CN111060172A - Self-generating current measuring system and method with irregular section - Google Patents
Self-generating current measuring system and method with irregular section Download PDFInfo
- Publication number
- CN111060172A CN111060172A CN201911408060.6A CN201911408060A CN111060172A CN 111060172 A CN111060172 A CN 111060172A CN 201911408060 A CN201911408060 A CN 201911408060A CN 111060172 A CN111060172 A CN 111060172A
- Authority
- CN
- China
- Prior art keywords
- flow
- section
- ultrasonic
- flow channel
- self
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- G01F1/66—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 measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
-
- 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
- G01F1/56—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 electric or magnetic effects
- G01F1/58—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 electric or magnetic effects by electromagnetic flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
Abstract
The invention discloses a self-generating current measuring system and method with irregular sections, wherein the method adopts a time difference method multi-sound-path ultrasonic current meter, each sound path passes through one point on the axis of a flow channel by utilizing the cross arrangement mode of the multi-sound-path passing through the axis, the numerical simulation is carried out on the simplified flow channel to obtain the flow velocity distribution in the flow channel, and the position of the ultrasonic current meter is determined according to the flow velocity distribution; arranging ultrasonic flow meters on a first section and a second section of the flow channel, and measuring by adopting a time difference method under the flow to be measured; and after the numerical value of the ultrasonic flow meter is stable, recording the flow velocity of each sound path, and calculating the size of the flow section. The invention is mainly applied to the flow measurement of the axial through-flow water pump and aims to solve the problem that the flow of a flow passage cannot be accurately measured due to large diameter of the flow passage, short length of a pipeline and complex flow state of the current flow measuring device.
Description
Technical Field
The invention belongs to the field of hydraulic machinery, and particularly relates to an irregular self-generating flow measuring system and method.
Background
The water-regulating irrigation and drainage unit in plain areas plays a key role in drought resistance, waterlogging drainage, urban water supply, sewage discharge, remote water supply and the like of large-scale farmlands and areas, and makes great contribution to guaranteeing the safety of lives and properties of people, the smooth progress of national economic and social construction and the benign development of ecology. The pump station flow of the water-transfer irrigation and drainage unit in plain areas is large, the single machine design flow is more than 25m3/s, the lift is low, and the design lift is about 1.0-10.0 m. Therefore, the water-regulating irrigation and drainage unit in plain areas mainly adopts axial-flow type and cross-flow type water pump units, and the cross-flow type water pump unit becomes a better choice and plays an important role in water-regulating irrigation and drainage in plain areas.
When the water pump unit operates in a steady state, the axial flow type unit operates more stably under a design working condition, but easily enters a hydraulic unstable working condition when the axial flow type unit operates under a small flow working condition. Domestic flow measuring methods include a flow meter method, a five-hole probe method, a salt concentration method, a pressure difference method and the like. The flow meter measures the inlet flow of the pump station open channel or the water inlet channel, the workload is large, the requirement on the flow measurement section is strict, the steel frame area of the flow meter is large, the interference on a flow field is obvious, the resistance of the flow channel is increased, the performance of a water pump device is influenced, the flow meter has many mechanical parts, the reliability is lower, and the measurement precision is low; for a low-lift high-flow pump station, the flow measurement by a differential pressure method is difficult to find a proper calibration position for flow measurement, and the measurement error is large; the salt concentration method has no requirement on the flow channel condition, but has lower measurement precision; the five-hole probe method determines the flow velocity of a measured point by utilizing the relation between the pressure difference of a probe pinhole and the flow velocity of the measured point, the flow measuring time of the method is long, each measuring point is replaced with a stable time, a large amount of manpower and material resources are consumed, and in addition, when a machine set runs and deviates from a better working condition, the measurement error is large. The measurement error of the method is about +/-3% -4%, and the repeatability is poor. An Accusonic product of the American ADS subsidiary company is called a leader of a world time difference method ultrasonic current measuring meter, but for a complex irregular section, the product cannot solve the problems of channel number, integral constant and the like, so that the problem of complex irregular section current measuring of a low-lift pump station cannot be solved.
Ultrasonic flow meter and ultrasonic flow meter
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide an irregular self-generating flow measuring system and method, and aims to solve the problem that the flow of a flow channel cannot be accurately measured due to large diameter of the flow channel, short length of a pipeline and complex flow state of the current flow measuring device.
In order to achieve the above object, according to an aspect of the present invention, there is provided a self-generating current measuring system with an irregular cross section, including an electromagnetic flowmeter, a valve, a circulating water supply pump, a circulating pipeline, a first current stabilizing tank, a pressure tank, a flow channel, a second current stabilizing tank, a tail water tank, and an ultrasonic current measuring meter, where the valve, the circulating water supply pump, and the circulating pipeline are sequentially disposed on one side of the electromagnetic flowmeter, and the circulating water supply pump provides water circulation power for the self-generating current measuring system; the first flow stabilizing groove, the pressure box, the flow channel, the second flow stabilizing groove and the tail water box are sequentially arranged on the other side of the electromagnetic flowmeter and are connected with the circulating pipeline, and the first flow stabilizing groove and the second flow stabilizing groove enable the flow of water flow between the pressure box and the tail water box to be stable and serve as a measuring section;
the ultrasonic flow meter enables each sound path to pass through one point on the axis of the flow channel in a cross arrangement mode that multiple sound paths pass through the axis, and the time difference method is adopted for measurement.
Preferably, the flow passage is a circular truncated cone flow passage.
Preferably, the ultrasonic flow meter has 16 sound paths 1A-8A and 1B-8B which are uniformly distributed on the first section and the second section of the flow channel to form four pairs of sound paths 1A1B-8A8B, 2A2B-7A7B, 3A3B-6A6B and 4A4B-5A 5B.
Preferably, each sound path passes through the same point of the flow channel axis, the respective axial cross-sections are congruent trapezoids, the angle between each sound path and the axis is 49 °, and the respective axial cross-sections are at 36 ° and 72 ° to the vertical, respectively.
Preferably, the ultrasonic flow meters 1A to 4A and 5A to 8A are symmetrically distributed on the first section along the vertical direction at intervals of 36 ° respectively, the ultrasonic flow meters 1B to 4B and 5B to 8B are symmetrically distributed on the second section along the vertical direction at intervals of 36 ° respectively, and the two ultrasonic flow meters of each acoustic path are on the same straight line.
Preferably, the system further comprises a hydroelectric generator, a charger and a battery, wherein the generator is arranged in the flow channel, the charger converts alternating current generated by the generator into direct current to charge the battery, and the battery provides stable electric energy for the ultrasonic current meter.
According to another aspect of the invention, a self-generating current measuring method of irregular cross section based on the device is provided, which comprises the following steps:
carrying out numerical simulation on the simplified flow channel to obtain flow velocity distribution in the flow channel, and determining the installation position of the ultrasonic flow meter according to the flow velocity distribution;
arranging ultrasonic flow meters on a first section and a second section of the flow channel, and measuring by adopting a time difference method under the flow to be measured;
after the numerical value of the ultrasonic flow meter is stable, recording the flow velocity of each sound path, and calculating the size of a flow section, wherein the size of the flow section is the ratio of the reading numerical value of the electromagnetic flow meter to the reading numerical value of the ultrasonic flow meter;
the flow rate is adjusted, repeated experiments are carried out, and the average value of the flow section size is obtained.
Preferably, the four pairs of time-difference ultrasonic flow meters have 16 sound paths 1A-8A and 1B-8B which are uniformly distributed on the first section and the second section of the flow channel to form four pairs of sound paths 1A1B-8A8B, 2A2B-7A7B, 3A3B-6A6B and 4A4B-5A5B, each sound path passes through the same point of the flow channel axis, all the shaft sections are all congruent trapezoids, the included angle between each sound path and the axis is 49 degrees, and all the shaft sections form 36 degrees and 72 degrees with the vertical direction respectively. The ultrasonic flow meters 1A to 4A and 5A to 8A are symmetrically distributed on the first section along the vertical direction at intervals of 36 degrees respectively, the ultrasonic flow meters 1B to 4B and 5B to 8B are symmetrically distributed on the second section along the vertical direction at intervals of 36 degrees respectively, and the two ultrasonic flow meters of each sound path are positioned on the same straight line.
The simplified flow channel is similar to the original flow channel on the premise of ensuring the similar mechanics and the same flow state as the original flow channel in the measurement area. And carrying out numerical simulation on the simplified flow channel by using numerical simulation software, so as to obtain an area with stronger consistency of the original flow channel flow velocity distribution. Arranging the ultrasonic flow meter in the area, and automatically acquiring the flow velocity of the flow channel at intervals of 1S by the ultrasonic flow meter; six experiments are respectively carried out on six flows with different sizes, and the ratio of the flow to the flow velocity is the area of the flow section; and calculating the numerical value of the flow section of each experiment and calculating an average value, namely the flow section area under the ultrasonic current meter arrangement mode.
Compared with the prior art, the technical scheme provided by the invention combines numerical simulation and model test, and comprehensively analyzes the measurement data of each group of ultrasonic flow meters under different flow rates by performing axis crossing arrangement on four pairs of ultrasonic flow meters, thereby obtaining the area of the flow measuring section. The problem of prior art can't realize flow measurement or the deviation is great under the major diameter, short runner, the complicated flow state is solved.
Drawings
FIG. 1 is a schematic structural diagram of a self-generating current measuring system with an irregular cross section, provided by the invention;
FIG. 2 is a schematic structural diagram of a flow channel of a self-generating current-measuring system with an irregular cross section, provided by the invention;
FIG. 3 is a three-dimensional model of a flow channel according to an embodiment of the present invention;
fig. 4 is a schematic distribution diagram of an ultrasonic flow meter in a self-generating flow measuring system with an irregular cross section, provided by an embodiment of the present invention;
FIG. 5 is a schematic view of a cross section of a flow channel provided by an embodiment of the present invention;
FIG. 6 is a schematic axial cross-section of a flow channel provided by an embodiment of the present invention;
FIG. 7 is a schematic view of a small horizontal hydroelectric generator impeller installed in a self-generating current-measuring system provided by the present invention;
reference numerals:
the device comprises an electromagnetic flowmeter (1), a valve (2), a circulating water supply pump (3), a circulating pipeline (4), a first flow stabilizing groove (5), a pressure tank (6), a flow channel (7), a second flow stabilizing groove (8), a tail water tank (9), a hydroelectric generator (10), a charger (11), a battery (12) and ultrasonic flow measuring meters (1A-8A and 1B-8B).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
It should be noted that, in the description of the present invention, the term "axial center" refers to a point on the axis of the flow channel.
As shown in fig. 1, the invention provides a self-generating current measuring system with an irregular cross section, which comprises an electromagnetic flowmeter 1, a valve, a 2-cycle water supply pump 3, a circulation pipeline 4, a first flow stabilizing groove 5, a pressure tank 6, a flow channel 7, a second flow stabilizing groove 8, a tail water tank 9 and an ultrasonic current measuring meter, wherein the valve 2, the cycle water supply pump 3 and the circulation pipeline 4 are sequentially arranged on one side of the electromagnetic flowmeter 1, and the cycle water supply pump 3 provides water circulation power for the self-generating current measuring system; the first flow stabilizing groove 5, the pressure box 6, the flow channel 7, the second flow stabilizing groove 8 and the tail water tank 9 are sequentially arranged on the other side of the electromagnetic flowmeter 1 and are connected with the circulating pipeline 4, and the first flow stabilizing groove 5 and the second flow stabilizing groove 8 enable the flow of water flow between the pressure box 6 and the tail water tank 8 to tend to be stable and serve as measuring sections;
the ultrasonic flow meter is arranged on the flow channel 7 in a cross arrangement mode that multiple sound paths pass through the axis, and each sound path is measured by adopting a time difference method through one point on the axis of the flow channel 7.
As shown in fig. 2, the system further includes a hydroelectric generator 10, a charger 11 and a battery 12, the generator 10 is disposed in the flow channel, the charger 11 converts the alternating current generated by the generator 10 into direct current to charge the battery 12, and the battery 12 provides stable electric energy for the ultrasonic current meter.
In the present embodiment, a circular truncated cone runner is taken as an example. The ultrasonic flow meter has 16 pieces 1A-8A and 1B-8B, which are uniformly distributed on the first section and the second section of the flow passage to form four pairs of sound paths 1A1B-8A8B, 2A2B-7A7B, 3A3B-6A6B and 4A4B-5A5B, as shown in FIG. 3. Each sound path passes through the same point of the flow channel axis, all the axial sections are congruent trapezoids, the included angle between each sound path and the axis is 49 degrees, and the included angles between all the axial sections and the vertical direction are respectively 36 degrees and 72 degrees. The ultrasonic flow meters 1A to 4A and 5A to 8A are symmetrically distributed on the first section along the vertical direction at intervals of 36 degrees respectively, the ultrasonic flow meters 1B to 4B and 5B to 8B are symmetrically distributed on the second section along the vertical direction at intervals of 36 degrees respectively, and the two ultrasonic flow meters of each sound path are positioned on the same straight line. The specific structure is shown in fig. 4 and 5.
The invention also provides a self-generating current measuring method of the irregular section based on the device, which comprises the following steps:
simplifying the original flow channel on the premise of ensuring that the flow state in the measuring region is the same as that of the original flow channel, carrying out numerical simulation on the simplified flow channel, investigating the influence on the flow state of the ultrasonic flow meter mounting region after the bulb body and the rotating wheel are cancelled through the numerical simulation to obtain the flow velocity distribution in the flow channel, and obtaining the position of a flow velocity stable region according to the flow velocity distribution so as to determine the position of the ultrasonic flow meter;
arranging ultrasonic flow meters on the first cross section and the second cross section of the flow channel, turning on a water supply pump, and discharging bubbles; a hydroelectric generator in the flow channel charges a power supply battery of the ultrasonic current meter; the ultrasonic flow meter records the flow value once every 30S, and the average value is taken as the accurate value of the flow;
after the numerical value of the ultrasonic flow meter is stable, recording the flow velocity of each sound path, automatically acquiring the flow velocity of a flow channel at intervals of 1S by the ultrasonic flow meter, taking an average value as an accurate value of the flow velocity, respectively taking six flows with different sizes to perform six experiments, and taking the ratio of the flow velocity to the flow velocity as the area of a flow section; and calculating the numerical value of the flow section of each experiment and calculating an average value, namely the flow section area under the ultrasonic current meter arrangement mode.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The self-generating current measuring system with the irregular cross section is characterized by comprising an electromagnetic flowmeter (1), a valve (2), a circulating water supply pump (3), a circulating pipeline (4), a first flow stabilizing groove (5), a pressure tank (6), a flow channel (7), a second flow stabilizing groove (8), a tail water tank (9) and an ultrasonic current measuring meter, wherein the valve (2), the circulating water supply pump (3) and the circulating pipeline (4) are sequentially arranged on one side of the electromagnetic flowmeter (1), and the circulating water supply pump (3) provides water circulation power for the self-generating current measuring system; the first flow stabilizing groove (5), the pressure box (6), the flow channel (7), the second flow stabilizing groove (8) and the tail water box (9) are sequentially arranged on the other side of the electromagnetic flowmeter (1) and are connected with the circulating pipeline (4), and the first flow stabilizing groove (5) and the second flow stabilizing groove (8) enable the flow of water in the flow channel (7) between the pressure box (6) and the tail water box (9) to tend to be stable;
the ultrasonic flow meter is installed on the flow channel (7) in a cross arrangement mode that multiple sound paths pass through the axis, and each sound path is measured through one point on the axis of the flow channel (7) by adopting a time difference method.
2. The self-generating current-measuring system according to claim 1, wherein the flow channel (7) is a circular truncated cone flow channel.
3. The self-generating current measuring system according to claim 2, wherein the ultrasonic current measuring meter has 16 sound paths 1A 1-8A and 1B-8B, and the sound paths are uniformly distributed on the first cross section and the second cross section of the flow channel (7) to form four pairs of sound paths 1A1B-8A8B, 2A2B-7A7B, 3A3B-6A6B and 4A4B-5A 5B.
4. The self-generating current-measuring system according to claim 3, wherein each sound path passes through the same point of the axis of the flow channel (7), the cross sections of the shafts are all congruent trapezoids, the included angle between each sound path and the axis is 49 degrees, and the cross sections of the shafts form 36 degrees and 72 degrees with the vertical direction respectively.
5. The self-power-generation flow measuring system according to claim 3, wherein the ultrasonic flow meters 1A to 4A and 5A to 8A are symmetrically distributed on a first section in the vertical direction at intervals of 36 degrees, respectively, and the ultrasonic flow meters 1B to 4B and 5B to 8B are symmetrically distributed on a second section in the vertical direction at intervals of 36 degrees, respectively, and the two ultrasonic flow meters of each acoustic path are on the same straight line.
6. The self-generating current-measuring system according to claim 1, further comprising a hydroelectric generator (10), a charger (11) and a battery (12), wherein the generator (10) is arranged in the flow channel (7), the charger (11) converts alternating current generated by the generator (10) into direct current to charge the battery (12), and the battery (12) provides stable electric energy for the ultrasonic current meter.
7. A self-generating current measuring method of irregular cross section based on the device of any one of claims 1 to 6, characterized by comprising the following steps:
carrying out numerical simulation on the simplified flow channel to obtain flow velocity distribution in the flow channel, and determining the installation position of the ultrasonic flow meter according to the flow velocity distribution;
arranging ultrasonic flow meters on a first section and a second section of the flow channel, and measuring by adopting a time difference method under the flow to be measured;
and after the numerical value of the ultrasonic flow meter is stable, recording the flow velocity of each sound path, and calculating the size of the flow section.
8. The self-power-generation current measuring method according to claim 7, wherein the four pairs of time-difference ultrasonic current meters have 16 ultrasonic current meters 1A-8A and 1B-8B, are uniformly distributed on the first section and the second section of the flow channel (7), form four pairs of sound paths 1A1B-8A8B, 2A2B-7A7B, 3A3B-6A6B and 4A4B-5A5B, each sound path passes through the same point of the axis of the flow channel (7), each axial section is in an identical trapezoid shape, the included angle between each sound path and the axis is 49 degrees, and each axial section forms 36 degrees and 72 degrees with the vertical direction respectively.
9. The self-power-generation current measuring method according to claim 7, wherein the ultrasonic current meters 1A to 4A and 5A to 8A are symmetrically distributed on a first section at intervals of 36 degrees in the vertical direction, and the ultrasonic current meters 1B to 4B and 5B to 8B are symmetrically distributed on a second section at intervals of 36 degrees in the vertical direction, and the two ultrasonic current meters of each sound path are located on the same straight line.
10. The self-generating current measuring method according to claim 7, wherein the size of the flow section is a ratio of flow rate to flow velocity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911408060.6A CN111060172A (en) | 2019-12-31 | 2019-12-31 | Self-generating current measuring system and method with irregular section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911408060.6A CN111060172A (en) | 2019-12-31 | 2019-12-31 | Self-generating current measuring system and method with irregular section |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111060172A true CN111060172A (en) | 2020-04-24 |
Family
ID=70305382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911408060.6A Pending CN111060172A (en) | 2019-12-31 | 2019-12-31 | Self-generating current measuring system and method with irregular section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111060172A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092814A (en) * | 2021-03-16 | 2021-07-09 | 山东科技大学 | High-precision air flow measuring method for mine roadway |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729601A (en) * | 2013-12-19 | 2015-06-24 | 陕西迅腾通信科技有限公司 | Faucet water meter |
| CN104729597A (en) * | 2013-12-19 | 2015-06-24 | 西安北斗星数码信息股份有限公司 | Vertical self-generating ultrasonic intelligent water meter |
| DE102015101537A1 (en) * | 2015-02-03 | 2016-08-04 | Rheinisch-Westfälische Technische Hochschule (Rwth) Aachen | Method and arrangement for analyzing a material flow |
-
2019
- 2019-12-31 CN CN201911408060.6A patent/CN111060172A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729601A (en) * | 2013-12-19 | 2015-06-24 | 陕西迅腾通信科技有限公司 | Faucet water meter |
| CN104729597A (en) * | 2013-12-19 | 2015-06-24 | 西安北斗星数码信息股份有限公司 | Vertical self-generating ultrasonic intelligent water meter |
| DE102015101537A1 (en) * | 2015-02-03 | 2016-08-04 | Rheinisch-Westfälische Technische Hochschule (Rwth) Aachen | Method and arrangement for analyzing a material flow |
Non-Patent Citations (1)
| Title |
|---|
| 黄昱 郑源 等: "超声波流量计在复杂流道中应用的试验研究", 《流体机械》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113092814A (en) * | 2021-03-16 | 2021-07-09 | 山东科技大学 | High-precision air flow measuring method for mine roadway |
| CN113092814B (en) * | 2021-03-16 | 2022-01-25 | 山东科技大学 | High-precision air flow measuring method for mine roadway |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104696233B (en) | A kind of calibration steps of centrifugal pump Inner Flow Simulation result | |
| CN109060056B (en) | A kind of river cross-section method of calculating flux of contactless radar flow measurement | |
| CN107355688A (en) | A kind of LeakView urban water supplies pipe network model Control management system | |
| CN108254032A (en) | River ultrasonic wave time difference method method of calculating flux | |
| CN104696234B (en) | Large-scale low-lift pump device energy characteristics projectional technique | |
| CN104454564A (en) | Axial flow pump device guide vane body hydraulic optimization method based on tests | |
| CN109635501A (en) | A kind of reduction water supply network leakage loss method based on hydraulic model | |
| CN108717593A (en) | A kind of microcosmic structure generated energy appraisal procedure based on wind wheel face equivalent wind speed | |
| CN111060172A (en) | Self-generating current measuring system and method with irregular section | |
| CN105260580A (en) | Method for determining pressure pulsation amplitude of draft tube of mixed-flow water turbine | |
| CN114001710B (en) | High-precision channel flow cross-section area measuring device and measuring method | |
| CN208061413U (en) | A kind of ultrasonic liquid flow meter Automatic parameter configuration system | |
| CN201392216Y (en) | Energy-saving differential pressure flowmeter | |
| CN108444555A (en) | A kind of novel Venturi tube-type spreader flowmeter | |
| Segalini et al. | Global blockage effects in wind farms | |
| CN204025064U (en) | With the high-efficiency vertical axial-flow pump device of pilot blade flow measurement | |
| CN108280300A (en) | High amount of traffic gauge development approach based on Fluid Mechanics Computation | |
| CN1186596C (en) | Method for measuring continuous current flux of separate injection well | |
| CN204740113U (en) | Simple and easy testing arrangement of pipeline vibration based on wireless vibration sensor | |
| CN102914339A (en) | Method for measuring water leakage of guide blades of water turbine based on steel pipeline upper flat section volume method | |
| CN110926995A (en) | Physical model test method for local scour of parallel bridge pier | |
| CN102384770A (en) | Flow sensor for water source well | |
| Cao et al. | Field test for hydraulic turbine discharge and efficiency based on current-meter method | |
| CN110629728A (en) | Pipeline impact jet flow uniform aeration generating device | |
| CN214251353U (en) | Water turbine water head real-time measuring device for water diversion type hydropower station |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200424 |
|
| RJ01 | Rejection of invention patent application after publication |