Analysis of the Combustion Process in a Transparent Passenger Car DI-Diesel Engine by Means of Multidimensional Optical Measurement Techniques

2000 ◽  
Author(s):  
C. Fettes ◽  
S. Schraml ◽  
C. Heimgärtner ◽  
A. Leipertz
Keyword(s):  
Diesel Engine ◽  
Optical Measurement ◽  
Measurement Techniques ◽  
Combustion Process ◽  
Passenger Car ◽  
Di Diesel Engine

Visualization of the Effects of Post Injection and Swirl on the Combustion Process of a Passenger Car Common Rail DI Diesel Engine

2003 ◽  
Author(s):  
Arjan Helmantel ◽  
Joop Somhorst ◽  
Ingemar Denbratt
Keyword(s):  
Diesel Engine ◽  
Combustion Chamber ◽  
Flame Temperature ◽  
Combustion Process ◽  
Small Diameter ◽  
Ccd Camera ◽  
Common Rail ◽  
Post Injection ◽  
Passenger Car ◽  
Di Diesel Engine

The effects of variations in injection strategy and swirl on a DI Diesel engine performance and emissions were tested. The cylinder head was fitted with a small diameter endoscope, coupled with a triggered CCD camera, in order to study the effect of these variations on the combustion process. The images that were taken of the combustion process were used to calculate the spatial and temporal distribution of flame temperature and soot kks factor by using the 2-color method. The engine used in the experiments is a single cylinder version of a modern, passenger car type, common rail Diesel engine with a displacement of 480 cc. The fitted endoscope caused very little interference with the combustion chamber due to its small dimensions. The 65 degree angle view of the endoscope allowed coverage of a large portion of the entire combustion chamber. The combustion images and derived temperatures and soot concentrations were used to study the influence of post injection and high swirl. Adding a third (post) injection to the pilot and main injection increases the mixing and the flame temperature during the second half of the combustion process, thereby improving soot oxidation. The fuel efficiency was not negatively affected by the later phasing of part of the heat release. Increased swirl of the intake air was also studied. An 80% increase in swirl-ratio was achieved by closing off one of the two intake ports with a butterfly valve. The improved mixing gave significant reductions in soot emissions, with a small increase in NOx formation.

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.

Realization of a Fully Optically Accessible Medium Speed Large Bore Engine Using a Fisheye Optic

2020 ◽  
Author(s):  
Stephan Karmann ◽  
Christian Friedrich ◽  
Maximilian Prager ◽  
Georg Wachtmeister
Keyword(s):  
High Speed ◽  
Optical Measurement ◽  
Measurement Techniques ◽  
Combustion Process ◽  
Engine Operation ◽  
New Approach ◽  
Medium Speed ◽  
Starting Point ◽  
Nominal Load ◽  
Fire Engine

Abstract To address one of the main environmental concerns, the engine out emissions, an enhanced understanding of the combustion process itself is fundamental. Recent optical and laser optical measurement techniques provide a promising approach to investigate and optimize the combustion process regarding emissions. These measurement techniques are already quite common for passenger car and truck size engines and significantly contribute to their improvement. Transferring these measurement techniques to large bore engines from low to high speed is still rather more uncommon especially due to the bigger challenges caused by the engine size and thus much higher stability requirements and design effort for optical accessibility. To cover this new field of research a new approach for a medium speed large bore engine was developed using a fisheye optic mounted centrally in the cylinder head to design a fully optically accessible engine test bench. This new approach is detailed with a test setup layout and a stability concept consisting of cooling systems and the development of a suitable operation strategy based on simulation and experimental verification. The design of this single cylinder engine with 350mm bore and 440mm stroke providing 530kW nominal load at 750 rpm was tested up to 85% nominal load in skipped fire engine operation mode. The measurements of the flame chemiluminescence of a dual fuel combustion of the diesel gas type present proof of the feasibility of the new design as a starting point for future systematic studies on the combustion process of large bore engines.

AKONDIES — An exhaust concept for a Euro IV passenger car DI diesel engine (II)

MTZ worldwide ◽  
2003 ◽  
Vol 64 (12) ◽  
pp. 41-44
Author(s):  
Christian Knab ◽  
Kurt Weidmann ◽  
Hans-Ulrich Franke ◽  
Carsten Jutka ◽  
Helmut Tschöke ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Passenger Car ◽  
Di Diesel Engine

The 2-Stroke DI-Diesel Engine with Common Rail Injection for Passenger Car Application

1998 ◽  
Author(s):  
J. Abthoff ◽  
F. Duvinage ◽  
T. Hardt ◽  
M. Krämer ◽  
M. Paule
Keyword(s):  
Diesel Engine ◽  
Common Rail ◽  
Passenger Car ◽  
Common Rail Injection ◽  
Di Diesel Engine

Effects of EGR on combustion process of DI diesel engine during cold start

2008 ◽  
Vol 2 (2) ◽  
pp. 202-210 ◽  
Author(s):  
Haiyong Peng ◽  
Yi Cui ◽  
Lei Shi ◽  
Kangyao Deng
Keyword(s):  
Diesel Engine ◽  
Combustion Process ◽  
Cold Start ◽  
Di Diesel Engine
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