Autoignition Characterization of Hydrogen Directly Injected into a Constant-Volume Combustion Chamber through a Heavy-Duty Injector

Antonio Caricato, Antonio Paolo Carlucci (), Magda Elvira Cassone Potenza, Domenico Laforgia, Marco Torresi and Luciano Strafella ()
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Antonio Caricato: Department of Engineering for Innovation, University of Salento, Via per Arnesano, 73100 Lecce, Italy
Antonio Paolo Carlucci: Department of Engineering for Innovation, University of Salento, Via per Arnesano, 73100 Lecce, Italy
Magda Elvira Cassone Potenza: Department of Mechanical Engineering, Mathematics and Management (DMMM), Polytechnic University of Bari, Via Orabona 4, 70126 Bari, Italy
Domenico Laforgia: Department of Engineering for Innovation, University of Salento, Via per Arnesano, 73100 Lecce, Italy
Marco Torresi: Department of Mechanical Engineering, Mathematics and Management (DMMM), Polytechnic University of Bari, Via Orabona 4, 70126 Bari, Italy
Luciano Strafella: Department of Engineering for Innovation, University of Salento, Via per Arnesano, 73100 Lecce, Italy

Energies, 2023, vol. 16, issue 19, 1-14

Abstract: One factor limiting the exploitation of hydrogen as a fuel in internal combustion engines is their tendency to autoignition. In fact, on one hand, its low activation energy facilitates autoignition even with low compression ratios; on the other hand, this can become uncontrollable, due, for instance, to the presence of hot spots in the combustion chamber or to the collision of hydrogen on close surfaces. This represents a limit to the use of hydrogen at medium–high loads, therefore limiting the power density of the engine. In this work, hydrogen was injected at a pressure ranging between 15 and 25 bars into a constant-volume combustion chamber in which the temperature and pressure were increased by means of a previous combustion event. The phenomena taking place after hydrogen injection were observed through fast image acquisition and characterized by measuring the chamber pressure and temperature. In particular, ignition sites were established. The physical system was also modeled in Ansys Fluent environment, and the injection and mixture formation were simulated in order to evaluate the thermo-fluid dynamic field inside the combustion chamber just before autoignition.

Keywords: internal combustion engines; hydrogen; injector; autoignition; simulation modeling; CFD simulations (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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