Unsteady turbulence model and eddy-dissipation combustion model based on turbulence chemistry interaction was used,three dimension distribution of non-premixed combustion fire in an apartment unit was simulated numerically.

With the help of Fluent software two-phase reacting flow module, the 3D numerical simulation was performed by using eddy dissipation concept model.

The gas phase was expressed with k-ε two-equation model;the combustion was described with Eddy-Dissipation Model;the oil drop motion was described with Discrete Phase Model;the radiation was expressed with Discrete Ordinates Radiation Model.

A fire simulation of long tunnel under different fire loads and ventilation velocities was carried out by using the non-premixed combustion model which considered turbulence effect and radiation.

A temperature field simulation of arch crown in long tunnel fires,under different fire loads and ventilation velocity,was carried out,employing non-premixed combustion model which considered turbulence effect and radiation.

To understand the properties of the transfer function of parallel tube-manifold system in wind tunnel test,an analysis is made of several parameters related to the transfer function on the basis of the dissipative model with some qualitative rules on perallel tube-manifold system obtained.

According to the characteristics of the weapon system pressure signal, the dissipative model is selected as the theoretical model in this paper.