Hydrogen enrichment effects on the second law analysis of a lean burn natural gas engine

ÖZCAN H.

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, cilt.35, sa.3, ss.1443-1452, 2010 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 35 Sayı: 3
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.ijhydene.2009.11.039
  • Dergi Adı: INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1443-1452
  • Anahtar Kelimeler: Second law analysis, Hydrogen enrichment, Natural gas, Lean burn, Internal combustion engines, SPARK-IGNITION ENGINE, INTERNAL-COMBUSTION ENGINES, EMISSION CHARACTERISTICS, AVAILABILITY ANALYSIS, 2ND-LAW ANALYSIS, AIR MIXTURES, SI ENGINE, PERFORMANCE, METHANE, OPERATION
  • Ondokuz Mayıs Üniversitesi Adresli: Evet

Özet

This paper presents a computational work aimed at investigating the effects of hydrogen addition on the exergy (or availability) balance in a lean burn natural gas spark ignition (SI) engine. A thermodynamic engine cycle simulation was extended to perform the exergy analysis. A zero dimensional, two-zone computational model of the engine operation was used for the closed part of the cycle. The results of the model were compared with experimental data to demonstrate the validation of the model. Exergetic terms, such as exergy transfer with heat, exergy transfer with work, irreversibilities, fuel chemical exergy, and total exergy, were computed based on principles of the second law. The exergetic (the second law) efficiency was also calculated. The results of exergy analysis show that increasing hydrogen content and lean burn have considerably affected the exergy transfers, irreversibilities and second law efficiency. With increasing hydrogen content, the irreversibility produced during combustion decreases, and the second-law efficiency sharply increases at near the lean limit. (C) 2009 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.