Abstract
The radiation of impulsive sound, i.e., pulse, from a flanged cylindrical duct at the open end is investigated using a high accuracy 7-point optimized DRP scheme. The computed result shows that an expansion wave near the open end on the inner wall of duct is produced immediately after the compression pulse radiates from the open end. The strength of the radiated wave is closely related to the pressure gradient of the wave near open end. The present results also clarify that the length of pulse significantly changes the characteristics of wave pattern.
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