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Wave Engine Topping Cycle Assessment

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Wave Engine Topping Cycle Assessment

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Author :
language : en
Publisher:
Release Date : 1996

Wave Engine Topping Cycle Assessment written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.

Wave Turbine Analysis Tool Development

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Author : Gerard E. Welch
language : en
Publisher:
Release Date : 1998

Wave Turbine Analysis Tool Development written by Gerard E. Welch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.

A quasi-one-dimensional (Q-1-D) computational fluid dynamic solver, previously developed and validated for pressure-exchanger wave rotors, is extended in the present work to include the blade forces of power producing wave rotors (i.e., wave turbines). The accuracy of the single-passage Q-1-D solver is assessed relative to two two-dimensional solvers: a single-passage code and a multi-block stator/rotor/stator code. Comparisons of computed results for inviscid, steady and unsteady flows in passage geometries typical of wave rotors reveal that the blade force model is accurate and that the correlation (effective stress and heat flux) terms of the Q-1-D passage-averaged formulation can be neglected. The ends of the rotor passages pose particular challenges to Q-1-D formulations because the flow there must at times deviate significantly from the mean camber line angle to match the port flow fields. This problem is most acute during the opening and closing of the rotor passages. An example sub-model is developed to account for the deviation between the flow departure angle and the mean camber line exit angle that occurs as an inviscid flow decelerates to meet a uniform pressure boundary. Comparisons of results from four-port wave turbine simulations reveal that the Q-1-D solver currently overpredicts wave turbine performance levels and highlight the need to devote future effort to the boundary conditions and sub-models of the Q-1-D solver.

Wave Engine Topping Cycle Assessment

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Author : Gerard E. Welch
language : en
Publisher:
Release Date : 1996

Wave Engine Topping Cycle Assessment written by Gerard E. Welch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Elastic waves categories.

Wave Rotor Enhanced Gas Turbine Engine Demonstrator

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Author :
language : en
Publisher:
Release Date : 1999

Wave Rotor Enhanced Gas Turbine Engine Demonstrator written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.

The U.S. Army Research Laboratory, NASA Glenn Research Center, and Rolls-Royce Allison are working collaboratively to demonstrate the benefits and viability of a wave-rotor-topped gas turbine engine. The self-cooled wave rotor is predicted to increase the engine overall pressure ratio and peak temperature by 300% and 25 to 30%, respectively, providing substantial improvements in engine efficiency and specific power. Such performance improvements would significantly reduce engine emissions and the fuel logistics trails of armed forces. Progress towards a planned demonstration of a wave-rotor-topped Rolls-Royce Allison model 250 engine has included completion of the preliminary design and layout of the engine, the aerodynamic design of the wave rotor component and prediction of its aerodynamic performance characteristics in on- and off-design operation and during transients, and the aerodynamic design of transition ducts between the wave rotor and the high pressure turbine. The topping cycle increases the burner entry temperature and poses a design challenge to be met in the development of the demonstrator engine.

Passage Averaged Description Of Wave Rotor Flow

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Author : Gerard E. Welch
language : en
Publisher:
Release Date : 1997

Passage Averaged Description Of Wave Rotor Flow written by Gerard E. Welch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.

The unsteady flow within wave rotor passages is influenced by the rotor blade, hub, and tip shroud surface profiles. By averaging from hub to shroud and from blade to blade, a reduced set of the governing equations is obtained that is appropriate for design studies and parametric analyses. The application of these equations requires closure models for force integrals and for correlation terms that arise when the density averages of products of the flow field variables are expanded in terms of products of the density-averaged variables. The force integrals and the correlation terms depend on the instantaneous pitchwise and spanwise flow field distributions established by unsteadiness relative to the rotor, flow turning induced by blade, hub, and tip-shroud profiling, and rotation. Two approaches to model the force integrals are described. The influence of relative unsteadiness and flow turning on the correlation terms is discussed by considering the propagation of gas dynamic waves in rotor passages defined by uncambered, staggered blades and by unstaggered, cambered blades.

Performance Prediction And Preliminary Design Of Wave Rotors Enhancing Gas Turbine Cycles

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Author : Pezhman Akbari
language : en
Publisher:
Release Date : 2004

Performance Prediction And Preliminary Design Of Wave Rotors Enhancing Gas Turbine Cycles written by Pezhman Akbari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Gas-turbines categories.