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Calculation of Unsteady Linearized Euler Flows in Cascades Using Harmonically Deforming Grids

2018-08-16
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Release : 2018-08-16
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Kind : eBook
Book Rating : 888/5 ( reviews)

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Book Synopsis Calculation of Unsteady Linearized Euler Flows in Cascades Using Harmonically Deforming Grids by : National Aeronautics and Space Administration (NASA)

Download or read book Calculation of Unsteady Linearized Euler Flows in Cascades Using Harmonically Deforming Grids written by National Aeronautics and Space Administration (NASA). This book was released on 2018-08-16. Available in PDF, EPUB and Kindle. Book excerpt: A method for calculating unsteady, inviscid, compressible flows in cascades is presented. Using the linearized Euler technique, the flow is decomposed into a steady or mean flow plus a harmonically varying small disturbance flow. The equations that describe the small disturbance flow are linear variable coefficient equations, and are solved using a pseudo-time time marching Lax-Wendroff technique. Unlike previous linearized methods, however, the solution is computed on a harmonically deforming computational grid that conforms to the motion of the vibrating airfoils. The mean flow and perturbation flow solutions are defined in the deforming coordinate system rather than in a coordinate system fixed in space. Hence, no extrapolation terms are required to implement the upwash boundary conditions at the airfoil surfaces, significantly improving the accuracy of the method. For transonic flow calculations, unsteady shock motions are modelled using shock capturing. The unsteady loads due to the shock motion are then seen as pressure impulses. Representative computational results are presented for transonic channel flows and subsonic and transonic cascade flows. Hall, Kenneth C. and Clark, William S. Unspecified Center NASA-CR-188916, NAS 1.26:188916 NAG3-1192...

Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines and Propellers

2012-12-06 Science
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Release : 2012-12-06
Genre : Science
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Book Rating : 418/5 ( reviews)

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Book Synopsis Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines and Propellers by : H.M. Atassi

Download or read book Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines and Propellers written by H.M. Atassi. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: The first International Symposium on Unsteady Aerodynamics and Aero elasticity of Turbomachines was held in Paris in 1976, and was followed by symposia at Lausanne in 1980, Cambridge in 1984, Aachen in 1987, Bei jing in 1989, and Notre Dame in 1991. The proceedings published following these symposia have become recognized both as basic reference texts in the subject area and as useful guides to progress in the field. It is hoped that this volume, which represents the proceedings of the Sixth International Symposium on Unsteady Aerodynamics of Turbomachines, will continue that tradition. Interest in the unsteady aerodynamics, aeroacoustics, and aeroelasticity of turbomachines has been growing rapidly since the Paris symposium. This expanded interest is reflected by a significant increase in the numbers of contributed papers and symposium participants. The timeliness of the topics has always been an essential objective of these symposia. Another important objective is to promote an international exchange between scien tists and engineers from universities, government agencies, and industry on the fascinating phenomena of unsteady turbomachine flows and how they affect the aeroelastic stability of the blading system and cause the radiation of unwanted noise. This exchange acts as a catalyst for the development of new analytical and numerical models along with carefully designed ex periments to help understand the behavior of such systems and to develop predictive tools for engineering applications.

Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines

2006-05-11 Technology & Engineering
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Release : 2006-05-11
Genre : Technology & Engineering
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Book Rating : 057/5 ( reviews)

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Book Synopsis Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines by : Kenneth C. Hall

Download or read book Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines written by Kenneth C. Hall. This book was released on 2006-05-11. Available in PDF, EPUB and Kindle. Book excerpt: This textbook is a collection of technical papers that were presented at the 10th International Symposium on Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines held September 8-11, 2003 at Duke University in Durham, North Carolina. The papers represent the latest in state of the art research in the areas of aeroacoustics, aerothermodynamics, computational methods, experimental testing related to flow instabilities, flutter, forced response, multistage, and rotor-stator effects for turbomachinery.

Unsteady Aerodynamics and Aeroelasticity of Turbomachines

2012-12-06 Science
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Release : 2012-12-06
Genre : Science
Kind : eBook
Book Rating : 400/5 ( reviews)

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Book Synopsis Unsteady Aerodynamics and Aeroelasticity of Turbomachines by : Torsten H. Fransson

Download or read book Unsteady Aerodynamics and Aeroelasticity of Turbomachines written by Torsten H. Fransson. This book was released on 2012-12-06. Available in PDF, EPUB and Kindle. Book excerpt: Twenty-one years have passed since the first symposium in this series was held in Paris (1976). Since then there have been meetings in Lausanne (1980), Cambridge (1984), Aachen (1987), Beijing (1989), Notre Dame (1991) and Fukuoka (1994). During this period a tremendous development in the field of unsteady aerodynamics and aeroelasticity in turbomachines has taken place. As steady-state flow conditions become better known, and as blades in the turbomachine are constantly pushed towards lower weight, and higher load and efficiency, the importance of unsteady phenomena appear more clearly. th The 8 Symposium was, as the previous ones, of high quality. Furthermore, it presented the audience with the latest developments in experimental, numerical and theoretical research. More papers than ever before were submitted to the conference. As the organising committee wanted to preserve the uniqueness of the symposium by having single sessions, and thus mingle speakers and audience with different backgrounds in this interdisciplinary field, only a limited number of papers could be accepted. 54 papers were accepted and presented at the meeting, all of which are included in the present proceedings.

Scientific and Technical Aerospace Reports

1995 Aeronautics
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Release : 1995
Genre : Aeronautics
Kind : eBook
Book Rating : /5 ( reviews)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by . This book was released on 1995. Available in PDF, EPUB and Kindle. Book excerpt:

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