Unraveling the role of dual Ti/Mg metals on the ignition and combustion behavior of HTPB-boron-based fuel  

作　　者：Arijit Debnath Yash Pal Sri Nithya Mahottamananda Djalal Trache 

机构地区：[1]School of Aeronautical Science,Hindustan Institute of Technology and Science,Chennai 603103,India [2]Department of Aerospace Engineering,B S Abdur Rahman Crescent Institute of Science and Technology,Chennai 600048,India [3]Energetic Materials Laboratory(EMLab),Teaching and Research Unit of Energetic Processes,Ecole Militaire Polytechnique,BP 17,Bordj El-Bahri,16046,Algiers,Algeria

出　　处：《Defence Technology（防务技术）》2024年第2期134-143,共10页Defence Technology

基　　金：the Hindustan Institute of Technology and Science for their support.

摘　　要：Metal additives play an essential role in explosive and propellant formulations. Boron(B) is widely used in propellant applications owing to its high energetic content. The addition of B to explosives and propellants increases their energy density, making them more efficient and powerful. Nevertheless, B forms oxide layers on its surface during combustion, slowing down the combustion rate and reducing rocket motor efficiency. To overcome this issue, other metal additives such as aluminum(Al), magnesium(Mg),and titanium(Ti) are revealed to be effective in boosting the combustion rate of propellants. These additives may improve the combustion rate and therefore enhance the rocket motor’s performance. The present study focused on preparing and investigating the ignition and combustion behavior of pure hydroxyl-terminated polybutadiene(HTPB)-B fuel supplemented with nano-titanium and nanomagnesium. The burn rates of HTPB-B fuel samples were evaluated on the opposed flow burner(OFB)under a gaseous oxygen oxidizer, for which the mass flux ranges from 22 kg/(m^(2)·s) to 86 kg/(m^(2)·s). The addition of Ti and Mg exhibited higher regression rates, which were attributed to the improved oxidation reaction of B due to the synergetic metal combustion effect. The possible combustion/oxidation reaction mechanism of B-Mg and B-Ti by heating the fuel samples at 900℃ and 1100℃ was also examined in a Nabertherm burnout furnace under an oxygen atmosphere. The post-combustion products were collected and further subjected to X-ray diffraction(XRD) and field emission scanning electron microscopy(FE-SEM) analyses to inspect the combustion behavior of B-Ti and B-Mg. It has been observed that the B oxide layer at the interface between B-Ti(B-Mg) is removed at lower temperatures, hence facilitating oxygen transfer from the surroundings to the core B. Additionally, Ti and Mg decreased the ignition delay time of B, which improved its combustion performance.

关 键 词：BORON B_(2)O_(3) Opposed flow burner Combustion MAGNESIUM 

分 类 号：V512[航空宇航科学与技术—航空宇航推进理论与工程] TQ560.1[化学工程—炸药化工]