车载气动实验系统对机翼气动特性影响数值模拟

为了研究了机翼安装位置对翼型气动特性的影响,建立了一个基于N-S方程的机翼气动特性数值模拟方法,机翼模型剖面为NACA0012,展弦比4。首先通过计算结果与标准模型实验结果对比,验证了三维网格和计算方法的可靠性与适用性,进一步针对车载系统的关键设计参数开展了数值分析。结果表明：车顶流场相较于风洞流场,流场中的速度矢量不完全平行于前进方向,使得不同翼型安装位置处的气动力差别较大；鉴于近车顶效应对模型气动特性有较大影响,对车载试验测量结果带来不可忽视的误差,有必要采用控制实验位置的预处理手段对其进行消除或减弱。

Numerical Simulation of Car-carried Experimental System Effect on Aerodynamic Characteristics of Wing

In order to study the influence of the installation position of the wing on the aerodynamic characteristics of the airfoil, a numerical simulation method of the aerodynamic characteristics of the wing based on the N-S equation was established. The profile of the wing model was NACA0012 and the aspect ratio was 4. Firstly, the reliability and applicability of the 3D mesh and calculation method were verified by comparing the calculation results with the experimental results of the standard model. The numerical analysis of the key design parameters of the car-carried system is carried out. The results show that the velocity vector in the flow field is not completely parallel to the forward direction compared to the wind tunnel flow field, which makes the aerodynamic difference at different airfoil installation locations larger. In view of the fact that the near-vehicle effect has a great influence on the aerodynamic characteristics of the model, and the deviation of car-carried test measurement results can not be ignored, it is necessary to eliminate or weaken the pre-measurement method of controlling the experimental position.