结冰对翼型和多段翼型绕流及气动特性影响研究

对翼型结冰问题，在结冰条件下，利用数值方法分析研究翼型和多段翼型绕流流场及气动特性的影响。对于翼型和多段翼型，采用分区多块网格技术，结合法向外推的代数方法和求解椭圆型方程方法，生成高质量计算网格。采用中心有限体积法，以及Runge-Kutta显式时间推进格式，结合B—L代数湍流模型，运用流场分区求解算法，完成了绕流流场的N-S方程数值模拟，进一步针对3种不同的冰型：钝头体、双角体和尖头体冰型，分析不同形状的冰型对翼型和多段翼型绕流流场及气动特性的影响。

Icing Research on Airfoil and Multi-Element Airfoil Based on Flow Field and Aerodynamic Performance

Ice accretions over critical aerodynamics surface cause significant degradation in aircraft performance and handling qualities.Numerical simulations using the N-S equations are presented to investigate the effect of different ice shapes on the aerodynamic performance of airfoil and multi-element airfoil.In the icing research,we construct three different ice shapes: sharp-angled ice,blunt nosed ice and double horn ice.Using these icing models,we calculate and analyze the flow field and aerodynamic characteristics of a wing airfoil and a four-element airfoil.Solving the elliptic equations together with an algebraic method marching along the normal-to-wall direction,we generate computational grids.For the multi-element airfoil,we use a multi-block grid technique.We solve N-S equations with a conventional algorithm,which includes the cell-centred finite volume method and the Runge-Kutta time-stepping scheme.We complete the solution of N-S equations by introducing the Baldwin-Lomax algebraic turbulence model that can predict the attached and little-separation flows.The calculated results are in good agreement with experimental data and show preliminarily that our method of icing research is feasible.