Optimization of power and efficiency for an irreversible Diesel heat engine

doi:10.1007/s11708-010-0018-9

Front Energ Power Eng Chin

2010, Vol. 4

Issue (4) : 560-565 https://doi.org/10.1007/s11708-010-0018-9

RESEARCH ARTICLE

Optimization of power and efficiency for an irreversible Diesel heat engine

Shiyan ZHENG^1,2, Guoxing LIN³(

)

1. College of Physics and Information Engineering, Institute of Functional; 2. Material, Quanzhou Normal University, Quanzhou 362000, China; 3. Department of Physics, Xiamen University, Xiamen 361005, China

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Abstract

A cyclic model of an irreversible Diesel heat engine is presented, in which the heat loss between the working fluid and the ambient during combustion, the irreversibility inside the cyclic working fluid resulting from friction, eddies flow, and other irreversible effects are taken into account. By using the thermodynamic analysis and optimal control theory methods, the analytical expressions of power output and efficiency of the Diesel heat engine are derived. Variations of the main performance parameters with the pressure ratio of the cycle are analyzed and calculated. The optimum operating region of the heat engine is determined. Moreover, the optimum criterion of some important parameters, such as the power output, efficiency, pressure ratio, and temperatures of the working fluid at the related state points are illustrated and discussed. The conclusions obtained in the present paper may provide some theoretical guidance for the optimal parameter design of a class of internal-combustion engines.

Keywords Diesel heat engine irreversibility power output efficiency parameter optimization

Corresponding Author(s): LIN Guoxing,Email:gxlin@xmu.edu.cn

Issue Date: 05 December 2010

Cite this article:

Shiyan ZHENG,Guoxing LIN. Optimization of power and efficiency for an irreversible Diesel heat engine[J]. Front Energ Power Eng Chin, 2010, 4(4): 560-565.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-010-0018-9
https://academic.hep.com.cn/fie/EN/Y2010/V4/I4/560

Fig.1 The - diagram of an irreversible Diesel heat engine cycle

Fig.2 The dimensionless power output versus the pressure ratio curves. Plots are presented for , , , , and . Curves I, II, III and IV correspond to the cases of , 0.99, 0.98 and 0.97, respectively

Fig.3 The dimensionless power output versus the temperature of the working fluid curves. The related parameter values are the same as those used in Fig. 2

Fig.4 The dimensionless power output versus the temperature of the working fluid curves. The related parameter values are the same as those used in Fig. 2

Fig.5 The efficiency versus the pressure ratio curves. The related parameter values are the same as those used in Fig. 2

Fig.6 The efficiency versus the temperature of the working fluid curves. The related parameter values are the same as those used in Fig. 2

Fig.7 The efficiency versus the temperature of the working fluid curves. The related parameter values are the same as those used in Fig. 2

Fig.8 The dimensionless power output * versus the efficiency curves. The related parameter values are the same as those used in Fig. 2

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