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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
POTENTIAL OF WATER INJECTION ON THE COMBUSTION AND EMISSIONS CHARACTERISTICS IN A HCCI ETHANOL ENGINE
Submission Author:
Giovani Dambros Telli , RS , Brazil
Co-Authors:
Giovani Dambros Telli, Luiz Alberto Oliveira Rocha, Guilherme Zulian, Sergio Stefanello, Thompson Diordinis Metzka Lanzanova, Mario Martins
Presenter: Giovani Dambros Telli
doi://10.26678/ABCM.ENCIT2020.CIT20-0744
Abstract
Homogeneous charge compression ignition (HCCI) is an emerging technology that offers an alternative to conventional spark ignition and compression ignition engines. Low-temperature combustion, which can result in low NOx emissions with high indicated efficiency, is the more important characteristic of this combustion mode. The main problem is the combustion timing control due to lack of direct ignition control once HCCI flame initiation is based on the thermal charge state. Thus, controlled auto ignition (CAI) combustion mode has been proposed. Several methods were proposed for combustion phasing control, between them, the injection of water in the intake manifold. This work investigated water injection's influence in the intake runner of an ethanol HCCI cylinder from a converted three-cylinder diesel generator set. The water injection was used to control the CA50 combustion parameter. The results show that water injection is an efficient strategy to control the combustion timing since the mixture's reactivity can be controlled. The results at 400 and 600 kPa of IMEP and 1800 rpm indicated good combustion stability, high efficiency, and low emissions characteristics. However, for 200 kPa of IMEP, the combustion was unstable; the indicated efficiency deteriorated, and indicted CO emissions were high.
Keywords
Homogeneus Charge Compression Ignition, Cotrolled Auto Ignition, Water injection, ethanol, Internal combustion engine
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