JP Journal of Heat and Mass Transfer
Volume 14, Issue 2, Pages 201 - 218
(May 2017) http://dx.doi.org/10.17654/HM014020201 |
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ON THE PERFORMANCE OF SIX-STROKE SINGLE-POWER COMBUSTION ENGINE
E. Siswanto, D. Widhiyanuriyawan, A. S. Widodo, N. Hamidi, D. B. Darmadi and Sudjito
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Abstract: This paper presents a precursor study on the performance of gasoline based six-stroke single-power internal combustion engine (ICE) using the concept of addition of two diffusion-mixing strokes before combusting air-fuel mixture. Toward a conventional four-stroke, the additional two strokes are to extend the duration of both mixing and diffusing. There are two different types of diffusion: mass and thermal. Mass diffusion means to massively diffuse fuel to air, while thermal diffusion means the diffusion of thermal energy through the cylinder wall to the mixture of the air and the fuel. Besides informing the performance of the six-stroke engine, this study also reports the performances of a conventional four-stroke engine with the same in-cylinder capacity, i.e., 125cc. Local atmospheric condition of observation is on relative humidity of about 76% rH, also ambient temperature and pressure are about 24°C and 101.32kPa, respectively. By setting 33% throttle position of carburetor, the performances of both the engines are observed. Under the same rotation of the crankshaft, 4500 rpm to 6500 rpm, the six-stroke engine shows more effective power of 10% higher than the four-stroke engine. This means that the power density of the six-stroke engine is higher than that of the four-stroke engine. As predicted in ideal thermodynamics model, the wider area on Otto cycle of six-stroke engine is due to the higher heat input into the cycle. |
Keywords and phrases: six-stroke combustion engine, diffusion-mixing, power density. |
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