The active control of laminar and turbulent flows with dynamic actuators is of
great scientific and technological interest in nearly all fields of fluid mechanics.
Today, most of the well established actuator concepts are based on pneumatic and
micro-mechanic bases. However, owing to their limited dynamic range, their potential
seems to be limited from the present point of view [1]. Recently it was successfully
demonstrated that a boundary layer flow can be efficiently controlled by
using an optical actuator concept, which allows non-intrusive excitation of the flow
with nearly any pulse-width and repetition-rate by heating the surface of a model
with a short-focused laser pulse [2]. The drawback of the proposed and examined
method was the gradual ablation of the model surface. To avoid this problem the
excitation was performed above the surface in this investigation [3]. By using the
phased locked stereoscopic PIV and Schlieren technique the dynamic effect of the
laser induced plasma on a boundary layer flow could be examined in detail. In this
contribution the main results will be summarized and the perspective of this actuation
method for fundamental and applied fluid mechanics will be outlined. 德國(guó)LaVision PIV/PLIF粒子成像測(cè)速場(chǎng)儀 時(shí)間分辨粒子成像測(cè)速系統(tǒng)(TR-PIV) Imager sCMOS PIV相機(jī)
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