Narrow slit channel visualization experimental device and method under six-degree-of-freedom motion condition

Patent metadata

Field	Value
Publication number	US-11894153-B2
Application number	US-202117225467-A
Country	US
Kind code	B2
Filing date	Apr 8, 2021
Priority date	Jan 11, 2021
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

The present disclosure relates to a narrow slit channel visualization experimental device and method under a six-degree-of-freedom motion condition. The system comprises a six-degree-of-freedom motion simulation platform, a main circulation loop, a cooling water system, an electric heating system and a bubble monitoring system, wherein the main circulation loop is composed of an S-shaped preheater, a three-surface visualization experimental section, a double-pipe condenser, a pressurizing circulating pump, a voltage stabilizer and related equipment, wherein the cooling water system is composed of the double-pipe condenser, a plate heat exchanger, a cooling tower, a cooling fan, a cooling water tank and related equipment, wherein the electric heating system is composed of a direct-current power supply, a low-voltage power controller and a transformer, and wherein the bubble monitoring system is composed of two high-speed cameras, a PIV measuring system and an electric servo module.

First claim

What is claimed is:

1. A device for narrow slit channel visualization experiment under a six-degree-of-freedom motion condition, the device comprising:
a six-degree-of-freedom motion simulation platform having a mechanical table body, a driving system and a control system;
a main circulation loop having an S-shaped preheater, a three-surface visualization experimental section, a double-pipe condenser, a pressurizing circulating pump, a voltage stabilizer, an electromagnetic flowmeter and an exhaust valve, the main circulation loop being fixed to the mechanical table body of the six-degree-of-freedom motion simulation platform through a truss structure, wherein the three-surface visualization experimental section is connected into an ascending section of the main circulation loop through pressure-bearing bodies and an insulating flange, wherein the S-shaped preheater, the ascending section of the main circulation loop, an inner pipe of the double-pipe condenser and a descending section of the main circulation loop is sequentially connected in a welded mode, the pressurizing circulating pump and the exhaust valve communicate with an outlet section of the inner pipe of the double-pipe condenser, wherein the voltage stabilizer communicates with an inlet section of the S-shaped preheater, and wherein the electromagnetic flowmeter is mounted at the inlet section of the S-shaped preheater;
a cooling water system including the double-pipe condenser, a plate heat exchanger, a cooling tower, a cooling fan, a cooling water tank, a circulating pump and an electromagnetic flowmeter, wherein a primary side of the plate heat exchanger is connected with an outer pipe of the double-pipe condenser through a stainless steel hose to form an indoor part of the cooling water system, wherein a secondary side of the plate heat exchanger is connected with the cooling water tank and the cooling tower to form an outdoor part of the cooling water system, wherein the cooling fan is mounted in the cooling tower, and wherein the indoor part and the outdoor part of the cooling water system are respectively provided with the electromagnetic flowmeter and the circulating pump;
an electric heating system having a direct-current power supply and a controllable power transformer, wherein the direct-current power supply is fixed to a mechanical platform and heats a rectangular flow channel through electric heating rods embedded in the pressure-bearing bodies of the three-surface visualization experimental section, wherein the controllable power transformer is connected with the S-shaped preheater and outputs constant power to the S-shaped preheater, wherein the three-surface visualization experimental section is composed of the pressure-bearing bodies, the rectangular flow channel, front windows, a transparent material, side windows and the heating rods, wherein the upper and lower pressure-bearing bodies and the transparent material in the upper and lower pressure bearing bodies are fastened and connected through flanges, wherein the rectangular flow channel is defined by a rectangular groove of the transparent material and the pressure-bearing bodies, wherein the front windows and the side windows are respectively formed in the front surfaces and the side surfaces of the pressure-bearing bodies, wherein the heating rods are embedded in the pressure-bearing bodies and are electrified and heated by the direct-current power supply, so that the power control sensitivity is high, wherein a plurality of thermocouples are embedded in the pressure-bearing bodies by clinging to the rectangular flow channel along the flow direction for measuring wall temperatures; and
a bubble monitoring system having two high-speed cameras, a particle image velocimetry measuring system and an electric servo module, wherein the high-speed cameras and the particle image velocimetry measuring system are respectively fixed to a truss of the mechanical table body, wherein bubble generation and motion conditions in the rectangular flow channel are monitored at the same time through the front windows and the side windows of the three-surface visualization experimental section, respectively, and wherein the electric servo module is remotely controlled by a computer to adjust the orientations of the cameras and the particle image velocimetry measuring system.

2. The device of claim 1 , wherein the mechanical table body of the six-degree-of-freedom motion simulation platform comprises an upper table top and a lower base, wherein the driving system comprises joint hinges and six telescopic cylinders, wherein the telescopic cylinders are driven by a servo motor and are arranged in parallel, and wherein the two ends of the telescopic cylinders are connected with the upper table top and the lower base through the joint hinges, respectively, and wherein the six-degree-of-freedom motion of the upper table top is achieved through telescopic motion of the six telescopic cylinders.

3. The device of claim 1 , wherein the particle image velocimetry measuring system is composed of a laser generator and a particle image velocimetry special cross-frame CCD camera.

4. The device of claim 1 , wherein the high-speed cameras and the particle image velocimetry measuring system are used for monitoring bubble and flow field information from a wide surface and a narrow surface of the rectangular flow channel at the same time, monitoring images are processed through the computer, and three-dimensional imaging of the bubbles is achieved.

5. The device of claim 1 , wherein the thermocouples are embedded in the pressure-bearing bodies at equal intervals of every 100 mm along the flow direction by clinging to the rectangular flow channel for the wall temperature measurement.

6. An experimental method of the narrow slit channel visualization experimental device under a six-degree-of-freedom motion condition according to claim 1 , wherein water filling leakage detection and compression resistance experiments are carried out on the main circulation loop and the cooling water system before an experiment is started to ensure that the main circulation loop is leakage-free in a large-flow and high-pressure state;
before the experiment is started, the pressurizing circulating pump and the exhaust valve are started, gas in the main circulation loop is exhausted, all working media in the main circulating loop are kept to be single-phase water, and then tracer particles are injected; then, the exhaust valve is closed, and the voltage stabilizer is adjusted, so that the pressure of the main circulation loop is working condition pressure of an experimental target;
when the bubble monitoring system is started, the electric servo module is remotely controlled by the computer, and the two high-speed cameras and the particle image velocimetry measuring system are corrected according to set reference orientations;
when the cooling water system is started, valves of the indoor part and the outdoor part are kept in an open state, circulating pumps of the indoor part and the outdoor part are started respectively, and the cooling fan is started to accelerate cooling of a fluid in the cooling tower;
when the electric heating system is started, the heating power of the three-surface visualization experimental section and the S-shaped preheater is gradually and slowly increased, wherein a rise amplitude of the wall temperature of the three-surface visualization experimental section does not exceed 15 DEG C every time the heating power is increased, and after the wall temperature of the three-surface visualization experimental section and the flow of the main circulation loop are stable, next power rise operation is carried out until the inlet fluid temperature of the three-surface visualization experimental section reaches working cond

Assignees

• Univ Xi An Jiaotong

Inventors

• Zhang Kui
• Lai Zhixian
• Wang Mingjun
• Chen Chong
• Zhu Zhiming
• Zhang Jing
• Tian Wenxi
• Qiu Suizheng
• Su Guanghui

Classifications

• G21C17/032 Primary

  Reactor-coolant flow measuring or monitoring {(measuring volume or mass flow in general G01F)} · CPC title

• G01K1/14

  Supports; Fastening devices; Arrangements for mounting thermometers in particular locations · CPC title

• G01K7/02 Primary

  using thermoelectric elements, e.g. thermocouples · CPC title

• G21C17/038

  Boiling detection in moderator or coolant · CPC title

• H04N13/239

  using two two-dimensional [2D] image sensors having a relative position equal to or related to the interocular distance (H04N13/243 takes precedence) · CPC title