High expansion cycle for marine 2-stroke engine
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초록
A diesel engine has the same length as the compression and expansion strokes, but a Miller cycle was introduced that achieved a higher expansion than the compression cycle by operating the changing intake valve. The Miller cycle is a low-compression and high-expansion cycle, so it can achieve high efficiency and NOx reduction effect. However, high-efficiency turbochargers must be adopted simultaneously owing to the reduction of the exhaust energy entering the turbines. This study theoretically reviewed the possibility of applying high expansion cycles and 2-stage T/C to 2-stroke marine diesel engines and considered their effects. The highest pressure ratio that can be achieved in 2-stage T/C system can be obtained when the pressure distribution between the low-and high-pressure stages is the same. A low compression – high expansion cycle was applied to reduce the maximum combustion temper-ature by more than 200 K, and the 2-stage T/C was simultaneously applied to increase the scavenge air pressure by approximately 4 bar and Pmax by approximately 30 bar. The theoretical review confirmed that the application of the 2-stage T/C and the effect of low compression – high expansion, which is the Miller cycle, can be achieved for a marine 2-stroke engine.
Abstract
A diesel engine has the same length as the compression and expansion strokes, but a Miller cycle was introduced that achieved a higher expansion than the compression cycle by operating the changing intake valve. The Miller cycle is a low-compression and high-expansion cycle, so it can achieve high efficiency and NOx reduction effect. However, high-efficiency turbochargers must be adopted simultaneously owing to the reduction of the exhaust energy entering the turbines. This study theoretically reviewed the possibility of applying high expansion cycles and 2-stage T/C to 2-stroke marine diesel engines and considered their effects. The highest pressure ratio that can be achieved in 2-stage T/C system can be obtained when the pressure distribution between the low-and high-pressure stages is the same. A low compression – high expansion cycle was applied to reduce the maximum combustion temper-ature by more than 200 K, and the 2-stage T/C was simultaneously applied to increase the scavenge air pressure by approximately 4 bar and Pmax by approximately 30 bar. The theoretical review confirmed that the application of the 2-stage T/C and the effect of low compression – high expansion, which is the Miller cycle, can be achieved for a marine 2-stroke engine.
참고문헌 (11)
- G. Gonca, "Theoretical and experimental investigation of the Miller cycle diesel engine in terms of performance and emission parameters", Applied Energy, 138, pp.11~20 (2015)
- G. Gonca, "Application of the Miller cycle and turbo charging into a diesel engine to improve performance and decrease NO emissions", Energy, 93(part 1), pp.795~800 (2015)
- 이지웅, "밀러사이클의 선박용 저속 2행정 기관에의 적용", 한국마린엔지니어링학회지, 41(6), pp.523~528 (2017), 한국마린엔지니어링학회[DOI]
- 이지웅, "선박용 저속 2행정기관의 밀러사이클 효과의 향상", 한국마린엔지니어링학회지, 41(9), pp.793~800 (2017), 한국마린엔지니어링학회[DOI]
- U. Kesgin, "Efficiency improvement and NOx emission re-duction potentials of two-stage turbocharged Miller cycle for stationary natural gas engines", International Journal of Energy Research, 29(3), pp.189~216 (2005)
- G. Gonca, "Performance maps for an air-standard irreversible Dual–Miller cycle(DMC)with late inlet valve closing(LIVC)version", Energy, 54, pp.285~290 (2013)
- G. Gonca, "Comprehensive per-formance analyses and optimization of the irreversible ther-modynamic cycle engines(TCE)under maximum power(MP)and maximum power density(MPD)conditions", Ap-plied Thermal Engineering, 85, pp.9~20 (2015)
- J. -W. Lee, "A Study on Application of Miller Cycle for Ma-rine Two-stroke Diesel Engine", Ph. D., pp.2018
- M. Mohammadi, "Accurate prediction of NOx emissions from diesel engines considering in-cylinder ion current", Environmental Pollution, 266(part 2) (2020)
- I. S. Anufriev, "Review of water", steam addition in liquid-fuel combustion systems for NOx reduction : Waste-to-en-ergy trends, 2021, pp.138, ~
- A. Fayyazbakhsh, "Comprehensive over-view on diesel additives to reduce emissions, enhance fuel properties and improve engine performance", Renewable and Sustainable Energy Reviews, 74, pp.891~901 (2017)