CFD Optimization of DI Diesel Engine Performance and Emissions Using Variable Intake Valve Actuation with Boost Pressure, EGR and Multiple Injections

2002 ◽  
Author(s):  
R. Shrivastava ◽  
R. Hessel ◽  
Rolf D. Reitz
Keyword(s):  
Diesel Engine ◽  
Engine Performance ◽  
Boost Pressure ◽  
Intake Valve ◽  
Multiple Injections ◽  
Performance And Emissions ◽  
Di Diesel Engine ◽  
Engine Performance And Emissions ◽  
Cfd Optimization ◽  
Valve Actuation

scholarly journals Numerical Study on the Performance and NOx Emission Characteristics of an 800cc MPI Turbocharged SI Engine

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7419
Author(s):  
Seungmin Kim ◽  
Jaesam Shim ◽  
Youngsoo Cho ◽  
Back-Sub Sung ◽  
Jungsoo Park
Keyword(s):  
Engine Performance ◽  
Boost Pressure ◽  
Exhaust Gas ◽  
Intake Valve ◽  
Si Engine ◽  
Spark Timing ◽  
Performance And Emissions ◽  
Valve Overlap ◽  
Engine Performance And Emissions ◽  
Exhaust Gas Emissions

The main purpose of this study is to optimize engine performance and emission characteristics of off-road engines with retarded spark timing compared to MBT by repurposing the existing passenger engine. This study uses a one-dimensional (1D)-simulation to develop a non-road gasoline MPI turbo engine. The SI turbulent flame model of the GT-suite, an operational performance predictable program, presents turbocharger matching and optimal operation design points. To optimize the engine performance, the SI turbulent model uses three operation parameters: spark timing, intake valve overlap, and boost pressure. Spark timing determines the initial state of combustion and thermal efficiency, and is the main variable of the engine. The maximum brake torque (MBT) point can be identified for spark timing, and abnormal combustion phenomena, such as knocking, can be identified. Spark timing is related to engine performance, and emissions of exhaust pollutants are predictable. If the spark timing is set to variables, the engine performance and emissions can be confirmed and predicted. The intake valve overlap can predict the performance and exhaust gas by controlling the airflow and combustion chamber flow, and can control the performance of the engine by controlling the flow in the cylinder. In addition, a criterion can be set to consider the optimum operating point of the non-road vehicle while investigating the performance and exhaust gas emissions accompanying changes in boost pressure With these parameters, the design of experiment (DoE) of the 1D-simulation is performed, and the driving performance and knocking phenomenon for each RPM are predicted during the wide open throttle (WOT) of the gasoline MPI Turbo SI engine. The multi-objective Pareto technique is also used to optimize engine performance and exhaust gas emissions, and to present optimized design points for the target engine, the downsized gasoline MPI Turbo SI engine. The results of the Pareto optimal solution showed a maximum torque increase of 12.78% and a NOx decrease of 54.31%.

Applications of bio-oil-based emulsions in a DI diesel engine: The effects of bio-oil compositions on engine performance and emissions

Energy ◽  
2018 ◽  
Vol 154 ◽  
pp. 110-118 ◽  
Author(s):  
Xingzhong Yuan ◽  
Xiaowei Ding ◽  
Lijian Leng ◽  
Hui Li ◽  
Jianguang Shao ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Engine Performance ◽  
Bio Oil ◽  
Performance And Emissions ◽  
Di Diesel Engine ◽  
Engine Performance And Emissions

scholarly journals Biodiesel as an Alternate Fuel in a Diesel Engine with the Cooled Exhaust Gas Recirculation–A Measure to Reduce Harmful Emissions

2011 ◽  
pp. 136-141
Author(s):  
S. Adinarayana ◽  
YMC Sekhar ◽  
M. Anil Prakash ◽  
BVA Rao
Keyword(s):  
Diesel Engine ◽  
Engine Performance ◽  
Exhaust Gas Recirculation ◽  
Exhaust Gas ◽  
Oxygenated Fuel ◽  
Harmful Emissions ◽  
Performance And Emissions ◽  
Di Diesel Engine ◽  
Engine Performance And Emissions ◽  
Gas Recirculation

Biodiesels reduce the emissions like HC, CO and particulate matter to minimum possible extent. But the NOx emissions increase because of the reason that the biodiesel is an oxygenated fuel. To contain this particular emission which is responsible for the human health degradation, acid rain, smog creation etc., the Exhaust Gas Recirculation (EGR) technique is resorted to. In this paper, a laboratory based DI diesel engine is run with neat biodiesel (Jatropha Methyl Ester) and cooled EGR which replaces a part of incoming air during suction. Various percentages (viz.0%, 7%, and 14%) of EGR were practiced to investigate the effect on the engine performance and tail pipe emissions. EGR dilutes the charge in the cylinder and thus reduces the peak combustion temperatures. Lower combustion temperatures decrease the formation of NOx with the marginal penalty of increase in other emissions. A comparison was made with the implementation of neat diesel and EGR application to consolidate the performance differences emerge in these cases. 7% EGR is proved to be the best percentage by considering both engine performance and emissions.

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