基于零维反应近似的航空煤油裂解流动模拟及误差分析  

Simulation and error analysis of aviation kerosene cracking flow based on zero-dimensional reaction approximation

作　　者：王沈阳 罗浪 陈玉[1] 朱权[1] WANG Shen-yang;LUO Lang;CHEN Yu;ZHU Quan(School of Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《化学研究与应用》2024年第10期125-132,共8页Chemical Research and Application

基　　金：国家自然科学基金项目(91641121)资助。

摘　　要：燃料裂解反应流动传热的数值模拟是先进发动机主动冷却技术研究和设计的重要手段,然而燃料裂解反应带来的巨大计算量阻碍了数值模拟的高效完成。基于集总反应模型发展简化算法是降低裂解反应流计算量的有效途径。本文建立了基于0维反应近似的数值模拟简化算法,将RP-3号航空煤油裂解反应模型需要模拟的组分方程数减少为1,计算速度提高126%。同时对简化模型带来的误差进行了详细的研究和讨论。直通道模型的对比模拟显示,简化模型与传统模型对壁温、出口流体平均温度和转化率计算结果的最大误差分别为:0.3%,0.004%,1%。折流流动模拟结果显示,简化模型对航空煤油的质量分数模拟最大误差出现在回流区,约5%;而主流区计算误差仍然可以忽略。本文可为燃料裂解反应数值模拟及主动冷却系统分析评估提供新的方法。Numerical simulation of fuel cracking reaction flow heat transfer is an important tool for the research and design of ad-vanced engine active cooling technology,however,the huge computational volume brought by fuel cracking reaction hinders the effi-cient completion of numerical simulation.The development of simplified algorithms based on lumped reaction models is an effective way to reduce the computational volume of the cracking reaction flow.In this paper,a simplified algorithm for numerical simulation based on an approximation O-dimensional reaction is established,which reduces the number of component equations that need to be simulated for RP-3 aviation kerosene cracking reaction model to 1,and the computational speed is 2.26 times faster than that of the original model.The errors brought by the simplified model are also studied and discussed in detail.Comparative simulations of the straight-through channel model show that the maximum error distributions of the simplified model and the conventional model for the calculated results of the wall temperature,the mean outlet fluid temperature and the conversion rate are 0.3%,0.004% and 1%.The folded flow simulation results show that the maximum deviation of the simplified model for aviation kerosene mass fraction simulation occurs in the stagnation zone,which is about 5%;while the calculation deviation in the mainstream zone is still negligible.This pa-per can provide new methods and suggestions for numerical simulation of fuel cracking reaction and analytical evaluation of active cooling system.

关 键 词：碳氢燃料 裂解反应 数值模拟 简化算法 误差分析 

分 类 号：O642.3[理学—物理化学]