Numerical simulation of n-dodecane spray based on VLES
周涛涛 1陈江锋 1韩省思 2孟顺 1张郁1
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作者信息
1. 合肥工业大学汽车与交通工程学院,安徽合肥 230009
2. 南京航空航天大学能源与动力学院,江苏南京 210016
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摘要
为了研究超大涡模拟(very large eddy simulation,VLES)方法预测高压喷雾发展过程的能力,文章采用VLES方法耦合离散相模型(discrete phase model,DPM)对桑迪亚国家实验室"Spray A"正十二烷喷雾射流进行数值研究.在与实验结果进行对比的基础上,进一步比较VLES方法与分别采用雷诺时均(Reynolds-averaged Navier-Stokes,RANS)方法和大涡模拟(large eddy simulation,LES)方法得到的预测结果.研究结果表明,VLES方法耦合DPM能够较准确地预测出燃油雾化的发展过程,在贯穿距、局部物理量以及喷雾形态上的预测结果优于RANS方法,且计算量相较于LES方法大大降低.
Abstract
In order to study the ability of very large eddy simulation(VLES)method to predict the de-velopment process of high-pressure spray,the VLES method coupled with discrete phase model(DPM)was used to numerically study the Spray A n-dodecane spray jet at Sandia National Laborato-ries.On the basis of comparison with the experimental results,the VLES results are further com-pared with the prediction results obtained by the Reynolds-averaged Navier-Stokes simulation(RANS)method and large eddy simulation(LES)method respectively.The results show that VLES method coupled with DPM can accurately predict the development process of fuel atomization,and the predic-tion results in penetration,local physical quantities and spray morphology are better than those of RANS method,and the calculation amount is significantly lower than that of LES method.
关键词
超大涡模拟(VLES)/离散相模型(DPM)/雾化/贯穿距
Key words
very large eddy simulation(VLES)/discrete phase model(DPM)/atomization/penetration
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