1D energy, exergy, and performance assessment of turbocharged diesel/hydrogen RCCI engine at different levels of diesel, hydrogen, compressor pressure ratio, and combustion duration. (18th June 2021)

• Record Type: Journal Article
• Authors: Taghavifar, Hadi; Nemati, Arash; Salvador, F.J.; De la Morena, J.
• Is Part Of: International journal of hydrogen energy. Volume 46:Number 42(2021)
• Page Start: 22180
• Page End: 22194
• Publication Date: 2021-06-18
• Subjects: 1D thermodynamic simulation -- Diesel -- Exergy -- Hydrogen -- RCCI -- Turbocharging; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2021.04.035
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: There is a growing concern about the feasibility of a new generation of internal combustion engines in a low-temperature and efficient way that can meet the emission regulations while maintaining the desirable power performance. This requires the controllability and flexibility over the ignition and reactivity within the cylinder by handling two fuels with different chemical reaction intensity. In this research, the reactivity controlled compression ignition (RCCI) turbocharger-assisted engine is proposed that operates with diesel-hydrogen fuels. After calibration and model validation, the effect of pressure ratio of compressor in turbocharger, hydrogen energy share, diesel mass per cycle, and combustion duration on temperature rise, entropy, pressure, heat release, and engine performance is evaluated. The design variables effects on the exergy share of work, heat, exhaust loss, irreversibility, and exergetic performance coefficient (EPC) are assessed and analyzed. Increasing the compressor pressure ratio can significantly increase the engine power and reduce fuel consumption. It is proved that turbocharging can reduce the entropy generation and thereby reduce irreversibility. The lower diesel injection is favored in terms of the work exergy and the EPC. Highlights: Diesel-hydrogen RCCI engine cycle simulation with exergy analysis. Hydrogen addition, diesel injection, turbocharger pressure ratio, compression pressure as input variants. Highest work exergy share (47.8%) and EPC pertains to the case with lowest diesel injection. Temperature rise rate and entropy generation best controlled by higher compressor pressure ratio. Combustion duration increase leads rise in exhaust losses with declined pressure rise.