| 摘要 |
An apparatus, system and method for improving air entrainment and sound attenuation of gases being discharged from one or more outlet portions of an exhausting device using an acoustic wind band. The acoustical wind band helps improve entrainment of ambient environmental air with the exhaust gases being discharged from the exhausting device resulting in a tight plume of high velocity flow which improves the effectiv e stack height of the exhausting device. This is achieved by positioning the sections of the acoustical wind band in spaced relation thus forming passages that allow outside ambient environmental air to flow into the acoustical wind band to mix with and dilute the exhausting gas. The sections may also be positioned extending upward and inward at an angle to further enhance the entrainment of ambient environmental air with the flow of exhaust gas from t he gas exhaust device. The acoustical wind band also helps to block noise, especially line of sight noise, from the outlet of the exhausting device thereby improving sound attenuation . This may be achieved by having at least a portion of the bottom end of a lowest most section extend into the horizontal plane defined by the line of sight and having at least a portion of the top end and the bottom end of adjacent sections be coplanar, or preferably overlap, one another to block noise generated by the exhaust device or exhaust gas at the discharge from directly exiting the wind band. In addition, the acoustical wind band helps to protec t the vena contracta produced by the converging flow (plume)of exhaust gas from environmental conditions, such as for example, wind shear.
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