Efficiency of an Otto engine under alternative power optimizations

Gümüş, Metin; Atmaca, Mustafa; Yılmaz, Tamer

doi:10.1002/er.1515

Cited by 23 publications

(10 citation statements)

References 28 publications

(33 reference statements)

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“…The optimal r value at maximum P ME can also be found numerically by using Eq. (22). It is obvious from Fig.…”

Section: Resultsmentioning

confidence: 91%

“…Gumus et al [22] has performed a comparative performance analysis for a reversible Otto cycle based on three alternative performance criteria namely maximum power (mp), maximum power density (mpd) and maximum efficient power (mep). They defined the power density criterion as the power per minimum specific volume in the cycle and the efficient power criterion as multiplication of the power by the efficiency of the Otto cycle.…”

Section: Introductionmentioning

confidence: 99%

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The Effects of Cycle Temperature and Cycle Pressure Ratios on the Performance of an Irreversible Otto Cycle

2011

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This paper reports the thermodynamic optimization based on the maximum mean effective pressure, maximum power and maximum thermal efficiency criteria for an irreversible Otto heat engine model which includes internal irreversibility resulting from the adiabatic processes. The mean effective pressure, power output, and thermal efficiency are obtained by introducing the compression ratio, cycle temperature ratio, specific heat ratio and the compression and expansion efficiencies. Optimal performance and design parameters of the Otto cycle are obtained analytically for the maximum power and maximum thermal efficiency conditions and numerically for the maximum mean effective pressure conditions. The results at maximum mean effective pressure conditions are compared with those results obtained by using the maximum power and maximum thermal efficiency criteria. The effects of the cycle temperature ratio and cycle pressure ratio on the general and optimal performances are investigated.

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“…The optimal r value at maximum P ME can also be found numerically by using Eq. (22). It is obvious from Fig.…”

Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

The Effects of Cycle Temperature and Cycle Pressure Ratios on the Performance of an Irreversible Otto Cycle

2011

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“…The main OPBs used in ICE cycles analysis and optimization include power (work) and efficiency [74][75][76], power density [77], effective power [78], EF [79][80][81][82][83][84], ecological coefficient of performance (ECOP) [85] and so on. (2)…”

Section: The Study Featuresmentioning

confidence: 99%

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

Chen

Sun

2016

Entropy

138

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Abstract:On the basis of introducing the origin and development of finite time thermodynamics (FTT), this paper reviews the progress in FTT optimization for internal combustion engine (ICE) cycles from the following four aspects: the studies on the optimum performances of air standard endoreversible (with only the irreversibility of heat resistance) and irreversible ICE cycles, including Otto, Diesel, Atkinson, Brayton, Dual, Miller, Porous Medium and Universal cycles with constant specific heats, variable specific heats, and variable specific ratio of the conventional and quantum working fluids (WFs); the studies on the optimum piston motion (OPM) trajectories of ICE cycles, including Otto and Diesel cycles with Newtonian and other heat transfer laws; the studies on the performance limits of ICE cycles with non-uniform WF with Newtonian and other heat transfer laws; as well as the studies on the performance simulation of ICE cycles. In the studies, the optimization objectives include work, power, power density, efficiency, entropy generation rate, ecological function, and so on. The further direction for the studies is explored.

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“…The power density defined as the power per minimum specific volume in the cycle then takes the form [17]: In order to write eqs. The power density defined as the power per minimum specific volume in the cycle then takes the form [17]: In order to write eqs.…”

Section: Cycle Analysismentioning

confidence: 99%

Comparative thermodynamic analysis of dual cycle under alternative conditions

Atmaca¹,

Gümüş²,

Demir³

2011

THERM SCI

Self Cite

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In this paper, finite-time thermodynamic analysis of an air-standard internal-combustion Dual cycle is performed. Maximum power (MP), maximum power density (MPD), maximum efficient power (MEP) which are three alternative performance criteria are derived. The effects of the design parameters such as volume ratio and extreme temperature ratio of the cycle have been investigated under MP, MPD and MEP conditions. The analyzed results of air-standard internal-combustion Dual cycle showed the design parameters at maximum power (MP) conditions and maximum efficient power (MEP) conditions have a significant advantage compared to maximum power density (MPD) criterion

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Efficiency of an Otto engine under alternative power optimizations

Cited by 23 publications

References 28 publications

The Effects of Cycle Temperature and Cycle Pressure Ratios on the Performance of an Irreversible Otto Cycle

The Effects of Cycle Temperature and Cycle Pressure Ratios on the Performance of an Irreversible Otto Cycle

Progress in Finite Time Thermodynamic Studies for Internal Combustion Engine Cycles

Comparative thermodynamic analysis of dual cycle under alternative conditions

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