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Entropy generation in a diesel engine turbocharging system

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  • Nakonieczny, K.

Abstract

The paper describes a model of entropy production in a diesel engine turbocharging system, discussing the processes occurring in the compressor, turbine, piping system, charge-air cooler and valves with the exclusion of combustion. The charging efficiency of the system is studied in two distinct engine operating states, conforming to maximum torque and nominal power conditions. Unlike in the standard approach, where the irreversibilities are derived from the balance equation for exergy and thus are addressed inexactly, the criterion function based on the notion of entropy generation, introduced in this paper, improves second law analysis of turbocharged engines by accounting for a direct description of the system internal irreversibilities. This function is used for the examination of an impact of the system design parameters on its efficiency. Computations based on the unsteady one-dimensional flow model show that, under the variations of the inlet pipe length, the timings of inlet valve opening and exhaust valve closure, and the valve overlap period, a favourable correlation can be found between the decrease of entropy production and the increase in amount of air charged into the engine cylinders. The other variables under study, including the turbine equivalent area, temperature decrease in intercooler and wastegate effective area ratio, show an opposite correlation, and thus, can be viewed as constraints in the system optimisation.

Suggested Citation

  • Nakonieczny, K., 2002. "Entropy generation in a diesel engine turbocharging system," Energy, Elsevier, vol. 27(11), pages 1027-1056.
    • Handle: RePEc:eee:energy:v:27:y:2002:i:11:p:1027-1056
    DOI: 10.1016/S0360-5442(02)00082-8
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    References listed on IDEAS

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    1. Rakopoulos, C.D. & Giakoumis, E.G., 1997. "Simulation and exergy analysis of transient diesel-engine operation," Energy, Elsevier, vol. 22(9), pages 875-885.
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    1. Sciacovelli, A. & Verda, V. & Sciubba, E., 2015. "Entropy generation analysis as a design tool—A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 43(C), pages 1167-1181.
    2. Rakopoulos, C.D. & Giakoumis, E.G., 2006. "Comparative first- and second-law parametric study of transient diesel engine operation," Energy, Elsevier, vol. 31(12), pages 1927-1942.
    3. Kaluri, Ram Satish & Basak, Tanmay, 2011. "Entropy generation due to natural convection in discretely heated porous square cavities," Energy, Elsevier, vol. 36(8), pages 5065-5080.
    4. Wołosz, Krzysztof J., 2018. "Exergy destruction in the pneumatic pulsator system during one working cycle," Energy, Elsevier, vol. 146(C), pages 124-130.
    5. Halis, Serdar & Doğan, Battal, 2023. "Effects of intake air temperature on energy, exergy and sustainability analyses in an RCCI engine fueled with iso-propanol and n-heptane," Energy, Elsevier, vol. 284(C).
    6. Gonca, Guven & Sahin, Bahri & Ust, Yasin, 2013. "Performance maps for an air-standard irreversible Dual–Miller cycle (DMC) with late inlet valve closing (LIVC) version," Energy, Elsevier, vol. 54(C), pages 285-290.
    7. Arjmandi, H.R. & Amani, E., 2015. "A numerical investigation of the entropy generation in and thermodynamic optimization of a combustion chamber," Energy, Elsevier, vol. 81(C), pages 706-718.

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