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

Üst, Yasin; Şahi̇n, Bahri̇; Safa, Aykut

doi:10.12693/aphyspola.120.412

Cited by 23 publications

(15 citation statements)

References 21 publications

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“…For the isentropic compression process (1-2 t ) and isentropic expansion process (3-4 t ) are written the following equations: The investigation is focused on reversible and irreversible processes, thus it is requested the definition of the compression and expansion efficiencies, which describe the internal irreversibilities of the adiabatic processes [6]):…”

Section: Constant Specific Heat Casementioning

confidence: 99%

“…The investigation is focused on reversible and irreversible processes, thus it is requested the definition of the compression and expansion efficiencies, which describe the internal irreversibilities of the adiabatic processes [6]): Above, Φ is the equivalence ratio and "s" refers to stoichiometric conditions. where R air -characteristic gas constant of air.…”

Section: Constant Specific Heat Casementioning

confidence: 99%

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A point of view on Otto cycle approach specific for an undergraduate thermodynamics course in CMU

Memet

Preda

2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. This paper refers to the description of the way in which can be presented to future marine engineers the analyzis of the performance of an Otto cycle, in a manner which is beyond the classic approach of the course of thermodynamics in Constanta Maritime University. The conventional course of thermodynamics is dealing with the topic of performance analysis of the cycle of the internal combustion engine with isochoric combustion for the situation in which the working medium is treated as such a perfect gas. This type of approach is viable only when are considered relatively small temperature differences. But this is the situation when specific heats are seen as constant. Instead, the practical experience has shown that small temperature differences are not viable, resulting the need for variable specific heat evaluation. The presentation bellow is available for the adiabatic exponent written as a liniar function depending on temperature. In the section of this paper dedicated to methods and materials, the situation in which the specific heat is taken as constant is not neglected, additionaly being given the algorithm for variable specific heat.For the both cases it is given the way in which it is assessed the work output. The calculus is based on the cycle shown in temperature-entropy diagram, in which are also indicated the irreversible adiabatic compression and expansion. The experience achieved after understanding this theory will allow to future professionals to deal successfully with the design practice of internal combustion engines.

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Section: Constant Specific Heat Casementioning

confidence: 99%

Section: Constant Specific Heat Casementioning

confidence: 99%

A point of view on Otto cycle approach specific for an undergraduate thermodynamics course in CMU

Memet

Preda

2015

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Since nite-time thermodynamics [14] is a powerful tool for the performance analysis and optimization of real internal combustion engine cycle, much work has been performed for the performance analysis and optimization of nite time processes and nite size devices [5,6]. In 1940s, Miller [7] proposed a dierent Otto cycle with unequal compression and expansion stroke called the Miller cycle.…”

Section: Introductionmentioning

confidence: 99%

Power Optimization of a Miller Thermal Cycle with respect to Residual Gases and Equivalence Ratio

Ebrahimi

2013

Acta Phys. Pol. A

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The performance of an air standard Miller cycle is analyzed using nite-time thermodynamics. The relations between the power output and the compression ratio and between the power output and the thermal eciency are derived by detailed numerical examples. The results show that, throughout the compression ratio range, the power output decreases with increasing residual gases. The results also show that if compression ratio is less than certain value, the power output decreases with increasing equivalence ratio, while if compression ratio exceeds certain value, the power output rst increases and then starts to decrease with increasing equivalence ratio. The conclusions of this investigation are of importance when considering the designs of actual Miller engines.

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“…During a thermodynamic process, the more entropy generation is, the more the system would lose the ability of doing work by Ust et al [19] in 2011. With this consideration, the concept of entropy generation has been widely used to optimize or analyze thermodynamic processes for performance improvement [20,21].…”

Section: Introductionmentioning

confidence: 99%

Entransy Loss and its Application to Atkinson Cycle Performance Evaluation

Maheshwari¹

2013

IOSR-JMCE

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

Cited by 23 publications

References 21 publications

A point of view on Otto cycle approach specific for an undergraduate thermodynamics course in CMU

A point of view on Otto cycle approach specific for an undergraduate thermodynamics course in CMU

Power Optimization of a Miller Thermal Cycle with respect to Residual Gases and Equivalence Ratio

Entransy Loss and its Application to Atkinson Cycle Performance Evaluation

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