抄録
In our past study, thermal flow behavior in one-way tunnel fire was numerically predicted by Fire Dynamics Simulator (FDS). Numerical conditions are: several magnitude of heat release rate was set on the top of box at the center in tunnel, and ventilation wind velocity was gradual dropped down. Critical ventilation wind velocities, i.e. minimum ventilation wind velocity to prevent thermal flow goes upward, were estimated for each heat release rate. These results are consistent with past study by other research group. So FDS must be reasonable to simulate tunnel fire. This paper shows tunnel fire with uphill slope. Numerical results show the effect of rising gradient to critical ventilation wind velocity is very small, and when ventilation wind velocity is below critical one, the higher rising gradient, the shorter length of thermal flow goes upward.
