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Transonic drag of several jet-noise suppressors

Author / Creator
North, Warren J., author
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Online
Summary

An experimental evaluation of the aerodynamic drag of several jet noise suppressors was conducted. The one-fifth scale suppressors were tested over a Mach number range from 0.65 to 1.10 at several ...

An experimental evaluation of the aerodynamic drag of several jet noise suppressors was conducted. The one-fifth scale suppressors were tested over a Mach number range from 0.65 to 1.10 at several nozzle pressure ratios.

The least drag was caused by the lobe-type suppressors. The eight-lobe nozzle with ejector caused the greatest drag.

The cruise propulsive-thrust loss of the tube nozzle and the eight-lobe nozzle tith ejector should be about 6 1/2 percent of the net thrust for the standard nozzle. The lobe nozzles and the standard nozzle with ejector should cause losses equivalent to 3 or 4 percent of the standard-nozzle net thrust.

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