时间与温度依赖的RP-1煤油凝胶本构方程建模

Time and Temperature Dependent Constitutive Equations Modeling of RP-1 Jet Fuel Gel

根据凝胶特殊的固-液形态,研究了无机和有机凝胶剂与RP-1煤油的成胶机理,通过Brookfield流变仪测量流变参数,并构建出煤油凝胶的非时间依赖、时间依赖和温度依赖的本构方程。结果表明:加入无水乙醇有利于凝胶剂A(一种干性油衍生物)对煤油的凝胶化;无机煤油凝胶的稠度系数k和凝胶剂含量Y_(amout)具有幂律函数关系;由于幂律指数n为负,制备的煤油凝胶比典型的剪切变稀流体(0<n<1)的稀化能力更强;无机和有机煤油凝胶的复凝性很弱且不受凝胶剂含量和类型的影响;随剪切速率的增大,凝胶从完整结构到完全破坏结构状态所需的时间缩短,中间过程曲线的振幅减小;随温度的增加,无机煤油凝胶的粘度先减小后增大,有机煤油凝胶的粘度逐渐减小并在90℃接近煤油的粘度。

According to the special solid-liquid state of gel, the gelation mechanism of gel agents （inorganic（B） and organic（A） ） for gelation aviation kerosene RP-1 were studied. The rheological parameters were measured by Brookfield rotational rheometer. Finally, the time independent, time dependent, and temperature dependent constitutive equations were built. Results show that the anhydrous ethanol is advantageous for the gelation of kerosene by gel agent A. The consistency coefficient k and gallant amount Ya have a relationship of power law dependence. The thinning ability of the kerosene gel prepared is stronger than that of typical shear thinned fluid（0〈n〈1 ）. The resilience of inorganic and organic kerosene gel is very weak and not affected by the gel content and type. When shear rate increases, the time needed from intact structure to completely destroyed structure of the gel decreases, and the amplitude of the process curve decreases. When the temperature increases, the viscosity of inorganic kerosene gel decreases first and then increases,while the viscosity of organic kerosene gel decreases gradually and get close to the viscosity of kerosene at 90℃.