Experiment and measurement device for researching flow characteristics of two-phase pulsating flow in rectangular channel
A flow characteristic, rectangular channel technology, applied in the direction of flow characteristics, measuring devices, instruments, etc., can solve the problems of unstable pressure, long construction period, complicated operation, etc., to achieve convenient installation and operation, sufficient flow pattern development, and research conclusions. accurate effect
Inactive Publication Date: 2014-11-05
三亚哈尔滨工程大学南海创新发展基地
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These studies are mostly based on experiments on the flow characteristics of two-phase flow in rectangular channels and the flow characteristics of single-phase flow under pulsating conditions. "Study on Flow Pattern Characteristics of Two-phase Flow in the Channel", this article uses a swinging experimental system, and the flow fluctuation (a kind of pulsating flow) is generated in the experiment. This method needs to build a swinging test bench, which is not only expensive, but also takes a long time to build. , the operation is complex, and requires a lot of manpower and material resources for maintenance; another example is "Experimental Research on the Resistance Characteristics of Horizontal Tube Single-phase Water Flow under Unstable Conditions" published by Jia Hui et al. in the 2011 issue of "Atomic Energy Science and Technology". In this paper, the combination of frequency converter and centrifugal pump is used to simulate the pulsating flow, but the experimental device in this paper can only study the flow characteristics of single-phase flow, and cannot study the two-phase flow
There are generally two sources of gas working fluid used in existing research: the first is the use of air compressors, which will generate a lot of noise and vibration, which will have a great impact on the accuracy of experimental data, and at the same time There will also be problems with unstable pressure; the second method is to use heating to make water boil, which is specially used to study flow boiling heat transfer, steam-water two-phase flow
If the second method is only used to study the flow characteristics of the two-phase flow, it will not only increase the cost due to the large amount of electric energy consumed, but also increase the complexity of the experimental circuit, and also affect the insulation performance and reliability of the experimental pipeline. Security puts forward higher requirements
Both methods are time consuming and costly
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[0016] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0017] combine figure 2 , including four parts: water branch, gas branch, experiment section and collection system. Among them, the main equipment in the water branch includes a water tank 1 with a sewage pipe 2, a bypass circuit 3, a centrifugal pump 4, a frequency converter 5, a liquid flow meter 6 and a thermometer 7; the main equipment in the gas branch includes a check valve 12. Gas flow meter 13, two-stage decompression device 14 and nitrogen cylinder 15; the experimental section mainly includes a gas-water mixing device 8, a differential pressure transmitter 9 and an experimental section 10; the acquisition system mainly includes a high-definition camera 11 1. A computer 16 and a set of NI data acquisition boards 17, wherein the high-definition camera 11 is set up directly above the experimental section to shoot the flow images in real time.
[0018] The...
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The invention provides an experiment and measurement device for researching flow characteristics of a two-phase pulsating flow in a rectangular channel. According to the device, deionized water stored in a water tank is pumped by a centrifugal pump and enters a gas-water mixing device through fluid flowmeters and a thermometer; nitrogen is depressurized through a two-stage depressurization device and enters the gas-water mixing device through a gas flowmeter and a check valve; the deionized water and the nitrogen are fully mixed and enter an experimental section, a differential pressure transmitter is connected to the experimental section, and a camera is arranged above the experimental section; and the fluid flowmeters, the differential pressure transmitter and the gas flowmeter are connected with a data acquisition board, the data acquisition board and the camera are connected with a computer, and sine wave generation software in the computer generates a sine wave signal and transmits the sine wave signal to a frequency converter so as to control the centrifugal pump. The device is used for researching experiment and measurement of the flow characteristics of the two-phase pulsating flow in the rectangular channel, and is wide in research range, diversified in analysis methods, high in data measurement precision, accurate in result analysis, low in construction cost, convenient to construct and easy to operate.
Description
technical field [0001] The invention relates to an experiment and measuring device for studying the flow characteristics of two-phase pulsating flow. Background technique [0002] Two-phase flow phenomena often occur in thermal power plants and nuclear power plants. Among them, the pulsation phenomenon of gas-liquid two-phase flow is particularly important for the design and operation of many industrial equipment and systems. Therefore, many scholars at home and abroad have made some Lots of research. These studies are mostly based on experiments on the flow characteristics of two-phase flow in rectangular channels and the flow characteristics of single-phase flow under pulsating conditions. "Study on Flow Pattern Characteristics of Two-phase Flow in the Channel", this article uses a swinging experimental system, and the flow fluctuation (a kind of pulsating flow) is generated in the experiment. This method needs to build a swinging test bench, which is not only expensive, ...
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IPC IPC(8): G01N11/00
Inventor 高璞珍田竞达周豹谭思超田瑞峰
Owner 三亚哈尔滨工程大学南海创新发展基地