Dynamic stall control optimization of rotor airfoil via variable droop leading-edge
Dynamic stall control optimization of rotor airfoil via variable droop leading-edge
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DOI：
10.1016/j.ast.2015.03.022
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发表时间：
2015-06-01
影响因子：
5.6
通讯作者：
Qi-jun, Zhao
中科院分区：
文献类型：
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作者：
Guo-qing, Zhao;Qi-jun, Zhao
基于该优化方法，提出了一种基于可变下垂前缘的旋翼翼型动态失速控制新策略。以带VDLE的振动旋翼翼型为基础，通过求解泊松方程重新生成贴体网格，并基于非定常雷诺平均N-S方程对翼型绕流场进行了数值模拟。为提高计算精度和效率，采用ROE-MUSCL格式、S-A湍流模型和隐式LU-SGS格式。VR-12翼型的验证结果表明，VDLE控制可以显著抑制动态失速涡。此外，翼型动态失速控制的参数分析表明，当VDLE的无量纲频率(k*)约为1.0，且VDLE的平均下垂角(δ(0))和角幅(Delta(M))在2度到7度之间时，可以显著改善振动翼型的气动特性。此外，还利用代理模型进行了多目标优化。通过控制k*=1.06和Delta(M)(Delta(0))=8.46度的VDLE，可以使VR-12翼型的最大阻力系数和负力矩系数分别降低79.2%和81.2%。通过多目标优化表明，某一时刻的“向上”前沿有助于优化VDLE对旋翼翼型动态失速的控制效果。(C)2015年爱思唯尔·马森公司。版权所有。
A novel strategy of dynamic stall control for rotor airfoil via variable droop leading-edge (VDLE) has been conducted based upon the optimization method. As foundations, body-fitted grids around oscillatory rotor airfoil with VDLE are regenerated by solving Poisson equations, and flowfield around airfoil is simulated based on unsteady Reynold averaged Navier-Stokes (URANS) equations. To improve computational accuracy and efficiency, ROE-MUSCL scheme, S-A turbulence model and implicit LU-SGS scheme are adopted. The verified results of VR-12 airfoil indicate that dynamic stall vortex could be remarkably suppressed by VDLE control. Additionally, parametric analyses for dynamic stall control of airfoil indicate that aerodynamic characteristics of an oscillatory airfoil could be significantly improved when non-dimensional frequency (k*) of VDLE is about 1.0 and mean droop angle (delta(0)) and angular amplitude (delta(m)) of VDLE are between 2 degrees and 7 degrees. Furthermore, multi-objective optimizations are conducted by employing the surrogate model. The maximum drag and negative moment coefficients of VR-12 airfoil can be reduced by about 79.2% and 81.2% respectively via control of VDLE with k* = 1.06 and delta(m)(delta(0)) = 8.46 degrees. By multi-objective optimization, it indicates that "upward" leading-edge at some instant helps to optimize control effects of VDLE on dynamic stall of rotor airfoil. (C) 2015 Elsevier Masson SAS. All rights reserved.