the fluid density;
the flow rate values among the tubes are related to the transverse flow rate and the tube bundle arrangement mode, and for the regular triangle arranged tube bundle, the flow rate formula (2) among the tubes is as follows:
wherein P represents the center distance of the pipes, V 0 Represents the lateral flow velocity, d represents the test tube outer diameter;
the karman vortex street theoretical calculation formula is shown as (3):
wherein f represents vortex street frequency, S t For the Stlahaar number, V is the inter-tube flow rate and d is the test tube outer diameter, depending on the geometry of the flow-around object.
2. The method for testing vortex street frequency and flow velocity between tubes of a tube bundle structure flow induced vibration according to claim 1, wherein the method comprises the following steps: the vortex street flow sensor needs to be customized according to the pipe diameter of the test pipe, and the appearance of the sensor is cylindrical with the same size as the test pipe diameter.
3. The method for testing vortex shedding frequency and flow velocity between tubes of a tube bundle structure flow induced vibration according to claim 1 or 2, wherein the method comprises the following steps: in the second step, when the vortex street flow sensor is installed at the measuring point, the corresponding position of the test tube is firstly cut off, then the two cut-off parts of the test tube are respectively connected with the mounting base, and the two ends of the vortex street flow sensor are connected with the mounting base, so that the installation operation of the vortex street flow sensor is completed.
4. The method for testing vortex street frequency and flow velocity between tubes of a tube bundle structure flow induced vibration according to claim 1, wherein the method comprises the following steps: the vortex street flow sensor is provided with a plurality of capillary pressure guiding pipes for collecting and analyzing pressure signals, and the pressure guiding pipes are connected and then all need to be sealed, so that the accuracy of the pressure signals in formal test is ensured.
5. The method for testing vortex street frequency and flow velocity between tubes of a tube bundle structure flow induced vibration according to claim 1, wherein the method comprises the following steps: in the third step, the positions of the three pressure guiding holes are adjacent to the mounting position of the sensor and are positioned on the same circumferential section of the test tube, the middle holes face the incoming flow direction, and the test speed direction is perpendicular to the test tube direction.
6. The method for testing vortex street frequency and flow velocity between tubes of a tube bundle structure flow induced vibration according to claim 1, wherein the method comprises the following steps: the length of the impulse pipe is D, and the value range of D is as follows: d is more than 0 and less than or equal to 2m.
7. The method for testing vortex street frequency and flow velocity between tubes of a tube bundle structure flow induced vibration according to claim 1, wherein the method comprises the following steps: in the sixth step, the working conditions include working conditions with the rated flow rate of 100% and further include step-level working conditions with the flow rate of 20%, 50%, 75%, 125%, 150%, 175% or 200%.
8. The method for testing vortex street frequency and flow velocity between tubes of a tube bundle structure flow induced vibration according to claim 1, wherein the method comprises the following steps: before the sensor is used, the sensor is subjected to debugging and calibration through a water loop system so as to confirm that the design requirement is met and adjust the sensor parameters to the optimal performance according to the debugging result.
9. The method for testing vortex street frequency and flow velocity between tubes of a tube bundle structure flow induced vibration according to claim 1, wherein the method comprises the following steps: the vortex street frequency test range of the test method is 6-30Hz, and the flow velocity test range between pipes is 0.5-2m/s.
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| CN1673689A (en) * | 2005-04-22 | 2005-09-28 | 浙江大学 | Pipe wall differential pressure type vortex frequency detecting method and apparatus for vortex street flowmeter |
| CN201508201U (en) * | 2009-09-21 | 2010-06-16 | 北京菲波安乐仪表有限公司 | Differential pressure detection type vortex street flowmeter for measuring differential pressure on one-sided pipe wall |
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