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  1. بررسی عددی تجزیه متان برای تولید هیدروژن با استفاده از محصولات احتراق دتونیشن چرخشی
بررسی عددی تجزیه متان برای تولید هیدروژن با استفاده از محصولات احتراق دتونیشن چرخشی
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بررسی عددی تجزیه متان برای تولید هیدروژن با استفاده از محصولات احتراق دتونیشن چرخشی

ذاکری زارچ، محمد علی Zakeri Zarch, Mohammad Ali

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

Zakeri Zarch, Mohammad Ali | 2025

165 Viewed
  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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