Thermo-mechanical analysis of an SI engine piston using different boundary condition treatments

Abstract

Heat transfer of an SI engine’s piston is calculated by employing three different methods based on resistor-capacitor model with the help of MATLAB code, and then the piston is thermo-mechanically analyzed using commercial ANSYS code. The results of three methods are compared to study their effects on the piston thermal behavior. It is shown that resistor-capacitor model with less number of equations and consequently less solution time, is an appropriate method for solving problems of engine piston heat transfer. In the second part, the thermal stresses due to non-uniform temperature distribution, and mechanical stresses due to mechanical loads are calculated. Finally, the temperature distributions as a thermal load along with mechanical loads are applied to the piston to determine the total stress distribution and critical fracture zones. It is found that the amount of thermal stresses is considerable.

Keywords

piston / temperature / boundary condition / stress / thermo-mechanical analysis

References

[1] SilvaF S. Fatigue on engine pistons—A compendium of case studies [J]. Journal of Engineering Failure Analysis, 2006, 13: 480-492

[2] EsfahanianV, JavaheriA, GhaffarpourM. Thermal analysis of an SI engine piston using different combustion boundary condition treatments [J]. Applied Thermal Engineering, 2006, 26: 277-287

[3] MohammadiA, YaghoubiM, RashidiM. Analysis of local convective heat transfer in a spark ignition engine [J]. Journal of Engineering Failure Analysis, 2006, 13: 480-492

[4] HEYWOOD J B. Internal combustion engine fundamentals [M]. New York: McGrow-Hill, 1988.

[5] BohacS V, BakerD M, AssanisD N. A global model for steady state and transient S.I. engine heat transfer studies [J]. SAE Paper, 1996960073

[6] KreithFPrinciple of heat transfer [M], 1959International Text Book CoScranton, Pennsylvania

[7] HarigayaY, TodaF, SuzukiM. Local heat transfer on a combustion chamber wall of a spark-ignition engine [J]. SAE Paper, 1993931130

[8] ValdesM, CasanovaJ, RoviraA. Design of carbon pistons using transient heat transfer and stress analyses [J]. SAE Paper, 200101-3217

[9] YangW-l, ChenG-h, WangC-f, YeX-m, ChenY. Simulation of transient heat transfer for coupling 3-D moving component system within internal combustion chamber [J]. SAE Paper, 200301-0617

[10] MerkerG P, SchwarzC H, TeichmannRCombustion engine development: Mixture formation, combustion, emissions and simulation [M], 2012

[11] BensonR S, AnnandW J D, BaruahP C. A simulation model including intake and exhaust systems for a single cylinder four-stroke cycle spark ignition engine [J]. International Journal of Mechanical Sciences, 1975, 17: 97-124

[12] CataniaA E, MisulD, MitticaA, SpessaE. A refined two-zone heat release model for combustion analysis in SI engines [J]. JSME International Journal Series B: Fluids and Thermal Engineering, 2003, 46: 75-85

[13] ErduranliP, KocaA, SekmenY. Performance calculation of a spark ignition engine according to the ideal air-fuel cycle analysis [J]. G.U. Journal of Science, 2005, 18(1): 103-114

[14] StoneRIntroduction to internal combustion engines [M], 1999LondonSAE International and McMillan Press

[15] MaherA R, Al-BaghdadiS. A simulation model for a single cylinder four-stroke spark ignition engine fueled with alternative fuels [J]. Turkish Journal of Engineering and Environmental Science, 2006, 30: 331-350

[16] FergusonC R, KirkparrickA TInternal combustion engine, applied thermosciences [M], 1986New YorkJohn Wiley & Sons, Inc

[17] TorregrosaA, OlmedaP, DegraeuweB, ReyesM. A concise wall temperature model for DI Diesel engines [J]. Journal of Applied Thermal Engineering, 2006, 26: 1320-1327

[18] BuyukkayaE. Thermal analysis of functionally graded coating AlSi alloy and steel pistons [J]. Journal of Surface & Coatings Technology, 2008, 202: 3856-3865

[19] LiC-H. Piston thermal deformation and friction consideration [J]. Technical SAE Paper, 1982

[20] BoleyB A, WeinerJTheory of thermal stresses [M], 1960New YorkWiley