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Determination of heat transfer coefficient in a T-shaped cavity by means of solving the inverse heat conduction problem.
- Source :
-
International Journal of Numerical Methods for Heat & Fluid Flow . 2020, Vol. 30 Issue 4, p1725-1742. 18p. - Publication Year :
- 2020
-
Abstract
- Purpose: T-shaped cavities occur by design in many technical applications. An example of such a stator cavity is the side space between the guide vane carriers and the outer casing of a steam turbine. Thermal conditions inside it have a significant impact on the deformation of the turbine casing. In order to improve its prediction, the purpose of this paper is to provide a methodology to gain better knowledge of the local heat transfer at the cavity boundaries based on experimental results. Design/methodology/approach: To determine the heat transfer coefficient distribution inside a model cavity with the help of a scaled generic test rig, an inverse heat conduction problem is posed and a method for solving such type of problems in the form of linear combinations of Trefftz functions is presented. Findings: The results of the calculations are compared with another inverse method using first-order gradient optimization technique as well as with estimated values obtained with an analytic two-dimensional thermal network model, and they show an excellent agreement. The calculation procedure is proved to be numerically stable for different degrees of complexity of the sought boundary conditions. Originality/value: This paper provides a universal and robust methodology for the fast direct determination of an arbitrary distribution of heat transfer coefficients based on material temperature measurements spread over the confining wall. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09615539
- Volume :
- 30
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- International Journal of Numerical Methods for Heat & Fluid Flow
- Publication Type :
- Periodical
- Accession number :
- 142742075
- Full Text :
- https://doi.org/10.1108/HFF-09-2018-0484