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| 叶片锯齿前缘控制流动分离的数值研究 |
| Numerical study on the flow separation controlling by sawtooth leading edge of the blade |
| 投稿时间：2018-04-11 |
| DOI：10.13259/j.cnki.eri.2021.04.007 |
| 中文关键词: 尾迹涡 压力脉动 锯齿前缘 叠加波形 |
| 英文关键词:wake vortex pressure fluctuation sawtooth leading edge superimposed wave |
| 基金项目:国家自然科学基金资助项目（51106099、50976072）；上海市科委科研计划项目（13DZ2260900） |
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| 中文摘要: |
| 针对锯齿前缘结构调控叶片近壁面流场特性，以NACA0018叶片为对象，采用大涡模拟方法研究不同锯齿前缘结构对叶片近壁面流场的影响机制。获得了来流速度为30 m·s-1、雷诺数为513 440、0°攻角下叶片近壁面流场分布特性。分析了锯齿前缘和叶片前缘和尾缘处压力脉动及分离涡的影响。数值结果表明：对正弦波齿而言，随着振幅的增大，在波谷处的小涡开始向前缘移动，整体上小尺度涡增多，前缘近壁面压力脉动增大，尾缘近壁面压力脉动减小；对叠加波形齿而言，尾迹涡进一步破碎，厚度变薄，叶片表面出现破碎的小尺度涡，在尾缘处叶片压力脉动幅值下降最为明显，且未出现明显的窄带尖峰。 |
| 英文摘要: |
| Aiming at the flow field characteristics of the near-wall blade surface controlled by sawtooth leading edge, taking the NACA0018 blade as the object, the influence of sawtooth leading edge on the near-wall flow field of the blade was studied by large eddy simulation method. The distribution characteristics of flow field near the blade wall at a flow velocity of 30 m·s-1, a Reynolds number of 513 440, and an angle of attack of 0° were obtained. The influence of the sawtooth leading edge on the pressure fluctuation and the separation vortex at the leading and trailing edges of the blade was analyzed. The numerical results show that for the sine-shaped sawtooth, as the amplitude increases, the small-scale vortex at the wave trough moves to the front edge, which increases generally. The pressure fluctuation near the front wall increases while the pressure fluctuation near the wall of the trailing edge decreases. For the superimposed sawtooth, the wake vortex is further broken, whose thickness decreases. And the small-scale broken vortices appear on the blade surface. The pressure fluctuation amplitude at the blade trailing edge decreases obviously, and there is no obvious narrow-band spike. |
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