Heat Transfer and Thermal Load Analysis of Exhaust Manifold

Abstract:

With the appearance of high temperature resistance alloy steel and the requirement of light weight for vehicles, more and more exhaust manifolds are made from newly developed alloy steel. The changing of material directly affects the design and manufacturing process. To estimate the thermal load of the tight-coupled exhaust manifold, the joint analysis methods of CFD and FEM are put forward to predict the temperature distribution, thermal stress and deformation. Using Computational Fluid Dynamics (CFD) method, gas temperature and convective heat transfer coefficient, adjoining the inside and outside surfaces of the exhaust manifold, are estimated firstly in this paper. Then these results are mapped to the finite element mesh of exhaust manifold, which are created for the heat transfer analysis. At last, thermal stress and thermal deformation analysis are presented by taking nonlinear material properties into account, which provide some reference to evaluate the cooling capacity and structure design of exhaust manifold.

• Periodical: Applied Mechanics and Materials (Volumes 226-228)
• Pages: 2240-2244
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.226-228.2240
• Online since: November 2012
• Authors: Shi Long Xu, Yan Shi, Shou Cheng Li
• Keywords: Computational Fluid Dynamics (CFD), Exhaust Manifold, Finite Element Method (FEM), Heat Transfer Coefficient (HTC), Thermal Deformation, Thermal Stress

References

[1] L.X. Guo, Y. Han, H. Hui, H.T. Yang, X.L. Xia and K. Wang: Modern Vehicle Power, Vol. 2 (2009), p.10. (In Chinese)

[2] L.X. Wang, W. Liu and X.W. Pan: Design Research, Vol. 12 (2007), p.15. (In Chinese)

[3] J. Zhou and W. Chang: AVL User Conference (China, 2010). (In Chinese)

[4] W. Li, K.J. Liu, Y.H. Zhang and D.Z. Zhou: Automobile Technology & Material, Vol. 06 (2006) No.02, p.25. (In Chinese)

[5] Q.Y. Fu: Journal of Hefei University of Technology, Vol. 32 (2009) No.zl, p.175. (In Chinese)

[6] B.L. Deng, B.L. Wang, J.C. Li, R.H. Feng and S.L. Xu: The Fifth CAE Engineering Analysis Technology Conference of China (China, July28-29, 2009). p.579. (In Chinese)

[7] X. Yang and T. Guo: Equipment Manufacturing Technology, (2009) No.10, p.42. (In Chinese)

[8] FIRE Version 8.31 Manual

[9] B.Y. Xu and X.S. Liu: Application of Elastic Plastic mechanics, (Tsinghua University Press, China 1995). (In Chinese)