亚跨音速栅格的升阻特性数值研究

栅格几何参数对栅格翼的气动力特性影响很大,针对此问题,采用数值模拟方法研究了亚跨音速条件下栅格形状、翼弦格宽比对栅格升阻特性的影响.栅格形状主要为正置与斜置45°正方形、正六边形、正三角形等4种,翼弦格宽比变化范围为0.7～3.0.结果表明, 形状和翼弦格宽比对栅格阻力系数、升力系数、升阻比都有显著影响,存在使气动力特性最佳的形状和翼弦格宽比,为研究亚跨音速下栅格翼的气动特性提供了基础.

Numerical Simulation About Lift and Drag Characteristics of Grid at Subsonic/Transonic Speeds

The geometry parameters of grid influence aerodynamics characteristics of grid fin greatly. Aiming at this problem, the effects of different shapes and the ratio of chord to width on lift and drag characteristics of grid under the conditions of subsonic/transonic flow was numerically simulated. The shapes of grid include upright square,45-degree skew square, upright hexagon and upright triangle.The ratio of chord to width is in the range of 0.7 to 3.0. The results indicate that the shape and the ratio of chord to width greatly affects coefficient of drag, coefficient of lift and the ratio of lift to drag. There is the shape and ratio of chord to width corresponding with the optimal aerodynamic characteristics. The result offers foundation for the investigation of grid fin at subsonic and transonic speeds.