Figure 1b: The above six images show various types of noise-suppression devices from the AST program.
<p>From top to bottom, left to right are (1) fan and core chevron nozzles, (2) the core tongue nozzle, (3) the
tabbed fan nozzle, (4) the core lobe nozzle, (5) the scarfed fan nozzle, and (6) the vortex doublet core
</p>
nozzle (NASA/CR 2000-210040).
<p>Clayton J. Bargsten
NASA Headquarters, Washington, DC
</p><p>Malcolm T. Gibson
</p>
NASA Headquarters, Washington, DC
2011-08-01
<a rel="nofollow" class="external free" href="http://www.aeronautics.nasa.gov/ebooks/downloads/nasa_innovation_in_aeronautics.pdf">http://www.aeronautics.nasa.gov/ebooks/downloads/nasa_innovation_in_aeronautics.pdf</a>