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논문 기본 정보

자료유형
학술대회자료
저자정보
Jaehyun Han (KAIST) Michael Vincent Jensen (Technical University of Denmark) Kar Mun Pang (Technical University of Denmark) Jens Honore Walther (Technical University of Denmark) Jesper Schramm (Technical University of Denmark) Choongsik Bae (KAIST)
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2017년도 학술대회
발행연도
2017.11
수록면
1,475 - 1,480 (6page)

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초록· 키워드

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The methane slip is the problematic issue for the engines using natural gas(NG). Because methane is more powerful greenhouse gas (GHG) than CO₂, understanding of the methane slip during gas exchange process of the engines is essential. In this study, the influence of the gas pipe geometry and the valve timings on the methane slip was investigated. MAN L28/32DF engine was modeled to simulate the gas exchange process of the four stroke NG-diesel dual fuel engines. The mesh size of the model was decided based on the sensitivity study on the peak pressure of the cylinder and the fuel mass estimations. The simulations with various gas pipe geometries were conducted. It seemed that the effect of the change in injection direction is more dominant than the change in the gas hole configuration. The favorable injection direction for minimum amount of methane slip was discovered as the direction which helps developing the flow of methane far from the exhaust ports. The effects of various valve tuning settings were also simulated. The advancement of the exhaust valve closing was more efficient than the retardation of the intake valve opening. A little retardation of the intake valve opening even resulted in the increase of the amount of methane slip.

목차

Abstract
1. Introduction
2. Specification of engine and boundary conditions
3. CFD modelling procedure
4. Simulation conditions and results
5. Conclusion
References

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