【摘要】 本文发展了适用于湍流火焰合成纳米颗粒过程模拟的LES-单分散模型。其中，开发了非线性大涡模拟–部分搅拌反应器（NLES-PaSR）模型，对湍流火焰燃烧场进行模拟。此外，建立LES框架下的单分散颗粒输运方程，实现湍流火焰中纳米颗粒时空演变的准确预测。本文成功将该模型应用到湍流扩散火焰燃烧器中异丙醇钛（TTIP）合成TiO₂纳米颗粒的模拟与验证过程。结果表明，该模型能够以较小的计算成本实现对湍流火焰合成纳米颗粒复杂过程的精准预测。此外，氧气流量的增加能够明显减小颗粒产物的粒径，而前驱体流量的增加会使得产物颗粒粒径增加，同时会使得颗粒形态由球形颗粒组成的软团聚体向枝簇状结构的硬团聚体转变。更多还原

【Abstract】 In the present work, a new simulation approach coupling large-eddy simulation（LES）and monodisperse model for nanoparticle synthesis in turbulent flame is proposed. In particular,the nonlinear LES-partially stirred reactor model（NLES-PaSR） is utilized to simulate the turbulent flame. In addition, the monodisperse particle transport equations are successfully established in the LES framework to describe the spatiotemporally resolved formation and growth of nanoparticles in turbulent flame. The developed LES-monodisperse model successfully simulates the synthesis of TiO₂nanoparticles via TTIP in a turbulent diffusion flame burner. The results show that the proposed model is able to provide precise predictions of the complex processes involved in turbulent flame synthesis of nanoparticles at a relatively low computational cost. Furthermore, the increase of oxygen flow rate can significantly reduce the particle size, and an increase in precursor flow rate leads to an increase in particle size and a transition from soft agglomerates composed of round-shaped primary particles to branched structures with hard sintering necks/bonds.更多还原