Analysis And Improvement On Anomalism Peak Of A Kind Of Solid Rocket Motor

Analyzing the anomalism peak appeared at 2.2 second on the pressure curve during a solid rocket motor being tested is taken as background in this paper. Through inner ballistic digital emulation and fluent calculation to the ignition motor and the main motor, we can analyze anomalism problem of the motor ignition test, determine failure, improve designation and do validation test.There are four parts as below included in this report:In order to judge whether a solid rocket motor inner ballistic pressure curve and performance is normal or not during first ignition test, it's required to emulate inner ballistic of the motor and the ignition motor. At first, the ignition motor designation is developed, which includes: general parameters of ignition motor, optimization of ignition grain, experimental designation and finite member intension check of ignition motor shell, ignition case designation and etc. Applying solid rocket motor inner ballistic performance digital emulation software and Zero-Dimension inner ballistic mathematics model, we can get the ignition motor ballistic emulation curve.Then inner ballistic of the motor ignition and start up is emulated, while still applying Zero-Dimension inner ballistic mathematics model and using solid rocket motor inner ballistic performance digital emulation software, and adding up the ignition grain gas to the main motor grain gas. Simplifying the main motor grain to Tow-Dimension burning, using Fluent motive grid technology, we can do motor instant inner flow calculation, get flow velocity, pressure, temperature and mach number at one time, and analyze motor work process and inner ballistic performance.According to the inner ballistic emulation result of the motor ignition and start up, we judge that there is anomalism pressure peak in the motor ignition test ballistic curve. After analysis and exclusion, the reason is that the nozzle throat is jammed by not melt ignition motor shell. It will influence motor ignition reliability, we must improve it.Finally improvements on this ignition motor are introduced, mainly about ignition motor shell optimization. Later validation test proves those are effective.From now on, the solid rocket motor ignition designation is brought to success perfectly.Through this study about design and optimization of ignition motor, we get: the integral global head ignition motor can effectively resolve the anomalous peak value of pressure because the nozzle throat is jammed by not melted global seal cover after ignition motor works, which is applicable in all kinds of solid rocket motors, especially those whose grain length is short and nozzle diameter is small, and improve ignition reliability.