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程怀玉, 季斌, 龙新平, 槐文信. 空化对叶顶间隙泄漏涡演变特性及特征参数影响的大涡模拟研究[J]. 力学学报, 2021, 53(5): 1268-1287. DOI: 10.6052/0459-1879-20-415
引用本文: 程怀玉, 季斌, 龙新平, 槐文信. 空化对叶顶间隙泄漏涡演变特性及特征参数影响的大涡模拟研究[J]. 力学学报, 2021, 53(5): 1268-1287. DOI: 10.6052/0459-1879-20-415
Cheng Huaiyu, Ji Bin, Long Xinping, Huai Wenxin. LES INVESTIGATION ON THE INFLUENCE OF CAVITATION ON THE EVOLUTION AND CHARACTERISTICS OF TIP LEAKAGE VORTEX[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(5): 1268-1287. DOI: 10.6052/0459-1879-20-415
Citation: Cheng Huaiyu, Ji Bin, Long Xinping, Huai Wenxin. LES INVESTIGATION ON THE INFLUENCE OF CAVITATION ON THE EVOLUTION AND CHARACTERISTICS OF TIP LEAKAGE VORTEX[J]. Chinese Journal of Theoretical and Applied Mechanics, 2021, 53(5): 1268-1287. DOI: 10.6052/0459-1879-20-415

空化对叶顶间隙泄漏涡演变特性及特征参数影响的大涡模拟研究

LES INVESTIGATION ON THE INFLUENCE OF CAVITATION ON THE EVOLUTION AND CHARACTERISTICS OF TIP LEAKAGE VORTEX

  • 摘要: 利用大涡模拟方法及一个考虑气核效应的欧拉\!-\!拉格朗日新空化模型, 对绕NACA0009水翼叶顶间隙泄漏涡(top-leakage vortex, TLV)及其空化流动开展了高精度的模拟, 结果显示数值模拟与实验吻合较好. 在此基础上进一步讨论了不同间隙大小对TLV空化的演变行为及其发生前后TLV强度、气核分布以及切向速度分布等特征参数的变化规律, 分析了TLV空化对TLV演变行为及其特征参数的影响机制. 结果表明, 空化发生后, TLV的强度主要受片空化演变行为的影响, TLV空化对其自身强度的影响较小. 此外, 间隙越小, 片空化越不稳定, TLV的强度也会呈现相应的准周期性波动. 随着间隙的逐渐增大, 片空化强度逐渐减小, 其不稳定性也逐步减弱, TLV强度逐渐恢复至无空化时的水平, 其波动也会逐渐减小. 空化对涡心处气核分布会产生较为明显的影响, 其影响程度取决于空化发生后TLV在空间上的稳定性以及TLV空化的强度. 此外, 空化发生后, TLV半径会在一定程度上增大, 且在空化区域外围形成``类刚体旋转''的切向速度分布特性, 其形成原因主要是空化生长引起的膨胀过程以及流动的黏性作用.

     

    Abstract: In the present paper, the tip-leakage vortex (TLV) cavitation around a NACA0009 hydrofoil is numerically investigated with large eddy simulation method combined with a new Euler-Lagrangian cavitation model, which takes into account the effect of nuclei on tip-leakage cavitating flow. A satisfying agreement between the numerical and experimental results is obtained. Based on the numerical data, the evolution behavior of TLV cavitation with different gap sizes and its influence on the strength and radius of TLV, the nuclei distribution in the vortex core and the distribution of tangential velocity are discussed in detail. The results show that once cavitation occurs, the intensity of TLV is mainly affected by the evolution behavior of the sheet cavitation, while the tip-leakage cavitating flow has little effect on the strength of TLV. In addition, the results suggest that a smaller gap size will result in a more unstable sheet cavity, and the strength of TLV in turn presents corresponding quasi-periodic fluctuation as influenced by the evolution of the sheet cavitation. As the tip clearance progressively increases, the strength of the sheet cavitation gradually decreases with the reduction of instability, and the intensity of TLV gradually returns to the level without cavitation, together with its fluctuation level. Cavitation has a more significant influence on the nuclei distribution in the vortex core, and its degree of influence depends on the spatial stability of TLV and the intensity of TLV cavitation after the occurrence of cavitation. Moreover, the numerical results obtained by our simulations also indicate that cavitation has a significant influence on the radius of TLV. After cavitation occurs, the radius of TLV increases to a certain extent, and a ``rigid body rotation'' tangential velocity distribution is formed on the periphery of cavitation region, which is mainly caused by the expansion process induced by cavitation growth and the viscous effect of flow.

     

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