EXHAUST GAS HEAT RECOVERY THROUGH SECONDARY EXPANSION CYLINDER AND WATER INJECTION IN AN INTERNAL COMBUSTION ENGINE

Main Article Content

Hazhir EBNE-ABBASI Ali NASSIRI TOOSI Amir Hassan KAKAEE

Abstract

To enhance thermal efficiency and increase performance of an internal combustion engine, a novel concept of coupling a conventional engine with  a secondary 4-stroke cylinder and direct water injection process is proposed. The burned gases after working in a traditional 4-stroke combustion cylinder are transferred to a secondary cylinder and expanded even more. After recompression of the exhaust gases, pre-heated water is injected at top dead center (TDC). The evaporation of injected water not only recovers heat from exhaust gases, but also increases the mass of working gas inside the cylinder, therefore improves the overall thermal efficiency. A 0D/1D model is used to numerically simulate the idea. The simulations outputs showed that the bottoming cycle will be more efficient at higher engines speeds, specifically in a supercharged/turbocharged engine, which have higher exhaust gas pressure that can reproduce more positive work. In the modeled supercharged engine, results showed that brake thermal efficiency can be improved by about 17% and brake power by about 17.4%.

Article Details

How to Cite
EBNE-ABBASI, Hazhir; NASSIRI TOOSI, Ali; KAKAEE, Amir Hassan. EXHAUST GAS HEAT RECOVERY THROUGH SECONDARY EXPANSION CYLINDER AND WATER INJECTION IN AN INTERNAL COMBUSTION ENGINE. Thermal Science, [S.l.], mar. 2017. ISSN 2334-7163. Available at: <http://thermal-science.tech/journal/index.php/thsci/article/view/2205>. Date accessed: 28 july 2017. doi: https://doi.org/10.2298/TSCI150915282N.
Section
Articles
Received 2017-03-03
Accepted 2017-03-13
Published 2017-03-13

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