Fig. 21From: Noise control for high subsonic jet flows by inner wall treatmentComparison of the 1/3 octave noise between the baseline and the WIW-treated nozzles. a \({30}^{\circ }\); b \({60}^{\circ }\); c \({90}^{\circ }\); d \({120}^{\circ }\)Back to article page