Moisture flow measurement method integrating vortex street frequency and convection characteristics
A vortex frequency, flow measurement technology, applied in the measurement of flow/mass flow, liquid/fluid solid measurement, volume/mass flow generated by mechanical effects, etc., can solve the problem of single signal, difficult calculation and processing, simple processing method, etc. problems, to achieve the effect of a wide range of applications, convenient hardware structure, simple and efficient methods
Active Publication Date: 2020-09-11
TIANJIN UNIV
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Problems solved by technology
On the one hand, the false height of the vortex flowmeter in the mist flow brings a large error to the flow measurement, which limits the application of the vortex flowmeter in two-phase measurement; on the other hand, the traditional vortex flowmeter Using a single probe for measurement, the obtained signal is very single, and the processing method is relatively simple, it is difficult to apply other methods for calculation and processing, which also limits the improvement of its accuracy
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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in conjunction with the accompanying drawings and implementation.
[0035] This example is the specific implementation of the wet gas flow measurement method that combines vortex street frequency and convection characteristics in the measurement. The working conditions are: the experimental measurement of the pipe section pressure P = 300kPa, the gas phase volume flow rate Q g =17m 3 / h, liquid volume flow rate Q l =0~5ml / s.
[0036] The first step is to collect signals, using piezoelectric probes and signal conditioning circuit board structures. The piezoelectric probe collects the vortex signal, then amplifies and filters it through the signal processing circuit, and finally uses the signal acquisition card to transmit the vortex timing signal to the PC and save it. The installation method of the dual piezoelectric probe ...
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The invention relates to a moisture flow measurement method integrating vortex street frequency and convection characteristics. An adopted measuring device comprises a vortex generator and double piezoelectric probes which are arranged in a measuring pipeline. The double piezoelectric probes are fixed at the downstream of the vortex generating body, and comprise a front piezoelectric probe and a rear piezoelectric probe which are installed on the opposite sides. The double piezoelectric probes carry out signal collection through piezoelectric sensitive elements, signal processing and amplification are carried out through a signal conditioning circuit, vortex street signals are output, vortex street frequency is obtained on the basis of FFT conversion, and fog flow vortex street flow measurement is carried out through a related speed measurement method.
Description
technical field [0001] The invention belongs to the field of gas-liquid two-phase flow measurement, and relates to a wet gas flow measurement method combining vortex street frequency and convection characteristics. Background technique [0002] Karman vortex street is an important phenomenon in fluid mechanics. When the fluid flows through a bluff body, vortex shedding occurs alternately on both sides of the bluff body, and a vortex street is formed in the wake. The flow rate can be measured by measuring the shedding frequency of the vortex street. Vortex streets are widely found in chemical, aerospace, petroleum and other industrial fields. Accurate measurement of vortex flow field flow is of great significance for process control and production safety of industrial production. [0003] In recent years, vortex flowmeters have been widely used in single-phase flow measurement, and the stability and accuracy of vortex flowmeters in single-phase measurement have also been reco...
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Login to View More IPC IPC(8): G01F1/32
CPCG01F1/32G01F1/325
Inventor 孙宏军宋晨睿李金霞李潇亮
Owner TIANJIN UNIV