| Autor: |
Aznar, Miguel, Pineda, Daniel, Cage, Bradley, Corvello, Johnathan, Shi, Xian, Chen, Jyh-Yuan, Dibble, Robert |
| Rok vydání: |
2022 |
| DOI: |
10.17605/osf.io/pt67q |
| Popis: |
Replacing the working fluid of internal combustion engines with a monatomic gas is a promising solution to achieve higher efficiency power generation. The resulting higher temperatures raise an additional challenge with engine knock, limiting the operational range of such a cycle. Direct injection of fuel is a solution to control engine knock by regulating the heat release rate in the combustion chamber. However, the direct injection of gaseous fuel is itself an active topic of research and presents additional fuel-oxidizer mixing challenges. In this study, a single-hole direct injector was used to characterize and compare the influence of argon and nitrogen atmospheres on hydrogen and methane jets. High-speed schlieren imaging was used to characterize non-reacting jets, and we evaluated the spread angle and penetration depth at different chamber and injection pressures. We subsequently assessed the feasibility of methane direct-injection in a modified single cylinder research engine with an argon-oxygen mixture as the working fluid. We compared engine performance operating with both argon-oxygen and air as working fluids by measuring fuel flow rate, in-cylinder pressure, torque, and emissions. Our results show that the penetration depths and spread angles of methane and hydrogen jets are notably different but not significantly reduced in an argon atmosphere compared to a nitrogen atmosphere. Additionally, running the modified engine with an argon-oxygen mixture in spark assisted compression ignition operation leads to improvements in efficiency up to 50 percent relative to spark-ignited air cycles, and NOX emissions are nearly eliminated. Our results encourage more studies in which the exhausted argon is recycled into the intake. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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