Modelling of breakup processes in transient Diesel fuel sprays

这一建议是关于发展新的数学模型的瞬态柴油燃料喷气，考虑到他们的不稳定性和加速度，以适合实现到计算流体动力学（CFD）代码的形式。将考虑到对流不稳定性、绝对不稳定性和全局不稳定性之间的区别以及空化对柴油喷雾形成的影响。后一种效应预计将通过改变喷管出口射流的边界条件而出现。利用三维激光测振仪对边界扰动对射流破裂的影响进行了实验研究。预计喷气机的加速度会导致喷气机的部分稳定。射流加速度和射流不稳定性的影响将用于开发一种新的随机模型，该模型适合在CFD代码中实现。该随机模型将在KIVA-2 CFD代码的定制内部版本中实现。这个代码将用于模拟流体动力学，传热和燃烧过程中的柴油发动机。模型的结果将根据内部实验数据进行验证。这将为其他CFD代码（包括商业代码）实现新模型开辟道路。

This proposal is concerned with the development of new mathematical models for transient Diesel fuel jets, taking into account their instabilities and acceleration, in a form suitable for implementation into computational fluid dynamics (CFD) codes. The distinction between convective, absolute and global instabilities and the effects of cavitation on the formation of Diesel fuel sprays will be taken into account. The latter effects are expected to appear via the modification of the boundary conditions for jets at the exit of the nozzle. Effects of boundary disturbances on the breakup of the jet will be studied experiementally using a three dimensional laser vibrometer. The jet acceleration is expected to lead to partial stabilisation of the jet. The effects of jet acceleration and jet instabilities will be used to develop a new stochastic model for the primary spray breakup in a form suitable for implementation into CFD codes. This stochastic model will be implemented into a customised in-house version of the KIVA-2 CFD code. This code will be used for modelling fluid dynamics, heat transfer and combustion processes in Diesel engines. The results of the modelling will be validated against in-house experimental data. This will open the way to implement new models to other CFD codes, including commercial ones.