Application of the Miller cycle to reduce NOx emissions from petrol engines

Wang, Yaodong; Lin, Lin; Sheng-chuo, Zeng; Huang, Jie; Roskilly, Anthony Paul; He, Yan; Huang, Xiaodong; Li, Shanping

doi:10.1016/j.apenergy.2007.10.009

Cited by 55 publications

(19 citation statements)

References 7 publications

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“…Gonca et al [ 1 – 5 ] showed that the Miller cycle diesel engine is more advantageous than conventional diesel engine in terms of NO emissions and effective efficiency depending on numerical studies. Wang et al experimentally [ 6 ] and analytically [ 7 ] implemented the Miller cycle into a petrol engine in order to decrease the NO x emissions. Mikalsen et al [ 8 ] applied the Miller cycle into an Otto cycle natural gas engine and the SFC and power output of the engine decreased.…”

Section: Introductionmentioning

confidence: 99%

Performance Optimization of an Air-Standard Irreversible Dual-Atkinson Cycle Engine Based on the Ecological Coefficient of Performance Criterion

Gonca

Şahi̇n

2014

The Scientific World Journal

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This paper presents an ecological performance analysis and optimization for an air-standard irreversible Dual-Atkinson cycle (DAC) based on the ecological coefficient of performance (ECOP) criterion which includes internal irreversibilities, heat leak, and finite-rate of heat transfer. A comprehensive numerical analysis has been realized so as to investigate the global and optimal performances of the cycle. The results obtained based on the ECOP criterion are compared with a different ecological function which is named as the ecologic objective-function and with the maximum power output conditions. The results have been attained introducing the compression ratio, cut-off ratio, pressure ratio, Atkinson cycle ratio, source temperature ratio, and internal irreversibility parameter. The change of cycle performance with respect to these parameters is investigated and graphically presented.

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Section: Introductionmentioning

confidence: 99%

Performance Optimization of an Air-Standard Irreversible Dual-Atkinson Cycle Engine Based on the Ecological Coefficient of Performance Criterion

Gonca

Şahi̇n

2014

The Scientific World Journal

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“…Wang et al [11][12][13] performed a series of works on the application of the MC into diesel engines 11 and petrol engines. 12,13 The results of the works demonstrated that reduction of NO x is higher than 40% in comparison with the standard condition. Mikalsen et al 14 analyzed the performance specifications of combined system including natural gas engine running with the MC.…”

Section: Introductionmentioning

confidence: 99%

“…Wang and Ruxton applied the MC to diminish NO x formation at higher rates and obtained more environmentally friendly engine operation conditions. Wang et al performed a series of works on the application of the MC into diesel engines and petrol engines . The results of the works demonstrated that reduction of NO x is higher than 40% in comparison with the standard condition.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a novel eco‐friendly internal combustion engine cycle

Gonca

Şahi̇n

2019

Int J Energy Res

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Summary The Miller cycle applications have been performed to diminish NOx released from internal combustion engines (ICEs), in recent years. The Miller cycle provides decreased compression ratio and enhanced expansion ratio; hereby, maximum in‐cylinder combustion temperatures diminish, and NOx formations slow down remarkably. Another less‐known method is Takemura cycle application, which provides heat addition into engine cylinder at constant combustion temperatures. In this study, a novel cycle including the Miller cycle and the Takemura cycle has been developed by using novel numerical models and computing methods with seven processes and a novel way to decrease NOx emissions at higher levels compared with the single applications of known cycles. A comprehensive performance examination of the proposed cycle engine in terms of performance characteristics such as effective power (EFP), effective power density (EFPD), exergy destruction (X), exergy efficiency (ε), and ecological coefficient of performance (ECOP) has been conducted. The impacts of engine operating and design parameters on the performance characteristics have been computationally examined. Furthermore, irreversibilities depending on incomplete combustion loss (INCL), exhaust output loss (EXOL), heat transfer loss (HTRL), and friction loss (FRL) have been considered in the performance simulations. The minimum exergy destruction and maximum performance specifications have been observed with 30 of the compression ratio. Maximum effective power values have been obtained at range between 1 and 1.2 of equivalence ratio. The optimum range for exergy efficiency is between 0.8 and 1 of equivalence ratio. Increasing engine speed has provided enhancing effective power. However, an optimum range has been found for the exergy efficiency that is interval of 3000 to 4000 rpm. The results obtained can be assessed by researchers studying on modeling of the engine systems and designs.

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“…Harmful exhaust emissions from internal combustion engines not only damage human health but also cause global warming. There are many studies carried out in the internal combustion engines to reduce fuel consumption and exhaust emissions [1][2][3][4]5]. Thermal efficiencies of Otto cycle engines are increased by increasing the compression ratio.…”

Section: Introductionmentioning

confidence: 99%

Performance and Emission Characteristics of a Miller Cycle Engine

Demirci¹,

Uyumaz²,

Sarıdemir³

et al. 2018

International Journal of Automotive Engineering and Technologies

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In this study, intake and exhaust cams were designed to perform the late intake valve closing (LIVC) Miller cycle operation (MA and MB cycles) using spline functions in a single-cylinder, four-stroke, spark-ignition (SI) engine. A special camshaft was manufactured and adapted to the engine to adjust valve opening and closing timings. The experiments were conducted at two different Miller cycle operation and the results were compared with Otto cycle. The tests were conducted between 1700-3200 rpm engine speed range at wide open throttle (WOT). In the experiments, the variation of brake torque, power output, specific fuel consumption (SFC), thermal efficiency, HC, CO, NOx emissions and exhaust gas temperature versus engine speed were investigated. More power output was obtained with Otto cycle than Miller cycles for all engine speeds. Brake torque and engine power decreased by 5.24%, and 1.17% respectively with MA cycle compared to Otto cycle at 2600 rpm engine speed. Thermal efficiency increased by 1.29%, while the SFC decreased 2.08 % with Otto cycle in comparison with MA cycle at maximum brake torque speed. HC and CO emissions increased by 6.48% and 11.66%, respectively with MA cycle compared to Otto cycle at the same operation condition. NOx emissions decreased up to 7.79% with MA cycle compared to Otto cycle due to the lower exhaust gas temperature at maximum brake torque engine speed of 2600 rpm.

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Application of the Miller cycle to reduce NOx emissions from petrol engines

Cited by 55 publications

References 7 publications

Performance Optimization of an Air-Standard Irreversible Dual-Atkinson Cycle Engine Based on the Ecological Coefficient of Performance Criterion

Performance Optimization of an Air-Standard Irreversible Dual-Atkinson Cycle Engine Based on the Ecological Coefficient of Performance Criterion

Performance analysis of a novel eco‐friendly internal combustion engine cycle

Performance and Emission Characteristics of a Miller Cycle Engine

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