Aerospace Science and Technology ( IF 5.6 ) Pub Date : 2020-10-16 , DOI: 10.1016/j.ast.2020.106269 Lin-lin Liu , Xiang He , Yin Wang , Ze-bin Chen , Quan Guo
Paraffin-based fuels are regarded as a promising solid fuel for hybrid rocket motor (HRM) owing to high regression rate, excellent mechanical performance, and high dropping point. The regression rate of paraffin-based fuels was characterized by static fire test with nitrous oxide (N2O) and gaseous oxygen (GOX) as oxidizer, and the effect of combustion catalyst, injector and chamber pressure on the regression rate was evaluated in this study. The results show that the average regression rates of paraffin-based fuel with GOX and N2O are similar under the optimal oxidizer/fuel (O/F) ratio, and the exponent n is larger with GOX as the oxidizer, indicating high sensibility to oxidizer mass flux. The average regression rate increased with the increase in swirling number , and the tangential injector with of 6.83 improved the regression rate significantly. The local regression rate unchanged with axial position when a jet injector was used, but a complex local regression rate appeared at the first half of fuel grain for tangential injector. Both copper chromite and cobalt stearate obviously increased the regression rate; however, only copper chromite could be used as a preferable regression rate improver owing to significant curing acceleration of fuels by cobalt stearate. The average regression rate slightly increased with the increase in chamber pressure with GOX as the oxidizer, but a noticeable positive relationship could be found for the cases of N2O.
中文翻译:
混合火箭发动机中石蜡基燃料的回归率
石蜡基燃料因其高的回归速率,出色的机械性能和高滴点而被认为是混合火箭发动机(HRM)的有前途的固体燃料。通过以一氧化二氮(N 2 O)和气态氧(GOX)为氧化剂的静态燃烧试验表征石蜡基燃料的回归率,并在此评估了燃烧催化剂,喷射器和燃烧室压力对回归率的影响。研究。结果表明,在最佳氧化剂/燃料(O / F)比下,GOX和N 2 O的石蜡基燃料的平均回归速率相似,且指数n当使用GOX作为氧化剂时,该值更大,表明对氧化剂质量通量具有较高的敏感性。平均回旋率随回旋数的增加而增加,并且切向喷射器具有 的6.83显着提高了回归率。当使用喷射喷油器时,局部回归率随轴向位置不变,但切向喷油器的燃料颗粒的前半部分出现了复杂的局部回归率。亚铬酸铜和硬脂酸钴均显着提高了回归率。但是,由于硬脂酸钴可显着加速燃料的固化,因此只能使用亚铬酸铜作为较好的回归速率改进剂。以GOX为氧化剂,随着室压力的增加,平均回归率略有增加,但对于N 2 O情况,可以发现明显的正相关关系。