ENG  Vol.2 No.9 , September 2010
A Non-Dimensional Consideration in Combustor Axial Stress Computations
Abstract: Thermal stresses in the combustor of gas-turbines are computed using non-dimensional parameters. Buckingham pi theorem was used to arrange the listed relevant parameters into non-dimensional groups. In testing the validity of the functional relation of the non-dimensional independent parameters, use is made of the prevailing temperatures of the combustor in operation. A computer program was used to enhance computations. The results showed an interesting way of influencing the axial stresses. To reduce stresses in gas-turbine combustors, a method of varying the independent parameter that is of radius ratio oriented and thickness dependent was adopted. This showed a reduction of the axial stresses to minimal levels using the parameters. Plots were made and a point of inflection that manifested itself in the presentation of the axial stress function was further investigated upon. It turned out to be a point of abnormal stress level and out-of-trend temperature profile. The use of non-dimensional consideration proved adequate in the computation of axial stresses. The results showed a 2 percent difference from existing values of stresses got from a transient thermal loading of a combustor.
Cite this paper: nullE. Ufot, B. Lebele-Alawa, I. Douglas and K. Bob-Manuel, "A Non-Dimensional Consideration in Combustor Axial Stress Computations," Engineering, Vol. 2 No. 9, 2010, pp. 733-739. doi: 10.4236/eng.2010.29095.

[1]   G. N. Tret’yachenko, S. Karpinos and L. E. Kiyashko, “Thermal Stress State of Hollow Cylinders during Unilateral Internal Heating,” UDC 539.319.624.074.4, 1976.

[2]   I. J. Kumar and D. Rajgopalan, “Thermal Stresses in a Hollow Cylinder Due to a Sinusoidal Surface Heating Source,” V. R. Thiruvenkatachar, F. N. I., Defence Science Laboratory, Delhi 6 I, 1969.

[3]   K. Abrinia, H. Naee, F. Sadeghi and F. Djavanroodi, “New Anal-ysis for the FGM Thick Cylinders under Combined Pressure and Temperature Loading,” ? 2008 Science Publications Tehran, Amirabad Shomali St., Tehran, Iran 852, 2008.

[4]   S. Kubo, K. Uchida, T. Ishizaka and S. Ioka, “Determination of the Optimum Temperature History of Inlet Water for Minimizing Thermal Stresses in a Pipe by Multiphysics Inverse Analysis,” Journal of Physics: Conference Series, Vol. 135, 2008, p. 012058.

[5]   Y. Ootao, T. Akai and Y. Tanigawa, “Three-Dimensional Transient Thermal Stress Analysis of a Non-Homogeneous Hollow Circular Cylinder Due to a Moving Heat Source in the Axial Direction,” Journal of Thermal Stresses, Vol. 18, No. 5, 1995, pp. 497-512.

[6]   S. Fronius and G. Trankner, “Taschenbuch Maschinenbau, Band 1/īī Grundlagen,” 3rd Edition, VEB Verlag Technik, Berlin, 1975.

[7]   E. Ufot, “Modeling Thermal Stresses in the Com-bustor of Gas Turbine,” Ph.D. Dissertation. Rivers State Uni-versity of Science and Technology, Port Harcourt, 2010.