The effect of friction on the performance of an air standard dual cycle

Wang, Wenhua; Chen, Lingen; Sun, Fengrui; Chen, Wu

doi:10.1016/s1164-0235(02)00067-5

Cited by 41 publications

(31 citation statements)

References 14 publications

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“…Orlov and Berry (1993) deduced the power and efficiency limits for internal-combustion engines. AnguloBrown et al (1994); Chen et al (2002) and Wang et al (2002) modelled Otto, Diesel and Dual cycles with friction losses during a finite time. Klein (1991) investigated the effects of heat transfer on the performance of Otto and Diesel cycles.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of Diesel engines fueled by biodiesel blends via thermodynamic simulation of an air-standard Diesel cycle

Jeshvaghani

Fallahipanah

Gahruei

et al. 2013

Int. J. Environ. Sci. Technol.

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Because of environmental problems, it becomes necessary to develop alternative fuels that give engine performance at par with diesel. Among the alternative fuels, biodiesel and its blends hold good promises as an eco-friendly and the most promising alternative fuel for Diesel engine. The properties of biodiesel and its blends are found similar to that of diesel. Many researchers have experimentally evaluated the performance characteristics of conventional Diesel engines fueled by biodiesel and its blends. However, experiments require enormous effort, money and time. Hence, via finite-time thermodynamics simulation, an air-standard Diesel cycle model with heat transfer loss and variable specific heats of working fluid is analyzed to predict the performance of Diesel engine. The effect of compression ratio, cut-off ratio and fuel type on output work and thermal efficiency is investigated through the model. The fuels considered for the analysis are conventional diesel, rapeseed oil biodiesel and its blend (20 % biodiesel and 80 % diesel by volume). Numerical simulations showed that the output work and thermal efficiency of the engine decrease with increase of cut-off ratio for all fuels. Also, the model predicts similar performance with diesel and biodiesel blend which means that the biodiesel blend (20 % biodiesel and 80 % diesel by volume) could be a good alternative and eco-friendly fuel for conventional Diesel engines without any need to modify the engine.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of Diesel engines fueled by biodiesel blends via thermodynamic simulation of an air-standard Diesel cycle

Jeshvaghani

Fallahipanah

Gahruei

et al. 2013

Int. J. Environ. Sci. Technol.

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“…Taking into account the friction loss of the piston, Angulo-Brown et al [8], Chen et al [9] and Wang et al [10] modeled Otto, Diesel and dual cycles with friction-like loss, respectively. Furthermore, Chen et al [11,12] and Ge et al [13] derived the characteristics of power and efficiency for Otto, Dual and Miller cycles with considerations of heat transfer and friction-like term losses.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Chen et al [11,12] and Ge et al [13] derived the characteristics of power and efficiency for Otto, Dual and Miller cycles with considerations of heat transfer and friction-like term losses. The above studies [3][4][5][6][7][8][9][10][11][12][13] were done without considering the variable specific heats of working fluid. However, in the real engine cycle, the specific heat of working fluid is not a constant and should be considered in practical cycle analysis [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…In those studies [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], the heat addition process for an air standard cycle has been widely described as subtraction from the fuel's chemical energy of an arbitrary heat loss parameter times the average temperature of the heat adding period. That is, the heat transfer to the cylinder walls is assumed to be a linear function of the difference between the average gas and cylinder wall temperatures during the energy release process.…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of a Diesel Cycle under the Restriction of Maximum Cycle Temperature with Considerations of Heat Loss, Friction, and Variable Specific Heats

Hou

Lin

2011

Acta Phys. Pol. A

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The objective of this study is to examine the influences of heat loss characterized by a percentage of fuel's energy, friction and variable specific heats of working fluid on the performance of an air standard Diesel cycle with the restriction of maximum cycle temperature. A more realistic and precise relationship between the fuel's chemical energy and the heat leakage that is constituted on a pair of inequalities is derived through the resulting temperature. The variations in power output and thermal efficiency with compression ratio, and the relations between the power output and the thermal efficiency of the cycle are presented. The results show that the power output as well as the efficiency where maximum power output occurs will increase with the increase of maximum cycle temperature. The temperature-dependent specific heats of working fluid have a significant influence on the performance. The power output and the working range of the cycle increase while the efficiency decreases with increasing specific heats of working fluid. The friction loss has a negative effect on the performance. Therefore, the power output and efficiency of the cycle decrease with increasing friction loss. It is noteworthy that the effects of heat loss characterized by a percentage of fuel's energy, friction and variable specific heats of working fluid on the performance of a Diesel-cycle engine are significant and should be considered in practice cycle analysis. The results obtained in the present study are of importance to provide a good guidance for the performance evaluation and improvement of practical Diesel engines.

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“…Wang et al [10] modeled dual cycle with friction like term loss during a finite time and studied the effect of friction like term loss on cycle performance. * e-mail: Rahim.Ebrahimi@gmail.com Sahin et al [11] studied the optimal power density characteristics for Atkinson, Miller and dual cycles without any such losses.…”

Section: Introductionmentioning

confidence: 99%

Effects of Equivalence Ratio and Mean Piston Speed on Performance of an Irreversible Dual Cycle

Ebrahimi

2011

Acta Phys. Pol. A

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In the present study, the performance of an air standard dual cycle is analyzed using finite-time thermodynamics. The relations between the power output and the compression ratio, between the power output and the thermal efficiency are derived by detailed numerical examples. The results show that the maximum power output and the power output at the maximum efficiency point increase and then decrease as the equivalence ratio and/or the mean piston speed increases. The results also show that the optimal compression ratio corresponding to maximum power output point and the working range of the cycle remain constant as the mean engine speed is increased, but they increase and then decrease as the equivalence ratio is increased. It is noteworthy that the results obtained in the present study are of significance for providing guidance with respect to the performance evaluation of practical internal combustion engines.

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The effect of friction on the performance of an air standard dual cycle

Cited by 41 publications

References 14 publications

Performance analysis of Diesel engines fueled by biodiesel blends via thermodynamic simulation of an air-standard Diesel cycle

Performance analysis of Diesel engines fueled by biodiesel blends via thermodynamic simulation of an air-standard Diesel cycle

Performance Analysis of a Diesel Cycle under the Restriction of Maximum Cycle Temperature with Considerations of Heat Loss, Friction, and Variable Specific Heats

Effects of Equivalence Ratio and Mean Piston Speed on Performance of an Irreversible Dual Cycle

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