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荧光油流摩擦力场测量技术可以得到模型表面的全局摩擦力信息。该技术基于传统荧光油流技术发展而来,运用荧光油流技术作为原始数据获取手段,对试验图像运用HS光学流动算法进行图像处理得到模型表面油膜厚度随时间轴的变化量,依据动量定理对油膜厚度变化量进行计算得到当地的相对摩擦力信息实现表面摩擦力的可视化测量。本文运用该技术在低速风洞中对平板模型、75°平板三角翼、平板-翼型角区三维模型的表面摩擦力场分布情况进行测量,得到各模型表面的相对摩擦力分布和摩擦力线,并与平板模型Blasius层流解和三角翼模型经典流场结构进行对比。试验结果表明:在低速环境下该测量技术可以应用于模型表面摩擦力的可视化测量,所得摩擦力分布及表面流动情况基本可靠。
Fluorescent oil flow friction field measurement technique can get the global surface friction information. Based on the traditional fluorescent oil flow technology, the fluorescence oil flow technology was used as the raw data acquisition method. The experimental images were processed by HS optical flow algorithm to get the change of oil film thickness with time axis. According to the momentum theorem The change of oil film thickness is calculated to obtain the relative local friction information to realize the visual measurement of surface friction. In this paper, the surface frictional field distributions of flat model, 75 ° delta wing, flat-wing corner region three-dimensional model are measured in low-speed wind tunnel. The relative friction distribution and friction line of each model surface are obtained , And compared with the flat model Blasius laminar flow and delta wing model classical flow field structure. The experimental results show that the measurement technique can be applied to the visual measurement of the surface friction force at low speed, and the resulting friction distribution and surface flow are basically reliable.