基于LIEF的喷雾数值仿真模型验证  

Verification of Spray Numerical Simulation Model Based on LIEF

作　　者：李岩松 崔明利 李雪松[1] 许敏[1] LI Yansong;CUI Mingli;LI Xuesong;XU Min(Institute of Intelligent Vehicle,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学智能汽车研究所,上海200240

出　　处：《车用发动机》2023年第6期61-67,共7页Vehicle Engine

基　　金：国家自然科学基金(E52276125,E52006140,E51876126);湖南省科技创新计划(2020RC5021)。

摘　　要：为了进一步探索发动机内部的空气燃料混合特性,基于Converge软件的O Rourke湍流扩散模型与Frossling蒸发模型建立了喷雾蒸发的数值仿真模型,并使用复合激光诱导荧光(LIEF)技术对相同工况下定容弹内喷雾的液气两相浓度进行了同步测量,以对仿真进行验证。验证结果表明,仿真中的液相贯穿距与试验吻合较好,证明了仿真模型的正确性。仿真结果在气相部分出现了较明显的偏差,通过对模型方程进行分析得知,这是由于仿真模型所使用的Frossling单液滴蒸发模型无法考虑多组分与多相流情况的传质与传热,并针对如何提高模型精度给出了修正建议。In order to further explore the air-fuel mixing characteristics inside the engine,a numerical simulation model of spray evaporation was established based on the O Rourke turbulent diffusion model and Frossling evaporation model of Converge software,and laser induced exciplex fluorescence(LIEF)technology was used to measure the liquid-gas two-phase concentration of spray in constant volume bombs under the same working conditions to verify the simulation.The verification results show that the liquid phase penetration in the simulation is in good agreement with the experiment,which proves the correctness of the simulation model.However,the simulation results show obvious deviations in the gas phase.According to the analysis of model equation,the reason is that the used Frossling single droplet evaporation model did not consider the mass transfer and heat transfer of multi-component and multi-phase flow.In the end,the specific recommendation on how to improve the accuracy of model is put forward.

关 键 词：燃油喷雾 数值仿真 复合激光诱导荧光(LIEF) 数学模型 模型修正 

分 类 号：TK413.84[动力工程及工程热物理—动力机械及工程]