Experimental analysis on the effect of hydrogen supply systems in a diesel dual fuel engine

Abstract

An experimental investigation on dual fuel (DF) operation of a diesel engine with hydrogen as the main fuel and diesel as the pilot fuel has been performed. The focus has been made on gaseous fuel delivery system for performance enhancement during DF operations. Two techniques of hydrogen delivery namely, manifold port induction and manifold port injection are compared in the DF engine. In the case of manifold induction, the gas is introduced with the help of a gas mixture in the intake manifold, whereas in the case of manifold injection, the gas is introduced with the help of an injector. The injector is located close to the intake valve and its timing is controlled through an electronic control unit. It was found that hydrogen manifold injection improves the diesel substitution and thermal efficiency of the DF engine as compared to manifold induction technique. The diesel substitution was improved by 2.3% and 1.5% at low and high loads respectively. Similarly, the brake thermal efficiency was improved by 0.4% and 0.5% at low and high loads respectively.