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Experimental evaluation of local instantaneous heat transfer characteristics in the combustion chamber of air-cooled direct injection diesel engine

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  • Rakopoulos, C.D.
  • Mavropoulos, G.C.

Abstract

An experimental analysis is conducted investigating the differences between the variations of overall and local instantaneous heat transfer coefficients, during the engine cycle, in the combustion chamber walls of a direct injection (DI), air-cooled diesel engine located at the authors’ laboratory. For this purpose, a novel experimental installation is developed, which separates the engine transient temperature signals into two parts, namely the long- and the short-term response ones, processed in two independent data acquisition systems. Moreover, a new pre-amplification unit for fast response thermocouples, appropriate heat flux sensors and an object-oriented control code for fast data acquisition have been designed and applied. Experimentally obtained cylinder pressure diagrams are used as a basis for the calculation of the overall heat transfer coefficients, whereas one-dimensional heat conduction theory with Fourier analysis techniques, combined with an iterative procedure between calculated and measured temperature data, are implemented in order to calculate the instantaneous local heat transfer coefficients in the engine cylinder. Analysis of the experimental results reveals interesting aspects of transient engine heat transfer. Significant differences are disclosed between the overall and local heat transfer coefficient variations, with the importance of the latter one on engine design being emphasized. The local heat transfer coefficient on the cylinder head is quantified based on the experimental data. The effect of engine speed and load as well as of the air swirling motion on the heat transfer variations are presented. From the analysis results it is concluded that the instantaneous heat transfer variation is non-uniform, unlike its values calculated from standard correlations that assume spatial uniformity, noting that such information, especially for air-cooled diesel engines, seems to be very scarce in the open literature.

Suggested Citation

  • Rakopoulos, C.D. & Mavropoulos, G.C., 2008. "Experimental evaluation of local instantaneous heat transfer characteristics in the combustion chamber of air-cooled direct injection diesel engine," Energy, Elsevier, vol. 33(7), pages 1084-1099.
    • Handle: RePEc:eee:energy:v:33:y:2008:i:7:p:1084-1099
    DOI: 10.1016/j.energy.2008.02.003
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    References listed on IDEAS

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    1. Rakopoulos, C.D. & Scott, M.A. & Kyritsis, D.C. & Giakoumis, E.G., 2008. "Availability analysis of hydrogen/natural gas blends combustion in internal combustion engines," Energy, Elsevier, vol. 33(2), pages 248-255.
    2. Rakopoulos, C.D. & Antonopoulos, K.A. & Rakopoulos, D.C., 2007. "Experimental heat release analysis and emissions of a HSDI diesel engine fueled with ethanol–diesel fuel blends," Energy, Elsevier, vol. 32(10), pages 1791-1808.
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    Cited by:

    1. Rakopoulos, C.D. & Kosmadakis, G.M. & Pariotis, E.G., 2010. "Critical evaluation of current heat transfer models used in CFD in-cylinder engine simulations and establishment of a comprehensive wall-function formulation," Applied Energy, Elsevier, vol. 87(5), pages 1612-1630, May.
    2. Li, Yaopeng & Jia, Ming & Chang, Yachao & Kokjohn, Sage L. & Reitz, Rolf D., 2016. "Thermodynamic energy and exergy analysis of three different engine combustion regimes," Applied Energy, Elsevier, vol. 180(C), pages 849-858.
    3. Broatch, Alberto & Olmeda, Pablo & García, Antonio & Salvador-Iborra, Josep & Warey, Alok, 2017. "Impact of swirl on in-cylinder heat transfer in a light-duty diesel engine," Energy, Elsevier, vol. 119(C), pages 1010-1023.
    4. Desantes, J.M. & Torregrosa, A.J. & Broatch, A. & Olmeda, P., 2011. "Experiments on the influence of intake conditions on local instantaneous heat flux in reciprocating internal combustion engines," Energy, Elsevier, vol. 36(1), pages 60-69.
    5. Mavropoulos, G.C., 2011. "Experimental study of the interactions between long and short-term unsteady heat transfer responses on the in-cylinder and exhaust manifold diesel engine surfaces," Applied Energy, Elsevier, vol. 88(3), pages 867-881, March.

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