基于 VLES 的正十二烷喷雾数值模拟研究

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。

In order to study the ability of very large eddy simulation (VLES) method to predict the development 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 Laboratories. On the basis of comparison with the experimental results, the VLES results are further compared 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 prediction 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.