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为了探索缝翼噪声的流体动力学机理,在西北工业大学NF-3低速风洞中用动态压力传感器研究多段翼型在不同条件下绕前缘缝翼流动的非定常性。分析了雷诺数、来流迎角、缝翼和襟翼参数(偏角、缝道宽度和搭接量)对缝翼流动的非定常性影响规律。研究结果表明:缝翼流动非定常性与流动雷诺数、缝翼参数、襟翼参数和来流迎角密切相关,初步揭示了缝道涡的变化趋势和对翼型表面流动的影响以及缝翼噪声产生的原因。该试验研究结果对研究多段翼型噪声产生及抑制方法具有一定的指导意义。
In order to explore the hydrodynamic mechanism of slat noise, a dynamic pressure sensor was used to study the unsteady flow of multi-section airfoil around the slat under different conditions at NF-3 wind tunnel at Northwestern Polytechnic University. The influence of Reynolds number, incoming angle of attack, parameters of slat and flap (declination, slot width and overlap) on unsteady flow of slat is analyzed. The results show that the unsteady flow of slat is closely related to the flow Reynolds number, slat parameters, flap parameters and incoming flow angle of attack. The trends of the slits and their influence on the airfoil flow are revealed. The reason for the noise. The results of this experimental study have certain guiding significance for studying the generation and suppression of multi-section airfoil noise.