Active Cooling and Thermal Stress Reduction by Use of Porous Materials : Hollow Cylinder Model

概要

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By using the thermoporoelasticity theory proposed previously by the author, thermal stresses induced in a fluid-saturated porous hollow cylinder whose inner surface is heated by burning gas, and the wall of which is cooled by the fluid injection from its outer surface, are analyzed. Two situations of loading conditions are considered : (A) the cylinder is subjected to a sudden rise in temperature of the gas and is simultaneously pressurized at its outer surface to cool the wall, and (B) steady-state cooling is abruptly disturbed by a sudden loss of pressurization, and after a while it is recovered. The main focus is placed on the effect of heat advection due to active fluid pressurization and injection on the reduction of temperature and thermal stresses. Since the formulated problem is an axisymmetric one, the displacement field is decoupled from the temperature and pore-pressure fields which are still coupled to each other. The coupled nonlinear diffusion equations are solved by the implicit Crank -Nicolson method. It has been shown that the active fluid pressurization and injection is effective in suppressing the maximum thermal hoop stress at the outer surface without the occurrence of the excess compressional stress at the inner surface.
一般社団法人日本機械学会の論文
1993-01-15