高强度紫外灯用于航空动力学研究

近日西华大学在《Aerospace》发表文献《Experimental Investigation of the Effect of Bio-Inspired Wavy Leading-Edges on Aerodynamic Performance and Flow Topologies of the Airfoil》，文献中使用了 LUYOR-3121 大面积辐照紫外灯用于仿生动力学研究。LUYOR-3121 大面积辐照紫外灯内置 21 颗 365nm 大功率紫外 LED，照射面积大，紫外线辐照强度高，先后被国内外多家科研院所用于太阳能、半导体、航空航天等行业的科学研究。

文献摘要如下：

The characteristic of delayed airfoil stalls caused by the bio-inspired Wavy Leading-Edges (WLEs) has attracted extensive attention. This paper investigated the effect of WLEs on the aerodynamic performance and flow topologies of the airfoil through wind tunnel experiments, while also discussing the flow control mechanism of WLEs. The result shows that, at small Angle of Attack (AOA), the flow through the WLEs exhibits periodic and symmetrical characteristics, where flow vortices upwash at the trough and downwash at the crest, resulting in flow from the crest to the trough. Upwash leads to the formation of a localized three-dimensional laminar separation bubble (LSB) structure at the leading edge of the trough section. At large AOA after baseline airfoil stall, the flow on the airfoil surface of WLEs presents a two-period pattern along the spanwise direction, and the separation zone and the attachment zone appear alternately, indicating that the control effect of delayed stall is accomplished by reducing the separation zone on the airfoil surface. The alternating occurrence of the separation and attachment zones is the result of intricate interactions among flows passing through multiple WLEs. This interaction causes the convergence of high-momentum attached airflows on both sides, thereby constraining the spread of the separation from the leading edge and enabling the re-attachment of separated air. The research results of this paper provide a reference for researchers to reveal the flow control mechanism of WLEs more comprehensively.

Figure 7 shows the fluorescent oil film measuring device in the experiment. The fluorescent oil film was made of fluorescent powder with Dow Corning PMX-200 (Dow, Midland, Michigan, USA) silicone oil (viscosity is 100 cs and 350 cs). The UV excitation light source was a LUYOR-3121 UV lamp (LUYOR, Joliet, IL, USA). In this study, the Fastcam AX-100 mini (Photron, Tokyo, Japan) was used as a high-speed camera with a resolution of 1024 × 1024 pixels. The Nikon lens had a focal length range of 14–24 mm. The camera shoots at 50 Hz. Usually, the optical flow algorithm can get a surface optical flow snapshot solution by processing the front and back images. This study averages 50–200 snapshots to obtain a stable and uniform flow topology.

文献地址：https://doi.org/10.3390/aerospace11030194

LUYOR-3121 产品介绍：

吊挂式 LED 紫外线荧光探伤灯 LUYOR-3121

上海路阳仪器有限公司生产销售各种紫外光源，有手持式紫外灯、台式紫外灯、吊挂式紫外灯，有 185nm、254nm、302nm、365nm 和 395nm 等各种波段，能够满足科研院所各种实验要求，公司面对科研院所提供样机免费试用，也能够按照实验需求提供定制服务。