Multi-objective optimization of diesel injection parameters in a natural gas/diesel reactivity controlled compression ignition engine

Motlagh, Tara Yazdani; Azadani, Leila N.; Yazdani, Kaveh

doi:10.1016/j.apenergy.2020.115746

Cited by 19 publications

(5 citation statements)

References 32 publications

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“…Gülcan also conducted a study on the influence of NG injection timing 14 . Many scholars have investigated the effect of injector structure on the combustion and emission performance of a dual fuel engine 15 – 18 . Dai conducted a study related to the effects of injection timing, injection pressure, and exhaust gas recirculation (EGR) 19 .…”

Section: Introductionmentioning

confidence: 99%

The impact of scavenging air state on the combustion and emission performance of marine two-stroke dual-fuel engine

Yu,

Gao,

Zhang

et al. 2024

Sci Rep

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The scavenging process significantly affects the combustion and emission performance of marine low-speed two-stroke dual-fuel engines. Optimizing scavenging air pressure and temperature can enhance the engine's combustion efficiency and emission control performance, thereby achieving more environmentally friendly and efficient operation of dual-fuel engines. This study focuses on marine low-speed two-stroke dual-fuel engines, analyzing the effects of scavenging air pressure (3.0 bar, 3.25 bar, 3.5 bar, and 3.75 bar) and scavenging air temperature (293 K, 303 K, and 313 K) on engine performance and emission products. The results indicate that scavenging air pressure has a greater impact on engine performance than scavenging air temperature. An increase in scavenging air pressure leads to higher thermal efficiency and power. As the scavenging air pressure increases from 3 to 3.75 bar, the indicated thermal efficiency (ITE) increases from 44.02 to 53.26%, and indicated mean effective pressure (IMEP) increases by approximately 0.35 MPa. Increased scavenging air pressure improves nitrogen oxide (NOx) and hydrocarbons (HC) emissions. For every 0.25 bar increase in scavenging air pressure, NOx emissions decrease by 3.53%, HC emissions decrease by 33.35%, while carbon dioxide (CO2) emissions increase by 0.71%. An increase in scavenging air temperature leads to lower ITE and IMEP. As the air temperature changes from 293 to 313 K, the ITE decreases by approximately 1%, and IMEP decreases by about 0.04 MPa. Increased scavenging air temperature improves CO2 emissions. For every 10 K increase in the air temperature, the CO2 emissions decrease by 0.02%, while NOx emissions increase by 4.84%, HC emissions increase by 34.39%. Therefore, controlling scavenging air pressure is more important than scavenging air temperature in the operational management of marine two-stroke engines. Higher power and lower NOx and HC emissions can be achieved by increasing the scavenging air pressure.

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Section: Introductionmentioning

confidence: 99%

The impact of scavenging air state on the combustion and emission performance of marine two-stroke dual-fuel engine

Yu,

Gao,

Zhang

et al. 2024

Sci Rep

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“…Liu et al 22 found the favorable injection parameters and combustion chamber shape of a natural gas/diesel dual fuel engine based on NSGA-II and KIVA-3A. For experimental study, Motlagh et al 23 optimized seven injection parameters and then minimized exhaust emission and the maximum pressure rise rate. Dhayanandh et al 24 designed an experiment by central composite design and applied variance and response surface methodology analysis to optimize injection parameters.…”

Section: Introductionmentioning

confidence: 99%

Multi-Optimization of Injection Parameters Affecting Emissions in a Diesel Engine Fueled with Fischer–Tropsch Fuel Based on NSGA-II

Shi

Liu

et al. 2023

ACS Omega

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In this paper, an electronically controlled diesel engine fueled with Fischer–Tropsch fuel was selected to optimize soot and NO x emissions. First, the effects of injection parameters on exhaust performance and combustion properties were studied on an engine test bench and then a prediction model based on a support vector machine (SVM) was established according to the test results. On this basis, a decision analysis of soot and NO x solutions assigned with different weights was performed based on the TOPSIS analysis method. It turned out that the “trade-off” relation between soot and NO x emission was improved effectively. As a matter of fact, the Pareto front selected by this method showed a significant decline compared with the original operating points, in which soot declined by 3.7–7.1% and NO x declined by 1.2–2.6%. Finally, the experiments were used to confirm the validity of the results, which indicated that the Pareto front corresponded well with the test value. The maximum relative error between the soot Pareto front and the measured value is 8% while it is 5% for NO x emission, and the R 2 values of soot and NO x under various conditions are more than 0.9. This instance proved that research on diesel engine emission optimization based on the SVM and NSGA-II is feasible and valid.

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“…The meta-model developed has reliable accuracy and the engine performance after optimization using genetic algorithm achieves the expected results. Motlagh et al [21] optimized seven injection parameters of a natural gas/diesel engine based on the OpenFOAM software and explored the effect of injection parameters on combustion and pollutant generation processes.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Parameter Sensitivity on Engine Optimization Results

Jiang,

Zeng,

et al. 2023

Energies

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The effects of six control parameters, intake valve opening timing (IVO), exhaust valve opening timing (EVO), compression ratio (CR), engine speed, intake temperature, and intake pressure on engine output power, indicated specific fuel consumption (ISFC), and nitrogen oxides (NOx) emissions, are analyzed through engine simulation. The six parameters were categorized into two groups based on the degree of influence: high influence (EVO, speed and intake pressure) and low influence (CR, IVO and intake temperature). The relationship between these two groups of parameters and power, ISFC and NOx emissions was explored. Optimization was carried out for each of the two groups of parameters, and the optimization of the high impact parameters resulted in a higher diversity and wider distribution of the solution set. On the other hand, the optimization of the low-impact parameters resulted in a more concentrated distribution of the solution set, while better reflecting the trade-off between the optimization objectives. For the optimal solutions for both sets of parameters, the high-impact parameters provided significant optimization performance compared to the standard operating conditions. Although power and ISFC were optimized, the optimal solution for the low-impact parameter performed poorly with a significant increase in NOx emissions. Therefore, the parameters should be evaluated for optimization using high impact parameters to improve engine performance.

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Multi-objective optimization of diesel injection parameters in a natural gas/diesel reactivity controlled compression ignition engine

Cited by 19 publications

References 32 publications

The impact of scavenging air state on the combustion and emission performance of marine two-stroke dual-fuel engine

The impact of scavenging air state on the combustion and emission performance of marine two-stroke dual-fuel engine

Multi-Optimization of Injection Parameters Affecting Emissions in a Diesel Engine Fueled with Fischer–Tropsch Fuel Based on NSGA-II

Study on the Effect of Parameter Sensitivity on Engine Optimization Results

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