碳氢燃料JP-10高温液态黏度测量和推算模型构建方法研究

基于流体动力学层流哈根-泊肃叶（Hagen-Poiseuille）定律，利用双毛细管法，对高密度空天动力燃料JP-10液态黏度进行实验测量，测温范围326.6~671.2 K，测量压力2.0、 3.0、 4.0 MPa，扩展相对不确定度2.88%~4.96%（置信因子k=2）。通过纯物质环己烷动力黏度的测量，对实验系统进行了标定，实验结果与NIST数据库平均相对偏差在1.22%以内，最大相对偏差绝对值为2.04%，实验结果与推荐黏度值在2.0 MPa时平均相对偏差为1.25%，4.0 MPa时平均相对偏差为1.61%，最大相对偏差绝对值为3.50%，验证了实验系统的可靠性。选取临界压力状态的黏度值作为参考状态值，通过引用Yaws液相有机化合物的黏度经验公式，结合SRK状态方程对绝对速率理论黏度模型进行了改进，耦合实验数据，建立了一种适用于碳氢燃料的高温高压液相黏度的推算模型。采取共轭梯度法和遗传算法对模型参数进行拟合，计算结果与实验结果的平均相对偏差值在2.00%以内，最大相对偏差绝对值小于4.50%，验证了模型的精确性。

Viscosity measurements and prediction model construction for liquid JP-10 at high-temperature conditions

Based on the laminar Hagen-Poiseuille law of fluid dynamics, the liquid viscosity of high-density hydrocarbon fuel JP-10 was measured by a two-capillary method. The measured temperature range was 326.6—671.2 K and the measured pressure was 2.0, 3.0, 4.0 MPa. The extended relative uncertainties of the measured dynamic viscosities were identified as 2.88%—4.96% (coverage factor k=2). The experimental system was calibrated by measuring the dynamic viscosity of the pure substance cyclohexane. The average relative deviation between the measured results and NIST data was less than 1.22%, the maximum absolute value of relative deviation was 2.04%, and the average relative deviation between the experimental results and the recommended viscosity value is 1.25% at 2.0 MPa, 1.61% at 4.0 MPa. The absolute value of the maximum relative deviation is 3.50%, which verified the reliability of the experimental system. The viscosity value of the critical-pressure state was selected as the reference state value. By referring to the viscosity empirical formula of Yaws liquid phase organic compounds and combining with SRK state equation, the absolute rate theoretical viscosity model was improved. Coupling with the experimental data, a prediction model for the liquid-phase viscosities of hydrocarbon fuels at high-temperature and high-pressure conditions were established. The conjugate gradient method and genetic algorithm were used to fit the model parameters. The average relative deviation between the calculated results and the experimental results was less than 2.00%, and the absolute value of the maximum relative deviation was less than 4.50%, which verified the accuracy of the prediction model.