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相关概念视频

Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...

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Determining 3D Flow Fields via Multi-camera Light Field Imaging
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聚焦激光差异干涉测量对于具有圆形对称性的流场的后处理方法.

Giannino Ponchio Camillo, Alexander Wagner

    The Review of scientific instruments
    |December 11, 2023
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    概括

    本研究介绍了一种方法,利用聚焦激光差异干扰测量 (FLDI) 来重建爆炸波压力. 在FLDI中最小化差异化距离可以提高流场压力波形重建的准确性.

    科学领域:

    • 流体动力学 流体动力学
    • 光学诊断仪器的使用.
    • 波浪的传播方式

    背景情况:

    • 在流域中精确测量短暂的压力波形对于理解诸如冲击波之类的现象至关重要.
    • 聚焦激光差异干扰计 (FLDI) 提供了一种非侵入性的流场分析方法.
    • 从FLDI相位转移数据中重建压力波形需要强大的分析方法.

    研究的目的:

    • 利用FLDI开发和验证一种分析方法,用于在循环对称流场中重建压力波形.
    • 调查FLDI焦距距离对压力波形重建的准确性的影响.
    • 将实验FLDI数据与理论N波相关性和计算流体动力学 (CFD) 模拟进行比较.

    主要方法:

    • 利用聚焦激光差异干扰仪 (FLDI) 来检测火花产生的冲击波中的相位变化.
    • 采用了76,120,175和252微米的不同焦距距离 (Δx).
    • 对表面压力传感器测量和理论N波模型进行验证的重建压力数据.
    • 执行计算FLDI模拟,以仔细检查重建假设.

    主要成果:

    • 重建的压力波形与较小的FLDI分离距离的参考测量有很好的一致性.
    • 与理论N波相关性进行比较,证实了该方法的有效性,在较大的Δx.小差异.

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  • 计算FLDI显示在中间的Δx有差异,但在最小的Δx有很好的一致性.
  • 最佳FLDI Δx被确定为 ≤20%的特征流场长度.

    • 结论:

    • 使用FLDI重建压力波形的拟议分析方法得到了验证.
    • 尽量减少FLDI分化距离 (Δx) 对于获得准确的结果至关重要.
    • 该研究为选择合适的FLDI参数进行流场分析提供了指导方针.