【摘要】 阐述了在环形扩压叶栅内利用非定常激励减少分离区损失的实验研究成果。在测得各个工况下环形叶栅的分离旋涡频谱特性的基础上,采用施加声激励的实验手段,系统研究了扩压环形叶栅内流动与非定常扰动之间相互作用的机理,证实了一定条件下的非定常扰动能促使叶栅分离区的减小,从而降低总压损失,达到提高气动性能的目的。分别从激励频率和强度的角度出发,探索了影响激励效果的途径。更多还原

【Abstract】 This paper presents the results of the experimental investigation on the effects of internal acoustic excitation on enhancing performance of the annular cascade. Based the rearch work of the frequence characteristics of the annular cascade, we investigated the mechanism of the interaction between the unsteady interference and the flow in the annular cascade systematically by means of employing unsteady excitation. The result of reseach confirmed that the aerodynamic performance of turbomachine would be improved amazingly if the interaction of unsteady interference in the flow field can be reasonably organized. We studied the approach to the acoustic excitation effect from the angle of frequence and intensity of excitation.更多还原