A low-temperature capacitive cavitation rate measuring device
A capacitive and cavitation rate technology, applied in the direction of material capacitance, etc., can solve the problems of unsuitable stratified flow, no special instructions in low temperature environment, etc., to achieve the effect of fast measurement speed, convenient test and simple structure
Active Publication Date: 2018-09-11
ZHEJIANG UNIV
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U.S. Patent US5291791 discloses a multi-electrode device for measuring multiple flows. Its main content is to measure the average void rate by changing the electric field. laminar flow
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[0021] The present invention will be further described below in conjunction with the accompanying drawings, but the embodiments of the present invention are not limited thereto.
[0022] Such as figure 1 with 2 As shown, a capacitive device for measuring the void ratio of low-temperature two-phase flow includes an experimental pipeline 1, a curved surface electrode 2, an electromagnetic shielding layer 3, a vacuum jacket layer 4 and a data acquisition system, and the curved surface electrode 2 and the electromagnetic shielding layer 3 Attached to the tube wall of the experimental pipeline 1, and together in the vacuum jacket 4, the data acquisition system is composed of a capacitance-to-digital conversion circuit 7, an I2C bus and a computer, wherein the capacitance-to-digital conversion circuit is connected to the two sides of the experimental pipeline 1 The polar plates are placed in the vacuum layer 4 together, and the digital signal is connected to the I2C bus through the...
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The invention discloses a low-temperature capacitance type void fraction measuring device. The low-temperature capacitance type void fraction measuring device comprises an experimental pipeline, a curved-surface electrode, an electromagnetic shielding layer, a vacuum casing pipe and a data collecting system. The experimental pipeline is a non-metal insulating low-temperature fluid pipeline, and the experimental pipeline comprises an upper pipeline port and a lower pipeline port. The data collecting system comprises a switching circuit (CDC), an I2C bus and a computer; the electromagnetic shielding layer provides electromagnetic shielding for the curved-surface electrode. The low-temperature capacitance type void fraction measuring device has the advantages that according to the method, the principle of low-temperature fluid gas-liquid dielectric constant difference and a total dielectric constant changing with the void fraction is used, the low-temperature two-phase flow void fraction is indirectly measured, interference on the current field can not be caused, meanwhile, the operation is simple, the cost is low, and the response is fast.
Description
technical field [0001] The invention relates to the technical field of low-temperature refrigeration engineering, in particular to a low-temperature capacitive void ratio measuring device. Background technique [0002] Low-temperature gas-liquid two-phase flow widely exists in energy, air separation, aerospace and other fields. As an important parameter in two-phase flow, the cavitation rate is closely related to the manifold and local gas-liquid velocity; Monitoring has an important impact on the normal operation and process control of the two-phase flow system. [0003] The method of measuring the void rate in two-phase flow based on the dielectric constant has the characteristics of fast response, low cost, and no interference to the flow field, and is widely used in real-time measurement of two-phase flow, such as oil-water-gas phase content measurement, Refrigerant flow status monitoring, etc. The measurement principle is that the electrodes arranged on both sides of ...
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IPC IPC(8): G01N27/22
Inventor 张小斌王宇辰陈建业
Owner ZHEJIANG UNIV