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Investigating the Influence of Water Injection on the Emissions of a Diesel Engine

Kettner, M. and Dechent, S. and Hofmann, M. and Huber, E. and Arruga, H. and R., Mamat and G., Najafi (2016) Investigating the Influence of Water Injection on the Emissions of a Diesel Engine. Journal of Mechanical Engineering and Sciences (JMES) , 10 (1). pp. 1863-1881. ISSN 2289-4659 (print); 2231-8380 (online)

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There are many methods to decrease the nitrogen oxide emissions of a diesel engine. One promising measure is water injection into the engine’sintake manifold. As emission limits become more and more stringent, the diesel engine NOx–particulate trade-off is a challenge for engine developers. To overcome this challenge, a single-point water injection system has been developed to investigate the influence of different amounts of injected water on the behaviour of a 4-cylinder diesel engine. The amount of injected water was varied from 0 to 100% water-to-fuel ratio in part-load operation (BMEP = 2, 3.5 and 5 bar). The influence on the intake air cooling effect, exhaust emissions, combustion and engine parameters was evaluated. The combustion temperature and the NOx emissions decreased drastically (63% NOx decrease for a BMEP of 5 bar and a waterto-fuel ratio of 100%). This benefit had the drawback of an increase of the particle matter emission at high water-to-fuel ratio. The combustion process and performance parameters regarding efficiency, torque and fuel consumption were marginally influenced by the water injection. This work has achieved a major reduction of NOx raw emissions of a diesel engine. Further research lines could include research on water injection at high load operation points in the engine map.

Item Type: Article
Uncontrolled Keywords: Diesel engine; water injection; NOx emission
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 08 Nov 2016 03:21
Last Modified: 30 Jan 2018 02:35
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