Use of Multiple Injection Strategies to Reduce Emission and Noise in Low Temperature Diesel Combustion

Park, Wonah; Ra, Youngchul; Kurtz, Eric; Willems, Werner; Reitz, Rolf D.

doi:10.4271/2015-01-0831

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…Similar grid sizes and numbers of cells used in this study have been demonstrated in many studies. 20, 27–29…”

Section: Simulationsmentioning

confidence: 99%

“…Similar grid sizes and numbers of cells used in this study have been demonstrated in many studies. 20,[27][28][29] Mechanical delay of fuel injection Figure 5 shows the mechanical injection delay from an injection pump to nozzle holes. Even though a pressure rise is occurred in fuel pump, a fuel does not inject into the combustion chamber at the same time.…”

Section: Computational Model and Meshesmentioning

confidence: 99%

See 1 more Smart Citation

A characteristic study and optimization of in-cylinder configuration for particulate matters reduction in an off-highway diesel engine with mechanical fuel injection system

Lee

Park

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper shows development challenges for 11-liter heavy-duty off-highway diesel engines to meet Tier 3 emission regulations with a base diesel engine compliant with Tier 2 emission regulations. In the case of the installation of an exhaust gas recirculation (EGR) system for reduction of NOx emissions, there exists a risk of increased particulate matters (PM) emissions. An in-cylinder PM reduction is still necessary since a diesel particulate filter (DPF) after-treatment system is not under the consideration. The objective of this research is to see whether the base engine has a potential to meet Tier 3 emission regulations by changing in-cylinder configuration parameters including the bowl shape, injector position, the number of intake and exhaust valves, injector tip protrusion, and injector tip specifications such as nozzle spray angle and nozzle flow rate. These parameters are very important parts which enhance the air and fuel mixing process that helps the combustion process. Thus, the optimization of these design variables is essential to improve combustion efficiency and emissions reduction. In this study, the multi-dimensional computational fluid dynamics (CFD) code KIVA-3V is used to perform combustion simulations. The Kelvin–Helmholtz/Rayleigh–Taylor (KH-RT) model is employed for spray breakup and a reduced chemical mechanism for n-heptane is employed to simulate ignition delay and combustion of diesel fuel. To verify the simulation results, engine bench tests were performed with installations of the final version of in-cylinder geometry in C1-8 mode which is one of main test cycles to meet Tier 3 emission regulations. Finally, Tier 3 emission regulations have been met with the currently optimized in-cylinder configuration parameters.

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“…Similar grid sizes and numbers of cells used in this study have been demonstrated in many studies. 20, 27–29…”

Section: Simulationsmentioning

confidence: 99%

Section: Computational Model and Meshesmentioning

confidence: 99%

A characteristic study and optimization of in-cylinder configuration for particulate matters reduction in an off-highway diesel engine with mechanical fuel injection system

Lee

Park

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

show abstract

“…There are numerous researches take place in the domain of combustion optimization of modern diesel engine with different multiple injection strategies [2][3][4][5][6][7][8][9][10][11], injection parameter optimization (injection timing, Injection pressure, injection dwell, fuel quantity, rate shaped etc.) [12][13][14][15][16][17][18][19], alternative fuels [20,21] and EGR or high EGR-low temperature combustion (LTC) [22][23][24][25]; and predictive combustion model [26] with similar objectives. The injection parameter optimization is the sub set of multiple fuel injections.…”

Section: Introductionmentioning

confidence: 99%

“…They reported simultaneous decrease in NOx and Soot by multi-parameter combined optimization (high EGR and late injection timing) though BSFC increase. The influence of split injection strategies examined using a hybrid surrogate fuel CFD model and validation, to improve CN and HC and CO emissions under LTC conditions [24]. They have reported the importance of 1st and 2nd pulse in triple injection for controlling ignition delay and increase fuel quantity of 1st pulse help in reduction of HC and CO like NOx and Noise.…”

Section: Introductionmentioning

confidence: 99%

Emission and performance characteristics of CRDI diesel engine using Quadruple injection strategy with different pilots and post injection timing

Biswas

Mukhopadhyay

2021

Eng. Res. Express

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Multiple injections in association with suitable (High/heavy) exhaust gas recirculation (EGR) is a promising technique to achieve low temperature combustion (LTC) regime in modern CRDI (common rail direct injection) diesel engine. This helps for simultaneous reduction of NOx and Soot to meet the stringent emission norms without penalizing the fuel efficiency and overcome the drawbacks of EGR-LTC. There are limited insights available which discuss about the potentiality of latest Quadruple injection (early-pilot-main-post/after; epMa) strategy in combination with high EGR and different injection timing over triple injections (pilot-main-after; pMa) at wide operating conditions. This paper deals with the study on the effect of Quadruple injection (epMa) startegy on performance, emissions and noise with different Pilot injection timing and post injection dwell combinations (8 Nos) on a CRDI diesel engine with high EGR and fixed main injection schedule at 4 operating loads and 5 speeds. The study shows that Quadruple injection strategy with retarded early and advanced pilot (early 35°and pilot 19°CA BTDC) and advanced post injection dwell timing 1100 ms is superior in providing optimum results in emissions (NOx, PM, THC, CO) and combustion noise (CN)[1.55-2 dBA @Rig level and 0.7 dBA @ Vehicle level Pass by Noise (PBN)]. This gives the best results in brake specific fuel consumption (BSFC)[0.2 to 1.31%], Torque and brake thermal efficiency (BTE) performance w.r.t other combinations and base triple injections (pMa). In contrary, the quadruple injection strategy having advanced double pilots with delayed post injection dwell (early-39°, Pilot-19°CA BTDC and DtA 1300 ms); shows the best CN reduction. Best smoke results found with the combination of retarded pilots and advanced post injection dwell. This study shows the importance of injection timing specially the twin pilots (early, pilot) along with post injection dwell. Furthermore, it indicates the potentiality of newest Quadruple injection strategy over triple injection.

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Time-frequency analysis application to the evaluation of instantaneous combustion noise

D’Ambrosio

Ferrari

Jin

2022

Fuel

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Use of Multiple Injection Strategies to Reduce Emission and Noise in Low Temperature Diesel Combustion

Cited by 7 publications

References 31 publications

A characteristic study and optimization of in-cylinder configuration for particulate matters reduction in an off-highway diesel engine with mechanical fuel injection system

A characteristic study and optimization of in-cylinder configuration for particulate matters reduction in an off-highway diesel engine with mechanical fuel injection system

Emission and performance characteristics of CRDI diesel engine using Quadruple injection strategy with different pilots and post injection timing

Time-frequency analysis application to the evaluation of instantaneous combustion noise

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