Efficiency improvement of a spark-ignition engine at full load conditions using exhaust gas recirculation and variable geometry turbocharger – Numerical study

Sjerić, Momir; Taritaš, Ivan; Tomić, Rudolf; Blažić, Mislav; Kozarac, Darko; Lulić, Zoran

doi:10.1016/j.enconman.2016.02.047

Cited by 30 publications

(10 citation statements)

References 18 publications

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“…with the same content of N2, it can be seen that the densely distributed area of the mapping points moves to the lower part of the graph, indicating that CO2 has a stronger inhibitory effect on the combustion rate than N2, and the cylinder pressure and pressure rise rate drop significantly; when shale gas contains 20% CO2, the distribution range of scattered points is about 1.3～3.2MPa and 0.03～0.10MPa/°CA -1 , the non-periodical combustion cycle is further enhanced, and the working stability is weakened. The average indicated pressure comprehensively characterizes the pressure fluctuations of the entire cycle, and is closely related to the output power of the engine, and is an important indicator for studying engine cycle fluctuations [41][42][43]. Fig.…”

Section: Phase Space Analysismentioning

confidence: 99%

Nonlinear Dynamic Analysis of Shale Gas Engine Combustion Stability

Liu

Zhang

Zhong

et al. 2021

Preprint

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The traditional analysis method of engine combustion cycle variation is a statistical method based on a small amount of data. In essence, the obtained cycle variation is random data. In order to reveal the dynamic nature of the cyclical changes during the combustion of a shale gas engine, a nonlinear dynamics method was used to study the stability of the combustion process. The motion law of the phase space trajectory is analyzed, the influence of the shale gas composition on the trajectory distribution is analyzed, the return mapping point of the average indicated pressure in the cylinder is discussed. The relationship between adjacent combustion characteristic parameters is studied; the chaotic characteristics of the shale gas engine combustion process are discussed. The results show that during the working process of the shale gas engine, the in-cylinder pressure shows a similar quasi-periodic state in the entire phase space, and the working process has a certain chaotic law; with the increase of the CH4, N2 and CO2 content in the shale gas, the combustion cycle variation increases, and the randomness of the engine working process increases. The phase space trajectory shows a monotonously increasing distribution of Poincaré mapping points on the ∑XY+ section. With the increase of the combustion cycle, the linear relationship of the scattered points gradually increases, and the randomness of the combustion process increases. The return map points of the engine combustion characteristic parameters are distributed in a cluster. When the CH4 content increases, the distribution range of the average indicated pressure return map points increases. With the increase of N2 and CO2 content, abnormal combustion phenomena such as partial combustion or misfire occur during the engine combustion process, the uncertainty of the combustion process increases, and the combustion stability decreases. With the increase of engine speed, the correlation dimension and the maximum Lyapunov exponent increase, the randomness of the combustion process increases, and the chaotic characteristics of the engine working process are obvious; the time series of the cylinder pressure is more sensitive to the content of inert gas. With the increase of N2 and CO2 content in the gas, the correlation dimension and the maximum Lyapunov exponent increase significantly, the complexity of the phase space trajectory increases, and the chaotic characteristics become more obvious.

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Section: Phase Space Analysismentioning

confidence: 99%

Nonlinear Dynamic Analysis of Shale Gas Engine Combustion Stability

Liu

Zhang

Zhong

et al. 2021

Preprint

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“…The authors found excellent results both in terms of performance and emissions. Gas recirculation in diesel engines was also investigated in several other papers [94,95].…”

Section: Advanced Combustion Techniques and Fuelsmentioning

confidence: 99%

Recent Advances in the Analysis of Sustainable Energy Systems

et al. 2018

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EU energy policy is more and more promoting a resilient, efficient and sustainable energy system. Several agreements have been signed in the last few months that set ambitious goals in terms of energy efficiency and emission reductions and to reduce the energy consumption in buildings. These actions are expected to fulfill the goals negotiated at the Paris Agreement in 2015. The successful development of this ambitious energy policy needs to be supported by scientific knowledge: a huge effort must be made in order to develop more efficient energy conversion technologies based both on renewables and fossil fuels. Similarly, researchers are also expected to work on the integration of conventional and novel systems, also taking into account the needs for the management of the novel energy systems in terms of energy storage and devices management. Therefore, a multi-disciplinary approach is required in order to achieve these goals. To ensure that the scientists belonging to the different disciplines are aware of the scientific progress in the other research areas, specific Conferences are periodically organized. One of the most popular conferences in this area is the Sustainable Development of Energy, Water and Environment Systems (SDEWES) Series Conference. The 12th Sustainable Development of Energy, Water and Environment Systems Conference was recently held in Dubrovnik, Croatia. The present Special Issue of Energies, specifically dedicated to the 12th SDEWES Conference, is focused on five main fields: energy policy and energy efficiency in smart energy systems, polygeneration and district heating, advanced combustion techniques and fuels, biomass and building efficiency.

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“…The heat distribution in the turbocharger is not uniform, 8 which causes much thermal tension on its body. 9 The turbochargers of diesel engines are generally cooled by the flow of oil and air around the bearings housing, 10 but in the turbochargers of spark ignition engines the exhaust gas temperatures are much higher and values of 1050°C is observed in some cases.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on the heat transfer of an automotive engine’s turbocharger

Basir

Gharehghani

Ahmadi

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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Measuring the temperature distribution in a complex and important engine part, such as a turbocharger, is essential for improving engine performance and efficiency. Heat transfer from the turbine to the compressor can strongly influence the turbocharger performance. One of the main measurement methods involves the installation of multiple K-type sensors. However, the location as well as the maximum and minimum temperatures of the turbocharger and the subsequent critical points may not be obtained by using sensors. In the current study, thermocouples, as well as an infra-red camera, are used to study the temperature distribution of the turbocharger housing in a spark ignition engine. A new method is introduced to determine the thermal radiation coefficient of the turbocharger housing by using a laboratory furnace and an infra-red camera. Together with experiments, the finite element method is used to find the temperature distribution in the turbocharger for all thicknesses. Comparing the temperature distribution obtained from simulation with experimental data, an acceptable level of agreement is observed. The location and temperature of the hottest area in experimental and numerical investigations are close to the waste gate. Temperatures using the finite element method for bearings exhibit maximum and minimum errors of 4.9% and 2.3%, respectively, indicating reasonable accuracy for the simulation.

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Efficiency improvement of a spark-ignition engine at full load conditions using exhaust gas recirculation and variable geometry turbocharger – Numerical study

Cited by 30 publications

References 18 publications

Nonlinear Dynamic Analysis of Shale Gas Engine Combustion Stability

Nonlinear Dynamic Analysis of Shale Gas Engine Combustion Stability

Recent Advances in the Analysis of Sustainable Energy Systems

Experimental and numerical investigation on the heat transfer of an automotive engine’s turbocharger

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