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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
Automatic Optimization of Preswirl Nozzle Design
TL;DR: In this paper, a parametric geometric model of a preswirl nozzles with appropriate constraints is defined and the CFD meshing and solution are then automated, and the mesh generation is found to be the most delicate task in the whole process.
Book ChapterDOI
An introduction to turbulence
TL;DR: In this article, the Navier-Stokes equation is used to define the concept of turbulence, which is defined as a flow regime characterized by chaotic, stochastic property changes, such as rapid variation of pressure and velocity in space and time.
Journal ArticleDOI
Comparison of Discharge Coefficient Measurements and Correlations for Orifices With Cross-Flow and Rotation
TL;DR: Huening et al. as discussed by the authors compared test results and orifice loss calculation models from the open literature with the aid of transformation laws and contour plots, and incorporated the influence of different geometric features into a model for the calculation of discharge coefficients.
Structural Optimization Methodology for Rotating Disks of Aircraft Engines
TL;DR: In this article, a methodology has been developed for structurally designing the rotating disks of an aircraft engine, along with a previously derived methodology for predicting low-cycle fatigue life, was implemented in a computer program.
Journal ArticleDOI
Unsteady 360 Computational Fluid Dynamics Validation of a Turbine Stage Mainstream/Disk Cavity Interaction
TL;DR: In this article, an unsteady Reynolds averaged Navier-Stokes (RANS), 360-deg CFD model of the complete turbine stage was employed in order to increase the understanding of the swirl physics which dominate cavity flows and better predict rim seal ingestion.