Self-tuning Method of Electronic Governor Parameters for Marine Medium-speed Diesel Engine

2020 ◽  
Vol 103 (sp1) ◽  
pp. 378
Author(s):  
Chunxiang Xu ◽  
Haitao Xu
Keyword(s):  
Diesel Engine ◽  
Tuning Method ◽  
Medium Speed ◽  
Self Tuning ◽  
Marine Medium

Investigations of an air starting motor of marine medium-speed diesel engine with numerical analyses

2010 ◽  
Vol 19 (2) ◽  
pp. 148-153 ◽  
Author(s):  
Yeon Won Lee ◽  
Yoon Hwan Choi ◽  
Deog Hee Doh
Keyword(s):  
Diesel Engine ◽  
Numerical Analyses ◽  
Medium Speed ◽  
Marine Medium

scholarly journals Optimization of Marine Medium Speed Diesel Engine Performance based on Multi-Injector System

2021 ◽  
Vol 236 ◽  
pp. 01026
Author(s):  
Dai Liu ◽  
Yingzhu Guo ◽  
Long Liu ◽  
Qian Xia ◽  
Yong Gui
Keyword(s):  
Diesel Engine ◽  
Thermal Efficiency ◽  
Fuel Injection ◽  
Engine Performance ◽  
Injection Rate ◽  
Nox Emission ◽  
Spray Angle ◽  
Medium Speed ◽  
Injector System ◽  
Marine Medium

Multi-injector system is potential to improve thermal efficiency and NOx emission of diesel engine at the same time. In order to optimize the combustion and emission of Marine medium speed diesel engine, the engine combustion with a multi-injector system is simulated and analyzed by CFD software Converge. In this research, two injectors are installed at the side of the cylinder head while the central injector is maintained. Various injection directions of side injectors and injection strategies of multi-injector system are simulated to optimize the fuel spray and combustion. The analysis results show that the spray angle of the side injector plays a key role for effective thermal efficiency improvement, since complex spray jet-jet interaction and spray impingement may deteriorate the combustion if the arrangement of spray angle was not set properly. Once the fuel injection direction has been optimized, the fuel ratio of the three injectors is optimized and improved the effective thermal efficiency with lower NOx emission. The results show that the two side injectors could increase the fuel injection rate into the cylinder, leading to high brake power and consequently increased the thermal efficiency by 1.26% and decreased the NOx emission by 16% for the best optimization.

Optimization of a Marine Medium-Speed Engine With Multi-Injector System by 1D Predictive Simulation

2021 ◽  
Author(s):  
Dai Liu ◽  
Peng Zhang ◽  
Long Liu ◽  
Qian Xia ◽  
Xiuzhen Ma
Keyword(s):  
Diesel Engine ◽  
Thermal Efficiency ◽  
Engine Performance ◽  
Nox Emission ◽  
Combustion Model ◽  
Injection Timing ◽  
Engine Model ◽  
Medium Speed ◽  
Injector System ◽  
Marine Medium

Abstract The thermal efficiency and emission of large bore marine medium-speed diesel engine are required to be improved under the stringent legislations. A multi-injector system has been proposed in order to improve the thermal efficiency and NOx emission instantaneously. However, application of the multi-injector system increased the complexity of parameter optimization and control. To develop proper control strategy of the novel multi-injector system, a 1D engine model of the original engine configurations was developed initially, including a predictive combustion model in commercial 1D simulation program (GT-Power). After calibrated by test results and literature data under various engine loads, the engine model was modified from a central single injector engine to a multi-injector engine. On the basis of a conventional direct-injection diesel engine, another two injectors were added to the cylinder as side injectors in the model. And the fundamental combustion characteristics and engine performance of the marine medium-speed diesel engine with multi-injector are investigated under various injection quantity ratio between the central injector and side injectors. The effects of injection timing and split injection are also studied by simulation. The result indicated that the effective thermal efficiency and NOx emission of the medium speed marine diesel engine are optimized instantaneously by changing the injection strategies of the central and side injectors. Finally, the preferred injection strategy is proposed by the 1D model.

Self-Tuning Method of NOX Soft-Sensor for Diesel Engine to Realize NOX Control

2016 ◽  
Vol 2016 (0) ◽  
pp. 438
Author(s):  
Yuki HIRAKAWA ◽  
Shinichi ISIZUKA ◽  
Itsuro KAJIWARA ◽  
Junichi SATO ◽  
Yoshihumi HANAMURA
Keyword(s):  
Diesel Engine ◽  
Soft Sensor ◽  
Tuning Method ◽  
Self Tuning

scholarly journals Analysis of the Impact of Split Injection on Fuel Consumption and NOx Emissions of Marine Medium-Speed Diesel Engine

2020 ◽  
Vol 8 (10) ◽  
pp. 820
Author(s):  
Vladimir Pelić ◽  
Tomislav Mrakovčić ◽  
Radoslav Radonja ◽  
Marko Valčić
Keyword(s):  
Diesel Engine ◽  
Numerical Model ◽  
Fuel Consumption ◽  
Electric Propulsion ◽  
Nox Emissions ◽  
Split Injection ◽  
Propulsion Systems ◽  
Medium Speed ◽  
The Impact ◽  
Marine Medium

The medium-speed diesel engine in diesel-electric propulsion systems is increasingly used as the propulsion engine for liquefied natural gas (LNG) ships and passenger ships. The main advantage of such systems is high reliability, better maneuverability, greater ability to optimize and significant decreasing of the engine room volume. Marine propulsion systems are required to be as energy efficient as possible and to meet environmental protection standards. This paper analyzes the impact of split injection on fuel consumption and NOx emissions of marine medium-speed diesel engines. For the needs of the research, a zero-dimensional, two-zone numerical model of a diesel engine was developed. Model based on the extended Zeldovich mechanism was applied to predict NOx emissions. The validation of the numerical model was performed by comparing operating parameters of the basic engine with data from engine manufacturers and data from sea trials of a ship with diesel-electric propulsion. The applicability of the numerical model was confirmed by comparing the obtained values for pressure, temperature and fuel consumption. The operation of the engine that drives synchronous generator was simulated under stationary conditions for three operating points and nine injection schemes. The values obtained for fuel consumption and NOx emissions for different fuel injection schemes indicate the possibility of a significant reduction in NOx emissions but with a reduction in efficiency. The results showed that split injection with a smaller amount of pilot fuel injected and a smaller angle between the two injection allow a moderate reduction in NOx emissions without a significant reduction in efficiency. The application of split injection schemes that allow significant reductions in NOx emissions lead to a reduction in engine efficiency.

Sign in / Sign up

Export Citation Format

Share Document