摘要
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。
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.
作者
张家庆
刘朝晖
李宇
宋晨阳
ZHANG Jiaqing;LIU Zhaohui;LI Yu;SONG Chenyang(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2022年第1期153-161,共9页
CIESC Journal
基金
国家自然科学基金项目(51776167)。
关键词
碳氢化合物
双毛细管法
测量
黏度预测模型
绝对速率理论
状态方程
hydrocarbons
two-capillary method
measurement
viscosity prediction model
absolute rate theory
equation of state
作者简介
第一作者:张家庆(1998-),男,硕士研究生,jq_zhang@stu.xjtu.edu.cn;通信作者:刘朝晖(1985-),男,博士,副教授,zh_liu@xjtu.edu.cn。
