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航空学报  2013 

翼型加装格尼襟翼的高亚声速气动特性研究

DOI: 10.7527/S1000-6893.2013.0169, PP. 2277-2286

Keywords: 格尼襟翼,数值计算,激波,气动特性,升阻比

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Abstract:

为研究高亚声速下格尼襟翼(GF)对翼型气动性能的影响,采用数值计算方法研究了NACA8-H-12翼型加装不同高度格尼襟翼后的气动特性。数值计算以雷诺平均Navier-Stokes(RANS)方程作为控制方程,采用有限体积法进行离散,通量计算采用Roe通量差分分裂格式,湍流模型为剪切应力输运(SST)k-ω两方程模型。格尼襟翼高度分别为1%、2%和5%弦长高度,垂直于翼型弦线安装,安装位置分别位于后缘和距后缘5%弦长处。计算结果表明在马赫数Ma=0.8时,格尼襟翼后方形成了双涡结构,该结构对翼型绕流的加速作用增大了翼型的环量,从而使翼型升力系数显著增大;小迎角下襟翼对上表面激波位置的后移作用也有利于翼型增升。关于不同襟翼安装位置的研究表明,襟翼安装于后缘能够带来更大的升阻比增量。在0°~12°迎角范围内,1%、2%和5%弦长高度的格尼襟翼均能够提高翼型在相同升力系数下的升阻比,但较高的格尼襟翼使翼型力矩系数显著增大,因此对于实际工程应用,需选择适当的襟翼高度以避免由于翼型低头力矩过大造成不利影响。

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