声模涡驱动激励的降阶建模

K. Matveev
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引用次数: 16

摘要

在平均流存在的情况下,在有挡板的管道中发生的旋涡脱落常常导致声模态的激发。由此产生的流动振荡可以反馈到涡的形成过程中。利用旋涡脱落的准稳态假设和旋涡与下游挡板碰撞时的短周期声扰动假设,提出了一个简单的模型来描述这种复杂的相互作用。该模型能够预测典型的实际系统现象,如在平均流速的某些范围内涡声不稳定的主频率锁定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reduced-order modeling of vortex-driven excitation of acoustic modes
Vortex shedding that occurs in ducts with baffles in the presence of mean flow often leads to excitation of acoustic modes. Resulting flow oscillations may feed back to the process of vortex formation. A simple model is proposed for describing this complex interaction using the hypotheses for a quasi-steadiness of vortex shedding and for a short-period acoustic perturbation at the moment of vortex collision with a downstream baffle. The model is capable of predicting typical real-system phenomena, such as the lock-in of a dominant frequency of the vortex-acoustic instability in some ranges of the mean flow velocity.
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