Optimum Cylinder Cooling for Advanced Diesel Engines

Author:

Trenc F.1,Rodman S.1,Skerget L.2,Delic M.2

Affiliation:

1. Department of Mechanical Engineering, University of Ljubljana, Asuerceva 6, Ljubljana, Slovenia, SLO-1000

2. Department of Mechanical Engineering, University of Maribor, Maribor, Slovenia

Abstract

Continuous demand for higher specific engine output simultaneously introduces problems of higher mechanical and thermal stresses of the engine components. Uneven temperature distribution in the cylinder wall of a diesel engine, especially when air-cooled, is well known. Peak local temperatures, large circumferential and longitudinal temperature gradients provoke deformations that, in turn, affect the reliability of the engine. As the result of intensive numerical and experimental investigations, a horizontal, curved channel fed with engine lubrication oil was introduced in the upper part of the air-cooled cylinder. Optimization of the channel design, its position, and determination of suitable asymmetrical split oil flow have led to more favorable cylinder temperature distribution, similar to that obtained by advanced water-cooled engines. Analyses of the local laminar oil-flow phenomena and local heat transfer distribution in curved channels are discussed in the paper and can be successfully applied to advanced liquid-cooled engines.

Publisher

ASME International

Subject

Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering

Reference13 articles.

1. Delic M. , SkergetL., ZagarL., and TrencF., 1995, “Thermo-Hydraulic Conditions of Laminar Fluid Flow in Narrow Channels,” Journal of Mechanical Engineering, Vol. 41, No. 7–8, Ljubljana, Slovenia, pp. 219–228.

2. Delic, M., Skerget, P., and Trenc, F., 1996, “Flow Phenomena of Laminar Split-Oil Flow in a Curved Horizontal Channel,” 4th Int. Conference, Heat Transfer ’96, Computational Mechanics Publications, Southampton, UK, pp. 115–124.

3. Dobovisek, Z., and Humski, F., 1989, “Survey of the Literature on the Cooling Problems Concerning Air-Cooled Cylinders of Diesel Engines,” Seminar Work, Dep. of Mech. Engineering, Technical Faculty of Maribor, Slovenia, pp. 21–22.

4. Ma, C. F., Sun, H., Auracher, H., and Gomi, T., 1990, “Local Convective Heat Transfer from Vertical Heated Surfaces to Impinging Circular Jets of Large Prandtl Number Liquids,” Proceedings of the 4th Int. Conference on Heat Transfer, No. 4-MC-16, Hemisphere Publishing Corporation, NY, pp. 441–446.

5. Rodman, S., Delic, M., Oberdank, K., Trenc, F., and Skerget, P., 1996, “Comparison of Experimental and Numerical Results and Analyses of the Oil-Flow in a Curved Channel,” Proceedings of the Conference Kuhljevi dnevi, Sl. drusˇtvo za mehaniko, Gozd Martuljek, Slovenija, pp. 169–176.

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