低裂解度正癸烷物性快速计算方法

发布时间：2018-03-08 18:46

本文选题：正癸烷　切入点：裂解　出处：《推进技术》2016年08期 　论文类型：期刊论文

【摘要】：为研究正癸烷轻微裂解时物性计算方法,基于广义对应态法则建立起正癸烷裂解过程中的密度、黏度、导热系数和定压比热容的三种计算方法,包括直接计算、物性库插值计算、物性子库加权计算,在验证直接计算方法的准确度基础上,对比三种方法的计算精度、计算内存和计算时间来对其综合评估,并探究裂解度对高温物性的影响。计算温度变化范围为300~1020K,压力变化范围为1~15MPa,裂解度变化范围为0~0.25。结果表明:不同物性计算方法均能定性预测热物性的特殊变化趋势;以物性直接计算结果为基准,物性子库加权计算的误差与裂解度大小成正比;在不考虑计算内存的情况下,物性库插值计算方法能无损加速计算,低裂解度下快速工程计算可选择物性子库加权方法;裂解度对高温物性的影响显著且不可忽略。
[Abstract]:In order to study the calculation method of physical properties of n-decane in mild cracking, three methods of calculating density, viscosity, thermal conductivity and specific heat capacity of n-decane in the process of cracking are established based on generalized corresponding state rule, including direct calculation. On the basis of verifying the accuracy of the direct calculation methods, the calculation accuracy, memory and time of the three methods are compared to evaluate them comprehensively. The influence of pyrolysis degree on the physical properties of high temperature is investigated. The calculated range of temperature change is 300 ~ 1020K, the range of pressure variation is 1 ~ 15 MPA, and the variation range of pyrolysis degree is 0 ~ 0.25. The results show that different calculation methods of physical properties can predict qualitatively the special variation trend of thermal properties. Based on the direct calculation results of physical properties, the error of weighted calculation of physical sublibraries is proportional to the degree of fragmentation, and the interpolation method of physical properties library can accelerate the calculation without considering the computational memory. In the case of low pyrolysis degree, the influence of pyrolysis degree on the physical properties at high temperature is significant and can not be ignored.
【作者单位】：北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室;
【基金】：国家自然科学基金(51406005) 国防基础科研计划资助(B2120132006)
【分类号】：V235.211

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