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Book Development of Unsteady Aerodynamic Analyses for Turbomachinery Aeroelastic and Aeroacoustic Applications

Download or read book Development of Unsteady Aerodynamic Analyses for Turbomachinery Aeroelastic and Aeroacoustic Applications written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical analyses and computer codes are being developed for predicting compressible unsteady inviscid and viscous flows through blade rows. Such analyses are needed to determine the impact of unsteady flow phenomena on the structural durability and noise generation characteristics of turbomachinery blading. Emphasis is being placed on developing analyses based on asymptotic representations of unsteady flow phenomena. Thus, flow driven by small-amplitude unsteady excitations in which viscous effects are concentrated in thin layers are being considered. The resulting analyses should apply in many practical situations, lead to a better understanding of the relevent physics, and they will be efficient computationally, and therefore, appropriate for aeroelastic and aeroacoustic design applications. Under the present phase (Task 3), the effort was focused on providing inviscid and viscid prediction capabilities for subsonic unsteady cascade flows. Verdon, Joseph M. and Barnett, Mark and Hall, Kenneth C. and Ayer, Timothy C. Unspecified Center AEROACOUSTICS; AEROELASTICITY; AIRCRAFT DESIGN; COMPUTER PROGRAMS; DESIGN ANALYSIS; PREDICTION ANALYSIS TECHNIQUES; TURBOMACHINERY; UNSTEADY AERODYNAMICS; CASCADE FLOW; COMPRESSIBLE FLOW; DURABILITY; INVISCID FLOW; NOISE GENERATORS; SUBSONIC FLOW; UNSTEADY FLOW; VISCOUS FLOW...

Book Unsteady Aerodynamics Aeroacoustics and Aeroelasticity of Turbomachines and Propellers

Download or read book Unsteady Aerodynamics Aeroacoustics and Aeroelasticity of Turbomachines and Propellers written by H.M. Atassi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 876 pages. 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.

Book Unsteady Aerodynamics Aeroacoustics and Aeroelasticity of Turbomachines

Download or read book Unsteady Aerodynamics Aeroacoustics and Aeroelasticity of Turbomachines written by Kenneth C. Hall and published by Springer Science & Business Media. This book was released on 2006-03-08 with total page 648 pages. 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.

Book Unsteady Aerodynamics and Aeroelasticity of Turbomachines

Download or read book Unsteady Aerodynamics and Aeroelasticity of Turbomachines written by Torsten H. Fransson and published by Springer Science & Business Media. This book was released on 1998-06-30 with total page 882 pages. 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.

Book Unsteady Aerodynamic Models for Turbomachinery Aeroelastic and Aeroacoustic Applications

Download or read book Unsteady Aerodynamic Models for Turbomachinery Aeroelastic and Aeroacoustic Applications written by Joseph M. Verdon and published by . This book was released on 1995 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Unsteady Aerodynamics Aeroacoustics and Aeroelasticity of Turbomachines and Propellers

Download or read book Unsteady Aerodynamics Aeroacoustics and Aeroelasticity of Turbomachines and Propellers written by H.M. Atassi and published by Springer. This book was released on 1993-03-25 with total page 889 pages. 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.

Book Unsteady Aerodynamics and Aeroelasticity of Turbomachines

Download or read book Unsteady Aerodynamics and Aeroelasticity of Turbomachines written by Torsten H. Fransson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 835 pages. 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.

Book Development of a Linearized Unsteady Euler Analysis for Turbomachinery Blade Rows

Download or read book Development of a Linearized Unsteady Euler Analysis for Turbomachinery Blade Rows written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: A linearized unsteady aerodynamic analysis for axial-flow turbomachinery blading is described in this report. The linearization is based on the Euler equations of fluid motion and is motivated by the need for an efficient aerodynamic analysis that can be used in predicting the aeroelastic and aeroacoustic responses of blade rows. The field equations and surface conditions required for inviscid, nonlinear and linearized, unsteady aerodynamic analyses of three-dimensional flow through a single, blade row operating within a cylindrical duct, are derived. An existing numerical algorithm for determining time-accurate solutions of the nonlinear unsteady flow problem is described, and a numerical model, based upon this nonlinear flow solver, is formulated for the first-harmonic linear unsteady problem. The linearized aerodynamic and numerical models have been implemented into a first-harmonic unsteady flow code, called LINFLUX. At present this code applies only to two-dimensional flows, but an extension to three-dimensions is planned as future work. The three-dimensional aerodynamic and numerical formulations are described in this report. Numerical results for two-dimensional unsteady cascade flows, excited by prescribed blade motions and prescribed aerodynamic disturbances at inlet and exit, are also provided to illustrate the present capabilities of the LINFLUX analysis. Verdon, Joseph M. and Montgomery, Matthew D. and Kousen, Kenneth A. Unspecified Center AXIAL FLOW; COMPUTATIONAL FLUID DYNAMICS; DIFFERENTIAL EQUATIONS; EULER EQUATIONS OF MOTION; INVISCID FLOW; LINEARIZATION; ROTOR BLADES (TURBOMACHINERY); SURFACE PROPERTIES; THREE DIMENSIONAL FLOW; UNSTEADY AERODYNAMICS; AEROACOUSTICS; AERODYNAMIC CONFIGURATIONS; AEROELASTICITY; AIR INTAKES; CASCADE FLOW; CYLINDRICAL BODIES; DUCTS; MATHEMATICAL MODELS; UNSTEADY FLOW...

Book Unsteady Flow and Aeroelasticity in Turbomachinery

Download or read book Unsteady Flow and Aeroelasticity in Turbomachinery written by Li He and published by Academic Press. This book was released on 2016-03-01 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Blade aeroelasticity has long been regarded a distinctive and critical topic in aerospace and turbomachinery design. More recently, research activities have increased in the area of turbomachinery unsteady flows, and whilst the two topics have seemingly different applications, the many links between them give value to a complementary approach. Unsteady Flow and Aeroelasticity in Turbomachinery is the first high level reference to provide detailed, multi-disciplinary discussion of these related topics and their increasing importance in efforts to develop low-emission and low-noise engines and generators. Filling the need for a well-written book to bring together recent research developments, author Li He seeks to take a unified approach, with emphasis given to physical understanding of the various phenomena and relevant modeling issues before discussion of prediction methods and techniques. This unique resource is aimed at those facing unsteady aerodynamic or aeroelastic problems and aims to help engineers and researchers to overcome challenges in academic, industrial R&D and engine design environments. There are other books on unsteady aerodynamics, and aeroelasticity. The uniqueness is in writing a book focused on these topics in turbomachinery. Rare unified coverage of two closely related topics critical to aero-engine and gas turbine development. Full development of key topics from theoretical background to practical problem solving R&D and design environments Authored by a leading expert from the world-renowned University of Oxford Osney Thermo-Fluids Lab, whose research output forms a key part of Rolls-Royce's research strategy

Book Development of a Linearized Unsteady Aerodynamic Analysis for Cascade Gust Response Predictions

Download or read book Development of a Linearized Unsteady Aerodynamic Analysis for Cascade Gust Response Predictions written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-02 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for predicting the unsteady aerodynamic response of a cascade of airfoils to entropic, vortical, and acoustic gust excitations is being developed. Here, the unsteady flow is regarded as a small perturbation of a nonuniform isentropic and irrotational steady background flow. A splitting technique is used to decompose the linearized unsteady velocity into rotational and irrotational parts leading to equations for the complex amplitudes of the linearized unsteady entropy, rotational velocity, and velocity potential that are coupled only sequentially. The entropic and rotational velocity fluctuations are described by transport equations for which closed-form solutions in terms of the mean-flow drift and stream functions can be determined. The potential fluctuation is described by an inhomogeneous convected wave equation in which the source term depends on the rotational velocity field, and is determined using finite-difference procedures. The analytical and numerical techniques used to determine the linearized unsteady flow are outlined. Results are presented to indicate the status of the solution procedure and to demonstrate the impact of blade geometry and mean blade loading on the aerodynamic response of cascades to vortical gust excitations. The analysis described herein leads to very efficient predictions of cascade unsteady aerodynamic response phenomena making it useful for turbomachinery aeroelastic and aeroacoustic design applications. Verdon, Joseph M. and Hall, Kenneth C. Unspecified Center...

Book Unsteady Aerodynamics and Aeroelasticity of Turbomachines

Download or read book Unsteady Aerodynamics and Aeroelasticity of Turbomachines written by Yoshimichi Tanida and published by Elsevier Publishing Company. This book was released on 1995 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contributed papers in this volume cover a variety of unsteady flow phenomena in turbomachines. They present theoretical and numerical modellings plus experimental techniques and findings on the unsteady flows in turbomachines.