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Gas Turbines: Internal Flow Systems Modeling
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TLDR
In this article, a physics-first and design-oriented text describes and explains the underlying flow and heat transfer theory of secondary air systems and provides the reader with robust solution techniques, state-of-the-art three dimensional computational fluid dynamics (CFD) methodologies, and examples of compressible flow network modeling.Abstract:
This long-awaited, physics-first and design-oriented text describes and explains the underlying flow and heat transfer theory of secondary air systems. An applications-oriented focus throughout the book provides the reader with robust solution techniques, state-of-the-art three-dimensional computational fluid dynamics (CFD) methodologies, and examples of compressible flow network modeling. It clearly explains elusive concepts of windage, non-isentropic generalized vortex, Ekman boundary layer, rotor disk pumping, and centrifugally-driven buoyant convection associated with gas turbine secondary flow systems featuring rotation. The book employs physics-based, design-oriented methodology to compute windage and swirl distributions in a complex rotor cavity formed by surfaces with arbitrary rotation, counter-rotation, and no rotation. This text will be a valuable tool for aircraft engine and industrial gas turbine design engineers as well as graduate students enrolled in advanced special topics courses.read more
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Book
Gas Turbines for Electric Power Generation
TL;DR: In this paper, the authors present an accessible discussion of electric power generation with gas turbine power plants using quantitative and qualitative tools, including a discussion of thermodynamics of gas turbine cycles from a second law perspective.
Journal ArticleDOI
Performance enhancement of the gas turbine combined cycle by simultaneous reheating, recuperation, and coolant inter-cooling
TL;DR: In this article, three cases of coolant cooling were analyzed to compensate for the power deficit and improve the efficiency: coolant inter-cooling, coolant precooling and conventional intercooling.
Journal ArticleDOI
Transient modelling and simulation of gas turbine secondary air system
TL;DR: In this paper, the secondary air system of a two-spool turbofan engine is modelled and simulated in transient mode, under two pre-defined scenarios for step and scheduled boundary condition variations.
Book ChapterDOI
GivEn—Shape Optimization for Gas Turbines in Volatile Energy Networks
Jan Backhaus,Matthias Bolten,Onur Tanil Doganay,Matthias Ehrhardt,Benedikt Engel,Christian Frey,Hanno Gottschalk,Michael Günther,Camilla Hahn,Jens Jäschke,Peter Jaksch,Kathrin Klamroth,Alexander Liefke,Daniel Luft,Lucas Mäde,Vincent Marciniak,Marco Reese,Johanna Schultes,Volker Schulz,Sebastian Schmitz,Johannes Steiner,Michael Stiglmayr +21 more
TL;DR: The project GivEn is described that develops a novel multicriteria optimization process for gas turbine blades and vanes using modern "adjoint" shape optimization algorithms to enhance the exploration of Pareto-optimal solutions.
Posted Content
An analytical study in multi physics and multi criteria shape optimization
Hanno Gottschalk,Marco Reese +1 more
TL;DR: In this article, a simple multi-physical system for the potential flow of a fluid through a shroud in which a mechanical component, like a turbine vane, is modeled mathematically.
References
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Journal ArticleDOI
The calculation of near-wake flows
Stephen B. Pope,J. H. Whitelaw +1 more
TL;DR: In this paper, the authors compared flow properties of two-dimensional isothermal wakes with and without recirculation, and found that the particular turbulence model is less important than the boundary condition assumed in the plane of the trailing edge of the body; though the Reynolds-stress models do provide a better representation of the individual normal stresses.
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The effect of turbine blade cooling on the cycle efficiency of gas turbine power cycles
TL;DR: In this paper, a thermodynamic cycle analysis computer code for the performance prediction of cooled gas turbines has been used to calculate the efficiency of plants with varying combustor outlet temperature, compressor pressure ratio, and turbomachinery polytropic efficiency.
Journal ArticleDOI
The Fluid Dynamics of a Shrouded Disk System With a Radial Outflow of Coolant
F. J. Bayley,J. M. Owen +1 more
TL;DR: In this article, an experimental study of an air-cooled gas turbine disk using the model of a disk rotating near a shrouded stator is presented. Measurements of pressure distribution, frictional moment, and cooling air flow necessary to prevent the ingress of hot gases over the turbine disk are described for a range of rotational speeds, mass flow rates, and different geometries.
Journal ArticleDOI
Two‐point correlation model and the redistribution of Reynolds stresses
D. Naot,A. Shavit,M. Wolfshtein +2 more
TL;DR: In this article, a quasi-isotropic locally homogeneous model for the two-point double-velocity correlation tensor is developed by the application of a plausible set of symmetry restrictions to this tensor.