The impact of hydrogen percentage on the combustion, performance, and emissions of NG-H2-diesel naturally aspirated engine at high engine load

Key Points

Increasing hydrogen in the fuel mixture reduces brake specific fuel consumption, carbon monoxide, total hydrocarbon emissions, and smoke.
At high engine load, hydrogen addition raised in-cylinder peak pressure and nitrogen oxides emissions.
Mechanical diesel injection pump controlled diesel flow while hydrogen and natural gas were supplied through controlled flow rates.
Experimental investigation provides essential insights for industry applications and future scientific studies.

Abstract

This research involved an experimental investigation of gradually increasing hydrogen (H 2 ) percentage in fuel mixture on the combustion, performance, and emissions of H 2 -natural gas (NG)-diesel naturally aspirated engine at high load (20 kW). A mechanical diesel injection pump (MDIP) automatically controlled the diesel flow. Simultaneously, the NG was supplied with constant pressure and a fully open line, while a flow control valve and flowmeter adjusted the H 2 flow rate. A gas-air mixer was positioned at the intake manifold to supply the engine with NG and H 2 , while the diesel was directly injected. The results indicated that increasing H 2 in the fuel mixture reduces BSFC, CO, THC, and smoke, but increases in-cylinder peak pressure and NO X emissions. The detailed results are valuable and usable for industry implementations and upcoming scientific studies.

The impact of hydrogen percentage on the combustion, performance, and emissions of NG-H2-diesel naturally aspirated engine at high engine load

Key Points

Abstract

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