直流电场对AP/HTPB/Al复合固体推进剂燃烧特性的影响

Effects of DC Electric Field on Combustion Characteristics of AP/HTPB/Al Composite Solid Propellant

关键词:  固体推进剂  直流电场  燃速  铝凝团  散射速度  荷质比

Key words:  Solid propellant  DC electric field  Burning rate  Al agglomerations  Scattering velocity  Specific charge

摘要:

为研究直流电场对AP/HTPB/Al复合固体推进剂的燃烧特性的影响，进行了不同电场下的推进剂药条燃烧实验；通过高速可视化拍摄方法，对推进剂药条的燃烧火焰、燃面退移过程及铝凝团运动轨迹进行了观察，分析了不同加载电压对燃烧火焰、燃速及铝凝团散射速度的影响；采用运动学分析方法计算了铝凝团粒子的平均荷质比和受力情况。结果表明：高压电场产生的离子风可以显著改变药条燃烧的火焰形状；药条的燃速随着加载电压的升高而增大，且反向电场对燃速的影响更为显著，最大可提高37%的燃速；铝凝团粒子带正电，平均荷质比约为（1.58±0.04）×10^-3C/kg，随着反向电场强度的增加，铝凝团粒子所受的电场力逐步增大，最大可达重力的19倍，散射速度逐步降低，平均散射速度最大可降低49%。

Abstract:

In order to study the effects of DC electric field on the combustion characteristics of AP/HTPB/Al composite solid propellant， the propellant grain combustion experiments were carried out under different electric fields. Propellant grain flame， burning surface regression and the motion trajectories of Al agglomerations were observed by high-speed visual photography. The effects of different loading voltages on propellant flame， burning rate and scattering velocity of Al agglomerations were analyzed. The average specific charge and force of Al agglomerations particles was calculated by kinematic analysis. The results show that the ionic wind produced by the high voltage electric field can significantly change the flame shape of the propellant grain. The burning rate of propellant grain increases with the increase of loading voltage， and the reverse electric field has a more significant effect on the burning rate， which can increase the burning rate by 37%. Al agglomerations are positively charged， and the average specific charge is about （1.58±0.04）×10^-3 C/kg. With the increase of the reverse electric field intensity， the electric field force on the Al agglomerations particles increases gradually， up to 19 times of gravity， and the average scattering velocity decreases gradually， by 49 % most.