An analytic study of applying Miller cycle to reduce NOx emission from petrol engine |
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| Affiliation: | 1. School of Marine Science and Technology, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom;2. Mechanical Engineering College, Guangxi University, Nanning, Guangxi 530004, China;3. Nanning College for Vocational Technology, Nanning, Guangxi 530003, China;4. Guangxi University of Technology, Liuzhou 545006, China;5. Mechanical Engineering College, University of Science and Technology Beijing, Beijing, China;1. Department of Naval Architecture and Marine Engineering, Yildiz Technical University, Besiktas, 34349 Istanbul, Turkey;2. Department of Marine Engineering Operations, Yildiz Technical University, Besiktas, 34349 Istanbul, Turkey;1. Yildiz Technical University, Naval Arch. and Marine Eng. Depart, Besiktas, Istanbul, Turkey;2. Yildiz Technical University, Marine Eng. Depar, Besiktas, Istanbul, Turkey;3. Sakarya University Mechanical Engineering Department, Sakarya, Turkey;1. School of Mechanical Engineering, Northwestern Polytechnical University, Xi’an 710072, China;2. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;3. Peng Cheng Laboratory, Shenzhen 518055, China |
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| Abstract: | An analytic investigation of applying Miller cycle to reduce nitrogen oxides (NOx) emissions from a petrol engine is carried out. The Miller cycle used in the investigation is a late intake valve closing version. A detailed thermodynamic analysis of the cycle is presented. A comparison of the characters of Miller cycle with Otto cycle is presented. From the results of thermodynamic analyses, it can be seen that the application of Miller cycle is able to reduce the compression pressure and temperature in the cylinder at the end of compression stroke. Therefore, it lowers down the combustion temperature and NOx formation in engine cylinder. These results in a lower exhaust temperature and less NOx emissions compared with that of Otto cycle. The analytic results also show that Miller cycle ratio is a main factor to influence the combustion temperature, and then the NOx emissions and the exhaust temperature. The results from the analytic study are used to analyse and to compare with the previous experimental results. An empirical formula from the previous experimental results that showed the relation of NOx emissions with the exhaust temperature at different engine speed is presented. The results from the study showed that the application of Miller cycle may reduce NOx emissions from petrol engine. |
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