Improved piston running in low-speed diesel engines

MTZ worldwide ◽  
2002 ◽  
Vol 63 (4) ◽  
pp. 24-26
Author(s):  
Matthias Amoser
Keyword(s):  
Diesel Engines ◽  
Low Speed

scholarly journals Modern marine low-speed diesel engines: state, prospects and problems

2020 ◽  
Vol 94 (1) ◽  
pp. 143-154
Author(s):  
Khudyakov S. A. ◽  
Ignatenko A.V.
Keyword(s):  
Diesel Engines ◽  
Low Speed

Scaling spray combustion processes in marine low-speed diesel engines

Fuel ◽  
2019 ◽  
Vol 258 ◽  
pp. 116133 ◽  
Author(s):  
Xinyi Zhou ◽  
Tie Li ◽  
Yijie Wei ◽  
Sichen Wu
Keyword(s):  
Diesel Engines ◽  
Spray Combustion ◽  
Low Speed ◽  
Combustion Processes

A Numerical Study of an Electrically Assisted Boosting System for Turbocharged Diesel Engines

2019 ◽  
Author(s):  
Yifan Men ◽  
Jason B. Martz ◽  
Eric Curtis ◽  
Guoming G. Zhu
Keyword(s):  
Fuel Economy ◽  
Diesel Engines ◽  
Numerical Study ◽  
Peak Torque ◽  
Engine Fuel ◽  
Engine Torque ◽  
Low Speed ◽  
Electrically Assisted ◽  
Torque Response ◽  
Variable Geometry Turbine

Abstract Modern diesel engines are normally turbocharged in order to achieve desired fuel economy and meet emission requirements. The well-known “turbo-lag”, delayed engine torque response to driver’s demand, is the main disadvantage for turbocharged engines operated under transient conditions. In addition, at low engine speed, the peak engine output torque is heavily limited by the available turbine energy. As a result, turbocharged engines have degraded peak torque at low speed and slow transient responses in general. Various technologies (variable geometry turbine, electrically assisted turbocharger, hydraulically assisted turbocharger, etc.) have been developed to improve transient response and low-speed torque performance. This paper presents a numerical study of an electrically assisted boosting (eBoost) system for a turbocharged diesel engine through 1-D simulations. This study focuses on two main areas: the electrical compensation at steady-state and turbo-lag reduction under transient operation. It is shown that the eBoost system is capable of increasing engine fuel economy at mid-speed and greatly improving low-speed peak torque. In addition, the eBoost system improves engine transient performance by reducing response time up to 60%.

Direct Water Injection to Improve Diesel Spray Combustion

2003 ◽  
Author(s):  
Koji Takasaki ◽  
Tatsuo Takaishi ◽  
Hiroyuki Ishida ◽  
Keijirou Tayama
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Fuel Injection ◽  
Nox Reduction ◽  
Water Injection ◽  
Injection Pressure ◽  
Injection System ◽  
Injection Hole ◽  
Low Speed ◽  
Direct Water Injection

Now, it is essential to apply some measures for NOx reduction to low-speed diesel engines emitting much more NOx than high-speed engines. At the same time PM emission must be reduced especially when bunker fuel or heavy fuel is burned. This paper describes the applications of SFWI (Stratified Fuel Water Injection) system and DWI (Direct Water Injection) system to large sized diesel engines to reduce NOx and PM emission. SFWI system makes it possible to inject water during fuel injection from the same nozzle hole without mixing the liquids. DWI system injects water with high injection pressure from the other injection hole than the fuel injection hole into the combustion chamber directly. For testing both the systems, a 2-stroke-cycle low-speed test engine was used.

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