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The Effect of Nozzle Trailing Edge Thickness on Jet Noise
The Effect of Nozzle Trailing Edge Thickness on Jet Noise
* † ‡
Brenda Henderson , Kevin Kinzie , and Henry Haskin
NASA Langley Research Center Hampton, Virginia 23681
The effect of nozzle trailing edge thickness on broadband acoustic radiation and the
production of tones is investigated for coannular nozzles. Experiments were performed for a
core nozzle trailing edge thickness between 0.38 mm and 3.17 mm. The on-set of discrete
tones was found to be predominantly affected by the velocity ratio, the ratio of the fan
velocity to the core velocity, although some dependency on trailing edge thickness was also
noted. For a core nozzle trailing edge thickness greater than or equal to 0.89 mm, tones
were produced for velocity ratios between 0.91 and 1.61. For a constant nozzle trailing edge
thickness, the frequency varied almost linearly with the core velocity. The Strouhal number
based on the core velocity changed with nozzle trailing edge thickness and varied between
0.16 and 0.2 for the core nozzles used in the experiments. Increases in broadband noise with
increasing trailing edge thickness were observed for tone producing and non-tone producing
conditions. A variable thickness trailing edge (crenellated) nozzle resulted in no tonal
production and a reduction of the broadband trailing edge noise relative to that of the
corresponding constant thickness trailing edge.
I. Introduction
Th
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