An Investigation on the Diffusion of Momentum and Mass of Fuel in a Diesel Fuel Spray

1977 ◽  
Vol 99 (2) ◽  
pp. 225-235 ◽  
Author(s):  
C. M. Vara Prasad ◽  
Subir Kar
Keyword(s):  
Diesel Fuel ◽  
Injection Pressure ◽  
Ambient Air ◽  
Fuel Spray ◽  
Modified Model ◽  
Free Jet ◽  
Normal Probability ◽  
Proposed Model ◽  
Normal Probability Distribution ◽  
Good Agreement

An investigation on the diesel fuel spray injected into stagnant ambient air in a chamber is reported in this paper. The objective of the investigation was to analyze the processes of diffusion of mass and velocity of the fuel in the fuel spray. The distribution of velocity and mass of the fuel showed similarity in the zone of established flow. Gaussian normal probability distribution for free jet was assumed by earlier workers, starting with Albertson, et al., for analyzing such a situation. However, it has been found that diesel fuel spray in a chamber necessitates modification of the model described and a modified model has been proposed herein. The Abramovich model is also compared with the experimental data. The ratio of εm/εm0 varied from 1.24 to 1.45 for the change of injection pressure from 100 to 200 atm. It is conclusively shown that mass diffuses faster than the momentum, the rate of diffusion increasing with the increase in the injection pressure. The proposed model gives good agreement with experimental results. The various parameters of the equations for depicting the fuel spray as a jet have been evaluated and tabulated.

Characterizing Diesel Fuel Spray Cone Angle From Back-Scattered Imaging by Fitting Gaussian Profiles to Radial Spray Intensity Distributions

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Jaclyn E. Johnson ◽  
Jeffrey D. Naber ◽  
Seong-Young Lee
Keyword(s):  
Charge Density ◽  
Diesel Fuel ◽  
Curve Fitting ◽  
Cone Angle ◽  
Injection Pressure ◽  
Fuel Spray ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Gaussian Curve

Quantifying fuel spray properties including penetration, cone angle, and vaporization processes sheds light on fuel-air mixing phenomenon, which governs subsequent combustion and emissions formation in diesel engines. Accurate experimental determination of these spray properties is a challenge but imperative to validate computational fluid dynamic (CFD) models for combustion prediction. This study proposes a new threshold independent method for determination of spray cone angle when using Mie back-scattering optical diagnostics to visualize diesel sprays in an optically accessible constant volume vessel. Test conditions include the influence of charge density (17.6 and 34.9 kg/m3) at 1990 bar injection pressure, and the influence of injection pressure (990, 1370, and 1980 bar) at a charge density of 34.8 kg/m3 on diesel fuel spray formation from a multi-hole injector into nitrogen at a temperature of 100 °C. Conventional thresholding to convert an image to black and white for processing and determination of cone angle is threshold subjective. As an alternative, an image processing method was developed, which fits a Gaussian curve to the intensity distribution of the spray at radial spray cross-sections and uses the resulting parameters to define the spray edge and hence cone angle. This Gaussian curve fitting methodology is shown to provide a robust method for cone angle determination, accounting for reductions in intensity at the radial spray edge. Results are presented for non-vaporizing sprays using this Gaussian curve fitting method and compared to the conventional thresholding based method.

CHANGES IN THE AREA BRIGHTNESS OF DIESEL FUEL SPRAY ZONES

2016 ◽  
Vol 3 (1) ◽  
pp. 506-509
Author(s):  
Кулманаков ◽  
S. Kulmanakov ◽  
Кирюшин ◽  
I. Kiryushin
Keyword(s):  
Diesel Fuel ◽  
Liquid Fuel ◽  
Pressure Range ◽  
Injection Pressure ◽  
Fuel Spray ◽  
Experimental Setup ◽  
Jet Injection ◽  
Axial Section ◽  
Fuel Jet ◽  
Fuel Stream

The article contains a description of the experimental setup and the stent-speed video atomized fuel stream, applicable for the study of the jet sputtering process liquid fuel. In axial section shows information about the dynamics of the area of the normalized luminance zones in the diesel fuel jet injection pressure range of 60 MPa to 180 MPa

Effects of Fuel Injection Pressure on Spray Characteristics and Vaporization Characteristics of Diesel Fuel Spray

2016 ◽  
Vol 2016 (0) ◽  
pp. G0700102
Author(s):  
Shun SHIMOTSUMAGARI ◽  
Takeru IWAMOTO ◽  
Masaoki SUGIHARA ◽  
Hideki HASHIMOTO ◽  
Osamu MORIUE
Keyword(s):  
Diesel Fuel ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Fuel Spray ◽  
Spray Characteristics ◽  
Fuel Injection Pressure

scholarly journals RESEARCH ON THE PROCESS OF BIOFUEL INJECTION / BIODEGALŲ IŠPURŠKIMO PROCESO TYRIMAS

2012 ◽  
Vol 4 (4) ◽  
pp. 381-385
Author(s):  
Birutė Skukauskaitė ◽  
Tomas Mickevičius
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Diesel Fuel ◽  
Rapeseed Oil ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Fuel Spray ◽  
Chamber Volume ◽  
Air Density ◽  
Engine Combustion

The purpose of this research was to examine penetration peculiarities of rapeseed oil injected into the combustion chamber of a diesel engine. For conducting tests, a stand imitating conditions (air density) for the engine combustion chamber was designed. The analysis of pictures obtained using a fast recording camera determined fuel injection into the chamber volume and calculated the velocity of spray head. It was established that fuel spray of injected rapeseed oil proceeds deeper into the combustion chamber than that of mineral diesel fuel. The parameters of fuel spray are mainly influenced by injection pressure rather than by the density of compressed gases. Santrauka Šio darbo tikslas buvo ištirti į dyzelinio variklio degimo kamerą įpurškiamos rapsų aliejaus čiurkšlės kitimo ypatumus, lyginant su mineraliniu dyzelinu. Tyrimams sukonstruotas stendas, kuriame buvo imituojamos sąlygos (oro tankis), esančios variklio degimo kameroje. Analizuojant spartaus filmavimo vaizdo kamera gautus vaizdus, buvo išmatuotas degalų čiurkšlės įsiskverbimo į degimo kamerą dydis, apskaičiuotas čiurkšlės fronto judėjimo greitis. Nustatyta, kad įpurškiamo rapsų aliejaus čiurkšlė į degimo kamerą įsiskverbia giliau, negu mineralinio dyzelino čiurkšlė. Įpurškiamų degalų čiurkšlės parametrams didesnės įtakos turi įpurškimo slėgis nei aplinkos dujų tankis.

scholarly journals The Differential Impact of Various Injection Pressures on the Exergy of a Diesel Engine Using Biodiesel-Diesel Fuel Blends

2021 ◽  
Vol 14 (1) ◽  
pp. 345
Author(s):  
Mostafa Kiani Deh Kiani ◽  
Sajad Rostami ◽  
Gholamhassan Najafi ◽  
Mohamed Mazlan
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Diesel Fuel ◽  
Exergy Analysis ◽  
Direct Injection ◽  
Injection Pressure ◽  
Cylinder Pressure ◽  
Fuel Blends ◽  
Lack Of Information ◽  
Good Agreement

Contrary to energy, exergy may be destroyed due to irreversibility. Exergy analysis can be used to reveal the location, and amount of energy losses of engines. Despite the importance of the exergy analysis, there is a lack of information in this area, especially when the engine is fueled with biodiesel–diesel fuel blends under various injection operating parameters. Thus, in this research, the exergy analysis of a direct-injection diesel engine using biodiesel–diesel fuel blends was performed. The fuel blends (B0, B20, B40, and B100) were injected into cylinders at pressures of 200 and 215 bars. Moreover, the simulation of exergy and energy analyses was done by homemade code. The simulation model was verified by compression of experimental and simulation in-cylinder pressure data. The results showed there was good agreement between simulation data and experimental ones. Results indicated that the highest level of in-cylinder pressure at injection pressure of 215 bars is more than that of 200 bars. Moreover, by increasing the percentage of biodiesel, the heat transfer exergy, irreversibility, burnt fuel, and exergy indicator decreased, but the ratio of these exergy parameters (except for heat transfer exergy) to fuel exergy increased. These ratios increased from 46 to 50.54% for work transfer exergy, 16.57 to 17.97% for irreversibility, and decreased from 16 to 15.49% for heat transfer exergy. In addition, these ratios at 215 bars are higher than at 200 bars for all fuels. However, with increasing the injection pressure and biodiesel concentration in fuel blends, the exergy and energy efficiencies increased.

scholarly journals Spray Structure in Diesel Fuel Spray with High Injection Pressure.

1996 ◽  
Vol 62 (597) ◽  
pp. 2079-2085 ◽  
Author(s):  
Tomohisa DAN ◽  
Sayo TAKAGISHI ◽  
Naoki OHISHI ◽  
Jiro SENDA ◽  
Hajime FUJIMOTO
Keyword(s):  
Diesel Fuel ◽  
Injection Pressure ◽  
Fuel Spray ◽  
Spray Structure ◽  
High Injection ◽  
High Injection Pressure

scholarly journals Image Measurement of Diesel Fuel Spray at High Injection Pressure

1999 ◽  
Vol 19 (Supplement1) ◽  
pp. 229-232
Author(s):  
Zhao Min CAO ◽  
Shigehiro MIZUNO ◽  
Koichi NISHINO ◽  
Kahoru TORII
Keyword(s):  
Diesel Fuel ◽  
Injection Pressure ◽  
Fuel Spray ◽  
Image Measurement ◽  
High Injection ◽  
High Injection Pressure

Characterizing Diesel Fuel Spray Cone Angle From Back-Scattered Imaging by Fitting Gaussian Profiles to Radial Spray Intensity Distributions

2011 ◽  
Author(s):  
Jaclyn E. Nesbitt ◽  
Jeffrey D. Naber ◽  
Seong-Young Lee
Keyword(s):  
Charge Density ◽  
Diesel Fuel ◽  
Curve Fitting ◽  
Cone Angle ◽  
Injection Pressure ◽  
Fuel Spray ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Gaussian Curve

Quantifying fuel spray properties including penetration, cone angle, and vaporization processes sheds light on fuel-air mixing phenomenon which governs subsequent combustion and emissions formation in diesel engines. Accurate experimental determination of these spray properties is a challenge but imperative to validate computational fluid dynamic (CFD) models for combustion prediction. This study proposes a new threshold independent method for determination of spray cone angle when using Mie back-scattering optical diagnostics to visualize diesel sprays in an optically accessible constant volume vessel. Test conditions include the influence of charge density (17.6 and 34.9 kg/m3) at 1990 bar injection pressure, and the influence of injection pressure (990, 1370, and 1980 bar) at a charge density of 34.8 kg/m3 on diesel fuel spray formation from a multi-hole injector into nitrogen at a temperature of 100°C. Conventional thresholding to convert an image to black and white for processing and determination of cone angle is threshold subjective. As an alternative, an image processing method was developed which fits a Gaussian curve to the intensity distribution of the spray at radial spray cross-sections and uses the resulting parameters to define the spray edge and hence cone angle. This Gaussian curve fitting methodology is shown to provide a robust method for cone angle determination, accounting for reductions in intensity at the radial spray edge. Results are presented for non-vaporizing sprays using this Gaussian curve fitting method and compared to the conventional thresholding based method.

The Parameter Dependence of the Coefficient in a Model for Constant-Pressure Steam Injection in Soil

1997 ◽  
Vol 07 (05) ◽  
pp. 593-612 ◽  
Author(s):  
Brian H. Gilding ◽  
Shuanhu Li
Keyword(s):  
Probability Distribution ◽  
Crucial Role ◽  
Constant Pressure ◽  
Steam Injection ◽  
Unknown Coefficient ◽  
Qualitative Properties ◽  
Normal Probability ◽  
Proposed Model ◽  
Pressure Steam ◽  
Normal Probability Distribution

In a recently proposed model for the injection of steam into an air-filled soil, an equation which defines an unknown coefficient in terms of the parameters in the model arises. The paper examines this equation. It is shown that the coefficient is well-defined. Furthermore, quantitative and qualitative properties of the dependence of the coefficient on the parameters in the model are derived. A crucial role in the analysis is played by the Mills ratio for the normal probability distribution. By the bye, bounds for the Mills ratio, which to the best of the authors' knowledge are new, are obtained.

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