氟化物包覆纳米铝粉对HTPB燃料燃烧性能的影响

Effect of Fluorides Coated Nano-aluminum Powder on Combustion Properties of HTPB Based Fuels

为研究氟化物包覆纳米铝粉对端羟基聚丁二烯（HTPB）燃料燃烧性能的影响，采用真空浇注法制备了含氟化物包覆纳米铝粉和不含添加物的两种HTPB燃料，并测试了在氧气流中的燃烧性能。利用NASA—CEA程序计算了两种燃料的理论比冲和绝热火焰温度。结果表明，两种燃料的退移速率都随着氧气质量密流的增加而增大，两种燃料的退移速率与氧气的质量密流关系均满足幂函数，幂函数指数分别为0．704±0．003和0．688土0．002；氟化物包覆纳米铝粉对燃料的退移速率有一定的促进作用，且这种作用不随氧化剂质量密流的变化而变化；在氧化剂质量密流研究范围内，含氟化物包覆纳米铝粉燃料的退移速率比不含添加物的燃料的退移速率高13％左右。氧气与燃料的质量比为2．0时，两种燃料在真空中的理论比冲和绝热火焰温度都达到最大值；氧气与燃料的质量比为0．4～8时，铝粉未能显著提高真空中HTPB燃料的比冲。

To study the effect of fluorides coated nano-aluminum powder on combustion properties of hydroxyl- terminated polybutadiene （HTPB） based fuels, two kinds of HTPB based fuels with fluorides coated nano-aluminum powder and without additives were prepared by a vacuum casting method and their combustion properties in gaseous oxygen flow were measured. The theoretical specific impulse and adiabatic flame temperature of fuels were calculat- ed using NASA-CEA program. The results show that the regression rates of two kinds of fuels increase with increasing the oxidizer mass flux, the relationship of regression rate vs. oxidizer mass flux for two kinds of fuels can be described by a power function and the exponents of power function for two kinds of fuels are 0. 704＋0. 003 and 0. 688 q-0. 002, respectively. The fluorides coated nano-aluminum powder has certain promoting effect on the regression rate of the fuel and this effect is not changed along with the change of the oxidizer mass flux. In the whole studied range of oxygen mass flux, the regression rate of the fuel with fluorides coated nano-aluminum powder is about 13% higher than that of the fuel without additives. The theoretical specific impulse in vacuum and adiabatic flame temperature for two kinds of fuels reach to the largest value when the mass ratio of oxygen and fuel equals to 2.0. The addition of aluminum powder does not increase specific impulse of fuel in vacuum obviously when mass ratio of oxygen and fuel is in the range of 0.4-8.