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太阳能飞机的相对速度较低,高空飞行可能面临低雷诺数带来的气动问题。采用经典的面元法二维程序,对典型的FX低速翼型进行了不同雷诺数的计算评估,分析了气动力系数、转捩点等随雷诺数的变化特点。将二维拓展至三维情形,采用RANS求解器,对某太阳能飞机的几个典型高度工况进行了全机气动特性的计算分析,证实二维翼型的雷诺数影响规律对于三维全机仍然是适用的。当雷诺数显著降低时,气动特性通常也会有一定程度的恶化,在太阳能飞机的初步设计阶段就应该对雷诺数的影响进行充分的分析评估。
Relative low speed solar powered aircraft, high-altitude flight may face low aerodynamic problems caused by the number of Renault. Based on the classical two-dimensional surface area method, the calculation and evaluation of different Reynolds numbers of typical low-speed aerofoils are carried out. The variation characteristics of aerodynamic coefficient, turning point and so on with Reynolds number are analyzed. The two-dimensional expansion to three-dimensional case, the use of RANS solver, a typical solar aircraft operating conditions for a full height of the aerodynamic characteristics of the calculation and analysis confirmed that the two-dimensional airfoil Reynolds number of laws for the three-dimensional machine is still Applicable. When the Reynolds number is significantly reduced, the aerodynamic characteristics usually deteriorate to a certain extent. Therefore, the influence of the Reynolds number on the preliminary design stage of the solar aircraft should be sufficiently analyzed and evaluated.