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Bottom row of the experimental study and numerical simulation work performance igniter

Author: JiangChong
Tutor: HuangYinSheng
School: Nanjing University of Technology and Engineering
Course: Military chemistry and pyrotechnics
Keywords: Formulation design Numerical calculation Bottom row ignition Wind tunnel test High-speed rotation
CLC: TQ565
Type: Master's thesis
Year: 2010
Downloads: 38
Quote: 0
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Abstract

Bottom row of work performance igniter have an important impact on the bottom row of the bomb range and accuracy , designed to fit the bottom row of the ignition point of gunpowder , the calculated results based on literature research and the bottom row igniter work environment as well as the thermodynamic calculation software design a five point gunpowder formulations , these five points gunpowder calculated product composition , the reaction temperature and the static combustion test calorimetry testing and IR analysis of the temperature measurement experiment , found the negative oxygen recipe i.e. Formulation 4 and Formulation 5 has a high heat release , and the combustion temperature and a larger flame size, to determine the two formulations as gunpowder . To spray two forms igniter end and side of the two formulations do ignition experiments under extreme environments , including semi - closed bomb experiments , the high-speed rotation experiments and wind tunnel tests . Half closed bomb experiments found that , as the film thickness increases gunpowder prone to the phenomenon of deflagration . Formula than formula 5 easy deflagration , the side spray igniter igniter easy deflagration than the end face . Two igniter can achieve ignition under high pressure relief gradient composite gunpowder . The high-speed rotation experiments in high-speed rotating segmented pressure medicine and the use Textolite material shell-and-tube ignition with little effect on the combustion flame with the speed increases with decreasing trend . Found in the wind tunnel tests , a bright band of light formed by a hot particle , particle acceleration was ejected igniter , and combustion . Compared different turbulence models and whether the radiation impact on the calculation results in the simulation under static conditions , RSM turbulence model than the standard k-ε model to calculate the value of the speed of slightly larger the radiation model added little effect on the temperature field . Derived from the high - speed rotation of the analog speed has little effect on the distribution of the axial velocity and static pressure , but can affect the composition and temperature distribution . Found in the wind tunnel environment, the analog point gunpowder combustion gas generated in the trailing vortex zone under the action of the nozzle near the mouth is closed in the vicinity of the exit nozzle , while the high temperature particles may pass through the trailing vortex zone and in the high - speed stream effect to accelerate the formation of a very long wake . The presence of a negative pressure zone at the bottom of the gas within the tube acceleration.

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