摘要
为了快速预测发动机冷却通道内碳氢燃料在考虑热裂解时的流动传热特性,基于正癸烷热裂解反应机理,建立了一套模拟正癸烷裂解吸热和超临界压力传热现象的快速算法。采用三维物性库查表算法计算裂解反应混合物的热物性,同时对组分输运方程进行简化,简化后只需求解1个组分输运方程。通过与现有的实验和数值结果进行比较,检验了快速算法的计算效率和可靠性。结果表明,快速算法与求解全组分输运方程的算法精度相当,但计算效率提升了约20倍。最后采用该算法对三维矩形截面冷却通道内的超临界压力正癸烷裂解与传热过程进行数值模拟,进一步考察了本文快速算法的计算精度及其工程应用价值。
To predict efficiently the heat transfer characteristics of the hydrocarbon fuel flowing inside the engine cooling channel with endothermic pyrolysis,a fast algorithm based on an n-decane thermal cracking mechanism is established for simulating the endothermic pyrolysis and supercritical-pressure heat transfer phenomena of n-decane.The three-dimensional look-up table method is adopted to acquire the thermo-physical properties of cracked mixtures.Meanwhile,the species transport equations are simplified,and finally only one species transport equation needs to be solved.The computational efficiency and accuracy of the fast algorithm are examined by comparing with the available experimental and numerical results.Results indicate that the computation efficiency is improved by about 20 times,with the computation accuracy being equivalent to that of the original algorithm,which solves fully species transport equations.Simulation of the endothermic pyrolysis and heat transfer processes of n-decane flowing inside a three-dimensional rectangular cooling channel under supercritical pressures demonstrates the accuracy of the proposed algorithm and its applicability in practice.
作者
黄世璋
阮波
高效伟
刘华雩
HUANG Shizhang;RUAN Bo;GAO Xiaowei;LIU Huayu(School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2018年第4期90-103,共14页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(11672061)~~
关键词
超临界流体
热裂解
再生冷却
正癸烷
快速算法
supercritical fluid
pyrolysis
regenerative cool ing
n-decane
fast algorithm
