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A one-way fluid-acoustic and two-way fluid-acoustic coupling approach combining computational fluid dynamics and finite element acoustics has been used to predict the acoustic attenuation performance of perforated silencer/muffler in the presence of non-uniform flow. Comparisons between numerical predictions and experimental measurements show fairly good agreements.
Predictions of the acoustic attenuation of perforated silencers without and with flow indicate that the effect of flow on the acoustic attenuation of a straight perforated pipe silencer is evident at higher frequencies, while marginal in the low frequency region. bias increases the acoustic attenuation performance of perforated silencers at most frequencies. the bias flow significantly reduces the first resonance peak of the three-pass perforated tube damper and increases the acoustic attenuation in a specific frequency range. when the bias flow in the holes of the perforated tube and the bias flow in the holes of the perforated baffles exist simultaneously, this bias plays a major role in the acoustic attenuation performance of the three-pass perforated silencers.
A one-way & Two-way fluid-acoustic coupling approach is proposed to predict the acoustic attenuation performance of perforated dampers/silencer/muffler in the presence of flow. A comparison between the numerical results of this method and experimental measurements shows reasonably good agreement for three typical perforated tube silencer/muffler. The influence of the tube flow on the high-frequency acoustic attenuation of the silencer with a straight perforated tube is obvious, but marginal in the low-frequency range. Bias increases the acoustic attenuation of the flow plug and dual perforated tube mufflers at most frequencies. The bias flux significantly reduces the acoustic attenuation near the first resonant frequency of three-pass perforated dampers and increases the TL in a specific frequency range. When the bias flow in the holes of the perforated tube and the bias flow in the baffle holes exist simultaneously, this bias plays a leading role in the acoustic attenuation performance of three-pass perforated silencers.
