Numerical Analysis of Swirl Chamber Combustion System in DI Diesel Engines with the Conical-Spray

2015 ◽  
Vol 752-753 ◽  
pp. 922-927
Author(s):  
Sheng Li Wei ◽  
Kun Peng Ji ◽  
Xian Yin Leng ◽  
Xuan Liu
Keyword(s):  
Diesel Engines ◽  
Direct Injection ◽  
Cone Angle ◽  
Combustion System ◽  
Combustion Chambers ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Swirl Chamber ◽  
Narrow Passage ◽  
Combustion Processes

In order to promote the quality of mixture and improve the fuel spray spatial distribution, enhancing airflow movement in a combustion chamber, a new swirl chamber combustion system in DI (direct injection) diesel engines is proposed based on conical-spray. Numerical simulations have been conducted by using the FIRE v2008 code. Several different widths of passage and spray angles are investigated in a single cylinder 135 diesel engine. The combustion and emissions performance were investigated by different conical-spray nozzles and combustion chambers with a constant compression ratio. The results show that using this combustion system, the mixture formation and combustion processes have been improved by a certain longitudinal swirl when the air is squished into the swirl chamber through the relative narrow passage. Moreover, the formation of homogeneous mixture is accelerated and the combustion is improved compared with that of conventional combustion system. The cases show the passage width of 5mm and conical spray cone angle of 140° has a better performance in the new combustion system.

Experimental Study on Diesel Engine and Analysis the Spray Characteristics of Diesel and Biodiesel by Varying Injection Pressure

2014 ◽  
Vol 984-985 ◽  
pp. 932-937 ◽  
Author(s):  
Palani Raghu ◽  
M. Senthamil Selvan ◽  
K. Pitchandi ◽  
N. Nallusamy
Keyword(s):  
Experimental Study ◽  
Diesel Engine ◽  
Weber Number ◽  
Direct Injection ◽  
Cone Angle ◽  
Injection Pressure ◽  
Injection Velocity ◽  
Spray Characteristics ◽  
Spray Cone Angle ◽  
Spray Cone

— The spray characteristic of the injected fuel is mainly depends upon fuel injection pressure, temperature, ambient pressure, fuel viscosity and fuel density. An experimental study was conducted to examine the effect of injection pressure on the spray was injected into direct injection (DI) diesel engine in the atmospheric condition. In Diesel engine, the window of 20 mm diameter hole and the transparent quartz glass materials were used for visualizing spray characteristics of combustion chamber at right angle triangle position. The varying Injection pressure of 180 - 240 bar and the engine was hand cranked for conducting the experiments. Spray characteristics for Jatropha oil methyl ester (JOME) and diesel were studied experimentally. Spray tip penetration and spray cone angle were measured in a combustion chamber of Direct Injection diesel engine by employing high speed Digital camera using Mie Scattering Technique and ImageJ software. The study shows the JOME gives longer spray tip penetration and smaller spray cone angle than those of diesel fuels. The Spray breakup region (Reynolds number, Weber number), Injection velocity and Sauter Mean Diameter (SMD) were determined for diesel and JOME. SMD decreases for JOME than diesel and the Injection velocity, Reynolds Number, Weber Number Increases for JOME than diesel.

Factors Influencing the Effective Spray Cone Angle of Pressure-Swirl Atomizers

1992 ◽  
Vol 114 (1) ◽  
pp. 97-103 ◽  
Author(s):  
S. K. Chen ◽  
A. H. Lefebvre ◽  
J. Rollbuhler
Keyword(s):  
Cone Angle ◽  
Injection Pressure ◽  
Diameter Ratio ◽  
Liquid Viscosity ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Swirl Chamber ◽  
Factors Influencing ◽  
Pressure Swirl ◽  
Discharge Orifice

The spray cone angles produced by several simplex pressure-swirl nozzles are examined using three liquids whose viscosities range from 0.001 to 0.012 kg/ms (1 to 12 cp). Measurements of both the visible spray cone angle and the effective spray cone angle are carried out over wide ranges of injection pressure and for five different values of the discharge orifice length/diameter ratio. The influence of the number of swirl chamber feed slots on spray cone angle is also examined. The results show that the spray cone angle widens with increase in injection pressure but is reduced by increases in liquid viscosity and/or discharge orifice length/diameter ratio. Variation in the number of swirl chamber feed slots between one and three has little effect on the effective spray cone angle.

Numerical simulation on effects of spray angle in a swirl chamber combustion system of DI (direct injection) diesel engines

Energy ◽  
2014 ◽  
Vol 75 ◽  
pp. 289-294 ◽  
Author(s):  
Shengli Wei ◽  
Kunpeng Ji ◽  
Xianyin Leng ◽  
Feihu Wang ◽  
Xin Liu
Keyword(s):  
Numerical Simulation ◽  
Diesel Engines ◽  
Direct Injection ◽  
Spray Angle ◽  
Combustion System ◽  
Swirl Chamber

scholarly journals Numerical Simulation on Effect of Spray Cone Angle on Emissions in Diesel-Engine using AVL-FIRE

2020 ◽  
Vol 9 (4) ◽  
pp. 1595-1599
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Cone Angle ◽  
Three Dimensional ◽  
Engine Performance ◽  
Spray Angle ◽  
Compression Ignition Engine ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Performance And Emission

The in-cylinder flow dramatically affects combustion performance and emission characteristics of a compression ignition engine. The spray cone angle is among the most critical factors affecting mixture formation, combustion and emissions in a direct injection diesel engine. We have used three-dimensional computational investigations on spray cone angle-induced emission pattern of V-type DI engine under AVL-FIRE and ESE simulation interface. Four spray cone angles of 120°, 130°, 140°, and 150° were used for simulation purpose. The findings from the three-dimensional AVL-FIRE simulation confirm the influence of spray angle on optimal air-fuel mixing and, hence, combustion. Spray cone angle of 140° gave better engine performance in terms of lower CO and soot emission, but increased NO emission was observed due to improved combustion.

Effect of geometric and operating parameters on the spray characteristics of an open-end swirl injector

2019 ◽  
Vol 233 (12) ◽  
pp. 4457-4467 ◽  
Author(s):  
Chen Chen ◽  
Yang Yang ◽  
Xiaorong Wang ◽  
Wenxian Tang
Keyword(s):  
Pressure Drop ◽  
Discharge Coefficient ◽  
Cone Angle ◽  
Injection Pressure ◽  
Operating Parameters ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Breakup Length ◽  
Swirl Chamber ◽  
Swirl Injector

To study the influence of geometric and operating parameters on the spray characteristics of an open-end swirl injector, seven injectors with different tangential inlet diameters ( D p) and injector length to injector orifice diameter ( L/D) ratios were tested and simulated. Using high-speed backlight, the evolution laws of liquid film thickness, discharge coefficient, spray cone angle, breakup length, and velocity distribution in the swirl chamber under different geometric and operating parameters were captured after unified image processing. Low-injection pressure drop is directly proportional to the discharge coefficient and the spray cone angle. When the injection pressure drop approaches or reaches a critical value of 0.4 MPa, the discharge coefficient and spray cone angle remain nearly constant with maximum fluctuations of 1% and 5%, respectively. With an increase in the geometric characteristic constant A, the liquid film thickness, discharge coefficient, breakup length, and velocity in the swirl chamber decrease, whereas the spray cone angle increases. As the viscous effect increases for increasing L/D, the discharge coefficient and breakup length increase, whereas the spray cone angle decreases. Based on experiment results, empirical formulas for the discharge coefficient, spray angle, and breakup length were put forward as reference for engineering applications, including the effect of the geometric and operating parameters.

scholarly journals Design Features Influencing the Distribution of Fuel Within the Spray From an Air Blast Fuel Injector

1992 ◽  
Author(s):  
F. W. Stringer ◽  
A. N. Irwin
Keyword(s):  
Rapid Determination ◽  
Cone Angle ◽  
Effective Area ◽  
Fuel Injector ◽  
Design Features ◽  
Spray Cone Angle ◽  
Spray Cone ◽  
Air Blast ◽  
Fuel Distribution ◽  
Swirl Chamber

This paper describes work carried out to determine the influence of several design features upon the performance of an air blast fuel injector. The design features studied were the number of tangential fuel holes feeding the swirl chamber, the depth of the swirl chamber, and the shape of the downstream section of the swirl chamber. The performance parameters considered were, fuel distribution, flow number, air side effective area, spray cone angle and spray SMD. The fuel used was aviation kerosine. Apparatus for the relatively simple and rapid determination of the fuel distribution within the spray is also described.

Measurements of n-Heptane Liquid Length and Spray Cone Angle for Low-Temperature, Low-Density Conditions in an Optically Accessible Flow Vessel

2014 ◽  
Author(s):  
Jin Wang ◽  
Kemar C. James ◽  
Michael C. Maynard ◽  
Brian T. Fisher
Keyword(s):  
Liquid Phase ◽  
Low Temperature ◽  
High Speed ◽  
Direct Injection ◽  
Cone Angle ◽  
Low Density ◽  
Low Temperature Combustion ◽  
Ambient Conditions ◽  
Spray Cone Angle ◽  
Spray Cone

The purpose of this study was to measure global properties of n-heptane sprays using high-speed spray visualization in a newly developed constant-pressure flow vessel. Liquid-phase fuel penetration distance and cone angle were determined for low-density and low-temperature ambient conditions, which are increasingly relevant due to the advent of early direct-injection low-temperature combustion. Results indicated that fuel sprays under these conditions do not behave as predicted by established models. Penetration distances increased steadily throughout and after injection, and liquid-phase fuel persisted long after end of injection. Results suggest that these sprays vaporize extremely slowly and could cause wall-wetting issues.

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