The effects of surface topography control using liquid crystal elastomers on bodies in flow

摘要: Surface topography control has use across many applications including delayed separation of flow via selective boundary-layer tripping. Recently, advances with liquid crystal elastomers (LCE) have been leveraged for controlled, repeatable, out-of-plane deformations that could enable these topographical changes. An aligned LCE deforms when heated, associated a loss in order. Circumferential patterns fabricated through the thickness film yield predictable conical deformation can surface topography. This study focuses on experimental investigation behavior control. Initially, samples 1/2” diameter and 50 µm thick were characterized using Digital Image Correlation under uniform positive negative gauge pressures at various temperatures. showed strong dependence boundary conditions, sample dimensions, pattern location relative to applied informing adjustment chemistry produce higher modulus glassy materials. As an initial demonstration ability flow, Then, demonstrate potential control, 3D printed cylinders varying arrangements representative features wind tunnel Particle Velocimetry. Results maximum deflection height 1.5 mm two-row arrangement form asymmetric wake about 73 cylinder reduces drag while generating lift. These results inform subsequent active elements are currently examination.