摘要
采用数值模拟的方法研究单向翼地面效应。通过有限体积法对质量加权平均N-S方程进行离散求解,湍流模型采用可实现化k-ε模型,运用滑移地面边界条件模拟单向翼与地面的相对运动,模拟介质采用可压缩性空气。运用小尺寸网格及局部高网格密度捕捉单向翼与地面之间的流动细节。通过细化网格来观察单向翼边界层流动,分析单向翼边界层的分离对流场及气动特性的影响。计算结果表明:在地面存在的情况下,机翼下表面与地面之间由于"气阻"作用导致机翼后缘压力梯度增加,并使得机翼后缘边界层分离提前;机翼在攻角为5°左右时升阻比达到最大值。
Based on the numerical simulation method,the ground effect of uniderectional-wing was studied. The mass weighted average N-S equation was solved by the finite volume method,and the turbulence model used the realizable k-ε model,and the relative movement between the uniderectional-wing and the ground was simulated by the sliding boundary conditions and the simulated medium was compressed air. Using the small size grid and the local high density grid,we captured the flow details between uniderection-wing with the ground. The flow in the boundary layer of the wing was ob-served by the refined mesh. The influence of boundary layer separation on the flow field and aerodynamic characteristics of uniderectional-wing was analyzed. The results show that the pressure gradient increases with the increase of the pressure gradient between the wing and the ground,which increases the boundary layer abruption tendency with presence of the surface. And the lift-to-drag ratio of wing reaches its maximum at about 5° angle of attack.
出处
《重庆理工大学学报（自然科学）》
CAS
2016年第2期1-5,共5页
Journal of Chongqing University of Technology：Natural Science
基金
国家自然科学基金资助项目(51305477)
关键词
单向翼
边界层
地面效应
气动特性
uniderectional-wing
boundary layer
ground effect
aerodynamic characteristic
