Effects of low-level hydroxy as a gaseous additive on performance and emission characteristics of a dual fuel diesel engine fueled by diesel/biodiesel blends

Bahman Najafi, Farid Haghighatshoar, Sina Ardabili, Shahab S. Band, Kwok wing Chau, Amir Mosavi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)


In the present study, water electrolysis was employed for Hydroxy gas (HHO) production as a gaseous additive. The engine test was performed using the Diesel, B5, and B20 as pilot fuels. HHO was imported into the engine's combustion chamber at three volumetric flow rates of 3, 4, and 5 cc/s through the inlet manifold as the low-level HHO rate.The engine test setup was a single-cylinder dual-fueled diesel engine at a constant speed (1500 rpm) and full load condition. According to the results, HHO by 3 and 4 cc/s did not have a significant effect on BP, BTE, and BSFC. Using HHO gas by 5 cc/s significantly increased BP by about 2.5, 3.1, and 0.5% compared with Diesel, B5 and B20, respectively, and decreased BSFC by about 11, 7.8, and 13.5% compared with Diesel, B5, and B20, respectively.HHO gas by 5 cc/s significantly decreased CO2 by about 7, 6.3, and 10.6% compared with Diesel, B5, and B20, respectively, and decreased CO emissions by about 6, 14.3, and 21.2% compared with Diesel, B5 and B20, respectively. However, the use of HHO gas and biodiesel increased NOx emission by about 16, 13.7, and 10.5% compared with Diesel, B5, and B20, respectively.

Original languageEnglish
Pages (from-to)236-250
Number of pages15
JournalEngineering Applications of Computational Fluid Mechanics
Issue number1
Publication statusPublished - 2021


  • diesel engine
  • dual fuel combustion
  • gaseous additive
  • hydrogen
  • Hydroxy gas
  • renewable energy
  • water electrolysis

ASJC Scopus subject areas

  • Computer Science(all)
  • Modelling and Simulation

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