Parameter Optimization on the Uniflow Scavenging System of an OP2S-GDI Engine Based on Indicated Mean Effective Pressure (IMEP)

Ma, Fukang; Wang, Jun; Feng, Yaonan; Zhang, Yangang; Tie-xiong, SU; Zhang, Yi; Liu, Yu‐Hang

doi:10.3390/en10030368

Cited by 19 publications

(11 citation statements)

References 29 publications

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“…The essential of IMEP parameters has also been studied by several researchers in some other related topics [18], [20], [21]. These studies show the needs of IMEP assessment in determining engine performance characteristics.…”

Section: Effective Pressure and Indicated Meanmentioning

confidence: 94%

“…Unlike the torque, the IMEP does not depend on the engine speed and engine size, which makes it more useful to compare engines. Even, the IMEP can be considered as one of the optimization aspects in an internal combustion engine [18]. The IMEP is used to compute the resistant momentum, which in turn is used to calculate the resistant work and the shaft work.…”

Section: Indicated Mean Effective Pressure (Imep)mentioning

confidence: 99%

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Influence of Compression Ratio on Flywheel Dimension for a Naturally Aspirated Spark Ignition Engine: A Numerical Study

Yudianto

2020

Automot. Exp.

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The proper design of the flywheel undeniably determines in tuning the engine to confirm the better output engine performance. The aim of this study is to mathematically investigate the effect of various values of the compression ratio on some essential parameters to determine the appropriate value for the flywheel dimension. A numerical calculation approach was proposed to eventually determine the dimension of the engine flywheel on a five-cylinder four-stroke Spark Ignition (SI) engine. The various compression ratios of 8.5, 9, 9.5, 10, 10.5, and 11 were selected to perform the calculations. The effects of compression ratio on effective pressure, indicated mean effective pressure (IMEP), dynamic irregularity value of the crankshaft, and the diameter of the flywheel was clearly investigated. The study found that 2.5 increment value of the compression ratio significantly increases the effective pressure of about 41.53% on the starting of the expansion stroke. While at the end of the compression stroke, the rise of effective pressure is about 76.67%, and the changes in dynamic irregularity merely increase by about 1.79%. The same trend applies to the flywheel diameter and width, which increases 2.08% for both.

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Section: Effective Pressure and Indicated Meanmentioning

confidence: 94%

Section: Indicated Mean Effective Pressure (Imep)mentioning

confidence: 99%

Influence of Compression Ratio on Flywheel Dimension for a Naturally Aspirated Spark Ignition Engine: A Numerical Study

Yudianto

2020

Automot. Exp.

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“…With regard to the initial prototype engine, the unique gas exchange process features prominently in its working principle. As shown in Figure 4, the complete gas exchange process can be roughly divided into three phases including free exhaust phase, forced scavenging phase, and final exhaust phase [31,32]. The expansion stroke of the initial prototype engine gradually draws to a close as the piston descends from the TDC.…”

Section: Working Principle Of the Initial Prototype Enginementioning

confidence: 99%

Investigation on the Performance Characteristics of 2-Stroke Heavy Fuel Light Aeroengine (2SHFLA) with Different Fuel Injection Systems: Modeling and Comparative Simulation

Qiao

Zhong

et al. 2020

Energies

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Extensive application of small and medium-sized unmanned aerial vehicles (UAVs) have already made the development of corresponding power system a research hotspot nowadays. Two-stroke heavy fuel light aeroengine (2SHFLA) is selected as the research focus in this paper. The working principle of 2SHFLA with different fuel injection systems is elaborated systematically. By dividing the initial prototype engine into several subsystems, the simulation platform is set up with its key model parameters accurately calibrated against the test data. Simulation platforms of the other two types of engines are subsequently constructed based on the pre-calibrated simulation platform of the initial prototype engine. Afterwards, comparative simulation is performed and the corresponding simulation results include: (1) comparison of performance characteristics of the initial prototype engine fueled with regular gasoline/heavy fuel; (2) comprehensive comparison of the performance characteristics of all the three types of engine.

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“…Scavenging efficiency, η S , is of vital importance toward the gas exchange quality of the scavenging process because η S indicates to what extent the residual burned gases in the cylinder have been replaced with fresh mixture after the end of the scavenging process [28]. The higher the η S value, the more sufficient the fresh charge intake and the greater the improvements of power performance enhancement.…”

Section: Scavenging Model Selectionmentioning

confidence: 99%

“…The first three parameters are defined as shown in Figure 10. The width ratio of the central scavenging port, γ C , describes the proportion of the mass flow entering the cylinder through the central scavenging port and is given by the following equation [28]:…”

Section: Optimal Design Determinantsmentioning

confidence: 99%

Scavenging Ports’ Optimal Design of a Two-Stroke Small Aeroengine Based on the Benson/Bradham Model

et al. 2018

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The two-stroke engine is a common power source for small and medium-sized unmanned aerial vehicles (UAV), which has wide civil and military applications. To improve the engine performance, we chose a prototype two-stroke small areoengine, and optimized the geometric parameters of the scavenging ports by performing one-dimensional (1D) and three-dimensional (3D) computational fluid dynamics (CFD) coupling simulations. The prototype engine is tested on a dynamometer to measure in-cylinder pressure curves, as a reference for subsequent simulations. A GT Power simulation model is established and validated against experimental data to provide initial conditions and boundary conditions for the subsequent AVL FIRE simulations. Four parameters are considered as optimal design factors in this research: Tilt angle of the central scavenging port, tilt angle of lateral scavenging ports, slip angle of lateral scavenging ports, and width ratio of the central scavenging port. An evaluation objective function based on the Benson/Bradham model is selected as the optimization goal. Two different operating conditions, including the take-off and cruise of the UAV are considered. The results include: (1) Orthogonal experiments are analyzed, and the significance of parameters are discussed; (2) the best factors combination is concluded, followed by simulation verification; (3) results before and after optimization are compared in details, including specific scavenging indexes (delivery ratio, trapping efficiency, scavenging efficiency, etc.), conventional performance indicators, and the sectional views of gas composition distribution inside the cylinder.

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Parameter Optimization on the Uniflow Scavenging System of an OP2S-GDI Engine Based on Indicated Mean Effective Pressure (IMEP)

Cited by 19 publications

References 29 publications

Influence of Compression Ratio on Flywheel Dimension for a Naturally Aspirated Spark Ignition Engine: A Numerical Study

Influence of Compression Ratio on Flywheel Dimension for a Naturally Aspirated Spark Ignition Engine: A Numerical Study

Investigation on the Performance Characteristics of 2-Stroke Heavy Fuel Light Aeroengine (2SHFLA) with Different Fuel Injection Systems: Modeling and Comparative Simulation

Scavenging Ports’ Optimal Design of a Two-Stroke Small Aeroengine Based on the Benson/Bradham Model

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