摘要
研究了二维翼型在移动地面和固定地面条件下的地面效应及流动特性问题。流场求解采用雷诺平均N-S方程,湍流模型采用k-ω和SST模型。对NACA0015对称翼型在离地速度为1 m/s情况下的非定常绕流进行了计算,选取移动地面条件下不同高度的定常解与非定常计算结果进行了比较。结果表明,考虑非定常效应时升力和阻力的变化明显小于定常解的结果,相对而言力矩的差别较小,固定地面条件下的升力系数和阻力系数略大于移动地面条件下的计算结果。
The purpose of this paper is to clarify the two-dimension airfoil ground effect and it flows characteristics due to different ground boundary conditions, i. e. , moving and fixed bottom boundaries. Turbulent flows around two-dimension wing in ground effect are analyzed with incompressible RANS equations. The k-ω and SST tur- bulent models are in use to simulate high Reynolds flows. Data for NACA0015 section are calculated in two bottom conditions with the velocity of 1 m/s leaving the ground. To compare the unsteady flow effect, steady flow simulation for various ground clearances with moving bottom boundary was also made. According to the computational result, the lift and drag in unsteady flow condition is smaller than that of steady result, but the moment simulated by two bottom conditions is negligible, the lift and drag force simulation by the moving bottom is to some extent smaller than that by the fixed one.
出处
《飞行力学》
CSCD
北大核心
2009年第1期77-80,共4页
Flight Dynamics
关键词
地面效应
非定常效应
湍流模型
ground effect
unsteady effect
turbulent model
