摘要
以DDES/AA(Delayed Detached Eddy Simulation/Acoustic Analogy)混合方法为手段,探索了波浪前缘静子对风扇宽频噪声模态的影响和物理机制。研究发现:波浪前缘静子叶片可以显著降低风扇宽频噪声,且对高阶宽频噪声模态能量产生了显著的抑制效果。在此研究基础上,推测波浪前缘静子对高阶宽频噪声模态能量的强抑制效果的原因在于噪声能量的散射作用。进一步地,分析了波浪前缘静子调控风扇宽频噪声模态的物理机制,发现波浪前缘静子可以有效改变静子前缘压力脉动的分布形式,加剧了压力脉动的时-空相位延迟程度,并使压力脉动的展向相关性降低。这些现象是引起风扇宽频噪声模态能量散射并有效降低宽频噪声的主要原因。通过对3种波浪前缘静子叶片的压力脉动展向相关性进行分析,发现宽频噪声的模态调控效果和降低效果与压力脉动的展向相关性有关,当压力脉动的展向相关性降低到一定程度后,可能会导致风扇宽频噪声降噪的“振幅阈值”现象出现,进而引起风扇宽频噪声难以进一步降低。
The effects and physical mechanisms of wave leading edge stator on fan broadband noise mode using the hybrid DDES/AA(Delayed Detached Eddy Simulation/Acoustic Analogy)method are investigated.It is found that wave leading edge blades significantly reduce fan broadband noise,particularly exhibiting pronounced suppression effects on high-order broadband noise modal energy.Based on these observations,it is hypothesized that the strong suppression effect of wave leading edge stators on higher-order broadband noise mode energy originates from noise energy scattering effects.Furthermore,the physical mechanisms of fan broadband noise mode control by wave leading edge stators are analyzed.It is found that the primary cause of fan broadband noise mode control by wave leading edge stators is that the wave leading edge stators effectively change the distribution characteristic of pressure fluctuations,intensifying the timespace phase delay of pressure fluctuations,and reduce the span-wise correlation of pressure fluctuations.These phenomena are identified as primary contributors to broadband noise modal scattering and effective broadband noise reduction.Investigation of three wave leading-edge configurations shows that the mode control and noise reduction performance strongly correlate with span-wise pressure fluctuation coherence.When the span-wise pressure fluctuations correlation decreases to a certain extent,it may lead to the occurrence of a“magnitude threshold”phenomenon in fan broadband noise reduction,which subsequently makes it difficult to further reduce the noise level.
作者
同航
韩晟
赵志林
TONG Hang;HAN Sheng;ZHAO Zhilin(Xi’an Aeronautics Computing Technique Research Institute,AVIC,Xi’an Shaanxi 710068,China)
出处
《海军航空大学学报》
2026年第1期147-156,共10页
Journal of Naval Aviation University
基金
国家自然科学基金(52106056)。
关键词
风扇
管道声学
宽频噪声
波浪前缘构型
模态调控
fan
duct acoustics
broadband noise
wave leading edge configuration
mode control
