Numerical Investigation of Dual Fuel Combustion on a Compression Ignition Engine Fueled with Hydrogen/Natural Gas Blends

The present work aims to assess the influence of composition blends hydrogen (H2) and Natural Gas (NG) on Dual Fuel (DF) combustion characteristics, including gaseous emissions. 3D-CFD study is carried out by means a customized version KIVA-3V code. An automotive 2.8 L, 4-cylinder turbocharged diesel engine was previously modified in order operate DF NG–diesel mode, tested at dynamometer bench. After validation against experimental results, numerical model applied perform set simulations 3000 rpm–BMEP = 8 bar, H2/NG-diesel mode. Different H2–NG are considered: as H2 mole fraction varies from 0 vol% 50 vol%, fuel energy within premixed charge kept constant. Start Of Injection (SOI) also investigated. Simulation results demonstrate that enrichment accelerates process promotes its completion, strongly decreasing UHC CO Evidently, CO2 specific emissions reduced (up about 20%, H2). main drawbacks faster include an increase in-cylinder peak pressure rate rise, NOx However, demonstrates optimization SOI can eliminate all aforementioned shortcomings.