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Numerical Investigating of the Methane Pyrolysis for Hydrogen Production Using Rotating Detonation Combustion Products

Zakeri Zarch, Mohammad Ali | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58658 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Farshchi, Mohammad; Salehi, Mohammad Mahdi
  7. Abstract:
  8. This study evaluates hydrogen production from methane cracking driven by the hot products of a rotating detonation combustor. A 2-D axisymmetric, steady, adiabatic Fluent model (ideal gas, no-slip; SST turbulence; species with GRI-3.0) used two inlets: H₂/air detonation products at 100 g/s and 2000 K, and methane at 7.342 g/s and 700 K with steam-to-methane = 3. In the base case, a central recirculation and a shear layer govern mixing and heat transfer: temperature peaks near the reactor inlet and then drops due to mixing and endothermic reactions. The outlet shows 1750 K mean temperature, hydrogen production of 1.4 g/s, and 1.3 g/s residual methane, indicating high conversion. Sensitivity tests revealed that tripling the methane flow (1:1 steam/methane) cools the field and weakens cracking, lowering mean temperature to 1560 K and hydrogen to 1.0 g/s, with more unreacted methane and reduced steam consumption. Adding 45° swirl to the methane jet mainly alters the near-inlet structure but, dominated by detonation-product momentum, yields no meaningful change in mean outlet temperature; residence time and mild oxidation rise slightly. A 60° radial component forces earlier shear-layer impingement and penetration into the hot recirculation, cutting CO by 26% and increasing CO₂ by 37% versus baseline. Doubling the methane-inlet area reduces jet velocity and eases initial mixing, nudging hydrogen up 2% but raising total greenhouse gases 45%. Overall, hydrogen yield is controlled by temperature and mixing topology; strategies must preserve high mean temperature while shaping the methane jet and residence time to suppress unwanted oxidation
  9. Keywords:
  10. Hydrogen Producing ; Chemical Mechanism ; Rotating Detonation Combustion Modeling ; Computational Fluid Dynamics (CFD) ; Methane Pyrolysis

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