A Study On Combustion PErformance And Application Of A New Type Of Water-insensitivity Ignition Mixture

Ignition mixture is an important category for pyrotechnic devices, among which the water-resistant ignition mixture is a typical one. Its performance will directly affect the properties of many pyrotechnic systems. Based on the analysis on the domestic and foreign development of ignition mixture, some detailed and systematic researches have been done in this dissertation, which are as follows:(1) By the analysis on the advantages and disadvantages of the water-resistant ignition mixture as well as the reasons of the disadvantages, the goals and the methods of the improvement were proposed, the improvement on the water-resistant ignition mixture was performed, and the preparation process was determined. Theoretical analysis and testing results demonstrated that Viton, a new substitute of the former plasticizer, could noticeably improve its performances, which has been proved as the important improvements of the mixture. Due to the favorable thermochemistry performance, dicyandiamide can act as a good combustion-rate regulator. The addition of antistatic agent can desirably increase the antistatic capability of the mixture, and the testing results showed that the performance of the improved mixture was excellent.(2) The effect of each component in the mixture on its combustion performance was studied systematically. The effects of the content, granularity and purity of the raw materials (Zirconium powder, Viton and dicyandiamide) on the combustion rate were measured and their effects on its detonation heat and its combustion heat were estimated. The investigation on the combustion reaction mechanism showed that surface decomposition of dicyandiamide was the control step of the combustion reaction. The slowdown and combustion-resistant effects of dicyandiamide were of endothermic characteristic. Viton made a great contribution to the heat output of the mixture.(3) On the background of the development of an ignition rocket, some application investigations have been carried out. Some parameters related to water-resistant ignition mixture, the charge of ignition rocket, such as heat-flow, density of charges, structure of charges, coating and its process, area ratio of nozzle and high temperature corrosion of the nozzle, were calculated and studied, respectively. On the basis of the above studies, an ignition rocket was successfully developed.(4) The application of Artificial Neural Network in the field was studied. By BP (back-propagation networks) Neural Network and rational choice of the calculation factor, the relation between the improved mixture composition and combustion rate, and that between the charge of ignition rocket and p-t curve were simulated. The model could exhibit in essence the inherent relation and the forecasted results were in good agreement with the actual testing results, which showed that the model could be used as a guide for the design of the composition and the ignition engine, and that Artificial Neural Network could be employed in the field for the purpose of reducing experimental work of hazardous materials.