Aeroacoustic Optimization of the Bionic Leading Edge of a Typical Blade for Performance Improvement
Aeroacoustic Optimization of the Bionic Leading Edge of a Typical Blade for Performance Improvement
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DOI：
10.3390/machines9080175
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发表时间：
2021-08
期刊：
影响因子：
2.6
通讯作者：
Haoran Liu;Yeming Lu;Jinguang Yang;Xiaofang Wang;Jinjun Ju;Jiangang Tu;Zongyou Yang;Hui Wang;Xide Lai
中科院分区：
文献类型：
--
作者：
Haoran Liu;Yeming Lu;Jinguang Yang;Xiaofang Wang;Jinjun Ju;Jiangang Tu;Zongyou Yang;Hui Wang;Xide Lai
新的，创新的优化方法，以提高发动机性能和降低发动机噪声在工程上具有重要意义。本文基于仿生学的概念，采用波浪形结构对叶片前缘进行造型。以NACA 0018叶片为基本叶片，提出了一种由三个参数控制的联合参数化方法来配置波浪形前缘。在此基础上，提出了一种提高设计效率的优化策略，以输出最优设计结果。最后分析了相应的性能和流动机理。考虑到封闭叶轮轮毂壁和围带壁的存在，增加了近壁调整系数，并论证了其意义。通过优化策略成功地得到了一个最优的仿生叶片，与原叶片相比，其平均阻力系数降低了约6%，总声压级降低了约3 dB。机理分析表明，该波结构可以在前缘诱导展向速度，并进一步延迟下游区域的流动分离，同时降低阻力和噪声。
New, innovative optimization approaches to improve turbomachine performance and reduce turbomachine noise are significant in engineering. In this paper, based on the bionic concept, a wave structure is used to shape the leading edge of the blade. Using an NACA0018 blade as the basic blade, a united parametric approach controlled by three parameters is proposed to configure the wavy leading edge. Then, a new optimization strategy boosting design efficiency is established to output the optimal design results. Finally, the corresponding performance and flow mechanism are analyzed. Taking into account the existence of the hub wall and the shroud wall from the closed impeller, a near-wall adjustment factor is added, the significance of which is herein demonstrated. An optimal bionic blade is successfully obtained by the optimization strategy, which can reduce the mean drag coefficient by about 6% and the overall sound pressure level by about 3 dB, in relative to the original blade. Mechanism analysis revealed that the wave structure can induce spanwise velocity at the leading edge and cause a further delay in flow separation in the downstream region, synchronously reducing drag and noise.