scholarly journals A Numerical Study of Spray Characteristics in Medium Speed Engine Fueled by Different HFO/n-Butanol Blends

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Hashem Nowruzi ◽  
Parviz Ghadimi ◽  
Mehdi Yousefifard
Keyword(s):  
Average Velocity ◽  
Numerical Study ◽  
Injection Pressure ◽  
Fuel Oil ◽  
Heavy Fuel Oil ◽  
Spray Characteristics ◽  
Good Compliance ◽  
Medium Speed ◽  
Medium Speed Engine ◽  
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.

Careful Parameter Study to Enhance the Effect of Injecting Heavy Fuel Oil Into a Crossflow Using Numerical Approaches

2018 ◽  
Author(s):  
Masoud Darbandi ◽  
Ali Fatin ◽  
Gerry E. Schneider
Keyword(s):  
Flow Velocity ◽  
Cross Flow ◽  
Droplet Breakup ◽  
Computational Method ◽  
Fuel Oil ◽  
Injection Velocity ◽  
Parameter Study ◽  
Spray Parameters ◽  
Heavy Fuel Oil ◽  
Spray Characteristics

The flow and spray parameters can have noticeable roles in heavy fuel oil (HFO) spray finesse. As known, the interaction between droplets and cross flow should be considered carefully in many different industrial applications such as the process burners and gas turbine combustors. So, it would be so important to investigate the effect of injecting HFO into a crossflow more subtly. In this work, the effects of various flow and spray parameters on the droplet breakup and dispersion parameters are investigated numerically using the finite-volume-element method. The numerical method consists of a number of different models to predict the droplets breakup and their dispersion into a cross flow including the spray-turbulence interaction one. An Eulerian–Lagrangian approach, which suitably models the interaction between the droplets and turbulence, and also models the droplets secondary breakup is used to investigate the interactions between the flow and the droplet behaviors. After validating the computational method via comparing them with the data provided by the past researches, four test cases with varying swirl number, air axial velocity, droplet size, and fuel injection velocity are examined to find out the effects of preceding parameters on some spray characteristics including the droplets path, sauter mean diameter (SMD), and dispersed phase mass concentration. The results show that the droplets inertia and the flow velocity magnitude have significant effects on spray characteristics. As the droplets become more massive, the deflection of spray in flow direction becomes less. Also, increasing of flow velocity causes more deflection for sprays with the same droplet sizes.

Ultra-low Emission Medium Speed Engine for EU Stage V

MTZ worldwide ◽  
2021 ◽  
Vol 82 (11) ◽  
pp. 46-53
Author(s):  
Daniel Peitz ◽  
Dominik Gschwend ◽  
Koen Christianen ◽  
Kati Lehtoranta
Keyword(s):  
Medium Speed ◽  
Low Emission ◽  
Medium Speed Engine ◽  
Speed Engine

A Study on the Applicability of Straight Vegetable Oils to Medium Speed Diesel Engines

2009 ◽  
Author(s):  
Hyoung-Keun Park ◽  
Sang-Hak Ghal ◽  
Tae-Hyung Park ◽  
Yong-Hee Ahn ◽  
Sung-Hyeok Kim
Keyword(s):  
Vegetable Oil ◽  
Diesel Engines ◽  
Short Interval ◽  
Injection Pressure ◽  
Acid Number ◽  
Fuel Oil ◽  
Oil Consumption ◽  
Total Acid ◽  
Medium Speed ◽  
Marine Diesel

Straight vegetable oil (SVO) fuels such as palm oil, animal fat oil and waste vegetable oil were tested as fuels in a single-cylinder diesel engine to evaluate applicability to medium-speed diesel engines. Fuel-related properties of the SVO were assessed and compared with conventional marine diesel fuel oil (MDO). The total acid number (TAN) of the SVO fuels changed during a short interval in a drying oven which heated the SVO fuels to 170 degrees Celsius for several weeks. The SVO have not gone rancid any further after reaching limit. And the TAN of the SVO fuels was not related to corrosion of the parts. The SVO fuels needed to be heated to an appropriate temperature to use as fuel of the engine since the SVO fuels are more viscous than conventional diesel fuels. Both the injection period and the injection pressure increased due to low heating values of the SVO fuels. By the same token, fuel oil consumption increased over 10%. The overall exhaust emissions were lower with the SVO fuels, but NOx emission was as much as MDO at the higher loads.

Investigating SO3 Formation from the Combustion of Heavy Fuel Oil in a Four-Stroke Medium-Speed Test Engine

2013 ◽  
Vol 27 (10) ◽  
pp. 6279-6286 ◽  
Author(s):  
Rasmus Cordtz ◽  
Jesper Schramm ◽  
Rom Rabe
Keyword(s):  
Fuel Oil ◽  
Heavy Fuel Oil ◽  
Speed Test ◽  
Medium Speed ◽  
Test Engine

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

2015 ◽  
Vol 22 (2) ◽  
pp. 55-61 ◽  
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.

scholarly journals Influence of the Fuel Properties on the Injection Process and Spray Development in a large ship diesel Engine

2017 ◽  
Author(s):  
Ibrahim Najar ◽  
Bert Buchholz ◽  
Benjamin Stengel ◽  
Christian Fink ◽  
Egon Hassel
Keyword(s):  
Diesel Engine ◽  
Cone Angle ◽  
Fuel Properties ◽  
Fuel Oil ◽  
Injection System ◽  
Heavy Fuel Oil ◽  
Common Rail Injection System ◽  
Injection Process ◽  
Medium Speed ◽  
Common Rail Injection

The present paper deals with the influence of fuel properties on the spray behaviour. This influence was studiedexperimentally using a common rail injection system from a medium speed diesel engine. The experiments have been performed with diesel fuel (EN-590) and heavy fuel oil (RMG 180) on a constant volume chamber at room temperature. Comparison of the spray characteristics shows that the heavy fuel oil penetrates deeper in the chamber. However, the diesel spray has a bigger cone angle. These results formed the basis for a further development of the 1D-model [1] to predict the spray penetration by considering the fuel properties and temperature.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4787

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