Effects of relative thickness on aerodynamic characteristics of airfoil at a low Reynolds number
Effects of relative thickness on aerodynamic characteristics of airfoil at a low Reynolds number
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DOI：
10.1016/j.cja.2015.05.012
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发表时间：
2015-08-01
影响因子：
5.7
通讯作者：
Li Guanxiong
中科院分区：
文献类型：
--
作者：
Ma Dongli;Zhao Yanping;Li Guanxiong
研究了高空无人机低速巡航时翼型的低雷诺数绕流特性。对几种典型翼型的低雷诺数绕流进行了数值模拟。水洞模型试验进一步验证了数值方法的准确性和有效性。然后利用上述数值方法，通过对不同相对厚度翼型绕流的数值模拟，探讨了翼型相对厚度对翼型气动性能的影响（12%，14%，16%，18%），以及最大相对厚度的不同位置（x/c = 22%，26%，30%，34%），低雷诺数为5 x 10（5）。结果表明，在低雷诺数下，层流分离泡是影响翼型性能的主要因素。在保证良好失速特性的前提下，最大相对厚度值应尽可能小，且最大相对厚度位置应靠近后缘，以获得良好的翼型性能。该数值方法对低雷诺数流动的模拟是可行的。研究结果可为低雷诺数翼型的设计提供依据。(C)2015作者
This study focuses on the characteristics of low Reynolds number flow around airfoil of high-altitude unmanned aerial vehicles (HAUAVs) cruising at low speed. Numerical simulation on the flows around several representative airfoils is carried out to investigate the low Reynolds number flow. The water tunnel model tests further validate the accuracy and effectiveness of the numerical method. Then the effects of the relative thickness of airfoil on aerodynamic performance are explored, using the above numerical method, by simulating flows around airfoils of different relative thicknesses (12%, 14%, 16%, 18%), as well as different locations of the maximum relative thickness (x/c = 22%, 26%, 30%, 34%), at a low Reynolds number of 5 x 10(5). Results show that performance of airfoils at low Reynolds number is mainly affected by the laminar separation bubble. On the premise of good stall characteristics, the value of maximum relative thickness should be as small as possible, and the location of the maximum relative thickness ought to be closer to the trailing edge to obtain fine airfoil performance. The numerical method is feasible for the simulation of low Reynolds number flow. The study can help to provide a basis for the design of low Reynolds number airfoil. (C) 2015 The Authors.