Application of Miller cycle with turbocharger and ethanol to reduce NOx and particulates emissions from diesel engine – A numerical approach with model validations

Li, Chengqian; Wang, Yaodong; Jia, Boru; Roskilly, Anthony Paul

doi:10.1016/j.applthermaleng.2019.01.056

Cited by 36 publications

(18 citation statements)

References 14 publications

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“…It was concluded that in comparison to VVT engines, CVVL engines have greater potential for minimizing pumping loss at low-to-medium loads, and as the valve lift increases to a certain value, the downtrend of pumping loss becomes slower, approaching the theoretical lower limit. There are many ongoing studies exploring the positive outcomes of VVT and LIVC technologies in diesel engines [64][65][66]. Daimler proposed and patented an asymmetric turbocharger without mobile vane actuation, with more compact parts than the conventional variable-geometry turbocharger (VGT); it provides more effective turbocharging performance, with reduced pumping loss, and is able to drive the EGR rate up to 35% at full load on Detroit Diesel's HD platform [67].…”

Section: Technologies Of Pumping Loss Reductionmentioning

confidence: 99%

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

Wang

Shuai

et al. 2021

Energies

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Today, the problem of energy shortage and climate change has urgently motivated the development of research engaged in improving the fuel efficiency of internal combustion engines (ICEs). Although many constructive alternatives—including battery electric vehicles (BEVs) and low-carbon fuels such as biofuels or hydrogen—are being put forward, they are starting from a very low base, and still face significant barriers. Nevertheless, 85–90% of transport energy is still expected to come from combustion engines powered by conventional liquid fuels even by 2040. Therefore, intensive passion for the improvement of engine thermal efficiency and decreasing energy loss has driven the development of reliable approaches and modelling to fully understand the underlying mechanisms. In this paper, literature surveys are presented that investigate the relative advantages of technologies mainly focused on minimizing energy loss in engine assemblies, including pistons and rings, bearings and valves, water and oil pumps, and cooling systems. Implementations of energy loss reduction concepts in advanced engines are also evaluated against expectations of meeting greenhouse gas (GHG) emissions compliance in the years to come.

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Section: Technologies Of Pumping Loss Reductionmentioning

confidence: 99%

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

Wang

Shuai

et al. 2021

Energies

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“…The level of expansion determines the size of the intercoolers required. The increase in the temperature of the inlet gases, also increases the NO x emissions due to peak in-cylinder temperatures [12]. The longer length of the exhaust system also tends to increase the pressure loss in the system.…”

Section: Introductionmentioning

confidence: 99%

Design of the turbocharger bearing arrangement to increase the overall efficiency of the combustion engine

Sroka¹,

Prakash²,

Włostowski³

2022

Combustion Engines

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The main objective of this study was to design a journal bearing, such that it can withstand the forces that arise in context to increasing the length of the shaft in an automotive turbocharger. The work will also provide information on how the design changes affect the overall performance of the bearing. The design changes include the thickness of the oil film, the number of grooves, the dimension of the grooves, the number of inlets and outlets, the dimension of the babbitt and mainly the length of the journal bearing. The simulation models were created using CATIA V5 and the analysis is done using ANSYS 19.2. The flow is considered to be laminar and is calculated using Reynold’s Equation. The new concept gave insight on how the design considerations affect the pressure distribution and the pressure developed. From the results, it was interpreted that the new design can withstand the four times the pressure while distributing the pressure over twice the original design.

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“…However, high boost and compression ratio lead to the increase in in-cylinder temperature and the knocking combustion has become the significant obstacle to limit the increase in the thermal efficiency of gasoline engine. 1 Therefore, various methods are proposed to suppress knock, such as retarded ignition timing, 2 Miller cycle, 3,4 exhaust gas recirculation (EGR), 5 mixture enrichment, 6 and alternative fuels. 7,8 It is found that mixing high octane fuels, such as methanol, ethanol, and so on, 9,10 in gasoline is of significance in suppressing knock.…”

Section: Introductionmentioning

confidence: 99%

Effects of the injection timing on knock and combustion characteristics in dual-fuel dual-injection engines

Liu

Kang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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To utilize ethanol fuel in spark ignition engines more efficiently and flexibly, a new ethanol/gasoline dual-direct injection concept in gasoline engine is proposed. Therefore, based on the dual-fuel dual-direct injection system, the effects of different injection timings and two injector positions on the characteristics of combustion were studied comprehensively, and the effects of different octane numbers and temperature stratifications on knock and combustion were explored. The results show that as for Position A (ethanol injecting toward spark plug), with the delay of injection timing, knock tendency and its intensity increase initially and then decrease due to the comprehensive effect of ethanol evaporation and fuel stratification; on the contrary, for Position B (ethanol injecting toward end-gas region), retarding the injection timing of ethanol can effectively reduce the knock propensity. As for the engine performance, a dual-direct injection performs best, especially the retarded injection timing of ethanol for Position A. It can be found that with the delay of the fuel injection timing, the torque first increases and then decreases. The brake-specific fuel consumption decreases initially and then increases at maximum brake torque spark timing.

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Application of Miller cycle with turbocharger and ethanol to reduce NOx and particulates emissions from diesel engine – A numerical approach with model validations

Cited by 36 publications

References 14 publications

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

A Review of Energy Loss Reduction Technologies for Internal Combustion Engines to Improve Brake Thermal Efficiency

Design of the turbocharger bearing arrangement to increase the overall efficiency of the combustion engine

Effects of the injection timing on knock and combustion characteristics in dual-fuel dual-injection engines

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