CN2234094Y - Turbulence measurable device with rotary mechanism - Google Patents

Abstract

The utility model relates to a turbulence measurable device with a rotary mechanism, which is composed of the probe of the rotary mechanism, a signal transformation part and a data processing part. A section of the front part of the probe is circumferentially and separately distributed with three pressure measuring holes with 45 DEG. The handle of the rotary mechanism, a dial and a circular rod are fixedly connected as integration, and a pointer and a sleeve are integrally fixed on a support bracket and is sheathed out of the circular rod; the signal transformation part is composed of a semiconductor pressure transducer and an A/D plate; the data processing can be completed by a computer, and the computer is provided with transient state speed, pressure and direction characteristic curves. The utility model has the advantages of simple structure, low cost, convenient operation and abundant information amount, and the utility model can actually measure on engineering sites.

Description

Have rotating mechanism and can survey the device of turbulivity

Technical field is the complicated two-dimensional air velocity distribution under the utility model, the device of nonstationary flow flow parameter measurement.

For steady flow, the plane air velocity distribution generally adopts two-dimentional compound piezometric tube to measure its velocity magnitude and pressure size.To the velocity magnitude of complicated air-flows such as planar separation stream, backflow, vortex, the pressure size, the identification of velocity reversal and measurement are general with rotary type one hole piezometric tube and six hole piezometric tube.But it is not suitable for the measurement of nonstationary flow and turbulivity a hole piezometric tube.Though six hole piezometric tube can be surveyed instantaneous velocity, directivity characteristics is poor, and precision is low, and effect is bad, and complex structure, makes difficulty.

To the measurement of turbulivity, generally use hot-wire anemometer and Laser Doppler Velocimeter at present, but these two kinds of device structure complexity, cost an arm and a leg, the laser dopper flowmeter knotmeter adds suitable trace particle in the flow field domestic demand in measuring process, so use complicated operation.Hot-wire anemometer easily pollutes, and temperature influence is bigger, so will constantly proofread and correct in the measuring process, and workload is big.Present Laser Doppler Velocimeter and hot-wire anemometer are used in the laboratory more and carry out scientific research, still are difficult to realize in the engineering site actual measurement.

The present utility model is dug the purpose of making, be because there are the problems referred to above in prior art, it is actual and to measuring the turbulivity devices with low cost not satisfy engineering, easy-operating needs, and invention is dug to make and is a kind ofly had rotating mechanism and can survey the nonstationary flow velocity magnitude, the pressure size, the device of direction and turbulivity.It is simple in structure, and is easy to operate, can be used for engineering site and surveys.

For the purpose that realizes that the foregoing invention plane is made, the utility model technical application thes contents are as follows:

Have rotating mechanism and can survey the device of turbulivity, it is by probe, conversion of signals, data processing three parts are formed, its probe is for having the piezometric tube of rotating mechanism, it is the hollow thick hollow garden bar 1 of the thin back segment of leading portion that the piezometric tube of this probe has in the front end sealing, at the thin garden bar 1 of leading portion apart from the same section of a certain distance of front end 45 ° of three pressure taps 2 that circumferentially distribute uniformly-spaced, pressure tap 2 is linked to each other by the gas guide nozzle 4 of wireway 3 with garden bar 1 rear end, thick section at garden bar 1 is provided with a rotating mechanism, its turning handle 5, thick section of index dial 6 and garden bar 1 is fixed with one, pointer 7 is fixed on the sleeve 8, and sleeve 8 is fixed on the frame of axes that horizontal direction and vertical direction can both move, and is enclosed within the outside of garden bar 1 thick section.

Conversion of signals is that made semiconductor pressure sensor of semiconductor 9 and A/D plate 10 are formed by sensitive element partly.

Data processing section is finished by computing machine 11, the speed characteristic curve when having this device wheel measuring in this computing machine 11, the computing formula of aspect characteristic curve and pressure characteristic and turbulivity.

The utility model is as follows compared with the prior art:

1, the utility model, it can be to the velocity magnitude of the complicated air velocity distribution of nonstationary flow, the pressure size, direction and turbulivity are measured, and the compound piezometric tube of two dimension of the prior art etc. can only be measured the flow parameter of steady flow, though six hole piezometric tube energy measurement fluctuation velocities, but directivity characteristics is poor, and precision is low.

2, the utility model, simple in structure, cost is low, uses easy to operately, and the effective data rate height can be surveyed at engineering site.And at present Laser Doppler Velocimeter and hot-wire anemometer arranged to what the speed of UNSTEADY FLOW and turbulivity can be measured, their complex structure, make difficulty, cost an arm and a leg, the flow field domestic demand was added trace particle when Laser Doppler Velocimeter was measured, and used operation inconvenience, hot-wire anemometer easily pollutes, temperature influence is big, needs frequent calibration, and workload is big.Laser Doppler Velocimeter and hot-wire anemometer are used in laboratory at present more and carry out scientific research.

Accompanying drawing:

Fig. 1. have rotating mechanism and can survey the turbulivity schematic representation of apparatus.

Fig. 2. have the device that rotating mechanism can be surveyed turbulivity, its probe left side is surveyed and is looked synoptic diagram.

Fig. 3. have the device that rotating mechanism can be surveyed turbulivity, its probe pressure tap distribution schematic diagram.

Below in conjunction with accompanying drawing the utility model most preferred embodiment structural principle is explained in detail.

People are common in industrial reality all to be the turbulent flow of more complicated to liquid or gas flow mostly, and its flow parameter is often pulsed in time.Be difficult to obtain the percent ripple of its flow parameter with general measurement means, under lab at present Laser Doppler Velocimeter and hot-wire anemometers of adopting are measured its speed and turbulivity more.But these two kinds of device structure complexity are made difficulty, cost an arm and a leg, and use operation that more inconvenience is arranged.The innovation and creation of present inventor institute have a device that rotating mechanism can be surveyed turbulivity, its cost simple in structure is low, easy to use, it can not only record the instantaneous velocity size, turbulivity, and can record pressure size and pressure fluctuation size and flow direction.So the flow parameter that this device records is many, and quantity of information is abundant, and the effective data rate height is surveyed more convenient at engineering site.

The utility model is a kind ofly to have rotating mechanism and can survey the moving device of turbulent flow, sees Fig. 1, and it is by probe, and conversion of signals and data processing three parts are formed.This probe is a piezometric tube with rotating mechanism.At thin garden bar 1 place of piezometric tube leading portion of probe, a certain section has radially pressure tap 2, and it is linked to each other with garden bar 1 rear end gas guide nozzle 4 by wireway 3, thick section of garden bar 1 rotating mechanism is set, and it is by turning handle 5, index dial 6, pointer 7, sleeve 8 formations.Turning handle 5, thick section of index dial 6 and garden bar 1 is fixed with one, and pointer 7 is fixed on the sleeve 8, and sleeve 8 is fixed on the frame of axes that along continuous straight runs and vertical direction can both move.

The conversion of signals part is that semi-conductive pressure transducer 9 and A/D plate 10 are formed by sensitive element.

Data processing section is finished by computing machine 11, the speed characteristic curve when having this device wheel measuring in the computing machine 11, directivity characteristic and pressure characteristic and turbulivity computing formula.

Fig. 2 is that synoptic diagram is looked in the left side of this device probe, sleeve 8 is the outsides that are enclosed within garden bar 1 thick section as can be seen from Figure, the other end of sleeve 8 is the garden dish type, it is placed between turning handle 5 and the index dial 6, garden bar 1 and turning handle 5 index dials 6 one are revolved G around its axis like this changes, and rotational angle is shown by index dial.

Fig. 3 has the device that rotating mechanism can be surveyed turbulivity, and the distribution plan of its probe pressure tap can be found out at 45 ° of 3 pressure taps that circumferentially distribute in the same section of garden bar 1 thin segment interval from figure.

The utlity model has device that rotating mechanism can survey turbulivity before using, at first set up its direction, stagnation pressure and speed characteristic curve generally all are at known stagnation pressure, direction, and the standard flow field of speed obtains that these are characteristic.Speed characteristic curve during resulting wheel measuring, directivity characteristic and pressure characteristic all deposit in the computing machine 11, so that use when being for data processing.

When a certain unknown flow field is a bit measured, the probe of this device is at first moved horizontally and the tooth bar vertical moving by the leading screw of frame of axes, find the position of measuring point in the flow field, probe garden bar 1 is rotated 7 times along 45 ° of intervals such as direction around axis, obtain 8 center pit force value in turn, to find out the wherein pressure value P of maximum pressure value Pmax and left and right adjacent pressure tap ^-Max, P ⁺Max is one group of force value, and this moment, the position of its pairing three hole piezometric tube facingd the wind, and three hole piezometric tube of upwind position are gathered one group of force value, P fast ^- _{Max ' i-}, P _{Max ' i}, P ⁺ _{Max ', i '+}, i=1 wherein, 2,3 ... N.Convert pressure signal to electric signal by semiconductor pressure sensor 9, convert the electrical signal to digital signal by A/D plate 10 again and send into computing machine 11, speed characteristic curve when having wheel measuring in this computing machine 11, directivity characteristic and pressure characteristic and turbulivity computing formula.That is: $\stackrel{-}{u^{\′}{u}^{\′}}\underset{i=1}{\overset{N}{=\mathrm{\Σ}}}{u^{\′}}_1{u_1}^{\′}/N$ $\stackrel{-}{v^{\′}{v}^{\′}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{v^{\′}}_1{v_1}^{\′}/N$ $\stackrel{-}{u^{\′}{v}^{\′}}=\underset{i=1}{\overset{N}{\mathrm{\Σ}}}{u^{\′}}_1{v_1}^{\′}/N$

Wherein: u '-be x direction fluctuation velocity component;

V '-be y direction fluctuation velocity component.

Machine 11 carries out the velocity magnitude that data processing can obtain complex flow as calculated, pressure size, direction and turbulivity.

The utility model is simple in structure in a word, and is easy to manufacture, and cost is low, easy to use, can survey engineering site, and the quantity of information of measurement is abundant, the effective data rate height.By computer-controlled stepper motor, can realize all automatic measurement of said process with the A/D+D/A plate.

Claims (4)

1, has the device that rotating mechanism can be surveyed turbulivity, its probe segment has a piezometric tube, it is the thick garden bar 1 of the thin back segment of hollow front section that this piezometric tube has in the front end sealing, at garden bar 1 leading portion pressure tap is arranged, it comprises the probe with rotating mechanism to it is characterized in that this device, conversion of signals, data processing three parts, probe garden bar 1 leading portion is carefully located, same section is along circumferentially waiting 45 ° of three pressure taps 2 spaced apart, pressure tap 2 is linked to each other by the gas guide nozzle 4 of wireway 3 with garden bar 1 rear end, has a rotating mechanism to be fixed with one thick section of garden bar 1.

2, has a device that rotating mechanism can be surveyed turbulivity according to claim 1 is said, it is characterized in that this rotating mechanism, it is by turning handle 5, index dial 6, pointer 7, sleeve 8 is formed, turning handle 5, thick section of index dial 6 and garden bar 1 is fixed with one, and pointer 7 is fixed on the sleeve 8, on the frame of axes that be fixed on sleeve 8 along continuous straight runs and vertical direction can both move, and be enclosed within the outside of garden bar 1 thick section.

3, have a device that rotating mechanism can be surveyed turbulivity according to claim 1 is said, it is characterized in that the conversion of signals part of this device, it is made up of semiconductor pressure sensor 9 and A/D plate 10.

4, has a device that rotating mechanism can be surveyed turbulivity according to claim 1 is said, the speed characteristic curve of the data processing section that it is characterized in that this device when having this device wheel measuring in one, pressure characteristic, the computing machine of directivity characteristic and turbulivity computing formula is finished.

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