Computational Study of Heat Transfer to the Walls of a DI Diesel Engine

2005 ◽  
Author(s):  
F. Payri ◽  
X. Margot ◽  
A. Gil ◽  
J. Martin
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Computational Study ◽  
Di Diesel Engine

Applying the Representative Interactive Flamelet Model to Evaluate the Potential Effect of Wall Heat Transfer on Soot Emissions in a Small-Bore DI Diesel Engine

2001 ◽  
Author(s):  
Carl Hergart ◽  
Norbert Peters
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Wide Spectrum ◽  
Turbulent Flame ◽  
Combustion Process ◽  
Heat Losses ◽  
Wall Heat Transfer ◽  
Two Phase ◽  
Flamelet Model ◽  
Di Diesel Engine

Abstract Due to the wide spectrum of turbulent and chemical length- and time scales occurring in a HSDI diesel engine, capturing the correct physics and chemistry underlying combustion poses a tremendous modeling challenge. The processes related to the two-phase flow in a DI diesel engine add even more complexity to the total modeling effort. The Representative Interactive Flamelet (RIF) model has gained widespread attention owing to its ability of correctly describing ignition, combustion and pollutant formation phenomena. This is achieved by incorporating very detailed chemistry for the gas phase as well as the soot particle growth and oxidation, without imposing any significant computational penalty. The model, which is based on the laminar flamelet concept, treats a turbulent flame as an ensemble of thin, locally one-dimensional flame structures, whose chemistry is fast. A potential explanation for the significant underprediction of part load soot observed in previous studies applying the model is the neglect of wall heat losses in the flamelet chemistry model. By introducing an additional source term in the flamelet temperature equation, directly coupled to the wall heat transfer predicted by the CFD-code, flamelets exposed to walls are assigned heat losses of various magnitudes. Results using the model in three-dimensional simulations of the combustion process in a small-bore direct injection diesel engine indicate that the experimentally observed emissions of soot may have their origin in flame quenching at the relatively cold combustion chamber walls.

Heat transfer study on DI diesel engine for various fuels

2020 ◽  
Author(s):  
Sibi Pugalenthi ◽  
Raghunath Adimoolam Ganesan ◽  
Raghu Palani
Keyword(s):  
Heat Transfer ◽  
Diesel Engine ◽  
Di Diesel Engine ◽  
Transfer Study

Flow Investigation on Different Combustion Chamber Configuration in a DI Diesel Engine – A CFD Approach

2012 ◽  
Vol 505 ◽  
pp. 420-423 ◽  
Author(s):  
A. Gnana Sagaya Raj ◽  
J.M. Mallikarjuna ◽  
V. Ganesan
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Engine Speed ◽  
Computational Study ◽  
Simple Algorithm ◽  
Fuel Injector ◽  
Governing Equations ◽  
Engine Cylinder ◽  
Flow Investigation ◽  
Di Diesel Engine

The main objective of the present investigation is to make a computational study of flow structure inside the engine cylinder in a DI diesel engine during the end of compression stroke at an engine speed of 1000 rev/min. The analysis has been carried out for four different piston configurations viz., flat piston, centre bowl on flat piston, inclined and inclined offset bowl piston. A polyhedral trimmed cell has been adopted for meshing the geometries using the code called STAR-CD Es-ice. The flow has been simulated by solving the governing equations of conservation of mass, momentum and energy using the SIMPLE algorithm. From this numerical prediction, the best possible combustion chamber configuration and the location of fuel injector on the cylinder head have been arrived.

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