Acoustic dispersing airflow passage

摘要

A plenum with features to disperse acoustic energy in an airflow while maintaining a relatively small pressure drop in the airflow is disclosed. A general structure of the plenum may include a perforated airflow passage surrounded by a substantially large space enclosed between the airflow passage and a plenum. The perforated airflow passage has a perforated wall that may allow the acoustic energy to be dispersed into the substantially large space when flowing through the airflow passage. Acoustic energy dispersing materials may also be disposed in the substantially large space and/or on the perforated wall to help disperse acoustic energy by, for example, absorbing the acoustic energy. The plenum can help disperse the acoustic energy while helping minimize the pressure drop in the airflow.

主权项

1. An acoustic dispersing airflow passage, comprising:
a plenum housing having a first end and a second end; a perforated wall disposed within the plenum housing, the perforated wall having an inner side and an outer side, the outer side being disposed relatively closer to the plenum housing than the inner side, the inner side being opposite the outer side, the perforated wall surrounding an airflow passage, the perforated wall extending between the first end and the second end of the plenum housing, the perforated wall being enclosed by the plenum housing; a centrifugal fan disposed outside of the plenum housing, the centrifugal fan being fluidly connected to the airflow passage, the centrifugal fan being configured to deliver a stream of air through the airflow passage; an acoustic dispersing space between the plenum housing and the outer side of the perforated wall, the acoustic dispersing space being free of acoustic dispersing material, the acoustic dispersing space having a first volume, the acoustic dispersing space surrounding the airflow passage; the airflow passage having a second volume; and the first volume being at least two times larger than the second volume.