Paraffin-based fuels incorporating solid amine boranes are investigated to identify formulations suitable for use as hypergolic hybrid rocket propellants. Their ignition delays are measured following contact with 90% white fuming nitric acid droplets. The mechanical properties of the paraffin binder and of the melt layer it produces are modified using an alpha-olefin polymer. The tests are carried out at atmospheric pressure, with visible flame light emission as well as ${\mathrm{OH}}^{*}$ chemiluminescence recorded. The ignition delays measured from both signals are nearly identical, confirming that ${\mathrm{OH}}^{*}$ emission begins at the same time as the visible light emission from the boron-containing additive mixed with the fuel. Identification of the different steps of the combustion process is done with a high-speed schlieren imaging technique. Consistently shorter ignition delays are obtained by increasing the proportion of polymerized alpha olefin. The effect of this addition on the viscosity of the melt layer produced in the fuel blend upon contact with the acid is inferred from rheological measurements realized on unburned samples. The effect of alpha-olefin addition on the theoretical thermochemical performance of the fuel is also computed. The results obtained confirm that polymer-based additives can be used to control mechanical and rheological properties in a way that lowers the ignition delays of hypergolic fuel systems based on paraffin, as required for use in space propulsion applications.

对掺有固体胺硼烷的石蜡基燃料进行了研究，以鉴定适合用作高离合混合火箭推进剂的配方。在与90％的白色发烟硝酸液滴接触后测量其点火延迟。使用α-烯烃聚合物可改变石蜡粘合剂及其产生的熔体层的机械性能。测试是在大气压下进行的，有可见的火焰发光以及${哦}^{*}$记录化学发光。从两个信号测得的点火延迟几乎相同，从而确认${哦}^{*}$发射与含硼添加剂与燃料混合后的可见光发射同时开始。燃烧过程的不同步骤的识别是通过高速schlieren成像技术完成的。通过增加聚合的α-烯烃的比例可以获得持续较短的点火延迟。这种添加对与酸接触时燃料共混物中产生的熔体层的粘度的影响是从未燃烧样品上实现的流变学测量推断出来的。还计算了α-烯烃添加对燃料的理论热化学性能的影响。获得的结果证实，基于聚合物的添加剂可用于控制机械和流变性能，从而降低基于石蜡的高纯燃料系统的点火延迟，