Journal
ENERGY
Volume 128, Issue -, Pages 519-530Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2017.04.052
Keywords
Natural gas; Rotary engine; Injection timing; Injection angle; Mixture formation; Combustion process
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Funding
- National Natural Science Foundation of China [51606089, 51576093]
- China Postdoctoral Science Foundation [2016M601735]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Startup Foundation of Jiangsu University [16JDG045]
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The application of direct injection (DI) technology is considered as a key solution to the problems of combustion efficiency and emissions on the rotary engine. This work aimed to numerically study the combined effect of injection timing (IT) and injection angle (IA) on mixture formation and combustion process in the 3D flow field of a DI natural gas rotary engine. On the basis of the 3D dynamic simulation model which was established in our previous work [29, 30], some critical information was obtained which was difficult to acquire through experiment. Simulation results showed that to satisfy the ideal fuel distribution for high combustion rate, a small IA should be used when the IT was at the early stages of intake stroke, and a big IA should be used when the IT was at the early stages of compression stroke. However, when the IT was at the middle and later stages of intake stroke, the IA which could satisfy the ideal fuel distribution, was difficult to determine with the changed IT in the middle and later stage of intake stroke. For the above reason, the middle and late stage of intake stroke was not recommended as injection timing in engineering application. (C) 2017 Elsevier Ltd. All rights reserved.
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