NDLI: Development and Validation of an Object-Oriented Code Implementing an Enhanced Radiative Joined MBL-Zonal Method Technique

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ratto, Luca Ottino, Gabriele Maritano, Massimiliano
Copyright Year	2012
Abstract	Gas turbines are the most widely employed high power prime movers for energy production and propulsion; their success is based on high power density, high reliability and low pollutant emissions. Due to the increasing performance request of modern gas turbines, combustion chambers and, more in general, turbine components are subjected to increasingly high thermal loads, due to both convection and radiation between solid walls and internal fluid. Computational Fluid Dynamics (CFD) tools are typically employed to reproduce these phenomena: commercial codes provide tools for both the heat transfer methods, but the radiation analysis sometimes could represent a great increase in the computational load; for this reason, it is a widespread industrial practice to avoid direct simulation of radiative phenomena during simulations, confining it during the post-processing activity. A typical industrial approach relies on the so-called Zonal Method, which guarantees a good compromise between accuracy of results and computational load. In a previous work, an innovative method for radiative thermal load evaluation has been presented by the authors, which is based on a joined Zonal Method-Mean Beam Length (MBL) approach: it enables a great reduction in time consumption by means of an appropriate Artificial Neural Network, but its usage is limited to hexahedral structured grids, which reduces its application to relatively simple geometries. In this paper, the method previously mentioned has been extended to unstructured tetrahedral grids. The procedure developed has been implemented in an object-oriented code by means of an open-source library: great advantages have been obtained both in the implementation, which results to be simpler, making any future modifications faster and intuitive, and in the application field, being extended to almost any kind of geometry. The code has been validated on literature test cases providing a good agreement between numerical and experimental results. Moreover, an industrial application has been described: it concerns the evaluation of the radiative heat transfer on the shells of an industrial gas turbine combustion chamber. Results are presented and discussed.
Sponsorship	International Gas Turbine Institute
Starting Page	1073
Ending Page	1082
Page Count	10
File Format	PDF
ISBN	9780791844700
DOI	10.1115/GT2012-69837
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	Industrial gases Power density Computational fluid dynamics Artificial neural networks Shells Convection Stress Emissions Geometry Fluids Pollution Gas turbines Radiation (physics) Simulation Energy generation Propulsion Combustion chambers Reliability Heat transfer Radiative heat transfer Turbine components Turbines
Content Type	Text
Resource Type	Article

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