Autoignition characteristics of diesel spray under different injection pressures and cold start strategy for compression ignition engines

Yang, Ziming; Liu, Fushui; Li, Yikai

doi:10.1177/1468087420934601

Cited by 12 publications

(5 citation statements)

References 65 publications

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“…According to the study of Mohan et al [62], enhanced fuel atomization and lower HC, CO, and PM emissions could be achieved by increasing the injection pressure from diesel engines during cold start conditions. Through experiments in a constant volume combustion chamber (CVCC), Yang et al [63] demonstrated that injection pressure and flames can be successfully controlled with a slower start-up speed and a cool intake temperature.…”

Section: Injection Optimizationmentioning

confidence: 99%

Strategies to Reduce Emissions from Diesel Engines under Cold Start Conditions: A Review

Zhang

Huang

et al. 2023

Energies

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Reducing diesel engine emissions under cold start conditions has become much more valuable as environmental issues become more important. Regarding diesel engine emissions under cold start conditions, this review summarizes the emission mechanisms and specifically focuses on the research progress of four reduction strategies: biodiesel utilization, intake heating, injection optimization, and aftertreatment technologies. In general, adding biodiesel and Di-Ethyl-Ether (DEE) could provide the benefit of reducing emissions and maintaining engine performance. Intake heating and appropriate injection strategies could also effectively reduce emissions under cold start conditions. Unlike normal operating conditions, lean nitrogen oxide traps (LNT) or electrically heated catalysts (EHC) should be utilized in the aftertreatment of diesel engines to minimize emissions under cold start conditions. By offering the valuable information above, this review could be a helpful reference in reduction strategies for diesel engines under cold start conditions in both academia and industry.

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Section: Injection Optimizationmentioning

confidence: 99%

Strategies to Reduce Emissions from Diesel Engines under Cold Start Conditions: A Review

Zhang

Huang

et al. 2023

Energies

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“…6 Yang et al studied spray autoignition characteristics under different injection pressures and cold start strategies for compression ignition engines. 7 Park et al studied the influence of temperature on the physical properties of the fuel, such as density, dynamic viscosity, and kinematic viscosity. 8 The influence of fuel temperature change on fuel properties is described when the injector temperature and fuel pipe temperature change from 0°C to 70°C.…”

Section: Introductionmentioning

confidence: 99%

“…Higher viscosity will slow down the spraying speed, breaking speed, and evaporation speed of the fuel spray 6 . Yang et al studied spray autoignition characteristics under different injection pressures and cold start strategies for compression ignition engines 7 . Park et al studied the influence of temperature on the physical properties of the fuel, such as density, dynamic viscosity, and kinematic viscosity 8 .…”

Section: Introductionmentioning

confidence: 99%

Fuel injection performance and spray characteristic of high‐pressure common rail systems at low temperatures

Ma,

Xu,

Liu

2024

Energy Science & Engineering

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The fuel injection performance and spray characteristics of the high‐pressure common rail (HPCR) system at low temperatures are investigated with experiment. The effects of environmental temperature, common rail pressure, and fuel injection pulse width on the injection quantity and spray characteristics are discussed. The fuel injection quantity at −30°C decreases by about 10% compared to the target fuel quantity. For the different target fuel quantity, the decrease of fuel injection quantity with temperature is the same under different rail pressures. The impact of temperature change on fuel injection quantity is relatively greater when the fuel injection pulse width is small. At the same common rail pressure and injector control pulse width, the injection quantity of −35# diesel is greater than that of −10# diesel for the same temperature condition. The low‐temperature fluidity can ensure normal diesel supply and injection in the fuel supply system. When the viscosity of diesel fuel rises and fluidity deteriorates in a low‐temperature environment, the spray beam produced by the same spray pressure becomes difficult to spread, and the spray penetration distance and cone angle decrease. The spray penetration distance differs by about 2.2 mm between the two temperatures. At low temperatures, the viscosity of diesel fuel rises and the fluidity deteriorates. The minimum injection pressure of the spray increases, and the spray angle is relatively small.

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“…Hence, in such operating conditions, it takes a longer time for the spray to overcome the barriers of the chemical reactions leading to a longer chemical delay. 19 Thus, it is extremely challenging to optimize the injection parameters to ensure an acceptable cold-start behavior with the LCR approach. Several measures like intake air heating, use of a glow plug, increase in cranking speed, multiple pilot injections, optimization of injection pressure, spray targeting, etc.…”

Section: Introductionmentioning

confidence: 99%

Novel strategies to overcome the limitations of a low compression ratio light duty diesel engine

Vikraman

Anand

Ramesh

2020

International Journal of Engine Research

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Low compression ratio (LCR) approach in diesel engines can reduce the oxides of nitrogen (NOx) and soot emissions simultaneously owing to lower temperatures and longer fuel-air premixing time. The present work investigates the effects of lowering the geometric compression ratio (CR) from 18:1 to 14:1 in a naturally aspirated (NA) single cylinder common rail direct injection (CRDI) diesel engine. Based on the investigations done across the entire speed and load range, significant benefits were observed in the NOx and soot emissions. However, lowering the compression ratio had adverse effects on brake specific fuel consumption (BSFC), unburned hydrocarbon (HC) and carbon monoxide (CO) emissions, especially at low-load and high-speed operating points. To overcome these limitations, novel strategies including split-cooling system (SCS) and secondary exhaust valve opening (SEVO) are proposed in the present work. While the fuel injection parameters optimization specific to LCR could help to improve the BSFC, HC and CO emissions penalty to a reasonable extent, the SCS concept can provide further benefits by reducing the heat loss to coolant and improving the engine component temperatures. Increasing the residual gas fraction using the optimized SEVO concept could further improve the charge temperature leading to a further reduction in the BSFC, HC and CO emissions. The net benefits of the optimized LCR approach are quantified for the modified Indian drive cycle (MIDC) using a one-dimensional simulation tool. The results obtained show a signification reduction of 22% and 74% in NOx and soot emissions respectively as compared to the base 18 CR engine results. Moreover, the penalty in HC and CO emissions could be contained to a large extent resulting in only a slight penalty of 23% and 20% respectively. Furthermore, the higher BSFC with the LCR approach could be successfully addressed and the final values were found to be better than the stock compression ratio by 1.5%. Overall, the strategies proposed in the present work are found to be beneficial to develop modern diesel engines in compliance with the future emission regulations which demand extreme control on NOx and soot emissions.

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Autoignition characteristics of diesel spray under different injection pressures and cold start strategy for compression ignition engines

Cited by 12 publications

References 65 publications

Strategies to Reduce Emissions from Diesel Engines under Cold Start Conditions: A Review

Strategies to Reduce Emissions from Diesel Engines under Cold Start Conditions: A Review

Fuel injection performance and spray characteristic of high‐pressure common rail systems at low temperatures

Novel strategies to overcome the limitations of a low compression ratio light duty diesel engine

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