| CPC G01N 25/00 (2013.01) [A62D 1/0071 (2013.01)] | 10 Claims |
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1. An experimental device for the thermal stability and re-ignition of fire foams under different heating conditions, comprising a rectangular mounting module, a convection module, a radiation module, a liquid supply module, a foam injection module, a measurement module and an intelligent control module;
the rectangular mounting module is open at the top and comprises a container, a drain valve and an iron mesh; the container is used to contain water, oil and foam; the drain valve is located at the bottom of the container and is used to discharge waste liquid; the iron mesh is located on the left side of the container and is used to prevent foam from entering the convection module;
the convection module is located on one end of the rectangular mounting module and is used to generate a high-temperature flames, the convection module applies convective heat flux to the foam inside the rectangular mounting module, causing degradation of the foam; the convection module generates convective heat flux, which simulates the destruction process of the foam under the influence of convective heat flux; the convection module comprises a combustible gas cylinder, a pressure reducing valve, a mass flow controller, a gas delivery pipeline and a rectifying device; the combustible gas cylinder is used to provide combustible gas; the pressure reducing valve is installed on the combustible gas cylinder to control the output rate of combustible gas; the gas delivery pipeline is connected at one end to the combustible gas cylinder and at the other end to the rectifying device for transporting combustible gas; the mass flow controller is installed on the gas delivery pipeline; the rectifying device is connected to the gas delivery pipeline and filled internally with fine particles, ensuring the uniform and stable flow rate of the combustible gas output; a stable flame is produced above the rectifying device after ignition and then the stable thermal convection is generated;
the radiation module is located above the rectangular mounting module; the radiation module is used to apply different degrees of thermal radiation to the upper part of the rectangular mounting module and the thermal stability of the foam can be tested under the influence of the thermal radiation; the radiation module comprises a radiant panel, a quartz glass panel, a fixture and a motion device; the quartz glass panel is located below the radiant panel to prevent flame generated by the internal combustion of the rectangular mounting module from damaging the radiant panel; the fixture secures the radiant panel and the quartz glass panel on the motion device to ensure the radiation panel moves parallel to the upper surface of the rectangular mounting module; the motion device comprises a drive device, a bracket, and a guide rail; the drive device provides power for the movement of the radiation module; the bracket is used to connect and secure the radiant panel and quartz glass panel; the guide rail enables the movement of the radiant panel along the longer side of the rectangular mounting module, thereby changing its radiation position; simultaneously, the drive device allows vertical movement of the radiant panel, adjusting the distance between the radiant panel and the container to vary the radiation size on the surface of the rectangular mounting module; the convection module and radiation module can operate together to simulate a coupled effect of convective heat flux and radiative heat flux on the foam, in practical fire scenarios, affecting the thermal stability and re-ignition of the foam;
the liquid supply module is used to supply water and oil into the container; the liquid supply module comprises a liquid container, a liquid supply pipeline, a valve, and a pump; one end of the liquid supply pipeline is connected to the water container and oil container, and the other end is connected to the container; the valve is located on the liquid supply pipeline; the pump is controlled by the intelligent control module to regulate the liquid supply rate; after opening the valve, the liquid supply rate can be adjusted by regulating the pump power; when the liquid level reaches the given height, the pump is then closed to stop the liquid supply;
the foam injection module is used to spray foam into the container; the foam injection module comprises a foam generator, a hose, a foam spraying device and a foam baffle; the foam generator is used to produce and store foam; one end of the hose is connected to the foam generator, while the other end is connected to the foam spraying device to transport foam; the foam spraying device is positioned to the right of the foam baffle and is used to spray foam; the foam baffle is used to block the sprayed foam by the foam spraying device and direct the foam into the container, thereby forming a stable foam layer;
the measurement module comprises a liquid level sensor, thermocouple, radiation monitoring device, and a camera, which are used to monitor and record the liquid layer thickness, temperature, heat flow, foam; layer shape and flame shape and height changes in the container;
the intelligent control module utilizes the parameters from the measurement module to control the liquid supply module, foam injection module, convection module, and radiation module; the intelligent control module can simulates the destruction process of foam layer under radiation, convection and combined effect of convective heat flux and radiative heat flux, thereby determining the stability of the foam and realizing the dynamic display of the liquid re-ignition process.
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