3D Simulations by a Detailed Chemistry Combustion Model and Comparison With Experiments of a Light-Duty, Common-Rail D.I. Diesel Engine

2005 ◽  
Author(s):  
Felice E. Corcione ◽  
Michela Costa ◽  
Bianca M. Vaglieco ◽  
Hiroshi Omote
Keyword(s):  
Diesel Engine ◽  
Common Rail ◽  
Combustion Model ◽  
Detailed Chemistry ◽  
3D Simulations ◽  
Light Duty ◽  
Comparison With Experiments

Common Rail Multi-Jet Diesel Engine Combustion Model Development for Control Purposes

2007 ◽  
Author(s):  
Fabrizio Ponti ◽  
Enrico Corti ◽  
Gabriele Serra ◽  
Matteo De Cesare
Keyword(s):  
Diesel Engine ◽  
Model Development ◽  
Common Rail ◽  
Combustion Model ◽  
Engine Combustion

Assessment of the Predictive Capabilities of a Combustion Model for a Modern Common Rail Automotive Diesel Engine

2016 ◽  
Author(s):  
Andrea Piano ◽  
Federico Millo ◽  
Giulio Boccardo ◽  
Mahsa Rafigh ◽  
Alessandro Gallone ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Common Rail ◽  
Combustion Model

Development of a Common Rail Diesel Engine Combustion Model for ROHR Real-Time Estimation

2011 ◽  
Author(s):  
Fabrizio Ponti ◽  
Vittorio Ravaglioli ◽  
Matteo De Cesare
Keyword(s):  
Diesel Engine ◽  
Real Time ◽  
Combustion Process ◽  
Time Estimation ◽  
Experimental Tests ◽  
Common Rail ◽  
Combustion Model ◽  
Combustion Control ◽  
Injection Parameters ◽  
Real Time Estimation

Combustion control is a crucial aspect in modern Diesel engines control strategies, mainly due to the requests to increase efficiency and maintain pollutant emissions within the values bounded by standard regulations. In order to perform an accurate combustion control, modern “closed loop” control algorithms require the evaluation of a large number of quantities that provide information about combustion process effectiveness. This work presents a methodology that allows real-time estimation of energy released, during the combustion process, in a Common Rail Multi-Jet Diesel engine. This procedure can be divided in two main steps. The first step consists in the development of a zero-dimensional combustion model based on the linear combination of a proper number of Wiebe functions. In this case, a zero-dimensional approach has been chosen, because it is accurate enough for this analysis and requires low computational efforts. Once the combustion model has been developed, it can be used to determine Rate of Heat Release (RoHR) and the angular position in which 50% of fuel burned within an engine cycle is reached (MFB50). The second section of this work describes the relationships existing between injection parameters (such as Start of Injection, injected fuel quantities, rail pressure...) and the Wiebe parameters identified in the first step of the procedure. The above mentioned relationships have been used to set up correlations that allow estimating Wiebe parameters, therefore ROHR and MFB50, starting from injection parameters. The results obtained in MFB50 estimation are particularly emphasized, because real-time knowledge of this quantity is necessary to feedback a control algorithm for optimal combustion positioning. This work is based on several experimental tests performed on a 2.2 liters Common Rail Multi-Jet Diesel engine. First, experimental tests have been carried out to identify the combustion model and the correlations existing between Wiebe parameters and injection parameters. Then, in order to determine the accuracy of the approach, the complete estimation methodology has been applied to the engine under study. This work describes a methodology for real-time estimation of several quantities that provide important information about combustion process effectiveness (useful, for example, in modern low temperature combustion control systems). No extra cost is needed, because the methodology requires no additional sensor.

Comparison of Representative Interactive Flamelet and Detailed Chemistry Based Combustion Models for Internal Combustion Engines

2014 ◽  
Author(s):  
M. Wang ◽  
M. Raju ◽  
E. Pomraning ◽  
P. Kundu ◽  
Y. Pei ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Internal Combustion Engines ◽  
Mixture Fraction ◽  
Spray Cooling ◽  
Combustion Model ◽  
Combustion Engines ◽  
Detailed Chemistry ◽  
Combustion Models ◽  
Computational Fluid Dynamics Cfd ◽  
Lift Off

Representative Interactive Flamelet (RIF) and Detailed Chemistry based combustion models are two commonly used combustion models for non-premixed diesel engine simulations. RIF performs transient chemistry calculations on a one-dimensional grid based on the mixture fraction coordinate. Hence, the chemistry calculations are essentially decoupled from the computational fluid dynamics (CFD) grid. The detailed chemistry model, on the other hand, solves transient chemistry in the 3D CFD domain. An efficient parallelization strategy is used for the computation of the multiple flamelets RIF model. The multiple flamelets RIF and detailed chemistry combustion models are applied for modeling a constant volume spray combustion case and a diesel engine case, with a view to compare the differences between the two models. Results for ignition delay, flame lift-off length, cylinder pressure, and emissions are compared with experimental data. The effect of number of flamelets is evaluated. Finally, the effect of spray cooling is investigated based on the results from the RIF model and the detailed chemistry based combustion model.

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