Tohoku University · Engineering
Professor Akihiro Hayakawa's research lab specializes in combustion science, with a focus on fundamental combustion characteristics of alternative fuels such as ammonia. The lab investigates ammonia flame behavior, NOx formation mechanisms, and chemiluminescence under varying pressure conditions, aiming to support the development of clean-burning, carbon-free energy systems. Numerical simulations are employed alongside experimental studies to understand and optimize flame stability and pollutant reduction. The lab also explores turbulent flame propagation, particularly the differences between spherically expanding and burner-stabilized flames, to improve predictive models for practical combustion applications.
Figures are computed from collected data and may differ slightly.
Ammonia is a carbon-free fuel and its application to internal combustion engines is expected. However, few studies on ammonia flames, especially at high pressures, have been carried out because ammonia has not been considered to be a fuel owing to its lower combustion intensity. Most of NOx, which is formed by ammonia combustion, is considered to be the fuel NOx. The objectives of this study were to investigate the fundamental characteristics of NOx experimentally, such as NO emission and chemil
Burning velocity of spherically propagating turbulent flames kept increasing with flame propagation. On the other hand, turbulent burning velocity obtained from burner stabilized flame is constant for a given turbulence intensity. This difference of turbulent burning velocity characteristic was discussed by Abdel-Gayed and Bradley et al. For spherically propagating flames, not all turbulent eddies contribute to the turbulence that affect the turbulent flame. Small flames may be wrinkled only by
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