中文摘要：

应用基于k-ωSST湍流模型的IDDES（Improved Delayed Detached Eddy Simulation）方法,就失速点附近翼型前缘典型双角状积冰导致的复杂分离流动进行了数值模拟研究。通过与风洞试验结果进行对比,表明对于此类分离流动问题,IDDES方法能够在壁面附近取得良好的速度预测结果,有效解析分离区域内的中小尺度湍流结构,较为准确地描述大尺度时均分离泡的再附位置和形态特征,适用于翼型结冰后复杂流动的精细分析。同时计算结果显示当此带冰翼型位于失速点附近时,角状冰后方脱落剪切层内部的旋涡不稳定析出和输运过程促进了外部流动与回流区域流动间的掺混,将导致流动发生非定常再附现象。

英文摘要：

Thc accuratc prcdiction of complex flow phenomena leading by icc accreting ofairfoils demands thc improvement of turbulent flow prediction methods. Thc improvcddelayeddetached eddy simulation （IDDES） based on the SST turbulent model is applied in the study ofnumerical simulation about complex stall separation flow cased by a typical dual horn ice on theleading edge. Comparing with the experimental measurements, numerical simulation resultsshow that IDDES can achieve good prediction results near the w all, effectively resolve middle andsmall scale vortex structures in the flow separation area and more accurately describe thereattachment position and shape characteristics of the large scale time-averaged separation bubblefor such separation flow problem. It is demonstrated that the method is suitable for the analysisof the complex flow after the airfoil icing. At the same time, the calculation results show thatwhen the iced airfoil is near the stall point, the unstable vortex separation and transport processof the shear layer behind the horn ice promote the mixing between the external and reversing flowregions. This effect leads the unsteady reattachment phenomenon of separated flow.