提高柴油机燃烧过程仿真计算精度的标定方法

为提高柴油机燃烧过程仿真计算精度,该文提出了新的仿真模型标定方法：首先对仿真计算的喷雾液相贯穿距、总的喷雾贯穿距（含气相）和喷雾形态进行试验验证;然后基于喷雾过程标定结果,选择合适的燃烧模型,对仿真计算的缸压和放热率曲线进行试验验证。按照上述方法应用Fire软件研究了WAVE破碎模型、Dukowicz蒸发模型和ECFM-3Z燃烧模型相关参数对计算结果的影响,分别利用喷雾自由射流和单缸柴油机试验结果标定了喷雾和燃烧模型,并与仅利用缸压和放热率曲线标定仿真模型的传统方法进行了比较。结果表明：仅利用缸压和放热率曲线标定仿真模型的方法不能保证喷雾过程模拟的准确性,后续燃烧、排放模拟的准确性亦不能保证;...

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Bibliographic Details
Published in农业工程学报 Vol. 33; no. 4; pp. 102 - 110
Main Author 李向荣 陈彦林 赵陆明 刘福水
Format Journal Article
LanguageChinese
Published 北京理工大学机械与车辆学院,北京,100081 2017
Subjects
仿真
喷雾
柴油机
校核验证
模型
燃烧
combustion
spray
柴油机
simulation
模型
diesel engine
燃烧
仿真
model
校核验证
verification and validation
喷雾
Online AccessGet full text
ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2017.04.015

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Summary:为提高柴油机燃烧过程仿真计算精度,该文提出了新的仿真模型标定方法：首先对仿真计算的喷雾液相贯穿距、总的喷雾贯穿距（含气相）和喷雾形态进行试验验证;然后基于喷雾过程标定结果,选择合适的燃烧模型,对仿真计算的缸压和放热率曲线进行试验验证。按照上述方法应用Fire软件研究了WAVE破碎模型、Dukowicz蒸发模型和ECFM-3Z燃烧模型相关参数对计算结果的影响,分别利用喷雾自由射流和单缸柴油机试验结果标定了喷雾和燃烧模型,并与仅利用缸压和放热率曲线标定仿真模型的传统方法进行了比较。结果表明：仅利用缸压和放热率曲线标定仿真模型的方法不能保证喷雾过程模拟的准确性,后续燃烧、排放模拟的准确性亦不能保证;采用新提出的仿真模型标定方法,能准确模拟单次和分段喷射条件下柴油机的缸内喷雾和燃烧过程,拓宽了应用范围,提高了仿真计算精度。
Bibliography:11-2047/S
To improve the computation accuracy of combustion process simulation in diesel engine, a new calibration method of numerical model was proposed in this paper, and the calibration of spray process and combustion process were combined together. For the calibration of spray process, the key parameters of WAVE spray breakup model and Dukowicz evaporation model should be calibrated with experimental results, including spray liquid penetration, spray penetration and spray profile, which were measured in constant volume combustion bomb. Based on the calibration results of spray process, the simulation of combustion process required appropriate combustion model, the key parameters of which were calibrated by the experimental data in a single cylinder diesel engine, including the in-cylinder pressure and heat release rate. To validate the proposed method, a spray mesh and a moving mesh were established in AVL Fire software to calibrate the spray models and combustion model respectively. As with the meshes for
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2017.04.015