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用基于SA湍流模型的DES计算方法对30P-30N多段翼型绕流的非定常性进行数值模拟。通过将非定常计算的气动特性平均值和定常实验结果比较验证了计算方法的可靠性,并对基于SA湍流模型的DES方法非定常数值模拟的结果进行分析。结果表明,所述方法正确地模拟了多段翼型流动的非定常性。缝翼下表面具有一定的涡量变化,而襟翼上表面后缘有明显的周期性的涡脱落。初步揭示了多段翼型噪声辐射的根本原因。研究结果对减小多段翼型噪声的方法研究具有一定的意义。
The unsteady flow around the 30P-30N multi-section airfoil is numerically simulated with the DES calculation method based on the SA turbulence model. The reliability of the calculation method is verified by comparing the unsteady calculated aerodynamic characteristics with the steady-state experimental results, and the results of the unsteady numerical simulation of the DES method based on the SA turbulence model are analyzed. The results show that the proposed method correctly simulates the unsteady flow of multi-section airfoil. The lower surface of the slat has a certain vorticity variation, while the trailing edge of the flapper has obvious periodic vortex shedding. The root cause of multi-section airfoil noise radiation is initially revealed. The research results have certain significance for the study of reducing the noise of multi-section airfoils.