Analysis of Improved Combustion Characteristics and NOx Emission of an SI-HCNG Engine

Paper #:
  • 2012-01-0874

Published:
  • 2012-04-16
DOI:
  • 10.4271/2012-01-0874
Citation:
Yoo, H., Lee, D., and Huh, K., "Analysis of Improved Combustion Characteristics and NOx Emission of an SI-HCNG Engine," SAE Technical Paper 2012-01-0874, 2012, https://doi.org/10.4271/2012-01-0874.
Pages:
11
Abstract:
The purpose of this study is to analyze the performance of a spark ignition (SI)-HCNG (Hydrogen Compressed Natural Gas) engine by KIVA-3V. Turbulent premixed combustion is modeled by an independent transport equation for the mean reaction progress variable. The turbulent burning velocity is given by a phenomenological correlation in terms of laminar flame speed and turbulent intensity. The resulting flame speeds are validated against measured data in literature with parametric variation of turbulent intensity and H₂ fraction. Results showed good agreement with measured efficiencies and NOx emissions for varying air/fuel ratios and hydrogen fractions in CNG fuel. It is shown possible to satisfy the target of improved efficiency and reduced NOx of the test SI-HCNG engine due to enhanced lean flammability limits of CNG premixture with hydrogen.
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