Thermo-Elastohydrodynamic Connecting Rod Simulation of a Four Stroke Medium Speed Engine

In the present study, nonreacting and nonevaporating spray characteristics of heavy fuel oil (HFO)/n-butanol blends are numerically investigated under two different high pressure injections in medium speed engines. An Eulerian-Lagrangian multiphase scheme is used to simulate blend of C14H30as HFO and 0%, 10%, 15%, and 20% by volume of n-butanol. OpenFOAM CFD toolbox is modified and implemented to study the effect of different blends of HFO/n-butanol on the spray characteristics at 600 and 1000 bar. To validate the presented simulations, current numerical results are compared against existing experimental data and good compliance is achieved. Based on the numerical findings, addition of n-butanol to HFO increases the particles volume in parcels at 600 bar. It was also found that blend fuels increase the number of spray particles and the average velocity of spray compared to pure HFO. Moreover, under injection pressure of 1000 bar, HFO/n-butanol blends compared to pure HFO fuel decrease particles volume in parcels of spray. Another influence of HFO/n-butanol blends is the decrease in average of particles diameter in parcels. Meanwhile, the effect of HFO/n-butanol on spray length is proved to be negligible. Finally, it can be concluded that higher injection pressure improves the spray efficiency.

Download Full-text

Analysing Applicability Of Selected Methods To Smooth Indicator Diagrams Of Marine Medium-Speed Engine

Polish Maritime Research ◽

10.1515/pomr-2015-0017 ◽

2015 ◽

Vol 22 (2) ◽

pp. 55-61 ◽

Cited By ~ 3

Author(s):

Rafał Pawletko

Keyword(s):

Moving Average ◽

Diagnostic Information ◽

Pressure Curve ◽

Filtration Method ◽

Smoothing Methods ◽

Medium Speed ◽

Curve Smoothing ◽

Medium Speed Engine ◽

Marine Medium ◽

Speed Engine

Abstract The article analyses the applicability of selected smoothing methods to smooth indicator diagram curves and to filter disturbances. An intermediate goal of the study was an attempt to extract disturbances recorded during pressure curve smoothing, which are believed to be a source of important diagnostic information. Within the framework of the reported analysis, a comparison was made between the moving average method, the Savitzky-Golay filter, and the frequency filtration method. The research was performed on a marine medium-speed engine Sulzer 3Al 25/30, which has a relatively long indicator passage.

Download Full-text

Benefits of Applying Digital Governors for Slow-To-Medium-Speed Engine Control

10.4271/880808 ◽

1988 ◽

Author(s):

David J. Fredlake ◽

Robert A. Black

Keyword(s):

Engine Control ◽

Medium Speed ◽

Medium Speed Engine ◽

Speed Engine

Download Full-text

Medium Speed Engine Crankshaft Analysis

Rakenteiden Mekaniikka ◽

10.23998/rm.64916 ◽

2017 ◽

Vol 50 (3) ◽

pp. 341-344 ◽

Cited By ~ 2

Author(s):

Ilkka Väisänen ◽

Antti Mäntylä ◽

Antti Korpela ◽

Teemu Kuivaniemi ◽

Tero Frondelius

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Element Analysis ◽

Medium Speed ◽

Body Dynamics ◽

Medium Speed Engine ◽

Multi Body ◽

Engine Crankshaft ◽

Speed Engine ◽

Bearing Analysis

This article describes the overview of crankshaft analysis of a medium speed dieselengine. Crankshaft analysis includes static analysis, crankshaft dynamics, bearing analysis, gearanalysis, and stress & fatigue analysis, the latter being in main focus in this article. AVL ExcitePower unit is used for multi-body dynamics and Abaqus for ﬁnite element analysis.

Download Full-text

Performance and Emissions of a Medium-Speed Engine Driven with Sustainable Options of Liquid Fuels

10.4271/2020-01-2126 ◽

2020 ◽

Author(s):

Seppo Niemi ◽

Michaela Hissa ◽

Teemu Ovaska ◽

Katriina Sirviö ◽

Sonja Heikkilä ◽

...

Keyword(s):

Liquid Fuels ◽

Medium Speed ◽

Performance And Emissions ◽

Medium Speed Engine ◽

Speed Engine

Download Full-text

Medium-Speed Engine Bearings—Development Experience

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.2906234 ◽

1991 ◽

Vol 113 (3) ◽

pp. 331-339 ◽

Cited By ~ 2

Author(s):

J. F. Warriner ◽

D. L. Westerling

Keyword(s):

Rapid Rise ◽

Field Service ◽

Medium Speed ◽

Lining Material ◽

Development Experience ◽

Medium Speed Engine ◽

History Of ◽

Modified Surface ◽

Thin Walled ◽

Speed Engine

After a brief history of the introduction of galvanically applied overlays to the surface of thin-walled half-bearings, the paper goes on to describe experiences in service engines. This shows that from the mid-1970s, overlay life could be sharply reduced due to a variety (or combination) of factors. These are described, the possible causes explained, and various palliatives investigated. The principle factor in the mid-1970s was the rapid rise in the use of lower quality heavy fuels initiated by escalating oil costs. The consequence of using these fuels was often rapid overlay loss, which in turn resulted in further problems, particularly: large areas of exposed nickel interlay, corrosion of the overlay, and/or corrosion of the base lining material. Four palliatives, elimination of the overlay, harder overlays, elimination of the interlayer, and modified surface topography are described and results of development testing and field service experience are presented.

Download Full-text

The new MAN 175D high‑speed engine – synthesis of commercial and medium‑speed engine development

Heavy-Duty-, On- und Off-Highway-Motoren 2017 - Proceedings ◽

10.1007/978-3-658-21029-8_9 ◽

2018 ◽

pp. 151-164

Author(s):

Christian Braun ◽

Alexander Rieß ◽

Peter Böhm ◽

Hauke Lund ◽

Klaus Eder

Keyword(s):

High Speed ◽

High Speed Engine ◽

New Man ◽

Medium Speed ◽

Medium Speed Engine ◽

Engine Development ◽

Speed Engine

Download Full-text

Research the Possibility of Obtaining Diagnostic Information about the Ships Engine Fuel Injection System Condition based on the Analysis of Characteristics of Heat Release

Journal of KONES ◽

10.2478/kones-2019-0080 ◽

2019 ◽

Vol 26 (3) ◽

pp. 249-256

Author(s):

Kazimierz Witkowski

Keyword(s):

Heat Release ◽

Fuel Injection ◽

Injection System ◽

Engine Fuel ◽

Medium Speed ◽

Marine Engines ◽

Marine Diesel ◽

Medium Speed Engine ◽

Marine Medium ◽

Speed Engine

Abstract Marine engines are very complex technical objects, having many important functional systems, which include, inter alia, injection system, characterized by high unreliability. In this system, there may be different types of defects (damage) that affect the engine parameters, including specific fuel consumption, as well as failures endanger the safety of the ship. The indicator diagrams and analysis of indicated parameters have limited utility in the diagnosis of damages of marine engine, although this is a method commonly used in operational practice. To achieve greater diagnostic effectiveness, when, based on indicator diagrams, are calculated and then the characteristics of heat release is analysed - net of heat release characteristics and the intensity of the heat release, it was demonstrated. This procedure is particularly effective in the diagnosis of damages of marine diesel engine injection system components. It has been shown that the characteristics of heat release contain information about the condition of the injection systems, which enable to diagnose their failures. This is shown on the example of a clogged nozzle holes (their carbonizations). The obtained results allowed selecting the diagnosis symptoms, useful in detecting these faults in the injection system, from the characteristics of heat release: net heat release (Q) and intensity of heat release (q). The object of the research was typical marine medium speed engine Sulzer A25/30.

Download Full-text