襟翼表面粗糙度对多段翼型升力的影响  

Influence of Flap Surface Roughness on the Lift of Multi-element Airfoil

作　　者：朱奇亮[1] 高永卫[1] 叶正寅[1] 

机构地区：[1]西北工业大学翼型叶栅空气动力学国防科技重点实验室,西安710072

出　　处：《航空工程进展》2015年第1期93-98,共6页Advances in Aeronautical Science and Engineering

摘　　要：在襟翼上表面填充多孔吸声材料,虽然缝道的噪声有所降低,但翼型升力系数也有较大损失。为了确定是否因多孔材料造成翼面粗糙度增加而降低了升力系数,也为了进一步确定数值模拟中粗糙表面简化模型的适用性,通过风洞试验和数值模拟进行研究。数值模拟采用沿流向三角形凸起模拟吸声材料的粗糙度,采用ANSYS-Fluent的二维模块、非结构网格和k-ωSST湍流模型进行计算。风洞试验在某NF-3低速翼型风洞中完成,采用等弦长的二维测压模型,光滑模型表面是通过在吸声材料上覆盖光滑薄膜实现的。结果表明:可以采用沿流向三角形凸起模拟吸声材料的粗糙度对升力特性的影响;吸声材料的粗糙度影响翼型的升力系数。因此,若通过吸声材料降低缝道流动噪声,需要进一步研究吸声性能好且表面比较光滑的材料/结构。The upper surface of flap is filled with porous sound-absorbing material. The wind tunnel experiment is accomplished in NF-3 low-speed wind tunnel. The result shows that, although the noise of gap is decreased, the airfoil lift coefficient is of a larger loss. In order to determine whether the increased roughness of flap surface by porous material causes the drop of lift coefficient, and determine the applicability of numerical simulated the rough surface with a simplified model, the experiment and numerical simulation research are both applied. The triangular protrusion along the flow direction is used to simulate the roughness of absorption material. The nu- merical simulation is carried on the two-dimensional simulation of ANSYS Fluent with the unstructured mesh and k-ω SST turbulence model; The experiment model is two-dimensional model with the same chord length. The smooth and rough situations are achieved by filling sound-absorbing porous material in upper surface of flap and using plastic membrane to overlap it or not. The result shows that the triangular protrusion can simulate the roughness of absorption material and the roughness of sound-absorbing material indeed affect airfoil lift coeffi- cient. Thus, further research on smooth surface of sound-absorbing material/structure is needed before using the sound-absorbing material to reduce the flow noise in gap.

关 键 词：风洞试验 吸声材料 粗糙度 多段翼型 三角形凸起模型 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程]