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Valve Body Thermal Stress Control While Warming Up

[+] Author Affiliations
Jin He

Shanghai Electric Group, Shanghai, China

Paper No. GT2017-64126, pp. V07AT30A004; 5 pages
doi:10.1115/GT2017-64126
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 7A: Structures and Dynamics
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5092-3
  • Copyright © 2017 by ASME

abstract

Quasi-stationary theory is applied to a simplified one-dimensional solid to work out warm-up thermal stress [1]. This paper verifies the quasi-stationary state exits in the three-dimensional valve body warm-up process, and the relationship of the thermal stress and the temperature difference is similar.

Dynamic analysis of warming-up at constant temperature increasing speed shows that: the ratio of the thermal stresses and the temperature difference gets the max value at the quasi-stationary state. The ratio is not influenced by the surface heat transfer coefficient, the material thermal diffusion coefficient and the temperature raise speed. It is a safety way to estimate the thermal stresses by temperature difference multiplied by this max ratio value. For quasi-stationary, once the temperature measure points be located, the ratio between stresses of any selected point and temperature difference is fixed. Where to set the measure points is unlimited, and the mean metal temperature, which is not easy to get, may not be applied anymore.

Copyright © 2017 by ASME

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