Effect of Ethanol-Air Equivalence Ratio on Performance of an Endoreversible Otto Engine

Abstract:

Today, the world community is looking for fuel efficient and environmentally viable alternatives for many of the traditional energy conversion approaches. This development has further worked to increase the technical focus on conventional cycles for making them more optimum in terms of performance. Hence, the objective of this paper is to study the effect of ethanol-air equivalence ratio on the power output and the indicated thermal efficiency of an air standard Otto cycle. Optimization of the cycle has been performed for power output as well as for thermal efficiency with respect to compression ratio. The results show that the maximum power output, the optimal compression ratio corresponding to maximum power output point, the optimal compression ratio corresponding to maximum thermal efficiency point and the working range of the cycle first increase and then decrease as the equivalence ratio increases. The result obtained herein provides a guide to the performance evaluation and improvement for practical Otto engines.

• Periodical: Applied Mechanics and Materials (Volumes 110-116)
• Pages: 273-277
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.110-116.273
• Online since: October 2011
• Authors: Rahim Ebrahim, Mahmoud Reza Tadayon, Farshad Tahmasebi Gandomkari, Kamyar Mahbobian
• Keywords: Component, Endoreversible, Optimization, Otto Cycle

References

[1] C. Wu and D. A. Blank, Energy Convers. Mgmt 34, 1255 (1993).

[2] D. A. Blank and C. Wu, Energy Convers. Mgmt 34, 493 (1993).

[3] Ebrahimi R. Thermodynamic simulation of performance of an endoreversible Dual cycle with variable specific heat ratio of working fluid. Journal of American Science 200b9; 5(5): 175-180.

[4] Ebrahimi R. Engine speed effects on the characteristic performance of Otto engines. Journal of American Science 2009c; 5(8): 25-30.

[5] Ge Y, Chen L, Sun F, Wu C. Thermodynamic simulation of performance of an Otto cycle with heat transfer and variable specific-heats of the working fluid. International Journal of Thermal Sciences 2005; 44(5): 506–511.

DOI: 10.1016/j.ijthermalsci.2004.10.001

[6] V.N. Orlov, R.S. Berry, Power and efficiency limits for internal combustion engines via methods of finite-time thermodynamics, J. Appl. Phys. 74 (10) (1993) 4317–4322.

DOI: 10.1063/1.354396

[7] S.A. Klein, An explanation for observed compression ratios in internal combustion engines, Trans. ASME J. Engrg. Gas Turbine Pow. 113 (4) (1991) 511–513.

DOI: 10.1115/1.2906270

[8] L. Chen, F. Zen, F. Sun, C. Wu, Heat transfer effects on the net work output and power as function of efficiency for air standard Diesel cycle, Energy Internat. J. 21 (12) (1996) 1201–1205.

DOI: 10.1016/0360-5442(96)00057-6

[9] Abd Alla GH. Computer simulation of a four stroke spark ignition engine. Energy Conversion & Management, 2002; 43: 1043-1061.

DOI: 10.1016/s0196-8904(01)00092-9

[10] Heywood JB. Internal combustion engine fundamentals. New York: McGraw-Hill; (1997).

[11] Ge Y, Chen L, Sun F, Wu C. Thermodynamic simulation of performance of an Otto cycle with heats transfer and variable specific heats of working fluid. Int. J. Thermal. Science, 2005, 44(5): 506-511.

DOI: 10.1016/j.ijthermalsci.2004.10.001

[12] Ge Y, Chen L, Sun F, Wu C. Effects of variable specific heats on the performance of an irreversible Otto cycle. Int. J. Exergy, 2005, 2(3): 274-283.

DOI: 10.1504/ijex.2005.007255

[13] Ge Y, Chen L, Sun F, Wu C. Effects of heat transfer and variable specific heats of working fluid on performance of a Miller cycle. Int. J. Ambient Energy, 2005, 26(4): 203-214.

DOI: 10.1080/01430750.2005.9674991

[14] Ge Y, Chen L, Sun F, Wu C. Performance of an Atkinson cycle with heat transfer, friction and variable specific heats of working fluid. Appl. Energy, 2006, 83(11): 1210-1221.

DOI: 10.1016/j.apenergy.2005.12.003

[15] Mercier M. Contribution to the study of the behavior of a spark ignition engine fueled with Groningen natural gas. Phd. Thesis, Université de Valenciennes et du Hainaut Cambrésis France, (2006).