用于冲压发动机补燃室热防护的硅橡胶绝热层研究

Study on Thermal Protection of Silicon Rubber Insulation Used in the Ramjet Afterburner

通过分析影响冲压发动机补燃室热防护层性能的因素,研究了粉状填料和纤维填料对硅橡胶绝热层耐烧蚀性能的影响和填料的组合作用;研究了硅橡胶绝热层与发动机壳体的粘接性能,将几种偶联剂对绝热层与壳体粘接性能的影响进行了对比。结果表明,通过有机填料与无机填料以及纤维的共同作用,可以显著提高硅橡胶绝热层的耐烧蚀性能,降低其烧蚀率;WD-60偶联剂可显著提高硅橡胶与钢的粘接强度。初步探索出适合于冲压发动机补燃室热防护所用的硅橡胶绝热层配方。

The factors affecting the property of insulation material used in the ramjet afterburner were analyzed. The effects of several kinds of filler, including powder filler and fiber filler, on the ablation property of silicon rubber insulation material, and the synergistic effects of the fillers were investigated. Bonding properties between silicon rubber and the case of the ramjet afterburner were studied, and the effects of coupling agent on the bonding properties between the insulation and the case were compared. The results show that the comprehensive effects of organic fillers, inorganic fillers and fiber fillers make the ablation property of silicon rubber insulation enhance and the ablation rate lower. The coupling agent WD-60 makes the bonding strength between silicon rubber and steel enhance dramatically. A basic formulation of insulation used as thermal protection of ramjet afterburner was presented.