横向过载对固体火箭发动机推进剂点火建压过程的影响

The high acceleration is found to alter the internal ballistic performance and induce ignition abnormalities by changing the internal flow and combustion state in the rocket chamber.To demonstrate the mechanism of interior ballistics as the results of acceleration loads imposed, the modes of the acceleration field effect, acceleration combustion effect, and erosion combustion characteristics are developed and first taken into in a new ignition model.The transient pressure in combustion chamber and the proportion of erosion and acceleration effects versus time are obtained. The relationship between propellant flame propagation speed and pressure rise rate is proposed. The results show that the peak-pressure is increased under the condition of positive acceleration and weakened under the condition of negative acceleration. Under the condition of positive acceleration, the front section of propellant is mainly affected by the acceleration-combustion, and the rear section is mainly affected by the erosion-combustion. By intensifying upstream combustion, the downstream erosion effect is aggravated by the positive acceleration. The negative acceleration is found with a less weakening effect on the combustion of propellant in the rocket, both in magnitude and time duration.The moment of peak of flame-spread velocity is almost identical to the moment of ignition of the entire propellant grain and the peak of pressure-rate.Therefore, the pressure-rise rate of the pressure data obtained in the experiment can be suggested to analyze the surface combustion of propellant.