Volume 9, Issue 1 (12-2009)                   Modares Mechanical Engineering 2009, 9(1): 107-119 | Back to browse issues page

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Farshi B, Faezi M H. Optimization of Inhomogeneous Rotating Discs by the Ingredient Method. Modares Mechanical Engineering. 2009; 9 (1) :107-119
URL: http://mme.modares.ac.ir/article-15-8790-en.html
1- Iran University of Science and Technology
Abstract:   (4557 Views)
Abstract There are numerous applications for gas turbine discs in the aerospace industries such as in turbojet engines. These discs normally work under high temperature while subjected to high angular velocities. Minimizing the weight of such items in aerospace applications results in benefits such as low dead weights and lower costs. Optimization of rotating discs is historically, an area of research due to their vast utilization in industry. The gas turbine disc is one of examples to name. Gas turbine discs work mostly at high temperature gradients and are subjected to high angular velocities. High speed results in large centrifugal forces in disc and simultaneous high temperatures reduces the disc material strength, thus the later increases stress in disc automatically. In order to obtain a reliable disc analysis and arrive at the corresponding correct stress distribution, solution should consider changes in material properties due to the temperature field throughout the disc. To this end, an inhomogeneous disc model with variable thickness is considered. Using the variable material properties method, stresses are obtained for the disc under rotation and a steady temperature field. In this paper this is done by modeling the rotating disc as a series of different rings with constant properties. The optimum disc profile is arrived at by sequentially proportioning the thickness of each ring to satisfy stress requirements. In this paper these are done using the simplex method. Simplex algorithm is applied in Ansys software and the results are presented.
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Received: 2007/02/10 | Accepted: 2008/01/11 | Published: 2009/10/13

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