超临界碳氢燃料流动换热的一维模型

考虑水平圆管内燃料流动换热过程和裂解反应及结焦过程之间的相互影响,提出一个一维稳态模型来研究碳氢燃料的流动换热过程与裂解反应的耦合特性。选用正癸烷作为替代燃料,裂解反应采用正癸烷裂解的一步总体化学反应模型,结焦过程采用一维结焦工程模型进行数值模拟,结果表明裂解反应能够强化换热。选择不同的管壁面热流密度、进口压力和质量流量等典型工况进行模拟,表明流动换热过程影响燃料裂解反应速率和在管内的驻留时间,从而影响裂解度。计算结果与实验数据的对比表明了程序的可靠性,加上一维程序计算效率高的优点,可将应用于快速工程计算,并为三维数值模拟提供支持。 

One dimensional model of flow and heat transfer of supercritical hydrocarbon fuel

Considering the mutual influence between fuel flow and heat transfer process and pyrolysis reaction and coking process in horizontal circular tube,a one-dimensional steady-state model was proposed to study the coupling characteristics of hydrocarbon fuel flow and heat transfer process and pyrolysis reaction.n-decane was chosen as the alternative fuel,pyrolysis reaction used one-step chemical reaction model and coking process used a one-dimensional coking engineering model for numerical simulation.The overall results showed that the pyrolysis reaction can strengthen heat transfer,and different wall heat flux,inlet pressure and mass flow rate were chosen to simulate the typical working conditions.The overall results showed that flow and heat transfer process influenced fuel's pyrolysis reaction rate and dwell time in the tube,thus affecting pyrolysis ratio.The comparisons of the calculated results with the experimental data show the reliability of the program,which can be applied to swift engineering calculation combined with the advantage of high calculation efficiency,and will provide a support for three-dimensional numerical simulation.