Modeling Atomization of High-Pressure Diesel Sprays

2000 ◽  
Vol 123 (2) ◽  
pp. 419-427 ◽  
Author(s):  
G. M. Bianchi ◽  
P. Pelloni ◽  
F. E. Corcione ◽  
L. Allocca ◽  
F. Luppino
Keyword(s):  
High Pressure ◽  
Common Rail ◽  
Droplet Breakup ◽  
Injection System ◽  
Spray Cone ◽  
Common Rail Injection System ◽  
Spray Structure ◽  
Numerical Predictions ◽  
Common Rail Injection ◽  
Evaporating Spray

This paper deals with a numerical and experimental characterization of a high-pressure diesel spray injected by a common-rail injection system. The experiments considered a free non-evaporating spray and they were performed in a vessel reproducing the practical density that characterizes a D.I. diesel engine at injection time. The fuel was supplied at high pressure by a common-rail injection system with a single hole tip. The computations have been carried out by using both the TAB model and a hybrid model that allows one to describe both liquid jet atomization and droplet breakup. In order to validate the breakup model, an extensive comparison between data and numerical predictions has been carried out in terms of spray penetration, Sauter mean diameter, near and far spray cone angles, and spray structure.

Dynamic Analysis of Diesel Engine Common Rail Injection System: Part II — Four-Cylinder Injection System

2001 ◽  
Author(s):  
M. Borghi ◽  
M. Milani ◽  
M. Piraccini
Keyword(s):  
High Pressure ◽  
Diesel Engine ◽  
Dynamic Behavior ◽  
Common Rail ◽  
Injection System ◽  
Common Rail System ◽  
Common Rail Injection System ◽  
Rail System ◽  
Common Rail Injection ◽  
The Common

Abstract The paper is aimed at studying the overall dynamic behavior of the Common Rail Injection System actually used on a 4 cylinder industrial Diesel engine. Firstly, the paper introduces the main characteristics of a lumped and distributed parameters model of the high pressure branch of an actual Common Rail System, and the main hypotheses assumed to model it using a multi-port approach code for the analysis of the dynamic response of hydraulic systems submitted to fast transients. The model of the Common Rail System is then used to study its dynamic behavior when involved in the handling of the engine injection cycle for medium values of the crankshaft regime and for different pressure levels in the Rail. The analysis is performed applying to the injectors, to the pressure control valve and to the high-pressure pump the control strategies imposed by the Electronic Central Unit (ECU), as actually implemented into an industrial ECU for Diesel engine management. The model reliability and accuracy are evidenced through a numerical vs. experimental data comparison, mainly in term of rail pressure dynamic behavior. The analysis successively outlined in the paper allows to state how the hydraulic behavior of the Common Rail System interact with the electro-hydraulic injectors dynamics, and to determine the influence of this interaction on the total injected mass per cycle.

Laboratory Testing of a High-Pressure Common Rail Injection Systems

2015 ◽  
Vol 799-800 ◽  
pp. 560-564 ◽  
Author(s):  
Petr Starý ◽  
Josef Popelka
Keyword(s):  
High Pressure ◽  
Laboratory Testing ◽  
Common Rail ◽  
Inlet Pressure ◽  
Injection System ◽  
System Monitoring ◽  
Common Rail Injection System ◽  
Common Rail Injection ◽  
The Relationship ◽  
High Pressure Common Rail

This article deals with the general issues of laboratory testing of high-pressure common rail injection system. Monitoring the movement of the needle and dynamic pressures is of great importance for further research, which will investigate the relationship between the movement of the lifting solenoid and the dynamics of the inlet pressure. At the same time we examined the possibility of operation for biofuel.

Sign in / Sign up

Export Citation Format

Share Document