Numerical Calculation And Analysis Of Inclined Long Channel Fire

Long and narrow channel fires have the characteristics of rapid development,high damage,and difficulty in prediction.With the increasing number of narrow and long channels,the scale is getting bigger and the structure is getting more and more complicated.The research significance and difficulty of narrow-lane fires,especially irregular complex narrow passages,are increasing.Tilt,complex narrow channel calculations are more complicated than relatively regular narrow channels.A large number of oblique narrow channels were generated by FDS modeling,and the results of numerical simulation were trained as BP samples using BP neural network,and the reliability of the trained neural network was verified.The following conclusions were obtained:1)FDS as a fire numerical simulation software to study the relative test platform of fire research can economically obtain more accurate data.This paper calculates and calculates the inclined long and narrow channel with a tilt angle of 100 m from-60°to60°.Fire parameters for each working condition: temperature,smoke concentration,visibility,CO concentration values and trends.2)Neural networks can fit any curve,especially on some complex nonlinear problems.By constructing a BP neural network and repeatedly training the data of each working condition,after adjusting the parameters,appropriatelya network can be obtained that can accurately output the fire parameters of the narrow channel under different dip angles.3)By verifying the trained network,it is found that the narrow channel with the same length can also be calculated using the network with the same inclination angle corresponding to the same tilt angle,the calculation result can effectively reflect the change of the actual value in the trend,the error between the value and the actual value is between10%-15%;at the same oblique angle,the narrow passage of the opening blocking ratio is changed.When the blocking is small,The result of network calculation is between 10%-18%,calculation results have a certain accuracy.When the blocking ratio reaches 30%,the error gradually increases;the complex narrow channel composed of the horizontal narrow channel and the vertical narrow channel is calculated by using the network with the corresponding inclination angle.In addition to the accuracy of the parameters of a small number of working conditions,the overall error is increased.