Bottom Row The Ignition Performance Of The Experiment And Numerical Simulation

The performance of igniter for base bleed has a significant impact on the range and precision to the base bleed projectile. In order to design igniter powder that fit for base bleed, base on the inquiry and the igniter work environment, five igniter formulations were chosen out in virtue of thermodynamic calculation software. The analysis of calculation results of production fraction and reaction temperature, and the experiments of static combustion, reaction heat measurement, infrared temperature measurement come to the conclusions that deficient oxide formulations(formulation 4 and formulation 5) have large flame dimension, more heat, and high temperature.So the formulation 4 and formulation 5 were used for igniter powder.Some extreme environment experiments were carried out for the two formulations and two form igniter(head face and flank side face),including, the semi-closed bomb experiment, the high speed spinning experiment,wind tunnel experiment. The semi-closed bomb experiment come to the conclusion that with the increase of thick diaphragm, formulation 4, flank side face igniter is more easier to occur explosive combustion than formulation 5, head face. Both two form igniter can realize ignite to composite propellant. the high speed spinning experiment come to the conclusion that in the condition of subsection charge pressing, and glue-wood tube, spinning velocity has slight impact on combustion velocity, but, the flame dimension decrease with the increase of spinning velocity. The wind tunnel experiment come to the conclusion that the bright area is consist of high temperature granules. The granules are accelerated and combust when come out from igniter.Difference turbulence model are compared in static simulation, it indicates that velocity calculated by RSM turbulence is greater than standardκ-εmodel, the radiation model has almost no affect on temperature film. The high speed spinning simulation indicate that spinning has no significant impact on axis velocity and pressure, but can affect the specie concentration and temperature distribute. The high speed spinning simulation indicates that combustion gas was closed by vortex near the nozzle. The high temperature particle can pass through vortex and accelerated by high velocity flow, forming long locus. The negative pressure in front of igniter can accelerate combustion gas.