Abstract
A composite structure with a heat pipe and foamed iron-nickel composite fire suppression is proposed on the basis of the phase-change heat transfer of the heat pipe, which simultaneously attenuates the metal foam explosion energy. A numerical simulation is conducted to evaluate the feasibility of the designed construction for suppressing explosions under various thicknesses and pore diameters of the metal foam. The results demonstrate that when the foam iron-nickel metal is installed in the pipeline, the temperature reduction rate in the pipeline can reach 8.9%. The new heat pipe foam composite structure can reduce the flame temperature to 1600 K within 0.095 s. It is concluded that the heat pipe composite metal foam structure pipeline has a strong effect on suppressing combustion and explosion overpressure. Due to the combined effect of the heat pipe vacuum chamber suction energy and the foamed iron-nickel, the flame temperature decay rate increases. The maximum attenuation rate of the foamed iron-nickel for the gas explosion shock wave reaches 41.76%, and the maximum flame temperature attenuation rate reaches 64.7%. The composite heat pipe structure can quickly disperse and transfer heat, thereby effectively destroying the heat storage environment as soon as possible to prevent a secondary explosion from occurring.
Highlights
E coupling effect of explosive energy and a pressure wave often leads to increase in the degree of disaster and in the range of action [1]. erefore, blocking of the detonation wave that is generated by the secondary explosion and the propagation of the flame and timely diffusion of the explosive energy are crucial for suppressing the thermal hazard of the explosion
A pipe that is embedded with a porous wall weakens the explosive transverse wave. e maximum overpressure attenuation of the foamed ceramic can reach 51% [4]; the special three-dimensional network structure of the foamed ceramic can effectively destroy the free radicals of the gas explosion reaction, thereby blocking chain reaction and inhibiting gas explosion [5]
Metal mesh, foamed ceramics, and porous foamed iron-nickel have a satisfactory attenuation effect on the gas explosion flame. e porous material attenuates the explosive energy via multiple frictions [14]; based on the quenching effect of porous material on the flame propagation of flammable gas explosion and the suppression of pressure waves, a threelayer composite structure of steel mesh-foamed ceramicsteel mesh is proposed [15]. e propagation and impact properties of pressure waves in porous lightweight materials such as rigid foam plastics and porous aluminum are studied [16]
Summary
Due to its special pore structure, low density, high porosity, and large specific surface area, the metal foam has strong effects on flame wave and pressure wave attenuation It has been investigated in a filling tube and embedded in a tube and a flat plate, and its excellent heat transfer characteristics have been proven. It is found that the heat pipe foam composite structure can efficiently and quickly transfer the heat that is accumulated inside the pipe to the outside, and by destroying the heat storage environment inside the pipe, it was found that the heat pipe metal foam composite structure can effectively reduce the temperature of the pipe explosion pressure wave and effectively suppress the explosion It effectively prevents the thermal damage of the wave from occurring
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