초록

A jet engine test cell capable of dissipating infrasound. The test cell includes an engine test section, an augmentor and an exhaust stack having a structure near its open end for dissipating infrasound.

대표청구항 ▼

[ I claim:] [1.] An infrasound reducing exhaust stack for an engine test cell comprising;a closed end;an open end;a tubular exhaust stack wall extending between said closed and open ends and defining an elongated exhaust stack chamber having a direction of elongation, a stack height measured in the

[ I claim:] [1.] An infrasound reducing exhaust stack for an engine test cell comprising;a closed end;an open end;a tubular exhaust stack wall extending between said closed and open ends and defining an elongated exhaust stack chamber having a direction of elongation, a stack height measured in the said direction of elongation and a stack width measured in a direction perpendicular to said stack height;an exhaust inlet in said exhaust stack wall for receiving exhaust from said test cell; andsaid exhaust stack wall provided with an open area near said open end for dissipating infrasound within said exhaust stack, said open area formed by at least one opening in said stack wall, said at least one opening having a length measured in the direction of elongation of said exhaust stack chamber wherein the length of said opening is at least 33% of said stack width whereby said open area and its defined length relative to said stack width functions to reduce the formation of infrasound.