摘要
When gas flows through corrugated pipes,pressure waves interacting with vortex shedding can produce distinct tonal noise and structural vibration.Based on established observations,a model is proposed which couples an acoustic pipe and selfexcited oscillations with vortex shedding over the corrugation cavities.In the model,the acoustic response of the corrugated pipe is simulated by connecting the lossless medium moving with a constant velocity with a source based on a discrete distribution of van der Pol oscillators arranged along the pipe.Our time accurate solutions exhibit dynamic behavior consistent with that experimentally observed,including the lock-in frequency of vortex shedding,standing waves and the onset fluid velocity capable of generating the lock-in.
