对超音速射流流场发展的影响的评估
Assessment of jet inflow conditions on the development of supersonic jet flows
AI总结：
本文通过大涡模拟研究了超音速射流中流入条件对流场发展的影响，发现稳态粘性流入在射流入口附近表现最显著，同时提供了高保真的数据库供科学界使用。
摘要：
本文通过大涡模拟研究了自由超音速射流流场中流入条件的影响。采用高阶节点不连续伽辽金方法求解控制方程，生成网格上进行计算。评估了三种不同的流入剖面，即无粘、稳态粘性及非稳态粘性剖面。从模拟中获得的速度和剪应力张量分量剖面与实验数据进行比较。在研究的剖面中，稳态粘性流入与无粘情况相比在射流入口附近有显著偏差。稳态粘性剖面也导致了峰值速度波动减少，表现出更好的实验一致性。进一步下游，流入条件的影响减小，所有三种剖面都向实验参考值收敛。此外，对流体速度波动的功率谱密度分析显示，流入条件对谱分布影响不大，数值结果在可访问的斯特劳哈尔范围内与实验数据保持一致。此外，该研究提供了一个高度详细、高保真度的超音速射流流体模拟数据库，包括六次不同网格、多项式细化和流入条件的大涡计算。该数据库包含相关射流流场区域的高频数据，并在Zenodo存储库中公开，确保科学界可以访问和重用。
英文摘要：
In the present work, large-eddy simulations of free supersonic jet flows are performed to investigate the influence of inflow conditions on the jet flow field and its turbulent properties. A high-order nodal discontinuous Galerkin method is employed to solve the governing equations on the generated mesh. Three different inflow profiles are evaluated to represent the nozzle-exit conditions, namely, inviscid, steady viscous, and unsteady viscous profiles. Velocity and shear stress tensor component profiles obtained from the simulations are compared with experimental data. Among the investigated profiles, the steady viscous inflow shows the most significant deviation from the inviscid case, particularly in the near-field region of the jet inlet. The steady viscous profile also leads to reduced peak velocity fluctuations, showing better agreement with experimental results. Further downstream, the influence of the inflow condition diminishes, with all three profiles converging toward the experimental reference. In addition, power spectral density analyses of streamwise velocity fluctuations reveal that the inflow conditions have little effect on spectral distributions, with numerical results showing consistent agreement with experimental data within the accessible Strouhal range. Beyond these findings, the study provides a highly detailed, high-fidelity database of supersonic jet flow simulations, encompassing six large-eddy computations with different meshes, polynomial refinements, and inflow conditions. The database includes high-frequency data in relevant regions of the jet flow field and is openly available in the Zenodo repository, ensuring accessibility and reusability for the scientific community.
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