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Old   February 3, 2005, 08:01
Default Subsonic-supersonic nozzle
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I am a new user of CFX program. I was testing a subsonic-supersonic nozzle, with this characteristics: inlet: stagnation temperature 300K and stagnation pressure 10 atm (absolute) and outlet: supersonic. Using air (ideal gas model). Because I get incorrect answers? ps. The mack number in through are not one! Thanks
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Old   February 4, 2005, 04:40
Default Re: Subsonic-supersonic nozzle
Bart Prast
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First use an pressure outlet with a lower than critical ratio with the inlet pressure. Your supersonic flow will develop then. Starting with a supersonic outlet with automatic startup is not good as the initial velocity is probably subsonic.
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