Development of a Transfer Port Injection System for Two-Stroke Engines

Tan, Yee Hern; Gitano, Horizon; Khalil, Ahmad Syazli Mohd

doi:10.4271/2012-32-0115

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…However, today they are not so popular because of their high exhaust emissions. Gasoline direct injection (GDI) is a new technology which is capable of reducing exhaust emissions and fuel short-circuiting greatly [1]. The GDI engines are mainly governed by fuel-air mixing and charge stratification, which in-turn depends on in-cylinder flow behavior.…”

Section: Introductionmentioning

confidence: 99%

Effect of Piston Shape on Scavenging in a Two-Stroke Engine - A CFD Analysis

Agrawal

Mallikarjuna

2014

AMM

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This study focuses on effect of piston shape on in-cylinder flows in a conventional loop scavenged two-stroke engine using CFD. Three piston-shapes viz., flat, flat with center-bowl and flat with center-dome are analyzed along with standard piston. The CFD solution has been obtained by using commercial code STAR-CD. First the CFD results are compared with those of experimental values obtained from particle image velocimetry (PIV). For comparison among various piston shapes, various parameters viz., velocity vector plots, tumble ratio (TR), turbulent kinetic energy (TKE) at various crank angles are used. Scavenging and trapping efficiencies are also calculated for each piston configuration. From the results, it is found that flat with center-bowl piston is the best in terms of in-cylinder flow characteristics. It gives higher TR and TKE with very little effect on efficiencies.

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Section: Introductionmentioning

confidence: 99%

Effect of Piston Shape on Scavenging in a Two-Stroke Engine - A CFD Analysis

Agrawal

Mallikarjuna

2014

AMM

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“…A similar Husqvarna version of the 250 cc fuel injected dirt bike was made slightly prior in 2018 which boasts 30-40% improvement in fuel economy over the traditional carbureted model[47]. Studies conducted on TPI of liquefied petroleum gas (LPG) also showed considerable reductions in emission output; the conversion from carbureted to TPI resulted in a 87.6% reduction in CO, 59.3% reduction in HC, and combined reduction of 80% CO+HC[48].Other LPDI research showed the impact of injection window on engine performance. It was shown that staged injections resulted in more stable combustion[49].…”

mentioning

confidence: 99%

Experimental Design, Testing, and Evaluation of Methods to Improve the Efficiency and Reduce Emissions from a Small Two-stroke Natural Gas Engine

Ulishney¹

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Decentralized power generation is a research area of interest due to possible improvements in electrical generation efficiency and grid resilience. Two-stroke engines are simple, inexpensive, power dense systems that could serve as the prime-movers for combined heat and power (CHP) systems. In addition, such systems could be fueled on natural gas (NG) that is readily available to serve as a reliable fuel source in most households. However, most two-stroke engines are inefficient and produce excessive emissions. This research focused on methods to simultaneously improve engine efficiency and decrease emissions from a 34 cc air-cooled, two-stroke engine retrofitted to operate on NG. The engine type and size were selected for decentralized household power generation at the 1-kilowatt (kW) level. The engine utilized resonant intake and exhaust systems designed for operation at a fixed frequency of 90 Hz (5400 RPM) using Helmholtz resonance theory. Testing was conducted at wide open throttle (WOT) with electronic injection timing and ignition timing set for maximum brake torque (MBT). Two different fueling strategies and two variations in resonant exhaust systems were examined. The engine was first tested with port injection (PI) of NG with a near optimum baseline exhaust, then using low pressure direct injection (LPDI) with the near optimum exhaust, and finally with LPDI and an optimized resonant exhaust. Maximum indicated efficiency was 31.2% for the optimized LPDI system. Using PI as a baseline, LPDI increased efficiency by a relative 81% and 70% for the optimized and near optimum exhausts, respectively. Brake specific fuel consumption (BSFC) decreased by 33% and 32%, while indicated power increased by 46% and 25%, respectively. Emission levels met EPA standards for non-methane hydrocarbon plus nitrogen oxides (NMHC+NOx) and carbonmonoxide (CO) under all test configurations. At the most efficient points LPDI operation decreased NMHC+NOx by 46% for both exhausts as compared to PI, while CO increased under LPDI. This research validates that a resonance tuned, LPDI, NG, two-stroke engine could be incorporated into an emissions compliant decentralized power generation system with high efficiency at the 1 kW level. The findings will support future efforts in designing efficient, economically competitive, and clean CHP systems. I would like to thank Dr. Thompson for having selected me as an undergraduate applied thermodynamics grader, since this position led me on a direct path for graduate school. I would also like to thank Dr. Thompson for his recommending me to the new thermodynamics instructor, Dr. Derek Johnson. My utmost thanks go to Dr. Johnson for all his efforts in taking me under his wing as a new graduate student and aiming me toward success. Dr. Johnson orchestrated the engine team research, aiding in selection of components, designs, and technologies used for engine efficiency improvement. I would like to thank all the members of the WVU ARPA-E GENSETS project. Mehar Bade performed engine simulation and assi...

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Scavenging simulation of small two-stroke engine with low-pressure fuel injection for usage in unmanned aerial vehicle (UAV)

Klepac

Rozehnal

2017

2017 International Conference on Military Technologies (ICMT)

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Development of a Transfer Port Injection System for Two-Stroke Engines

Cited by 3 publications

References 2 publications

Effect of Piston Shape on Scavenging in a Two-Stroke Engine - A CFD Analysis

Effect of Piston Shape on Scavenging in a Two-Stroke Engine - A CFD Analysis

Experimental Design, Testing, and Evaluation of Methods to Improve the Efficiency and Reduce Emissions from a Small Two-stroke Natural Gas Engine

Scavenging simulation of small two-stroke engine with low-pressure fuel injection for usage in unmanned aerial vehicle (UAV)

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