Research On Detecting Reconstructive And Simulated Experimental Technology For Temperature Distribution Of An Explosive Fireball

In order to satisfy the testing needs in temperature field detection and reconstructive imaging of explosive fireball,a fireball characteristic spectral detective method,a multi-objective optimized iteration based temperature distribution reconstructive method and a fireball multiple physical quasi static simulated experimental method were proposed.According to the excitation spectrum of intrinsic and quasi doped elements in the explosive fireball,a multi-channel optical filtered projection detective method based on element’s emission spectrum was designed.Research on theoretical analysis and calculation model of geometric light path of projection process in pinhole imaging model and cone beam model were also carried out.Classify the temperature distribution iterative reconstruction problem based on multichannel projections of the explosive fireball as a many-objective optimization problem and an iterative reconstructive method of the high temperature distribution was designed by both combining the projective light path model and using the non-dominated sorting genetic algorithm based on reference point strategy.Reconstructive ability of the algorithm was tested and analyzed by establishing 2-D and 3-D numerical simulative experiments.By using multi-pipeline injection technology,a fireball multiple physical quasi static simulated experimental method were proposed.Area temperature distribution and particle velocity distribution in the constructed simulation airspace model of multi-channel injection scheme were simulated based on computational fluid dynamics.The prototype of the simulated equipment were built after the design of mechanical structure,hardware circuit and software program.The theoretical and experimental results show that the characteristic spectral filtered detecting imaging of can be realized according to the characteristic wavelengths of potassium(K)and copper(Cu)in the explosive fireball.The minimum standard error of 3-D reconstruction of temperature field based on multi-objective optimized iteration can reach 5.30% or even less.The simulation of high temperature fireball at 1500℃ and above can be realized by multi-channel doping injection.