论文标题
高雷诺数湍流边界层中的速度衍生物。第三部分：用于衍生力矩评估的SPIV实验的优化
Velocity derivatives in a high Reynolds number turbulent boundary layer. Part III: Optimization of an SPIV experiment for derivative moments assessment
论文作者
论文摘要
同时在LML边界层设施中同时进行了使用两个正交平面的SPIV实验，以专门测量估计湍流动能的耗散速率所需的所有衍生矩。雷诺数为$re_θ= 7500 $或$re_τ= 2300 $。对衍生物测量中的误差进行了详细分析，并应用和使用从连续性方程得出的一致性检查。量化了随机噪声误差，并用于``降低''衍生力矩。与可比雷诺数下的DNS通道流量的比较证明了该技术的能力。使用George和Stanislas 2020年开发的最新理论进一步验证了结果。所得数据已在本研究的第I和II部分中广泛使用，用于在墙壁耗散附近进行研究。本工作的重要结果是提供可靠的规则，以准确评估未来的PIV实验中的耗散。
An SPIV experiment using two orthogonal planes simultaneously was performed in the LML boundary layer facility to specifically measure all of the derivative moments needed to estimate the dissipation rate of the Turbulence Kinetic Energy. The Reynolds number was $Re_θ= 7500$ or $Re_τ= 2300$. A detailed analysis of the errors in derivative measurements was carried out, as well as applying and using consistency checks derived from the continuity equation. The random noise error was quantified, and used to ``de-noise'' the derivative moments. A comparison with a DNS channel flow at comparable Reynolds number demonstrated the capability of the technique. The results were further validated using the recent theory developed by George and Stanislas 2020. The resulting data have been extensively used in parts I and II of the present contribution to study near wall dissipation. An important result of the present work is the provision of reliable rules for an accurate assessment of the dissipation in future PIV experiments.
