Experimental Investigation of Hydrogen Jet for Direct Injection in ICE

Hydrogen is considered as one of the potential clean fuels because of its zero-carbon nature and it has attracted considerable attention in the automotive industry for transition toward zero-emission. Since the H2 jet dynamics play a significant role in the fuel/air mixing process of direct injection spark ignition (DISI) engines, the current study focuses on experimental hydrogen jet characterization in terms of mass flow rate measurements and morphology investigation under a wide range of enginelike conditions by a Compressed Hydrogen Gas (CHG) injector used for typical direct injection applications. A measuring system, suitable for the gaseous fuels, was used for measuring the instantaneous flow rate as well the dynamic behavior of the injection system. High-speed z-type schlieren imaging was applied in a constant volume chamber to investigate the evolution and shockwave structures of highly under-expanded H2 jets