NGu对含RDX硝胺发射药燃烧性能的影响

为从微观的角度研究NGu对含RDX的硝胺发射药燃速压力指数改变的影响,采用改进的小型点火燃烧模拟装置,在35MPa左右对几种发射药进行低压中止燃烧实验.通过SEM电镜观察发射药在低压下燃烧的表面状况.结果表明,在硝胺发射药的燃烧过程中,NGu在燃烧表面形成较厚的熔融层,抑制了RDX的爆燃;RDX的爆燃与燃烧表面熔融层之间的"均衡状态"影响发射药燃速压力指数的变化,当RDX与NGu质量比小于1时,燃速压力指数明显降低;当RDX和NGu同时存在时,发射药的燃烧表面有针状晶体生成.

Effects of NGu on the Combustion Performance of Nitramine Propellants Containing RDX

To investigate from micro angles the effects of NGu on the pressure exponent change of burning rate of nitramine propellant containing RDX, the quenched experiments of gun propellants with RDX and NGu were carried out by rapid chamber depressurization in an ignition-and-combustion simulator under the pressure about 35 MPa. The burned surfaces of the quenched propellant samples were observed by SEM. The results show that the balance state between deflagration of RDX and melted layer of the propellants has an influence on the change of burning rate pressure exponent. The melted layer formed on the surface of the nitramine propellants containing NGu can restrain the deflagration of RDX. When the mass ratio of RDX and NGu is less than 1.0, the burning rate pressure exponent of the propellants will reduce obviously. There is an acerous crystal on the combustionending surface when the propellants have ingredients of RDX and NGu.