Abstract: the periodic pulsation flow with the introduction of the turbine meter scale measurement precision influence information produced by excellent
flow meter, flow meter manufacturer to offer you the quotation.
Abstract: the almost total pipe flow resistance stability, both under the laminar flow turbulence, those conditions always exist all kinds of interference.
If some parameters such as pressure, flow of the fluid velocity and density for the outbreak of transformation, is called the flow pulsation flow.
More flow meter manufacturers choose model price quote you are welcome to inquire, here is a periodic pulse flow impact on the turbine meter scale measurement accuracy of introduction for details.
Almost the total pipe flow is to resist the steady, both under the laminar flow turbulence, those conditions always exist all kinds of interference.
If some parameters such as pressure, flow of the fluid velocity and density for the outbreak of transformation, is called the flow pulsation flow.
Pulsating flow can happen measurement precision of instrumentation, solemn will cause distortion measurements, so on chemical industry need to discussion in the process of the flow pulsation effects on flowmeter measurement precision.
This paper introduces the periodic fluctuating flow analysis of turbine flowmeter measurement precision influence, for readers' reference.
1, the pulsating flow measurement of empty way almost total pipe flow resistance stability, both under the laminar flow turbulence, those conditions always exist all kinds of interference.
If some parameters such as pressure, flow of the fluid velocity and density for the outbreak of transformation, is called the flow pulsation flow.
Pulsating flow can happen measurement precision of instrumentation, solemn will cause distortion measurements, so on chemical industry need to discussion in the process of the flow pulsation effects on flowmeter measurement precision.
Pulse time is everywhere, but it is difficult to measure.
Direct measurement of pulsating flow is almost can not, we can only measure the pulse of the primary parameters, such as amplitude, frequency and waveform, etc. , then elucidated the pulse from these parameters might bring what kind of impact to the instrument output.
Even measure the parameters of the pulse is not an austerity, on the run from the solution is to use a few especially instrument for pipe flow fluid acoustic expound to measure the pulse parameters.
If the pulse frequency is low, not ling first pipe flow meter has been assembly or pressure transmitter can use frequency limit, such as from the output of the pressure gauge pointer swing can teach pulse.
But to realize pulse of each parameter value need specific measurements.
The research found that pulse related to flow velocity and has nothing to do with the static pressure.
Thus, available measurement qVrms/qV (
QVrms is zui the size of volume flow pulsation value;
QV is the average of the volume flow of)
To realize pulse situation.
The following is a measurement qVrms/qV way: (1) measuring pulse amplitude, can assume VRMS/v≈
QVrms/qV, average flow velocity v refers to the tube, VRMS is zui big pulsating quantity of tube flow velocity.
Can be close to the flow meter in the pipe insert the upstream a thermal anemometer probe (
Hot wire or thermistor)
And use an online intends to show the square of velocity zui big pulsating quantity machine.
(2) when the flow meters close to the pulse source (
Such as where are smaller than the wavelength of the pulsating quarter)
Pulse amplitude and pulse source.
Can from the volume of a pulse source, such as rotation speed change could estimate the amplitude.
Although this method is not very reasonable, but it does not need to use other instrument.
(3) if the flow meter is a differential pressure meter, to export pulse amplitude, is measured at austerity device of differential pressure pulsation amplitude & Delta;
人口、难民和移民事务局/Δ
PPS the results will be used to roughly expect the pulsation amplitude.
This value is along with the change of pulse frequency changes, from the following equation can be launched qVrms/qV zui possible values: qVrms/qV≤
Δ
人口、难民和移民事务局/Δ
PPS type: & Delta;
PRMS zui big pulsating quantity for differential pressure, & Delta;
PPS for the steady state flow measure differential pressure.
Elucidating the flow transmitter output spectrum of primary data, so as to take the pulse conditions.
Assume that pulsating frequency is not far beyond the corresponding range of flow transmitter, so in the spectrum of the output signal, theory by using Fourier spectrum instrument can measure pulse frequency.
2, periodic pulsation flow influence on turbine flowmeter measurement precision of explanation by 2.
A mathematical model of fostering and the dynamic characteristics of turbine flow meter when the pulsation frequency beyond a certain range, the measured value of the turbine flowmeter is bigger mistakes will happen.
Mistakes on the origins of the first has the following several aspects: the resonance of the rotor blades, gear meshing (
Flexible output of the turbine meter)
And gear, the rotation inertia, the shape of a pulsating flow, shaft friction resistance, etc.
Because the total pulse is composed of sine wave superposition, so that from the exposition of sine pulse impact on the measured value of the turbine flowmeter to elucidate the influence of the periodic pulse situation.
Theory and indicates the action to participate in sinusoidal unchanged to the system, the response under the condition of special riot is similar frequency sinusoidal output, but the amplitude and phase is determined in the specific system dynamic characteristics.
Speed of turbine flowmeter is a kind of instrument, it was based on the momentum conservation principle of primitive, fluid ambush turbine blade, make the turbine rotation, the rotation of the turbine speed changes over flow, terminal from the turbine to calculate flow value, let the magnetoelectric changing device (
Or rigid output device)
Turbine speed change into electrical impulses, and wanted to show into the secondary instrument, moment electrical pulses by the unit number and the total number of electrical pulses reflect the instantaneous flow and cumulative flow.
Beijing Sincerity Automatic Equipment Co., Ltd have expanded from facilitating conversation and collaboration in the identity industry to providing strategy consulting services, research, analytics and education.
You will find a wide variety of for sale for virtually any
fork density meter manufacturer needs. Keep in mind how you plan to use the , and talk with a professional about the model and features that are right for your application. Go to Sincerity Flow Meter for on sale.
Making a few technical tweaks to the way you structure and distribute mass flow meter could be the difference between an engaging, thought-provoking product and a perfunctory one.
