配方参数对镁基水反应金属燃料/水蒸汽反应特性的影响

摘要

采用可视化燃烧实验器模拟发动机的水蒸汽环境,用高速摄影拍摄燃料在水蒸汽中的燃烧过程,并用热电偶测温,研究了燃料配方参数对镁基水反应金属燃料/水蒸汽反应的影响规律.研究结果表明,镁基水反应金属燃料与水反应分快速反应和慢速反应两阶段,反应速率随时间和反应程度的增加而降低;镁基水反应金属燃料/水反应的快速反应时间和反应程度是表征燃料/水反应特性的两个关键参数;增加燃料的氧粘比和细镁粉含量、添加Fe类添加剂都可以提高燃料/水反应速率和反应程度,而增大镁含量会使燃料/水反应速率及反应程度降低.保证镁含量60%以上燃料的能量性能、工艺性能和力学性能的前提下,应尽量提高燃料氧粘比和细镁粉含量.%The reaction characteristics of magnesium-based hydroreactive fuel with water vapor were studied in the visual combustion device.The combustion reaction process of the fuel and vapor times were obtained from the high-speed charge coupled device (CCD) photographs.The combustion temperature was measured by thermal couple embed in the fuel.The reaction process of magnesium-based hydroreactive fuel with vapor consists two steps(fast and slow reaction).The time and degree at the end of the fast fuel-vapor reaction step are the key factors to characterize the reaction of the fuel and vapor.The reaction rate decreases with increasing of the reaction time and degree.The reaction rate and degree of the fuel with vapor can be increased by greater mass ratio of oxidizer to binder, higher content of fine magnesium powder,and ferrous additive.However, both the reaction rate and degree of the fuel with vapor decrease with higher content of magnesium powder.The fuel with the content of magnesium upward 60％ should have greater mass ratio of oxidizer to binder and higher content of fine magnesium powder on the premise of assuring its energy properties,technical properties and mechanical properties.