Propulsive Efficiency of a Moving Airfoil at Transitional Low Reynolds Numbers
Propulsive Efficiency of a Moving Airfoil at Transitional Low Reynolds Numbers
复制标题
过渡低雷诺数下运动翼型的推进效率
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
R. Radespiel
中科院分区：
文献类型：
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作者：
Jan Windte;R. Radespiel
提出了经过 SD7003 翼型的低雷诺数流的非定常雷诺平均纳维斯托克斯模拟，该翼型在 Re=60, 000 处具有组合的俯仰和俯仰运动，其中跨层流分离气泡发生过渡。数值模拟方法包括基于应用于非稳态平均流量数据的线性稳定性分析的转变预测。对 k = 0.25、0.5 和 1.0 三个降低频率进行参数研究。通过与使用非粘性非定常翼型理论的结果进行比较来量化所遇到的阻力损失。在所研究的推力范围内获得了高推进效率，约为稳定流入翼型阻力的 10 倍。
Unsteady Reynolds-averaged Navier-Stokes simulations of the low-Reynolds-number flow past an SD7003 airfoil with combined plunge and pitch motion at Re=60, 000 are presented in which transition takes place across laminar separation bubbles. The numerical simulation approach includes transition prediction that is based on linear stability analysis applied to unsteady mean flow data. A parameter study for three reduced frequencies of k = 0.25, 0.5, and 1.0 is conducted. The drag losses encountered are quantified by a comparison with results using inviscid unsteady airfoil theory. High propulsive efficiencies are gained within the investigated thrust range, which goes to about 10 times the steady onflow airfoil drag.