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Rod bundle channel local area gas-liquid two-phase annular flow liquid film thickness instantaneous conductivity measurement system

A technology of liquid film thickness and local area, which is applied in the field of instantaneous conductance measurement system of gas-liquid two-phase annular flow liquid film thickness in the local area of ​​rod bundle channel, which can solve the limitation and cannot obtain the behavior of complex rod bundle channel annular flow liquid film Characteristics and other issues, to reduce the impact and ensure the effect of normal use

Active Publication Date: 2019-11-22
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current conductometric liquid film thickness method mainly uses double rings embedded in a simple geometric structure, which is limited to the measurement of the average liquid film thickness in the axial section, and cannot obtain the behavioral characteristics of the annular flow liquid film in the local area of ​​the complex rod bundle channel.

Method used

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  • Rod bundle channel local area gas-liquid two-phase annular flow liquid film thickness instantaneous conductivity measurement system
  • Rod bundle channel local area gas-liquid two-phase annular flow liquid film thickness instantaneous conductivity measurement system
  • Rod bundle channel local area gas-liquid two-phase annular flow liquid film thickness instantaneous conductivity measurement system

Examples

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Effect test

Embodiment 1

[0067] see Figure 1 to Figure 5 , a gas-liquid two-phase annular flow liquid film thickness instantaneous conductance measurement system in the local area of ​​the rod bundle channel, mainly including a rod electrode unit, several electrode pairs, a signal generation module, a signal acquisition module, a data processing module, a liquid film calibration device and impedance adjustment circuit.

[0068] Further, in this embodiment, according to the characteristics of the square array rod bundle channel, that is, the central region of the rod bundle subchannel and the rod gap region have symmetrical geometric structures, and the gas-liquid two-phase hydrodynamic characteristics are significantly different, the central region of the rod bundle subchannel and the rod gap region are selected The location of the electrode arrangement is used as the measurement of the thickness of the annular flow film in the local area.

[0069] The rod electrode unit is a hollow cavity with open...

Embodiment 2

[0127] The instantaneous conductance measurement system of gas-liquid two-phase annular flow liquid film thickness in the local area of ​​the rod bundle channel mainly includes a rod electrode unit, several electrode pairs, a signal generation module, a signal acquisition module, a data processing module and a liquid film calibration device.

[0128] The rod electrode unit is a hollow cavity with open upper and lower ends.

[0129] Two ends of the rod electrode unit are respectively socketed with a rod bundle forming an annular flow channel.

[0130] The outer wall of the rod electrode unit has n slots. The card slot is provided with openings for passing through the signal input transmission line and the signal output transmission line.

[0131] The electrode pair is arranged in the slot of the rod electrode unit.

[0132] The electrode pair includes a receiving electrode and an exciting electrode.

[0133] The signal generating module sends an excitation signal to the exci...

Embodiment 3

[0141] The instantaneous conductance measurement system of gas-liquid two-phase annular flow liquid film thickness in the local area of ​​the rod bundle channel, the main structure is shown in Example 2, in which several electrode pairs are arranged in the circumferential direction of the rod electrode unit at an interval of 45°.

[0142] Wherein, the size of the receiving electrode 3 is 4x0.8mm. The dimensions of the excitation electrodes 4 are 2x0.8 mm. The frequency of the excitation signal applied to the excitation electrode 4 is 10 KHz, and the applied current is alternating current.

[0143] The axial distance between the receiving electrode 3 and the exciting electrode 4 is 2 mm.

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Abstract

The invention discloses a rod bundle channel local area gas-liquid two-phase annular flow liquid film thickness instantaneous conductivity measurement system. The instantaneous conductivity measurement system mainly comprises a rod electrode unit, a plurality of electrode pairs, a signal generation module, a signal acquisition module, a data processing module and a liquid film calibration device.The thickness of the annular flow liquid film in the local area of the rod bundle channel can be accurately measured; and the Dryout type critical heat flux density triggering condition can be accurately predicted by determining the uneven distribution characteristic of the rod wall circumferential liquid film thickness and the liquid film circumferential cooperative propagation mechanism, so thatthe normal use of related elements of a nuclear reactor system and the safety of a reactor under accident working conditions are guaranteed.

Description

technical field [0001] The invention relates to the industrial field, in particular to an instantaneous conductance measurement system for gas-liquid two-phase annular flow liquid film thickness in a local area of ​​a rod bundle channel. Background technique [0002] As an important flow pattern in gas-liquid two-phase flow, annular flow is commonly found in nuclear reactor related components and equipment, such as the core of a boiling water reactor under normal conditions and the core and steam generator of a pressurized water reactor under accident conditions , and its research is the basis for the reliable operation of equipment and the safety analysis of reactors under accident conditions. The typical characteristic of annular flow is that part of the liquid phase flows in the form of a liquid film against the wall, and the rest of the liquid is entrained by the high-speed flowing gas. The annular flow liquid film is composed of a smooth liquid film base and a disturba...

Claims

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Application Information

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IPC IPC(8): G01B7/06G01N27/04
CPCG01B7/06G01N27/041
Inventor 何辉潘良明吴瑶魏列张牧昊周文雄
Owner CHONGQING UNIV
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