Numerical simulation study on temperature field of helicopter nacelle fire under non-ventilation condition

The model of fire was established for nacelle of helicopter using large eddy simulation (LES) technology. Taking oil pool fire as an investigation object, the fire scene was designed. Different ignition positions of nacelle fire were studied by simulation method. And the influences of ignition positions on heat release rate, velocity field and temperature field under non-ventilation condition were analyzed. The results show that it has a significant effect on fire propagation in nacelle when the ignition positions are changed. Meanwhile, serious damage of components occurs at the bottom of nacelle in 1/4 position due to strong fire. So, more attention shall be paid to the fire protection design. The conclusion provides a reference for design of fire protection in nacelle.