Neuhaus Lars, Hölling Michael, Bos Wouter J T, Peinke Joachim
Institute of Physics and ForWind, University of Oldenburg, 26129 Oldenburg, Germany.
LMFA, CNRS, Ecole Centrale de Lyon, Université de Lyon, 69134 Ecully, France.
Phys Rev Lett. 2020 Oct 9;125(15):154503. doi: 10.1103/PhysRevLett.125.154503.
Generating laboratory flows resembling atmospheric turbulence is of prime importance to study the effect of wind fluctuations on objects such as buildings, vehicles, or wind turbines. A novel driving of an active grid following a stochastic process is used to generate velocity fluctuations with correlation lengths, and, thus, integral scales, much larger than the transverse dimension of the wind tunnel. The combined action of the active grid and a modulation of the fan speed allows one to generate a flow characterized by a four-decade inertial range and an integral scale Reynolds number of 2×10^{7}.
生成类似于大气湍流的实验室气流对于研究风波动对建筑物、车辆或风力涡轮机等物体的影响至关重要。一种遵循随机过程的新型主动格栅驱动方式被用于生成具有相关长度的速度波动，从而生成比风洞横向尺寸大得多的积分尺度。主动格栅与风扇速度调制的联合作用使得能够生成一种具有四个数量级惯性范围且积分尺度雷诺数为2×10^7的气流。
