Optimization of the power, efficiency and ecological function for an air-standard irreversible Dual-Miller cycle

doi:10.1007/s11708-018-0557-z

Front. Energy

2019, Vol. 13

Issue (3) : 579-589 https://doi.org/10.1007/s11708-018-0557-z

RESEARCH ARTICLE

Optimization of the power, efficiency and ecological function for an air-standard irreversible Dual-Miller cycle

Zhixiang WU, Lingen CHEN(

), Yanlin GE, Fengrui SUN

Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan 430033, China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan 430033, China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, China

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Abstract

This paper establishes an irreversible Dual-Miller cycle (DMC) model with the heat transfer (HT) loss, friction loss (FL) and other internal irreversible losses. To analyze the effects of the cut-off ratio (ρ) and Miller cycle ratio (r_M) on the power output (P), thermal efficiency (η) and ecological function (E), obtain the optimal ρ_opt and optimal r_Mopt, and compare the performance characteristics of DMC with its simplified cycles and with different optimization objective functions, the P, η and E of irreversible DMC are analyzed and optimized by applying the finite time thermodynamic (FTT) theory. Expressions of P, η and E are derived. The relationships among P, η, E and compression ratio (ε) are obtained by numerical examples. The effects of ρ and r_M on P, η, E, maximum power output (MP), maximum efficiency (MEF) and maximum ecological function (ME) are analyzed. Performance differences among the DMC, the Otto cycle (OC), the Dual cycle (DDC), and the Otto-Miller cycle (OMC) are compared for fixed design parameters. Performance characteristics of irreversible DMC with the choice of P, η and E as optimization objective functions are analyzed and compared. The results show that the irreversible DMC engine can reach a twice-maximum power, a twice-maximum efficiency, and a twice-maximum ecological function, respectively. Moreover, when choosing E as the optimization objective, there is a 5.2% of improvement in η while there is a drop of only 2.7% in P compared to choosing P as the optimization objective. However, there is a 5.6% of improvement in P while there is a drop of only 1.3% in η compared to choosing as the optimization objective.

Keywords finite-time thermodynamics Dual-Miller cycle power output thermal efficiency ecological function

Corresponding Author(s): Lingen CHEN

Just Accepted Date: 30 March 2018 Online First Date: 02 May 2018 Issue Date: 04 September 2019

Cite this article:

Zhixiang WU,Lingen CHEN,Yanlin GE, et al. Optimization of the power, efficiency and ecological function for an air-standard irreversible Dual-Miller cycle[J]. Front. Energy, 2019, 13(3): 579-589.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-018-0557-z
https://academic.hep.com.cn/fie/EN/Y2019/V13/I3/579

Fig.1 P-V and T-s diagrams for an irreversible DMC

Fig.2 P versus η characteristic of irreversible Otto, Dual, Miller and Dual-Miller cycles

Fig.3 E versus ε characteristic of irreversible Otto, Dual, Miller and Dual-Miller cycles

Fig.4 Effect of ρ on P versus η characteristic (r_M= 2)

Fig.5 Effect of ρ on E versus ε characteristic (r_M= 2)

Fig.6 Effect of r_M on P versus η characteristic (ρ = 2)

Fig.7 Effect of r_M on E versus ε characteristic (ρ = 2)

Fig.8 Effects of ρ and r_M on

MP

of irreversible DMC

Fig.9 Fig. 9 Effects of ρ and r_M on

MEF

of irreversible DMC

Fig.10 Effects of ρ and r_M on

ME

of irreversible DMC

Fig.11 Power output characteristics with different objective functions (ρ = 2)

Fig.12 Efficiency characteristics with different objective functions (ρ = 2)

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