scholarly journals I.1 Heavy-Duty Diesel Combustion (Sandia National Laboratories).

2021 ◽  
Author(s):  
Ales Srna
Keyword(s):  
Diesel Combustion ◽  
Heavy Duty ◽  
Heavy Duty Diesel

Exploring the high load potential of diesel–methanol dual-fuel operation with Miller cycle, exhaust gas recirculation, and intake air cooling on a heavy-duty diesel engine

2020 ◽  
pp. 146808742092677
Author(s):  
Wei Guan ◽  
Xinyan Wang ◽  
Hua Zhao ◽  
Haifeng Liu
Keyword(s):  
Exhaust Gas Recirculation ◽  
High Load ◽  
Dual Fuel ◽  
Air Cooling ◽  
Exhaust Gas ◽  
Diesel Combustion ◽  
Heavy Duty ◽  
Ignition Timing ◽  
Heavy Duty Diesel ◽  
Gas Recirculation

Legislations concerning emissions from heavy-duty diesel engines are becoming increasingly stringent. This requires conventional diesel combustion to be compliant using costly and sophisticated aftertreatment systems. Preferably, diesel–methanol dual-fuel is one of the suitable alternative combustion modes as it can potentially reduce the formation of nitrogen oxide and soot emissions which characterised the diesel mixing-controlled combustion. This is primarily due to the high latent heat of vaporisation and oxygen content of the methanol fuel. At high engine loads, however, the potential of diesel–methanol dual-fuel operation is constrained by the excessive combustion pressure rise rate and peak in-cylinder pressure, which limits both the engine efficiency and the percentage of methanol that can be used. For the first time, experimental studies were conducted to explore advanced combustion control strategies such as Miller cycle, exhaust gas recirculation, and intake air cooling for improving upon high load diesel–methanol dual-fuel combustion. Experiments were carried out at 1200 r/min and 18 bar indicated mean effective pressure on a single-cylinder heavy-duty diesel engine, which equipped with a high pressure common rail diesel injection, a methanol port fuel injection, and a variable valve actuation system on the intake camshaft. Results showed that the methanol energy fraction of a conventional diesel–methanol dual-fuel operation with a baseline intake valve closing timing was limited to 28%. This was due to the high combustion temperature at a high load which advanced the ignition timing of the premixed charge, resulting in high levels of pressure rise rate. The application of lower effective compression ratio and intake air temperature ( Tint) effectively decreased the compression temperature, which successfully delayed the ignition timing of the premixed charge. This allowed for a more advanced diesel injection timing to achieve improvement in the thermal efficiency and potentially enabled a higher methanol substitution ratio. Although the introduction of exhaust gas recirculation demonstrated very slight impact on the ignition timing of the premixed charge, a higher net indicated efficiency was observed due to a relatively lower local combustion temperature which reduced heat transfer loss. Moreover, the optimised diesel–methanol dual-fuel operation allowed a higher methanol energy fraction of 40% to be used at an effective compression ratio of 14.3 and Tint of 305 K and achieved the highest net indicated efficiency of 47.4%, improving by 3.7% and 2.6%, respectively, when compared to the optimised conventional diesel combustion (45.7%) and conventional diesel–methanol dual-fuel (46.2%). This improvement was accompanied with a reduction of 37% in nitrogen oxide emissions and little impact on soot emissions in comparison with the conventional diesel combustion.

Premixed Diesel Combustion Analysis in a Heavy-Duty Diesel Engine

2003 ◽  
Author(s):  
Adam E. Klingbeil ◽  
Harmit Juneja ◽  
Youngchul Ra ◽  
Rolf D. Reitz
Keyword(s):  
Diesel Engine ◽  
Diesel Combustion ◽  
Heavy Duty ◽  
Combustion Analysis ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel

scholarly journals Particulate emissions of heavy duty diesel engines measured from the tailpipe and the dilution tunnel

2021 ◽  
pp. 105799
Author(s):  
Sheng Su ◽  
Tao Lv ◽  
Yitu Lai ◽  
Jinsong Mu ◽  
Yunshan Ge ◽  
...  
Keyword(s):  
Diesel Engines ◽  
Particulate Emissions ◽  
Heavy Duty ◽  
Heavy Duty Diesel

scholarly journals Effects of renewable fuel and exhaust aftertreatment on primary and secondary emissions from a modern heavy-duty diesel engine

2021 ◽  
Vol 156 ◽  
pp. 105781
Author(s):  
Louise Gren ◽  
Vilhelm B. Malmborg ◽  
John Falk ◽  
Lassi Markula ◽  
Maja Novakovic ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Exhaust Aftertreatment ◽  
Heavy Duty ◽  
Renewable Fuel ◽  
Heavy Duty Diesel Engine ◽  
Heavy Duty Diesel
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