论文标题
使用CFD方法评估振荡连接中空气动力学特征
Evaluation of Aerodynamic Characteristics in Oscillatory Coning Using CFD Methods
论文作者
论文摘要
风隧道旋转电池平衡测试被广泛用于飞机动力学中，以表征在失速和旋转方案期间中等和高的攻击角度的空气动力学。在这样的实验中，飞机测试模型沿风孔自由流速度向量旋转，允许在稳定的旋转流动条件下以恒定的攻击角度和侧滑角度测量空气动力学特性。在称为振荡固定的修改测试中，旋转矢量是从自由流速度向量倾斜的，从而使流量条件与攻击角度和侧滑角度周期性变化。这允许评估叠加在稳定的圆锥旋转上的不稳定空气动力学反应。使用CFD方法预测旋转电池和振荡性孔子条件中空气动力学特性，可以通过除去较高的雷诺数量的数据来显着补充实验数据，消除支持系统中的干扰效应，提取不稳定的空气动力学衍生物，影响飞机动态稳定性。本文介绍了NASA共同研究模型（CRM）以旋转率和振荡性固定动作获得的CFD仿真结果，其机翼与中等$ re = 1 \ times10^6 $，低马赫数$ m \ mbox {=} 0.2 $，以及使用无稳定的响应中的无稳定响应模型。
The wind tunnel rotary-balance testing is widely used in aircraft dynamics to characterise aerodynamics at moderate and high angles of attack during stall and spin regimes. In such experiments an aircraft test model is rotated along the wind-tunnel free-stream velocity vector allowing the measurement of aerodynamic characteristics in steady rotational flow conditions with constant angle of attack and sideslip. In modified tests named as oscillatory coning, the rotation vector is tilted from the free-stream velocity vector making flow conditions with periodic variations in angle of attack and sideslip. This allows evaluation of unsteady aerodynamic responses superimposed on steady conical rotation. The use of CFD methods for prediction of aerodynamic characteristics in rotary-balance and oscillatory coning conditions may significantly complement experimental data via extrapolation of data for higher Reynolds numbers, elimination of interference effects from supporting system, extraction of unsteady aerodynamic derivatives affecting aircraft dynamic stability. This paper presents CFD simulation results obtained in rotary-balance and oscillatory coning motions for the NASA Common Research Model (CRM) in its wing-body configuration at moderate $Re=1\times10^6$, low Mach number $M\mbox{=}0.2$ and the use of the obtained unsteady responses in aerodynamic modelling.
