关键词: 铝/镁合金；水反应金属燃料；固相产物；一次燃烧；二次燃烧

Abstract: In order to explore the steady-state combustion of high-metal Al-Mg alloy hydro-reactive metalfuels for water ramjet engines，experiments were conducted to study the primary combustion and the secondarycombustion of propellant with the Al-Mg alloy content 80%.Oxygen bomb calorimeter was used to collect the sol.id products of primary combustion.The secondary combustion was simulated in the high temperature tube furnaceby using the solid products of primary combustion and water vapor.Thermal performance of Al，Mg and Al-Mg al. loy was analyzed by thermogravimetric analysis(TGA).The solid products were characterized by using scanning electron microscopy(SEM)x-ray diffraction(XRD)，chemical analysis method.TGA traces in air indicate that theoxidationonsettemperature，(530℃)of Al-Mg alloy powders is lower than that(600℃)of Mg and the oxida.tion performance of Al-Mg alloy powders is better than that of Al in case II.There were MgO，MgAl，Mg2Al3， MgAl2 produced by Mg17Al12 in the primary combustion. There were MgO，Al and Al2MgO4 in the products of sec.ondary combustion.The content of residual aluminum increases with the increasing of temperature of the tube fur. nace，and then decreases.It is thought that the combustion of magnesium in Al-Mg alloy occurs first and the com.bustion of aluminum happens later.

Key words: Al-Mg alloy；Hydro-reactive metal fuel；Solid products；Primary combustion；Secondary com. bustion