Abstract This paper examines the fluid dynamics of a pilot–scale high–pressure homogeniser using large–eddy simulation. The mixer consists of a non–planar elliptic jet released into a confined cylindrical chamber. The simulated results are validated by comparing mean quantities with published experimental data. The evolution of the shear layers in the jet near–field shows a localised region of high turbulent energy dissipation rate in the major plane, whereas in the minor plane the dissipation rate is of smaller magnitude and spreads over a wider region. The validity of the turbulence isotropy assumption, typically made in dispersed–phase modelling, is examined. Energy spectra exhibit an amplification close to the nozzle at frequencies associated with vortex shedding. Kolmogorovs classical 2/3 scaling in the second–order structure functions is found to be overshadowed by vortex shedding, resulting in steeper slopes in the jet near–field, where the rate of energy dissipation assumes the largest value in the mixer.

中文翻译：

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Sonolator 高压均质器中的大涡模拟

摘要 本文使用大涡模拟研究了中试高压均质器的流体动力学。混合器由一个非平面椭圆形射流释放到一个密闭的圆柱形腔室中。通过将平均数量与已发布的实验数据进行比较来验证模拟结果。射流近场中剪切层的演变表明，在主平面上有一个局部的湍流能量耗散率高的区域，而在次平面上，耗散率的幅度较小，并且分布在更广的区域。检查了湍流各向同性假设的有效性，通常在分散相建模中进行。在与涡旋脱落相关的频率下，能谱在喷嘴附近表现出放大。