Solid Rocket Motor Ignition Process Characteristics Of Study

Along with the modified double base propellant performance enhancement, the solidpropellant rocket engine may use the way of free fill the modified double-base propellantto replace the charging of the wall adhered casting way the composite propellant. In thecombustion chamber, because the transmission speed of ignition fuel gas between in theinner hole and ring-like blast tube is different, the pressure difference between the holeand the ring-like channel may cause the engine work to be unusual. This paper used theFLUENT to simulate igniter pressure in combustion chamber and distributions under thecondition of the different igniter pressure, the blast tube size and the pellet size; andcarried on experiment under the conditions of different ignition namely the differentigniter pressure, obtained the experimental results. The simulation results indicated thatwhen the igniter pressure increased, the pressure in the combustion chamber inner holeand gas channel between grain and the wall surface remarkably rose, and between thetwo channels pressure difference values also obviously increase; at the end of the channelbetween the wall surface and the grain, there is the energy accumulation, and the pressurerise is obvious; the change of grain size has not affected the pressure distribution on theinner hole channel, but caused the pressure between the wall surface and the grain rising;the change at the head of the grain has not affected the pressure of the inner hole channeland the gas channel between the wall surface and the grain. The empirical datumindicated that, there is a point of intersection on the curve of static pressure at the end ofthe inner hole channel and the curve of the pressure at the end of the gas channel betweenthe wall surface and the grain. Before the intersection, because the fuel gas diffused quickalong the inner hole channel, the pressure of the hole channel established earlier, then theterminal static pressure was bigger than the ring-like channel terminal pressure; after thepoint of intersection, the pressure of ring-like channel continued to rise, and because theterminal seal caused the fuel gas to accumulate, the pressure rose obviously, the ring-likechannel terminal pressure was bigger.