EXPERIMENTAL AND NUMERICAL STUDY OF INTERNAL FLOW AND SPRAY CHARACTERISTICS FOR ELLIPTICAL ORIFICE UNDER TYPICAL DIESEL ENGINE OPERATION CONDITIONS

2018 ◽  
Vol 28 (8) ◽  
pp. 713-733
Author(s):  
Shenghao Yu ◽  
Bifeng Yin ◽  
Weixin Deng ◽  
Hekun Jia ◽  
Ze Ye ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Numerical Study ◽  
Internal Flow ◽  
Spray Characteristics ◽  
Engine Operation ◽  
Operation Conditions

Internal flow and spray characteristics for elliptical orifice with large aspect ratio under typical diesel engine operation conditions

Fuel ◽  
2018 ◽  
Vol 228 ◽  
pp. 62-73 ◽  
Author(s):  
Shenghao Yu ◽  
Bifeng Yin ◽  
Weixin Deng ◽  
Hekun Jia ◽  
Ze Ye ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Aspect Ratio ◽  
Internal Flow ◽  
Large Aspect Ratio ◽  
Spray Characteristics ◽  
Engine Operation ◽  
Operation Conditions

Experimental study on the diesel and biodiesel spray characteristics emerging from equilateral triangular orifice under real diesel engine operation conditions

Fuel ◽  
2018 ◽  
Vol 224 ◽  
pp. 357-365 ◽  
Author(s):  
Shenghao Yu ◽  
Bifeng Yin ◽  
Weixin Deng ◽  
Hekun Jia ◽  
Ze Ye ◽  
...  
Keyword(s):  
Experimental Study ◽  
Diesel Engine ◽  
Spray Characteristics ◽  
Engine Operation ◽  
Operation Conditions

Estimation of the Occurrence of Micro-Explosion for the Diesel-Biofuel Multi-Components Droplets

2012 ◽  
Author(s):  
Cai Shen ◽  
Chia-fon F. Lee ◽  
Way L. Cheng
Keyword(s):  
Surface Energy ◽  
Minimal Surface ◽  
Weber Number ◽  
Numerical Study ◽  
Engine Operation ◽  
Fuel Droplets ◽  
Fuel Blends ◽  
Operation Conditions ◽  
Simulation Results ◽  
Breakup Model

A numerical study of micro-explosion in multi-component bio-fuel droplets is presented. The onset of micro-explosion is characterized by the normalized onset radius (NOR). Bubble expansion is described by a modified Rayleigh equation. The final breakup is modeled from a surface energy approach by determining the minimal surface energy (MSE). After the breakup, the Sauter mean radius (SMR) for initially small size droplets can be estimated from a look-up table generated from the current breakup model. There exists an optimal droplet size for the onset of micro-explosion. The MSE approach reaches the same conclusion as previous model determining atomization by aerodynamic disturbances. The SMR of secondary droplets can be estimated by the possible void fraction, ε, at breakup and the corresponding surface Weber number, Wes, at the minimal surface energy ratio (MSER). Biodiesel can enhance micro-explosion in the fuel blends of ethanol and diesel (which is represented by a single composition tetradecane). The simulation results show that the secondary atomization of bio-fuel and diesel blends can be achieved by micro-explosion under typical diesel engine operation conditions.

Engine Performance and Emissions Formation for RME and Conventional Diesel Oil: A Comparative Study

2009 ◽  
Author(s):  
Junfeng Yang ◽  
Monica Johansson ◽  
Valeri Golovitchev
Keyword(s):  
Diesel Engine ◽  
Comparative Study ◽  
Soot Formation ◽  
Engine Performance ◽  
Oxidation Mechanism ◽  
Diesel Oil ◽  
Engine Operation ◽  
Operation Conditions ◽  
Performance And Emissions ◽  
Engine Performance And Emissions

A comparative study on engine performance and emissions (NOx, soot) formation has been carried out for the Volvo D12C diesel engine fueled by Rapeseed Methyl Ester, RME and conventional diesel oil. The combustion models, used in this paper, are the modifications of those described in [1–2]. After the compilation of liquid properties of RME specified as methyl oleate, C19H36O2, making up 60% of RME. The oxidation mechanism has been compiled based on methyl butanoate ester, mb, C5H10O2 oxidation model [3] supplemented by the sub-mechanisms for two proposed fuel constituent components, methyl decanoate, md, C11H22O2, n-heptane, C7H16, and soot and NOx formations reduced and “tuned” by using the sensitivity analysis. A special global reaction was introduced to “crack” the main fuel into constituent components, md, mb and propyne, C3H4, to reproduce accurately the proposed RME chemical formula. The sub-mechanisms were collected in the general one consisting of 99 species participating in 411 reactions. The combustion mechanism was validated using shock-tube ignition-delay data at diesel engine conditions and flame propagation speeds at atmospheric conditions. The engine simulations were carried out for Volvo D12C engine fueled both RME and conventional diesel oil. The numerical results illustrate that in the case of RME, nearly 100% combustion efficiency was predicted when the cumulative heat release, was compared with the RME LHV, 37.2 kJ/g.. To minimize NOx emissions, the effects of 20–30% EGR levels depending on the engine loads and different injection strategies were analyses. To confirm the optimal engine operation conditions, a special technique based on the time-transient parametric φ-T maps [4] has been used.

1305 Internal Flow of Nozzles for Large Marine Diesel Engine and Spray Characteristics on Individual Holes

2016 ◽  
Vol 2016.54 (0) ◽  
pp. _1305-1_-_1305-2_
Author(s):  
Kousuke NAKAMURA ◽  
Kouki ISHIDA ◽  
Syuhei SUGATA ◽  
Daiki IUCHI ◽  
Sumito YOKOBE ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Internal Flow ◽  
Marine Diesel Engine ◽  
Spray Characteristics ◽  
Marine Diesel

scholarly journals Diesel Engine Optimization for Electric Hybrid Vehicles

2009 ◽  
Vol 131 (1) ◽  
Author(s):  
Talal F. Yusaf
Keyword(s):  
Diesel Engine ◽  
Maximum Temperature ◽  
Exhaust Emission ◽  
Oxides Of Nitrogen ◽  
Engine Operation ◽  
Performance And Emission ◽  
Operation Conditions ◽  
Lubricant Oil ◽  
Emission Testing ◽  
Engine Life

Performance and emission testing for a single cylinder four-stroke diesel engine have been experimentally performed to determine the optimum operation conditions for this engine when it is used as a hybrid power unit. The studied operation parameters included brake specific fuel consumption (BSFC), exhaust emission (NOx, CO, CO2, and O2), and engine life. The results indicate that the lowest BSFC of the engine was found when the engine runs around 1 kW charging load at speed ranged between 1900 rpm and 2700 rpm. As the speed of the engine is maintained constant, the minimum level of BSFC is below 300 g/kW h at around 1900 rpm. The best engine operation conditions, for low emission, are found at engine speed around 2500 rpm. It was found that the oxides of nitrogen remain within the acceptable level (below 180 ppm) for such a diesel engine. The battery charge has been conducted at constant speeds, where the lubricant oil temperature was constant and always below maximum temperature; this is a good indication for longer engine life.

DIESEL ENGINE OPERATION IN USE OF FUEL WITH ADDITIVES

2018 ◽  
pp. 18-24
Author(s):  
Petar Kazakov ◽  
Atanas Iliev ◽  
Emil Marinov
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Diesel Fuel ◽  
Internal Combustion Engines ◽  
Experimental Studies ◽  
Combustion Engines ◽  
Engine Operation ◽  
Factors Affecting ◽  
Operating Modes ◽  
Positive Effects

Over the decades, more attention has been paid to emissions from the means of transport and the use of different fuels and combustion fuels for the operation of internal combustion engines than on fuel consumption. This, in turn, enables research into products that are said to reduce fuel consumption. The report summarizes four studies of fuel-related innovation products. The studies covered by this report are conducted with diesel fuel and usually contain diesel fuel and three additives for it. Manufacturers of additives are based on already existing studies showing a 10-30% reduction in fuel consumption. Comparative experimental studies related to the use of commercially available diesel fuel with and without the use of additives have been performed in laboratory conditions. The studies were carried out on a stationary diesel engine СМД-17КН equipped with brake КИ1368В. Repeated results were recorded, but they did not confirm the significant positive effect of additives on specific fuel consumption. In some cases, the factors affecting errors in this type of research on the effectiveness of fuel additives for commercial purposes are considered. The reasons for the positive effects of such use of additives in certain engine operating modes are also clarified.

SPRAY CHARACTERISTICS IN A DIRECT-INJECTION DIESEL ENGINE

1996 ◽  
Vol 6 (1) ◽  
pp. 95-109 ◽  
Author(s):  
H. C. Yang ◽  
Hong Sun Ryou ◽  
Y. T. Jeong ◽  
Young Ki Choi
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Spray Characteristics ◽  
Direct Injection Diesel Engine
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