Comparative Study on Effect of Intake Pressure on Diesel and Biodiesel Low Temperature Combustion Characteristics in a Compression Ignition Engine

2013 ◽  
Author(s):  
Sunyoup Lee ◽  
Jaehoon Jang ◽  
Seungmook Oh ◽  
Yonggyu Lee ◽  
Junghwan Kim ◽  
...  
Keyword(s):  
Low Temperature ◽  
Comparative Study ◽  
Combustion Characteristics ◽  
Low Temperature Combustion ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Temperature Combustion ◽  
Intake Pressure

Performance of multi-dimensional models for simulating diesel premixed charge compression ignition engine combustion using low- and high-pressure injectors

2005 ◽  
Vol 6 (5) ◽  
pp. 475-486 ◽  
Author(s):  
S-C Kong ◽  
Y Ra ◽  
R D Reitz
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Spray Angle ◽  
Low Temperature Combustion ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Detailed Chemistry ◽  
Engine Combustion ◽  
Temperature Combustion ◽  
Hsdi Diesel Engine

An engine CFD model has been developed to simulate premixed charge compression ignition (PCCI) combustion using detailed chemistry. The numerical model is based on the KIVA code that is modified to use CHEMKIN as the chemistry solver. The model was applied to simulate ignition, combustion, and emissions processes in diesel engines operated to achieve PCCI conditions. Diesel PCCI experiments using both low- and high-pressure injectors were simulated. For the low-pressure injector with early injection (close to intake valve closure), the model shows that wall wetting can be minimized by using a pressure-swirl atomizer with a variable spray angle. In the case of using a high-pressure injector, it is found that late injection (SOI = 5 ° ATDC) benefits soot emissions as a result of low-temperature combustion at highly premixed conditions. The model was also used to validate the emission reduction potential of an HSDI diesel engine using a double injection strategy that favours PCCI conditions. It is concluded that the present model is useful to assess future engine combustion concepts, such as PCCI and low-temperature combustion (LTC).

Investigation of Low Temperature Combustion Regimes of Biodiesel With n-Butanol Injected in the Intake Manifold of a Compression Ignition Engine

2012 ◽  
Author(s):  
Valentin Soloiu ◽  
Marvin Duggan ◽  
Henry Ochieng ◽  
David Williams ◽  
Gustavo Molina ◽  
...  
Keyword(s):  
Low Temperature ◽  
Heat Release ◽  
Combustion Chamber ◽  
Nox Reduction ◽  
Intake Manifold ◽  
Power Stroke ◽  
Low Temperature Combustion ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Temperature Combustion

In this study, the in-cylinder soot and NOx trade off was investigated in a Compression Engine by implementing Premixed Charge Compression Ignition (PCCI) coupled with Low Temperature Combustion (LTC) for selected regimes of 1–3 bars IMEP. In order to achieve that, an omnivorous (multi-fuel) single cylinder diesel engine was developed by injecting n-butanol in the intake port while being fueled with biodiesel by direct injection in the combustion chamber. By applying this methodology, the in-cylinder pressure decreased by 25% and peak pressure was delayed in the power stroke by about 8 CAD for the cycles in which the n-butanol was injected in the intake manifold at the engine speed of 800 rpm and low engine loads, corresponding to 1–3 bars IMEP. Compared with the baseline taken with ultra-low sulfur diesel no. 2 (USLD#2), the heat release presented a more complex shape. At 1–2 bars IMEP, the premixed charge stage of the combustion totally disappeared and a prolonged diffusion stage was found instead. At 3 bars IMEP, an early low temperature heat release was present that started 6 degrees (1.25 ms) earlier than the diesel reference heat release with a peak at 350 CAD corresponding to 1200 K. Heat losses from radiation of burned gas in the combustion chamber decreased by 10–50% while the soot emissions showed a significant decrease of about 98%, concomitantly with a 98% NOx reduction at 1 IMEP, and 77% at 3 IMEP, by controlling the combustion phases. Gaseous emissions were measured using an AVL SESAM FTIR and showed that there were high increases in CO, HC and NMHC emissions as a result of PCCI/LTC strategy; nevertheless, the technology is still under development. The results of this work indicate that n-butanol can be a very promising fuel alternative including for LTC regimes.

Hydrocarbon Species Impact on NO to NO2 Conversion in a Compression Ignition Engine Under Low Temperature Combustion Conditions

2021 ◽  
Author(s):  
Nupur Gupta ◽  
Xiao Yu ◽  
Simon LeBlanc ◽  
Nick Eaves ◽  
Ming Zheng
Keyword(s):  
Low Temperature ◽  
Conversion Process ◽  
Intake Manifold ◽  
Renewable Fuels ◽  
Low Temperature Combustion ◽  
Compression Ignition ◽  
Compression Tests ◽  
Compression Ignition Engine ◽  
Temperature Combustion ◽  
The Impact

Abstract Low temperature combustion has proved to be beneficial for low NOx and particulate matter emissions. Renewable fuels, such as biodiesel, alcohol fuels, and ether fuels can further decrease the carbon footprint of the engine. The NO to NO2 ratio in engine out NOx emissions has shown dependency on the concentration of hydrocarbon emissions. This relationship has a significant impact on the design of exhaust after-treatment systems. However, the effect of the renewable fuels on NO to NO2 conversion process is less understood. This paper investigates the impact of DME and propane on the in-cylinder conversion of NO to NO2 in a compression ignition engine. Firing test under low temperature combustion condition is first performed to demonstrate the impact of HC concentration on exhaust NO concentration and composition. Then, motoring tests are performed with a mixture of the HC and NO dosed into the engine intake manifold. The simplified testing scenario makes it easier to understand HC-NO interaction. To simplify the process of understanding the difference in fuel behavior a study of NO to NO2 conversion as a resolution of engine cycle is conducted using a Gas Sampling Valve which is capable of collecting in-cylinder gases at varying crank-angles. The FTIR data from these compression tests can help assist future mechanism studies to be performed. This study aims to describe the impact of the two fuels on the NO to NO2 conversion process and the boundary conditions at which these differences occur.

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