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Ecological optimization of an irreversible Diesel cycle

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Abstract

Applying finite-time thermodynamics and air standard assumption, the irreversible Diesel cycle model is established with friction loss, heat transfer loss and internal irreversibility loss considered. Calculating the entropy generation rate by loss items, the cycle ecological function performance is optimized. The performance characteristics of ecological function and entropy generation rate are derived, and the impacts of three losses on ecological function performance are examined by the numerical method. The work in this paper can provide some guidelines for designers and manufacturers to assess the practical Diesel cycle performance.

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Abbreviations

A :

Heat rate released by fuel (kW)

B :

Constant related to heat transfer (\({\text{kJ}}\;{\text{kg}}^{ - 1} \;{\text{K}}^{ - 1}\))

C :

Specific heat (kJ·kg−1·K−1)

E :

Ecological function (kW)

L :

Stroke length (m)

m :

Mass flow rate (kg/s)

n :

Cycles running during one second

P :

Power output (kW)

Q :

Heat rate of added or rejected by the working fluid (kW)

T :

Temperature (K)

V :

Volume (m3)

\(\gamma\) :

Compression ratio

\(\eta\) :

Efficiency

\(\eta_{{\text{c}}}\) :

Compression efficiency

\(\eta_{{\text{e}}}\) :

Expansion efficiency

\(\sigma\) :

Entropy generation rate

\(E\) :

The max ecological function point

in:

Heat added

leak:

Heat leakage

di:

Diesel cycle

out:

Heat rejected

p:

The max power output point

pq:

Exhaust stroke

q:

The effect of heat transfer

\(\mu\) :

The effect of friction loss

\(\eta\) :

The max thermal efficiency point

0:

Environment

AS:

Air standard

DC:

Diesel cycle

ECF:

Ecological function

EGR:

Entropy generation rate

FL:

Friction loss

FTT:

Finite-time thermodynamics

HTL:

Heat transfer loss

IIL:

Internal irreversibility loss

LF:

Linear function

NLF:

Nonlinear function

SH:

Specific heat

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Acknowledgements

This paper was supported by the National Natural Science Foundation of China (Project No. 51779262). The authors wish to thank the reviewers and the editor for their careful, unbiased and constructive suggestions, which led to this revised manuscript.

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Authors and Affiliations

  1. Institute of Thermal Science and Power Engineering, Wuhan Institute of Technology, Wuhan, 430205, People’s Republic of China

    Yanlin Ge, Lingen Chen & Huijun Feng

  2. School of Mechanical and Electrical Engineering, Wuhan Institute of Technology, Wuhan, 430205, People’s Republic of China

    Yanlin Ge, Lingen Chen & Huijun Feng

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  1. Yanlin Ge
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Correspondence to Lingen Chen.

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Ge, Y., Chen, L. & Feng, H. Ecological optimization of an irreversible Diesel cycle. Eur. Phys. J. Plus 136, 198 (2021). https://doi.org/10.1140/epjp/s13360-021-01162-z

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