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International Journal of Rotating Machinery
Volume 2016 (2016), Article ID 5834172, 8 pages
http://dx.doi.org/10.1155/2016/5834172
Research Article

Effect of the Modification of the Start-Up Sequence on the Thermal Stresses for a Microgas Turbine

1Universidad Autónoma del Estado de Morelos (UAEM), Universidad 1001, Colonia Chamilpa, 62209 Cuernavaca, MOR, Mexico
2ETU i+D, Cuauhtémoc 3, Colonia Industrial San Pedrito Peñuelas, 76148 Querétaro, QRO, Mexico
3Centro Nacional de Desarrollo Tecnológico, Interior Internado Palmira s/n, Colonia Palmira, 62490 Cuernavaca, MOR, Mexico

Received 31 December 2015; Accepted 17 April 2016

Academic Editor: Jiun-Jih Miau

Copyright © 2016 Oscar Tenango-Pirin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Microgas turbines (MGT) are an alternative for small-scale energy production; however, their small size becomes a drawback since it enhances the heat transfer among their components. Moreover, heat transfer drives to temperature gradients which become higher during transient cycles like start-up. The influence of different start-up curves on temperature and thermal stresses of a microgas turbine was investigated. Stationary and rotational blades of the turbine were numerically simulated using CFD and FEM commercial codes. Conjugated heat transfer cases were solved for obtaining heat transfer from fluid toward the blades. Changes of temperature gradients within the blades during the start-ups were calculated under transient state with boundary conditions according to each curve to assess accurate thermal stresses calculations. Results showed that the modification of the start-up curves had an impact on the thermal stresses levels and on the time when highest stresses appeared on each component. Furthermore, zones highly stressed were located near the constraints of blades where thermal strains are restricted. It was also found that the curve that had a warming period at the beginning of the start-up allowed reducing the peaks of stresses making it more feasible and safer for the turbine start-up operation.