Experimental evaluation of the optimal turbocharger system for a multi-cylinder dual-fuel engine towards the operation in transient conditions
[EN] Alternative low-temperature combustion, particularly through dual-mode-dual-fuel (DMDF) concepts, offers promising emission reductions for medium and heavy-duty vehicles, which face challenges in electrification due to payload demands. This technology has shown potential in achieving ultra-low...
| Authors: | , , , |
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| Format: | article |
| Publication Date: | 2025 |
| Country: | España |
| Institution: | Universitat Politècnica de València (UPV) |
| Repository: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Language: | English |
| OAI Identifier: | oai:riunet.upv.es:10251/230331 |
| Online Access: | https://riunet.upv.es/handle/10251/230331 |
| Access Level: | Embargoed access |
| Keyword: | Dual-fuel combustion Reactivity controlled compression ignition Turbocharger selection Transient engine response |
| Summary: | [EN] Alternative low-temperature combustion, particularly through dual-mode-dual-fuel (DMDF) concepts, offers promising emission reductions for medium and heavy-duty vehicles, which face challenges in electrification due to payload demands. This technology has shown potential in achieving ultra-low NOx and soot emissions without costly after-treatment systems. However, literature gaps exist in achieving necessary EGR dilution ratios and boost pressures at low speeds with standard turbochargers. This study experimentally evaluates the optimal turbocharger selection for a 7.7 L dual-fuel engine under the DMDF concept. A detailed calibration methodology was used to adjust a new turbocharger to comply with EURO VI emissions standards. Experimental results validated the numerical findings of a previous numerical selection of the prototype turbocharger system, showing improved fuel consumption and air management at low speeds with the new configuration. However, the smaller turbocharger faced limitations impacting emissions at high loads, though the benefits remained significant. Further experimental work explored transient responses under two homologation cycles up to 50 % capacity. These tests demonstrated the new turbocharger's enhanced response, especially when transitioning between loads, indicating improved air intake management. While there were improvements in CO and HC conversion efficiencies, meeting EURO VI standards under dynamic conditions remained challenging, highlighting the need for continued optimization in handling transient responses in dual-fuel engines. |
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