A study of the effect of post injection on combustion and emissions with premixing enhanced fueling strategies

Jeftić, Marko; Zheng, Ming

doi:10.1016/j.apenergy.2015.02.052

Cited by 42 publications

(12 citation statements)

References 32 publications

(100 reference statements)

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“…At post injection the fuel mass is equal 10.5 mg. An almost 4% decrease in indicated work and a 20% decrease in NO x emissions, but a 20% increase in PM emissions can be seen. The received results look similar to other researchers [45][46][47][48]. At the post injection, a fuel mass of 1.75 mg, an almost base case level of indicated work and PM emissions, and a 5% decrease in NO x emissions can be seen.…”

Section: Post Injection Parameters Optimizationsupporting

confidence: 89%

Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester

et al. 2021

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Using biodiesel fuel in diesel engines for heavy-duty transport is important to meet the stringent emission regulations. Biodiesel is an oxygenated fuel and its physical and chemical properties are close to diesel fuel, yet there is still a need to analyze and tune the fuel injection parameters to optimize the combustion process and emissions. A four-injections strategy was used: two pilots, one main and one post injection. A highly advanced SOI decreases the NOx and the compression work but makes the combustion process less efficient. The pilot injection fuel mass influences the combustion only at injection close to the top dead center during the compression stroke. The post injection has no influence on the compression work, only on the emissions and the indicated work. An optimal injection strategy was found to be: pilot SOI 19.2 CAD BTDC, pilot injection fuel mass 25.4%; main SOI 3.7 CAD BTDC, main injection fuel mass 67.3% mg; post SOI 2 CAD ATDC, post injection fuel mass 7.3% (the injection fuel mass is given as a percentage of the total fuel mass injected). This allows the indicated work near the base case level to be maintained, the pressure rise rate to decrease by 20% and NOx emissions to decrease by 10%, but leads to a 5% increase in PM emissions.

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Section: Post Injection Parameters Optimizationsupporting

confidence: 89%

Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester

et al. 2021

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“…Comparable tests were previously conducted with diesel fuel, which showed that the smoke emissions were much higher and more sensitive to the post-injection quantity. 26,31 Conversely, the smoke emissions were ultra-low and unaffected by addition of the post-injection and the post-injection timing when butanol was used. However, addition of the post-injection did have a negative impact on the NO x emissions, as shown in Figure 20.…”

Section: Post-injection Timing Sweepmentioning

confidence: 99%

“…Previous studies have shown that the NOx emissions with diesel fuel were over an order of magnitude higher than the NO x emissions with neat n -butanol. 26 The low smoke emissions were attributed to several properties of n- butanol fuel, as shown in Table 1. n- butanol has a relatively low cetane number which resulted in a relatively long ignition delay of 20–30° CA for this test condition.…”

Section: Single-shot Injection Timing Sweepmentioning

confidence: 99%

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Fuel efficiency analysis and peak pressure rise rate improvement for neat n-butanol injection strategies

Jeftić

Yang

Reader

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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Engine tests were conducted to investigate the efficiency and the peak pressure rise rate performance of different fuel injection strategies for the direct injection of neat n-butanol in a compression ignition engine. Three different strategies were tested: a single-shot injection; a pilot injection; a post-injection. A single-shot injection timing sweep revealed that early injections had the highest indicated efficiency while late injections reduced the peak pressure rise rate at the cost of a slightly reduced thermal efficiency. Delayed single-shot injections also had increased emissions of nitrogen oxides, total hydrocarbon and carbon monoxide. Addition of a pilot injection had a negative effect on the peak pressure rise rate. Because of the low cetane number of butanol and the relatively lean and well-premixed air–fuel mixture, the pilot injection failed to autoignite and instead ignited simultaneously with the main injection. This resulted in slightly increased peak pressure rise rates and significantly increased unburned butanol hydrocarbon emissions. Conversely, the use of an early post-injection produced a noticeable engine power output and allowed the main injection to be shortened and the peak pressure rise rate to be substantially reduced. However, relatively early post-injections slightly reduced the indicated efficiency and increased the nitrogen oxide emissions and the carbon monoxide emissions compared with the single-shot injection strategy. These results recommended the use of a single-shot injection for low loads and medium loads owing to a superior thermal efficiency and suggested that the application of a post-injection may be more suited to high-load conditions because of the substantially reduced peak pressure rise rates.

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“…They concluded that post-injection fuel (7% of the total fuel) at SOI of 10°CA produced a high level of soot while with 15 mg (15% of the total fuel) at SOI 5°CA proved better in the oxidation of soot, also early post-injection reduces soot levels and unregulated emissions. Jeftić and Zheng 32 investigated the influence of post-injection on regulated and unregulated emissions by using diverse SOI in their experiment on a C.I. engine.…”

Section: Introductionmentioning

confidence: 99%

Effect of post-injection strategies on regulated and unregulated harmful emissions from a heavy-duty diesel engine

Farhan

Wang

et al. 2020

International Journal of Engine Research

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An experimental study was carried out to analyze the influence of different post-injection strategies on the regulated and unregulated emissions from a heavy-duty compression ignition (CI) diesel engine. FTIR (Fourier transform infrared spectroscopy) was used to measure and analyze the exhaust emissions which include regulated such as NOx, soot, and unregulated emissions including acetaldehyde, formaldehyde, methane, ethane, propane, ethylene, propylene, and ethyne. Experimental results manifested that the post-injection technique can notably minimize the regulated and unregulated emissions as compared to a single main injection. Under different post-injection conditions, a trade-off relation was also found between soot and NOx emissions. In soot mitigation, the start of injection (SOI) at 40° crank angle (CA) incorporate with 5–15 mg post-injection fuel mass was proved very effective and about 26% lower soot emissions were recorded than single main injection. At SOI 20°CA, with 15 mg post-injection fuel mass, a reduction in the NOx emissions was observed up to 20% and in THC up to 60%. Unregulated emissions (other than formaldehyde and acetaldehyde) were found lower with 5, 10, and 15 mg post-injection fuel mass at 20, 40, 100, and 120°CA but increased at SOI of 60°CA than single main injection. In addition, light HCs, and THC emissions at SOI 60°CA were found to increase which could be beneficial for after-treatment devices.

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A study of the effect of post injection on combustion and emissions with premixing enhanced fueling strategies

Cited by 42 publications

References 32 publications

Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester

Detailed Injection Strategy Analysis of a Heavy-Duty Diesel Engine Running on Rape Methyl Ester

Fuel efficiency analysis and peak pressure rise rate improvement for neat n-butanol injection strategies

Effect of post-injection strategies on regulated and unregulated harmful emissions from a heavy-duty diesel engine

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