CN205449231U - Sheet flow roll wave measuring device based on electromagnetic sensor - Google Patents
Sheet flow roll wave measuring device based on electromagnetic sensor Download PDFInfo
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- CN205449231U CN205449231U CN201521118515.8U CN201521118515U CN205449231U CN 205449231 U CN205449231 U CN 205449231U CN 201521118515 U CN201521118515 U CN 201521118515U CN 205449231 U CN205449231 U CN 205449231U
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Abstract
本实用新型涉及一种基于电磁传感器的薄层水流滚波测量装置，包括：设置在平坦的坡面上的多个电磁滚波传感器，多个电磁滚波传感器分为多个组，每组两个电磁滚波传感器，各组电磁滚波传感器沿水流方向一字型排列，各组电磁滚波传感器之间的距离小于被测滚波的间距，大于被测滚波的宽度；各个电磁滚波传感器依次与数据采集控制器、控制电脑连接。本实用新型采用在产生薄层水流滚波的位置，如水渠、水坝溢洪道或实验室中的水槽上安装电磁滚波传感器，利用灵敏的电磁滚波传感器检测水流的厚度变化，实现对滚波的观测，以及精确的数据采集，完全排除了人为检测的因素，全自动的完成了各种数据的采集，既精确又快捷，节约了人力、物力，提高了观测效率。
The utility model relates to a thin-layer water flow rolling wave measuring device based on an electromagnetic sensor, which comprises: a plurality of electromagnetic rolling wave sensors arranged on a flat slope surface, and a plurality of electromagnetic rolling wave sensors are divided into multiple groups, and each group has two Each group of electromagnetic rolling wave sensors is arranged in a line along the water flow direction, and the distance between each group of electromagnetic rolling wave sensors is smaller than the distance between the measured rolling waves and greater than the width of the measured rolling waves; each electromagnetic rolling wave The sensor is sequentially connected with the data acquisition controller and the control computer. The utility model installs an electromagnetic rolling wave sensor on the position where the thin-layer water flow roll is generated, such as a water channel, a dam spillway or a water tank in a laboratory, and uses a sensitive electromagnetic rolling wave sensor to detect the thickness change of the water flow, so as to realize the anti-rolling wave sensor. Observation and accurate data collection completely eliminate the factors of human detection, and complete the collection of various data fully automatically, which is accurate and fast, saves manpower and material resources, and improves observation efficiency.
Description
Technical field
This utility model relates to a kind of sheet flow roll wave measurement apparatus based on electromagnetic transducer, it it is a kind of experimental provision, it it is a kind of device for hydraulic measurements, it is a kind of for measuring the depth of water in sheet flow flow process, the wave height of roll wave, cycle, frequency and velocity of wave, and roll wave momentum, the isoparametric self-operated measuring unit of kinetic energy.
Background technology
Slope flow, open-channel flow etc. under certain critical condition, its surface usually can unstability and grow a series of wave process.These fluctuations are probably periodically, and velocity of wave and waveform all keep constant, and velocity of wave is consistently greater than the movement velocity of current particle；On the other hand, fluctuation is also likely to be acyclic, and waveform and velocity of wave constantly develop during propagating, and final generation crushes.These phenomenons are referred to as roll wave.Roll wave is common in natural slope, urban pavement, the sluicing chute in power station and the spillway of dam, the flood passage road in river, flume etc..The appearance of roll wave can bring a series of disadvantageous consequence, and such as current become unsteady flow from steady flow；Strengthen current makes soil particle peeling-off and the ability of defeated shifting silt to the erosiveness of Soil Slope；The depth of water at crest exceedes the design head in river (canal) road, causes overflow；Strong current aeration effect, causes atomizating phenomenon；Simultaneously to hydraulic structure pressure or stress of causing over loading on river (canal) road etc..Therefore, the critical condition of research roll wave formation and Evolution thereof, configuring for soil erosion process and water-and-soil conservation measures, and how to eliminate the theoretical research of roll wave and related discipline in engineering practice, such as movable bed resistance and current sediment transport etc. suffer from significance.
Existing observation is then to utilize hydrology chaining pin directly to observe, the method is mainly by the relative position manually determining chaining pin and roll wave, owing to being that artificial visual is measured, and the change of roll wave is exceedingly fast, and human eye range estimation tends not to reach due effect, measurement is difficult to ensure that precision, due to artificial measurement, its less stable, each measurement result all differs, pendulous frequency can only be increased, use the acquisition of the method approximation of statistics to measure.This mode makes roll wave measurement become a kind of needs multiple complicated physical work, and along with the physically-draining of people, its precision also becomes worse and worse.Accordingly, it would be desirable to a kind of accurate system replaces this heavy muscle power measurement.
Summary of the invention
In order to overcome problem of the prior art, the utility model proposes a kind of sheet flow roll wave measurement apparatus based on electromagnetic transducer.Described device utilizes electromagnetism roll wave sensor, by the system integration and automatic mode, it is achieved sheet flow water level, and the real time dynamic measurement to roll wave, thus is effectively improved the precision and stability of measurement, improves observed efficiency.
The purpose of this utility model is achieved in that a kind of sheet flow roll wave measurement apparatus based on electromagnetic transducer, including: be arranged on smooth domatic on multiple electromagnetism roll wave sensors, described electromagnetism roll wave sensor is arranged such that: multiple electromagnetism roll wave sensors are divided into multiple groups, often two electromagnetism roll wave sensors of group, each group electromagnetism roll wave sensor arranges along water (flow) direction yi word pattern, distance between each group electromagnetism roll wave sensor is less than the spacing of tested roll wave, more than the width of tested roll wave；Two electromagnetism roll wave sensors in each group are along water (flow) direction word order, distance between two electromagnetism roll wave sensors is more than the distance between crest and the trough of tested roll wave, and each described electromagnetism roll wave sensor is connected with data acquisition controller, control computer successively.
Further, described electromagnetism roll wave sensor includes: U-shaped cross over pipe, one end of described U-shaped cross over pipe is arranged on domatic bottom, the other end of described U-shaped cross over pipe opens wide to air, U-shaped cross over pipe opens wide side to air and arranges guide rod, described guide rod is provided with electromagnetism sensing unit, described guide rod is cased with annular float.
Further, described electromagnetism sensing unit is the float of ferromagnetic material and Hall element or induction coil.
Further, described domatic be the bottom land of experimental trough, described experimental tank includes: both sides ledge and the bottom land being connected with described ledge, described ledge and bottom land are arranged on steel frame, and described tank one end arranges water inlet, and the other end arranges outlet, described outlet is connected with circulating water pool pipeline, described water inlet is connected with described circulating water pool pipeline by water pump, and described steel frame outlet side arranges hinge, and opposite side arranges elevating mechanism.
This utility model produces and provides the benefit that: this utility model uses in the position producing sheet flow roll wave, as installed electromagnetism roll wave sensor on the tank in water channel, dam spillway or laboratory, utilize the thickness change of sensitive electromagnetism roll wave sensor detection current, realize the observation to roll wave, and accurate data acquisition, entirely eliminated the factor of artificial detection, the full automatic collection completing various data, the most accurate but also quick, save human and material resources, improve observed efficiency.
Accompanying drawing explanation
The utility model is described in further detail with embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the principle schematic of device described in embodiment one of the present utility model；
Fig. 2 is the distance schematic diagram between the width of roll wave and two roll waves, is the enlarged drawing of the tank longitudinal direction that in Fig. 1, E point is cut open by the sectional elevation along water (flow) direction；
Fig. 3 is electromagnetism roll wave sensor and the structural representation of tank described in embodiment two, four of the present utility model, is the profile of A-A in Fig. 4；
Fig. 4 is the structural representation of tank described in embodiment four of the present utility model.
Detailed description of the invention
Embodiment one:
The present embodiment is a kind of sheet flow roll wave measurement apparatus based on electromagnetic transducer, as shown in Figure 1.The present embodiment includes: the multiple electromagnetism roll wave sensors 2 being arranged on smooth domatic 1, described electromagnetism roll wave sensor is arranged such that: multiple electromagnetism roll wave sensors are divided into multiple groups, often two electromagnetism roll wave sensors of group, each group electromagnetism roll wave sensor arranges along water (flow) direction yi word pattern, distance between each group electromagnetism roll wave sensor is less than the spacing of tested roll wave, more than the width of tested roll wave；Two electromagnetism roll wave sensors in each group are along water (flow) direction word order, distance between two electromagnetism roll wave sensors is more than the distance between crest and the trough of tested roll wave, and each described electromagnetism roll wave sensor is connected with data acquisition controller 3, control computer 4 successively.
Sheet flow described in the present embodiment refers to the thickness of current current below 30 centimetres, the saying of this " sheet flow " is a kind of custom appellation in the industry, and not with respect to " thick-layer current ", because, not " thick-layer current " such appellation in the field of business.
Flat grade described in the present embodiment can be simulation channel bottom surface with certain slope in the lab, it is also possible to be the actual canal bottom surface with certain slope, or the bottom surface of the dam flood-relief channel tilted, or chooses the domatic of flat piece in the wild.
Domatic smooth be relative, requiring two main points, one is not have obvious size outthrust on domatic, one be domatic should be substantially plane, the most significantly arch upward and cave in, i.e. the line of slope along water (flow) direction and the section of Transverse to the flow direction should be all straight line or close to straight line.Domatic can be the most smooth plane, such as the channel bottom surface utilizing the sheet material such as glass, plastics to simulate in the lab, or actual canal or the bottom surface of dam flood-relief channel.The bottom surface of actual canal or dam flood-relief channel is artificial construction, is substantially smooth, the most obvious size thrust.It is a piece of domatic that field is chosen, and requires do not have obvious size outthrust, and avoids domatic overall curved surface arch upward and cave in.If certainly specializing in the domatic roll wave arching upward with entirety or caving in, work as another matter.
Electromagnetism roll wave sensor described in the present embodiment can use guide rod type magnetic float level indicator, or custom-designed electromagnetism roll wave sensor.The ultimate principle of electromagnetism roll wave sensor is to be placed on the water surface by the float that magnetic material is constituted, when float fluctuates with water level, the changes such as magnetic field is subjected to displacement, with electromagnetic induction element, such as Hall element or electromagnetic induction coil, the change in displacement in detection magnetic field, is converted to the signal of telecommunication by the change in magnetic field, is finally SEA LEVEL VARIATION data by harvester collection.
The structure of guide rod type magnetic float level indicator for making annular sleeve on a guide rod by float, and float moves up and down along guide rod with liquid level change.One permanent magnetism object is set in float, magneto sensor is set inside guide rod simultaneously, by magneto sensor detection float position the signal of telecommunication output that transfers representative height of liquid level corresponding thereto to.This kind of liquidometer shows preferably when container inner medium exists strenuous exercise, has the feature of simple in construction only needing remote transfer signal to need not on-the-spot Liquid level scale formula instruction when.
For obtaining the change of water level, it is generally the case that need to use pipeline to be guided outside runner by water level, re-use electromagnetic induction element and obtain the signal of SEA LEVEL VARIATION.General means is in tank base plate perforate, and is attached with tank with conduit electromagnetism roll wave sensor, forms the device of a communicating pipe.Laying array at Parallel to the flow direction, as being 5-10 group electromagnetism roll wave sensor or more, often group sets two electromagnetism roll wave sensors.Such as arranging 20 electromagnetism roll wave sensors in 15 meters of long tanks, and be attached with acquisition controller by connecting line, one group of sensor is laid at interval of 1m, and the spacing between group inner sensor is set to 5cm.
Electromagnetism roll wave sensor is installed must be vertical, to ensure that floating ball component moves up and down freely in main body tube.And it is impermissible for magnetic conductor around electromagnetism roll wave sensor main body near the correct work otherwise directly affecting electromagnetism roll wave sensor.After electromagnetism roll wave sensor installs, need to be corrected turned column is guided once making zero-bit redness shown below with magnet steel, more than zero-bit show white.
This is a kind of exactly accurate measurement means, can measure the sheet flow of thickness of several millimetres, and the SEA LEVEL VARIATION of a few tenths of a mm.Owing to needing the installation of pipeline, therefore, it is relatively more suitable for carrying out in the lab the measurement of high precision.
Measure due to the present embodiment is the roll wave of sheet flow, and its SEA LEVEL VARIATION is relative trace, tests in the tank set up the most in the lab, can obtain point-device measurement result.Using electromagnetism roll wave sensor measurement water level can have various ways, one of which is to use U-tube electromagnetism roll wave sensor.
The arrangement mode of electromagnetism roll wave sensor is the most exquisite, it is necessary to adapt with the needs of experiment and the environment of Site Detection roll wave.The mode of this arrangement that the present embodiment proposes, its thinking is: be likely to occur multiple roll wave on domatic, utilizes plurality of electromagnetic roll wave sensor to measure these roll waves on domatic respectively.Two the electromagnetism roll wave sensors often organized are then for judging single roll wave and detecting.Often the distance between each sensor in group more than the width d of single roll wave, but should be less than distance L between two roll waves.The width of the roll wave described in the present embodiment refers to: in water (flow) direction, the single roll wave depth of water is more than the length of mean depth part, as in figure 2 it is shown, the dotted line in figure represents mean depth.
Longer domatic on 8-10 group electromagnetism roll wave sensor can be set, shorter domatic on then few several groups of electromagnetism roll wave sensors can also, Fig. 1 only depicts 5 groups of electromagnetism roll wave sensors, actual can also increase more groups.
The present embodiment is gathered the change of the current signal of electromagnetism roll wave sensor thus releases the change of the current depth of water by data acquisition unit controller, thus studies the Hydrodynamic Parameters of sheet flow and the characteristic parameter of roll wave.The collected data of single electromagnetism roll wave sensor can draw mean depth and the cycle of roll wave, frequency and the wave height of current.And each group of liquidometer calculates the velocity of wave of roll wave by the spacing between time difference and the electromagnetism roll wave sensor of the wave height gathered.
Data acquisition controller is the instrument controlling frequency acquisition, and the current signal of collection is converted into digital signal, and the real-time data to sensor are acquired.Due to needs many groups common-battery magnetic roll wave sensor, therefore acquisition controller at least needs to be equipped with the acquisition channel identical with electromagnetism roll wave number of sensors, and the collection between each passage does not interfere with each other.
The program and Treatment Analysis controlling there is the program controlling harvester parameter in computer with imports collection data gathers the software of data.Its Main Function is to control the frequency acquisition of harvester and obtain mean depth by being analyzed process in importing computer real-time for the data in capture card, the wave height of roll wave, cycle, frequency and velocity of wave and the kinetic energy of roll wave.
Embodiment two:
The present embodiment is the improvement of embodiment one, is the embodiment refinement about electromagnetism roll wave sensor.Electromagnetism roll wave sensor described in the present embodiment includes: U-shaped cross over pipe 204, one end of described U-shaped cross over pipe is arranged on domatic bottom, the other end of described U-shaped cross over pipe opens wide to air, U-shaped cross over pipe opens wide side to air and arranges guide rod 201, described guide rod is provided with electromagnetism sensing unit 202, annular float 203 it is cased with, as shown in Figure 3 on described guide rod.
Arrange the water inlet of U-tube in domatic bottom, the other end of U-tube opens wide to air, and is full of water in U-tube.When not having current to flow through domatic, the water in U-tube is maintained at the height equal with face toe, when current occur, the water level of U-tube rises to the height of current, when roll wave is through out-of-date, water level in U-tube increases with water roll wave, annular float in U-tube then upwards floats with the water surface, makes magnetic field change, the final signal of telecommunication producing roll wave.
Embodiment three:
The present embodiment is the improvement of embodiment two, is the embodiment two refinement about electromagnetism sensing unit.Electromagnetism sensing unit described in the present embodiment is the float of ferromagnetic material and Hall element or induction coil.
Float can mix magnetic powder by nonmetallic materials, is processed as annulus, hollow ball or hollow cylinder.
If float is annular, being enclosed within guide rod, induction coil or Hall element are placed in guide rod, can produce sensitive electromagnetic induction effect.
Embodiment four:
The present embodiment is the improvement of above-described embodiment, is that above-described embodiment is about domatic refinement.Domatic described in the present embodiment is the bottom land of experimental trough, described experimental tank includes: both sides ledge 101 and the bottom land 103 being connected with described ledge, described ledge and bottom land are arranged on steel frame 102, described tank one end arranges water inlet 106, the other end arranges outlet 109, described outlet is connected with circulating water pool 108 pipeline, described water inlet is connected with described circulating water pool pipeline by water pump 107, described steel frame outlet side arranges hinge 104, opposite side arranges elevating mechanism 105, as shown in Figure 3,4.
The present embodiment is a kind of tank that may be mounted in laboratory, holds up tank by steelframe, and steelframe can change the angle of tank by hinge and elevating mechanism, carries out the experiment of various domatic angle.Tank can use the material such as glass or lucite.
The two ends of tank are respectively provided with water inlet and outlet, are made the water circulation in tank by water pump and circulating water pool, and water pump can use variable frequency pump, in order to carry out the current experiment of various flow.
For being accurately controlled flow, electromagnetic flowmeter can be set between flow control valve and tank.Accurate sheet flow is produced by flow control valve and electromagnetic flowmeter.
For guaranteeing stablizing of current in tank, reduce the interference that roll wave is produced, can multiple water inlet be set, arranging (yi word pattern is vertical with water (flow) direction) at sink top yi word pattern, make the current can formation sheet flow in tank uniformly.
As a rule, the current of water pump output are with certain pulsation, if exit of pump (water inlet of tank) is set directly at sink top, the current formed can be disturbed by pulsation, making water flow process uneven, in interference sheet flow, the formation of roll wave, does not reaches the effect of experiment.Therefore current fairing, stationary flow can be set in the tank water inlet, top of tank.
Current fairing is really the system of a set of elimination water supply flow instability, it is ensured that the stability of water outlet water flow process and uniformity, thus eliminates water supply and produce roll wave and the impact of evolution.
Current fairing can be water tank, i.e. arranging a water tank at the top that tank is domatic, store certain water yield, the outlet (flowing to the water out of tank) of water tank is downflow weir, the impact utilizing the volume-absorption water pump water supply of Water in Water Tanks amount to produce, utilizes overflow to produce stable sheet flow.
Water tank overflow supplies water and there is also the problem such as instability, water tank vibrations, the unstability of the water tank overflow process caused.And hence it is also possible to further downflow weir to be changed into multilamellar rectification orifice plate or rectification tube sheet, utilize the current of the further stable output of orifice plate or tube sheet.Rectification orifice plate is exactly the water hole having stamped diameter about 1mm fine and closely woven on the corrosion resistant plate of thickness about 2mm, by multiple-layer stacked, places between water inlet and the overflow limit of tank, eliminates, with this, the water flow fluctuation that cistern water supply pipe out of flow procedure causes.Rectification hole pipe is to eliminate the uneven eddy current that water tank overflow process is formed, and after being placed on overflow, the top rectification tube sheet of tank is formed by diameter 1cm, the pvc pipe close-packed arrays of long 2 ~ 3cm.
Embodiment five:
The present embodiment is a kind of method using device described in above-described embodiment to carry out sheet flow roll wave measurement.
The principle of described method:
1. water-depth measurement
The calculating of mean depth: magnetic float level indicator is formed a device connected with tank, when discharging water, the water depth ratio of current causes the change in location of liquidometer float, thus cause the change of electric current, real-time current is acquired by harvester, then pass through the electric current formula corresponding with the depth of water of demarcation thus calculate the change of the depth of water, the data of collection are averaged, thus obtain the mean depth of current.
2. roll wave wave height is measured
The judgement of roll wave and the calculating of wave height: made comparisons with average water place value by each water level value collected, continuous 3 monitoring water level values are roll wave more than average water place value, record maximum stage value during this period, maximum stage value h automaticallymaxWith average water place valueDifference be wave height.
3. roll wave velocity of wave, ripple frequency are measured and are measured along journey velocity of wave, ripple frequency
Roll wave velocity of wave calculates: often divided by each liquidometer, group liquidometer spacing occurs that the time difference of maximum stage value is roll wave velocity of wave, i.e.Wherein v is roll wave velocity of wave, and l is the spacing of one group of liquidometer, and t is the time difference that often maximum stage value occurs in the interior each liquidometer of group.
Single magnetic float level indicator occurs that the time difference of twice roll wave is exactly the cycle T of roll wave, and the inverse in cycle is exactly frequency f.I.e., wherein: f is frequency, T is the cycle.
4. roll wave momentum is measured with kinetic energy
Roll wave Kinetic Energy Calculation: with amassing as abscissa of the duration between the double record of roll wave velocity of wave and liquidometer, with record continuously and map for vertical coordinate with the difference of average water place value more than the water level value of mean water, i.e. can depict the transverse section of roll wave, utilize the area of CAD software estimation transverse section, be multiplied by, with area, the quality that the density of water is exactly single wide roll wave.Quality is multiplied by the momentum that velocity of wave is exactly rolling, and quality is multiplied by the kinetic energy that 1/2 power of velocity of wave is exactly roll wave.
Computing formula is:
Roll wave momentum: p=ρ Av, whereinFor the density of water, A is the area of roll wave transverse section, tries to achieve with CAD software,It it is the velocity of wave of roll wave.
Roll wave kinetic energy:WhereinFor the density of water, A is the area of roll wave transverse section, tries to achieve with CAD software, is the velocity of wave of roll wave.
Specifically comprising the following steps that of described method
Set the step of frequency acquisition: for being set the sample frequency of electromagnetism roll wave sensor by computer.Sample frequency is that sensor is measured signals collecting to the frequency in computer by data acquisition unit, and sample frequency can visually roll wave frequency be adjusted, and typically should be more than 10 times of range estimation roll wave frequency.
The step gathered: for coming interim with the current of roll wave, all electromagnetism roll wave sensor synchronous acquisition waterlevel datas, and the data that will gather import in computer, be analyzed data processing the roll wave cycle that directly calculates, frequency, wave height, along journey velocity of wave and mean depth.What electromagnetism roll wave sensor was gathered is the high variable quantity of the water surface, accordingly, it would be desirable to judge appearance and the various parameters of roll wave of roll wave according to the height of the water surface.Owing to using the electromagnetism roll wave sensor of two group, can be acquired in two positions that roll wave occurs simultaneously, according to the distance between the time gathered, two sensors, and the height of water level collected compares, draw the cycle, frequency, wave height, along various parameters such as journey velocity of wave and mean depths.
Calculate the step of roll wave kinetic energy: be used for utilizing the roll wave depth of water, time interval and along journey velocity of wave data estimation roll wave kinetic energy.The various roll wave parameters obtained by previous step, calculate the kinetic energy of roll wave.Roll wave kinetic energy is to weigh the current important indicator to Effects of Underlying Surfaces intensity and sediment transport capacity etc..
Embodiment six:
The present embodiment is the improvement of embodiment five, is the embodiment five refinement about the calculating of roll wave mean depth, wave height, velocity of wave, cycle and frequency.Roll wave mean depth described in the present embodiment, wave height, velocity of wave, cycle are as follows with the computational methods of frequency:
The calculating of mean depth: when domatic have current to flow through time, the height h of the electromagnetism roll wave sensor measurement water surface1, gather through n time, n the depth of water be averaged, obtain the mean depth of section.Current test in, electromagnetism roll wave sensor do not have current through when, the water quantity holding in U-tube is the position that face toe is consistent, is the position h of bottom of gullet0, h0=0.The data collected carry out the height h obtaining electromagnetic transducer with the water surface that converts1.Then the depth of water is h=h0-h1, gather through n time, n the depth of water be averaged, obtain the mean depth of section.In order to find accurate mean depth, the frequency n of detection generally to reach thousands of times, or tens thousand of times.
The judgement of roll wave and the calculating of wave height: made comparisons with average water place value by each water level value collected, continuous 3 monitoring water level values are roll wave, record maximum stage value during this period, maximum stage value h more than average water place valuemaxWith average water place valueDifference be wave height.
Roll wave velocity of wave calculates: often divided by often organizing electromagnetism roll wave sensor, spacing l between group electromagnetism roll wave sensor occurs that time difference t of maximum stage value is roll wave velocity of wave v.I.e.Wherein v is roll wave velocity of wave, and l is the spacing of one group of sensor, and t is the time difference that maximum stage value occurs in each group of sensor.
Roll wave cycle and frequency: single sensor occurs that the time difference of twice roll wave is exactly the cycle T of roll wave, and the inverse in cycle is then frequency f of roll wave.I.e., wherein: f is frequency, T is the cycle.
Embodiment seven:
The present embodiment is the improvement of embodiment six, is the embodiment six refinement about roll wave kinetic energy.The calculation procedure of the roll wave kinetic energy described in the present embodiment is as follows:
With amassing as abscissa of the duration between roll wave velocity of wave and the double record of electromagnetism roll wave sensor, with record continuously and map for vertical coordinate with the difference of average water place value more than the water level value of mean water, depict the transverse section of roll wave；
Calculate the area of the transverse section of roll wave.The mapping software of CAD etc can be used, carry out the areal calculation of the transverse section of roll wave, it is also possible to directly use Freehandhand-drawing to calculate.
It is multiplied by the density of water with the area of the transverse section of roll wave and obtains the single wide quality of roll wave.
Single wide quality is multiplied by velocity of wave and obtains the momentum of roll wave, it may be assumed that p=ρ Av, whereinFor the density of water, A is the area of roll wave transverse section,It it is the velocity of wave of roll wave.
1/2 power that single wide quality is multiplied by velocity of wave is obtained the kinetic energy of roll wave, it may be assumed that。
Finally it should be noted that, below only in order to the technical solution of the utility model to be described and unrestricted, although this utility model being described in detail with reference to preferred arrangement scheme, it will be understood by those within the art that, the technical solution of the utility model (the such as fixed form of electromagnetism roll wave sensor, roll wave acquisition mode, the sequencing etc. of step) can be modified or equivalent, without deviating from the spirit and scope of technical solutions of the utility model.
Claims (4)
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| CN201521118515.8U CN205449231U (en) | 2015-12-30 | 2015-12-30 | Sheet flow roll wave measuring device based on electromagnetic sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466527A (en) * | 2015-12-30 | 2016-04-06 | 中国水利水电科学研究院 | Thin sheet flow roll wave measurement system and method based on electromagnetic sensors |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105466527A (en) * | 2015-12-30 | 2016-04-06 | 中国水利水电科学研究院 | Thin sheet flow roll wave measurement system and method based on electromagnetic sensors |
| CN105466527B (en) * | 2015-12-30 | 2018-11-16 | 中国水利水电科学研究院 | A kind of sheet flow roll wave measuring system and method based on electromagnetic sensor |
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