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74 Hydrogen injection into a scramjet combustion chamber at Mach 6.4

- April 8, 2026 at 5:53 pm
  
  gianlucapagani
  Subscriber
  
  I'm having problems with my Fluent setup. I'm simulating hydrogen combustion in a scramjet combustion chamber, where air enters at M = 2.01709 M at T = 1076.37 K and P = 90194.6 Pa with chemical properties of O = 0.21 N = 0.79. Hydrogen is injected at M = 1 at T = 250 K and P = 180707.4 Pa with chemical properties of H2 = 1. I'm running with the K-Kl-omega turbulence model. I created a structured mesh respecting Y+< 1. When running with 50,000 initial iterations and plotting the hydrogen results, I noticed that there was no H2 injection. What could be going wrong with the setup?
- April 8, 2026 at 8:36 pm
  
  SamW
  Ansys Employee
  
  You're saying the H2 is injected, is this via a DPM setup, or is there some other injection/inflow method specified? And are you sure that there's 0 H2? I notice the colorbar for your H2 contour goes all the way to 1 - was the auto range turned off?

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