NDLI: Experimental Investigation Into Thermal Behavior of Steam Turbine Components: Part 2—Natural Cooling of Steam Turbines and the Impact on LCF Life

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Marinescu, Gabriel Ehrsam, Andreas
Copyright Year	2012
Abstract	Steam turbine cool-down has a significant impact on the cyclic fatigue life. A lower initial metal temperature after standstill results in a higher temperature difference to be overcome during the next start-up. Generally, lower initial metal temperatures result in higher start-up stress. In order to optimize steam turbines for cyclic operation, it is essential to fully understand natural cooling, which is especially challenging for rotors. A two-dimensional numerical procedure is described for the assessment of the thermal regime during natural cooling including the rotors, casings, valves and main pipes. The concept of the cooling calculation is to replace the steam gross buoyancy during the gland steam ingestion phase by an equivalent fluid conductivity, that gives the same thermal effect on the metal parts. The fluid equivalent conductivity is calculated based on measurements. The approach is calibrated with experimental data. Finally, the highly sensitive nature of the cyclic lifetime to the predicted cooling evolution is demonstrated. This paper is complementary with the paper [1].
Sponsorship	International Gas Turbine Institute
Starting Page	1111
Ending Page	1120
Page Count	10
File Format	PDF
ISBN	9780791844700
DOI	10.1115/GT2012-68759
Volume Number	Volume 4: Heat Transfer, Parts A and B
Conference Proceedings	ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2012-06-11
Publisher Place	Copenhagen, Denmark
Access Restriction	Subscribed
Subject Keyword	Fatigue life Temperature Cooling Electrical conductivity Metals Rotors Buoyancy Valves Steam turbines Stress Fluids Temperature effects Steam Thermal conductivity Pipes
Content Type	Text
Resource Type	Article

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