You could have downloaded NOZZLE 1.0 from our software library for free. The program lies within Photo & Graphics Tools, more precisely Converters. The following versions: 3.7 and 1.0 were the most frequently downloaded ones by the program users. This software was originally developed by AeroRocket. NOZZLE.exe, Nozzle10.exe or NozzleDemo.exe are the common file names to indicate this program's installer.
From the developer:
Nozzle is a one-dimensional with cross-sectional area variation, compressible flow computer program for the analysis of converging-diverging nozzles. Nozzle internal flow may be entirely subsonic, entirely supersonic or a combination of subsonic and supersonic including shock waves in the diverging part of the nozzle.
You may want to check out more software, such as BurnSim, PhotoFiltre Studio or ConeT, which might be related to NOZZLE.