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

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.