建立了串列叶片模型,基于大涡模拟(large eddy simulation,LES)耦合FfowcsWilliams and Hawkings (FW-H)方程对其气动及声学特性进行了研究,并对叶片间距变化带来的噪声响应展开了分析.结果表明:①亚声速中等雷诺数(Ma=0:21,Re=7×105)下的串列叶片,其噪声主要来源于下游叶片且表现为宽频特性;②受叶尖下洗和叶根上洗流的影响,串列叶片相互作用产生的噪声源主要汇聚于叶片中段;③随着叶片间距增大,上游叶片尾迹发展更充分且与下游叶片作用时间间隔增大,导致串列叶片总声压级(sound pressure level,SPL)增大,声能量向低频转移.
To explore the aerodynamic and aeroacoustic performance of a newly designed tandem blade configuration, numerical simulations were conducted using large eddy simulation (LES) combined with the Ffowcs-Williams and Hawkings (FW-H) integral. The performance responsed to the change of blade spacing was also discussed. The results showed that under subsonic and moderate Reynolds number conditions (Ma = 0.21, Re = 7×105), the noise generated by tandem blades mainly originated from the aft blade and it carried a broadband characteristic. Influenced by the downwash and upwash flows from the blade tip and root, the noise generated by tandem blades tended to be concentrated near the blade mid-span. As the blade spacing increased, the wake behind the fore blade became stronger as a result of enhanced energy accumulation, and the time delayed between the upstream and downstream blades became longer. This led to an increase in the total sound pressure level (SPL) and a shift of the acoustic energy toward lower frequencies.
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