CN109856620B - Novel multi-tube multi-flow-velocity measurement system and measurement method - Google Patents
Novel multi-tube multi-flow-velocity measurement system and measurement method Download PDFInfo
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- CN109856620B CN109856620B CN201711241483.4A CN201711241483A CN109856620B CN 109856620 B CN109856620 B CN 109856620B CN 201711241483 A CN201711241483 A CN 201711241483A CN 109856620 B CN109856620 B CN 109856620B
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- 239000007788 liquid Substances 0.000 claims abstract description 15
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Abstract
The invention discloses a novel multitube multi-flow-rate measurement method, which is characterized by comprising the following steps of: a plurality of transceivers and antennas thereof capable of receiving and transmitting microwave signals are arranged on the outer circumference of a plurality of water pipes which are made of nonmetal materials and internally provided with flowing liquid, and a transmitter is arranged in one water pipe. Transmitting a wideband pulse signal by an antenna of a transmitter, and simultaneously receiving the signal by the antennas of a plurality of transceivers on the outer side; removing the transmitter from the water pipe; a plurality of transceivers transmit signals periodically through the antenna at the same time, and signal focusing is realized in a water pipe where the transmitters are placed; any one of the transceivers on the outside receives the signal and obtains the degree of frequency shift, and the flow rate of the liquid in the water outlet pipe can be calculated according to the Doppler principle. The invention can effectively measure different flow rates in a plurality of water pipes, and has the characteristics of quick and accurate measurement, simple system deployment, strong applicability and the like.
Description
Technical Field
The invention relates to flow velocity measurement equipment, in particular to a novel multi-tube multi-flow velocity measurement system.
Background
In the petroleum industry and in power mechanical engineering, it is often necessary to measure the flow rate of a working medium in certain specific areas to study the influence of the flow state on the working process and performance, such as pipeline leakage detection. Therefore, flow rate measurement is of great significance.
With the development of modern technology, the flow rate measuring method and corresponding measuring instrument are more and more. In petroleum industry and power machinery, the current commonly used flow rate measurement methods include mechanical speed measurement, pitot tube speed measurement, hot wire flow velocity measurement, laser Doppler flow velocity measurement and the like.
Disclosure of Invention
The invention provides a novel multitube multi-flow-rate measuring system, which aims to solve the defects in the prior art and can measure the flow rate of liquid in a water tube one by one.
The invention also provides a novel multi-tube multi-flow-rate measuring method.
The technical scheme adopted for solving the technical problems is as follows:
novel multitube velocity of flow measurement system has many inside nonmetallic material's that have flowing liquid water pipe, its characterized in that: a plurality of transceivers and antennas thereof capable of receiving and transmitting microwave signals are arranged on the outer sides of the water pipes in a circle, and a transmitter is arranged in one of the water pipes.
The transceivers capable of receiving and transmitting microwave signals and the antennas thereof are circumferentially and uniformly distributed.
The transceivers and the antennas of the transceivers capable of receiving and transmitting microwave signals are uniformly distributed around the geometric center of the water pipes.
A novel multitube multi-flow-rate measuring method is characterized in that:
firstly, placing a plurality of transceivers and antennas thereof capable of receiving and transmitting microwave signals on the outer circumference of a plurality of water pipes which are made of nonmetal materials and internally provided with flowing liquid, and placing a transmitter in one water pipe;
transmitting wideband pulse signals by the antenna of the transmitter, and receiving the signals by the antennas of the transceivers at the outer side;
removing the transmitter in the water pipe;
from the signals received by the antennas of the transceiver, the signals are:
E T (r k ，ω)＝P(ω)G F (r k ，r 0 ，ω)
obtaining the signal amplitude transmitted by the transceiver;
the transceivers outside the water pipe transmit signals periodically through the antenna at the same time with the same amplitude and phase, and signal focusing is realized in the water pipe where the transmitter is placed;
the signal amplitude of the position of the original transmitter is:
the scattered signal after focusing the signal is frequency shifted, and any one of the transceivers on the outside receives the scattered signal and obtains the degree of frequency shift according to:
the flow rate of the liquid in this pipe can be calculated.
According to the method, different water pipes are selected, and the flow velocity of liquid in all water pipes can be measured one by one.
The invention has the advantages that:
the measuring method provided by the invention can effectively measure different flow rates in a plurality of water pipes, and has the characteristics of quick and accurate measurement, simple system deployment, strong applicability and the like according to the electromagnetic wave theory, the time reversal principle and the Doppler effect.
Drawings
Fig. 1 is a process for determining amplitude phase of signals transmitted by external 8 transceivers according to an embodiment of the present invention;
FIG. 2 is a diagram of a process for amplitude phase reverse focusing of signals transmitted by 8 transceivers according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a transceiver transmitting signals in an embodiment of the present invention;
fig. 4 is a schematic diagram of a transceiver receiving signals in an embodiment of the present invention.
Detailed Description
The implementation of the present invention will be described in detail below with reference to the drawings in the embodiments of the present invention.
A flow rate measurement model of 7 water pipes is shown in fig. 1.
The water pipe material is non-metal material, such as polytetrafluoroethylene, etc.
8 transceivers 3 capable of receiving and transmitting microwave signals and antennas thereof are arranged on the outer circumference of 7 water pipes 1, and a transmitter 2 is arranged in one water pipe 1 in the middle.
8 transceivers 3 capable of receiving and transmitting microwave signals and antennas thereof are uniformly distributed around the geometric center of 7 water pipes 1.
Flow rate measurement is largely divided into two processes:
in a first process of the process,
as shown in fig. 1, a wideband pulse signal is transmitted from the antenna of the transmitter 2, and is received simultaneously from the antennas of the outside plurality of transceivers 3.
As shown in fig. 4: the receiving principle process of the transceiver 3 is as follows: the antenna receives the signal, then carries out Low Noise Amplification (LNA) and down conversion, then carries out AD conversion, and then outputs amplitude and phase by a Microprocessor (MPU), and records the amplitude and phase.
A second process of removing the transmitter 2 in the water pipe 1;
as also shown in fig. 2, 8 transceivers 3 outside the water pipe 1 transmit signals periodically at the same time with the same amplitude and phase through the antenna.
An electromagnetic field model is established according to the electromagnetic wave propagation theory and the scattering theory, and the amplitude phase of 8 transceivers 3 placed outside the pipeline is adjusted according to the received signal characteristics by the time reversal theory.
Let transmitter 2 be located at r 0 The transmitted signal is P (ω), and the surrounding transceivers 3 are located at r k The amplitude of the signal transmitted by the transceiver 3 is determined by equation (1):
E T (r k ， ω)＝P(ω)G F (r k ，r 0 ，ω) (1)
wherein G is F (r k ，r 0 ω) is a forward green function.
As shown in fig. 3: the transmission principle process of the transceiver 3 is as follows: setting amplitude, phase and waveform memory, inputting into Microprocessor (MPU), obtaining required signal, DA converting, and transmitting via amplifier (PA) with antenna.
The signal focusing can be realized in the water pipe 1 where the transmitter 2 is originally placed and is positioned at r 0 The signal at is determined by equation (2):
when the flow rate of the liquid in the water pipe 1 is different, the scattered signals after the signal focusing have different frequency offsets, any one of the transceivers 3 on the outer side receives the scattered signals and obtains the frequency offset degree, and according to the Doppler principle, the flow rate of the liquid in the water pipe 1 can be calculated according to the formula (3).
Where v is the speed of travel of the wave in the medium; v o For the moving speed of the receiver, if the receiver is close to the transmitting source, the front operation symbol is +number, otherwise, the front operation symbol is-number; v s For the moving speed of the emission source, if the emission source is close to the observer, the forward operation symbol is the-number, otherwise, the forward operation symbol is the +number. The flow rate of the liquid in this water pipe 1 can be calculated. According to this method different water pipes 1 are selected,the flow rate of the liquid in all the water pipes 1 can be measured one by one.
According to this method, the flow rates of the liquids in all the water pipes 1 can be measured one by selecting different water pipes 1.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (2)
1. A novel multitube multi-flow-rate measuring method is characterized in that:
firstly, placing a plurality of transceivers and antennas thereof capable of receiving and transmitting microwave signals on the outer circumference of a plurality of water pipes which are made of nonmetal materials and internally provided with flowing liquid, and placing a transmitter in one water pipe; transmitting wideband pulse signals by the antenna of the transmitter, and receiving the signals by the antennas of the transceivers at the outer side;
removing the transmitter in the water pipe;
from the signals received by the antennas of the transceiver, the signals are:
E T (r k ，ω)＝P(ω)G F (r k ，r 0 ，ω)
obtaining the signal amplitude transmitted by the transceiver;
the transceivers outside the water pipe transmit signals periodically through the antenna at the same time with the same amplitude and phase, and signal focusing is realized in the water pipe where the transmitter is placed;
the signal amplitude of the position of the original transmitter is:
the scattered signal after focusing the signal is frequency shifted, and any one of the transceivers on the outside receives the scattered signal and obtains the degree of frequency shift according to:
the flow rate of the liquid in the water pipe can be calculated;
the parameters described in the above formula are:
r 0 is the transmitter location;
r k is the location of the surrounding transceiver;
E T (r k ω) is the amplitude of the signal transmitted by the transceiver;
p (ω) is the transmit signal of the transmitter;
G F (r k ，r 0 ω) is a forward green function;
E(r 0 t) is the signal amplitude of the position of the original transmitter;
v is the speed of travel of the wave in the fluid;
v 0 a speed of movement for the recipient;
v s is the speed of movement of the emission source.
2. A novel multitube multiple flow measurement method according to claim 1 and characterized in that: different water pipes are selected to place transmitters, and the flow rate of liquid in the water pipes is measured.
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