NUMERICAL STUDY OF METHANE PYROLYSIS INSIDE A SINGLE-CHANNEL SHOCK WAVE REFORMER

S. V. Mahmoodi-Jezeh, Stefan Tüchler, Ghislain Madiot, Mark Davidson, Pejman Akbari, Colin D. Copeland

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding

Abstract

The paper describes a numerical investigation of the thermal decomposition of methane to hydrogen and carbon within a single-channel, four-port wave rotor using a three-dimensional (3-D), Reynolds-averaged Navier–Stokes (RANS) CFD model. This work is in support of the New Wave Hydrogen, Inc. (NWH2) proprietary technology development. A Menter’s k − ω SST turbulence is used for the closure of the mean momentum equations and is coupled to multispecies transport equations with a one-step finite-rate chemistry model. The kinetic model is validated based on a set of measurement data of a double-diaphragm shock tube case. To further examine the predictive accuracy of the numerical approach, the results of the 3-D single-channel wave rotor are compared with those of quasi-one-dimensional unsteady model that has been previously reported extensively in literature. It is observed that when the wave rotor channel is exposed to the high-pressure driven gas (HPDRVN) port, a secondary right-running shock wave is generated, which greatly energizes the flow around the HPDRVN port, resulting in large magnitudes of pressure and temperature; and consequently, the cracking of methane into hydrogen and carbon. The comparison between 1-D and 3-D simulation results indicate that the LPDRVN gas penetration is around 75% of the channel width in the case of 1-D, but is below 50% in the 3-D case. Furthermore, the conversion rate of methane in the 3-D case is one order of magnitude smaller than that in the 1-D case.

Original languageEnglish
Title of host publicationCoal, Biomass, Hydrogen, and Alternative Fuels; Controls, Diagnostics, and Instrumentation; Steam Turbine
PublisherThe American Society of Mechanical Engineers(ASME)
ISBN (Electronic)9780791885987
DOIs
Publication statusE-pub ahead of print - 28 Oct 2022
EventASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition, GT 2022 - Rotterdam, Netherlands
Duration: 13 Jun 202217 Jun 2022

Publication series

NameProceedings of the ASME Turbo Expo
Volume2

Conference

ConferenceASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition, GT 2022
Country/TerritoryNetherlands
CityRotterdam
Period13/06/2217/06/22

Keywords

  • hydrogen production
  • methane pyrolysis
  • turbulence simulation
  • wave rotor

ASJC Scopus subject areas

  • Engineering(all)

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