Three Dimensional Internal Flows In Turbomachinery
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Three Dimensional Internal Flows In Turbomachinery
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Author : Kirti N. Ghia
language : en
Publisher:
Release Date : 1980
Three Dimensional Internal Flows In Turbomachinery written by Kirti N. Ghia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
Several aspects of viscous internal flows, related to turbomachinery applications, are examined and studied with the use of appropriate model problems. Laminar as well as turbulent flows are considered. In particular, duct flows are studied in detail so as to better understand the physical phenomena occurring therein. This enables their appropriate formulation and, consequently, permits accurate numerical solutions to be obtained efficiently. Configurations involving complex geometry, transverse curvature, longitudinal curvature and streamwise flow separation are studied in detail. Turbulent flows through regular cross-section ducts are studied via the use of a two-equation model for the turbulence kinetic energy and its dissipation rate. Two approaches for treating the wall regions are examined and compared. Detailed results are obtained for flow through curved ducts of polar cross section. Some effort is also made towards modelling anisotropy and compressibility in turbulent flow using simple model problems. In the entire study, emphasis is given to the accuracy and efficiency of the numerical solutions. This has involved the study and implementation of implicit and semi-implicit numerical schemes of higher-order accuracy and higher efficiency. (Author).
Three Dimensional Internal Flows In Turbomachinery
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Author : Awatef A. Hamed
language : en
Publisher:
Release Date : 1980
Three Dimensional Internal Flows In Turbomachinery written by Awatef A. Hamed and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
This report describes an efficient numerical scheme developed for investigating secondary flows, and outlines the design of an experimental set-up for obtaining detail in channel three dimensional secondary flow measurements. The analysis applies to inviscid internal rotational flow fields and leads to a very efficient numerical scheme for predicting the secondary flow phenomena. The analysis is applied to the rotational flow in a 90 deg bend with rectangular cross-section and then compared with the experimental data. It is concluded from the comparison that the physics of the secondary flow problem are well represented in the analysis. The analysis can be adapted with some modifications to variable area ducts, and turbomachinery passages. (Author).
Three Dimensional Internal Flows In Turbomachinery Task 1 Secondary Flow In Diffusing Cascades
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Author : Awatef A. Hamed
language : en
Publisher:
Release Date : 1979
Three Dimensional Internal Flows In Turbomachinery Task 1 Secondary Flow In Diffusing Cascades written by Awatef A. Hamed and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
The nonviscous three-dimensional rotational flow is analyzed in highly curved channels. The problem is formulated in terms of the velocity and vorticity. The secondary velocities are computed for the continuity and vorticity equations, which are nonhomogeneous first order equations. Previous formulations of these equations resulted in two second order differential equations. A new approach is developed, which is applicable in a generalized two dimensional domain or axisymmetric field. It is based on the definition of a streamlike function which is used to transform these nonhomogeneous first order partial differential equations to a single second order equation with Dirichlet boundary conditions over the solid boundaries. The new approach is superior in terms of computational time and storage requirements. (Author).
Study Of Three Dimensional Internal Flow Problems Related To Turbomachinery Flows
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Author : Kirti N. Ghia
language : en
Publisher:
Release Date : 1979
Study Of Three Dimensional Internal Flow Problems Related To Turbomachinery Flows written by Kirti N. Ghia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
The primary objective of this two-year research project is to develop a finite-difference numerical technique for the solution of the parabolized Navier-Stokes equations using a system of surface-oriented coordinates suitable for ducts of arbitrary geometry. An additional objective to be fulfilled by this research consists of developing an analysis for laminar duct flow with stream wise separation using mathematical models simpler than the full Navier-Stokes equations. In order to achieve the above objectives, the following three problems have been studied during the first year of the two-year contract period: I. Laminar Flow through Joukowski ducts, II. Laminar flow through curved polar ducts, and III. Analysis of laminar streamwise flow separation via a semi-elliptic mathematical model. In each phase of the research attention is given to the accuracy of the numerical solutions as well as the efficiency with which they can be determined. For this purpose, the following two additonal areas have been studied: iv. Higher accuracy of numerical solutions, and v. Efficient numerical algorithms. Suitable model problems have been selected wherever required, in this research, with the overall goal of contributing to further the understanding of internal flows in turbomachinery. Each of the above research areas is described in this report. (Author).
Analytical Investigation Of Some Three Dimensional Flow Problems In Turbomachines
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Author : Frank E. Marble
language : en
Publisher:
Release Date : 1952
Analytical Investigation Of Some Three Dimensional Flow Problems In Turbomachines written by Frank E. Marble and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1952 with Axial flow categories.
The flow of an incompressible inviscid fluid through a turbomachine with blade rows consisting of an infinite number of similar infinitely thin blades has been investigated theoretically in order to examine and describe the three-dimensional flow phenomena and to illustrate the methods of calculation developed.
Analysis Of Three Dimensional Viscous Internal Flows
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Author : Kirti N. Ghia
language : en
Publisher:
Release Date : 1985
Analysis Of Three Dimensional Viscous Internal Flows written by Kirti N. Ghia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.
The objective of this study was to acquire improved understanding of viscous interanl flows related to turbomachinery compents by analyzing appropriate model flow problems. Significant effort was directed towards developing basic computational methods which were made available to interested researchers involved in computational fluid dynamics (CFD) research and to users involved in the designof turbomachinery components. Several analyses were developed and include an asymptotic analysis for the fully developed three-dimensional flow in curved ducts, a parabolilzed navier-Strokes analysis for developing flow in curved ducts, an unsteady Navier-Strokes analysis for internal and externall flows, adaptive grid generation for one and two dimensional vilscous flows, analysis of the Neumann problem in generalized orthogonal coordinates, efficient semi-implicit solution techniques consisting of the alternating direction implicit multi grid and strongly implicit multi grid methods, the direct block Gaussian elimination(GBE) method for solution of the Poisson equation for the unsteady Navier Strokes analysis of incompressible flows. For the flow inside a shear driven cavity, the asymptotic flow in curved ducts and clarity for interpretation of the available corresponding experimental results and have now become benchmark solutions for these problems.
Three Dimensional Flow In Radial Turbomachinery And Its Impact On Design
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher: Independently Published
Release Date : 2019-01-03
Three Dimensional Flow In Radial Turbomachinery And Its Impact On Design written by National Aeronautics and Space Adm Nasa and has been published by Independently Published this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-01-03 with categories.
In the two papers on the 'Theory of Blade Design for Large Deflections' published in 1984, a new inverse design technique was presented for designing the shape of turbomachinery blades in three-dimensional flow. The technique involves the determination of the blade profile from the specification of a distribution of the product of the radius and the pitched averaged tangential velocity (i.e., r bar-V(sub theta), the mean swirl schedule) within the bladed region. This is in contrast to the conventional inverse design technique for turbomachinery blading in two dimensional flow in which the blade surface pressure or velocity distribution is specified and the blade profile determined as a result; this is feasible in two-dimensional flow because the streamlines along the blade surfaces are known a priori. However, in three-dimensional flow, the stream surface is free to deform within the blade passage so that the streamlines on the blade surfaces are not known a priori; thus it is difficult and not so useful to prescribe the blade surface pressure or velocity distribution and determine the resulting blade profile. It therefore seems logical to prescribe the swirl schedule within the bladed region for designing a turbomachinery blade profile in three-dimensional flow. Furthermore, specifying r bar-V(sub theta) has the following advantages: (1) it is related to the circulation around the blade (i.e., it is an aerodynamic quantity); (2) the work done or extracted is approximately proportional to the overall change in r bar-V(sub theta) across a given blade row (Euler turbine equation); and (3) the rate of change of r bar-V(sub theta) along the mean streamline at the blade is related to the pressure jump across the blade and therefore the blade loading. Since the publications of those two papers, the technique has been applied to the design of a low speed as well as a high speed radial inflow turbine (for turbocharger applications) both of which showed definite improvements...
Turbomachinery Flow Physics And Dynamic Performance
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Author : Meinhard T. Schobeiri
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-05-01
Turbomachinery Flow Physics And Dynamic Performance written by Meinhard T. Schobeiri and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-05-01 with Technology & Engineering categories.
With this second revised and extended edition, the readers have a solid source of information for designing state-of-the art turbomachinery components and systems at hand. Based on fundamental principles of turbomachinery thermo-fluid mechanics, numerous CFD based calculation methods are being developed to simulate the complex 3-dimensional, highly unsteady turbulent flow within turbine or compressor stages. The objective of this book is to present the fundamental principles of turbomachinery fluid-thermodynamic design process of turbine and compressor components, power generation and aircraft gas turbines in a unified and compact manner. The book provides senior undergraduate students, graduate students and engineers in the turbomachinery industry with a solid background of turbomachinery flow physics and performance fundamentals that are essential for understanding turbomachinery performance and flow complexes. While maintaining the unifying character of the book structure in this second revised and extended edition all chapters have undergone a rigorous update and enhancement. Accounting for the need of the turbomachinery community, three chapters have been added, that deal with computationally relevant aspects of turbomachinery design such as boundary layer transition, turbulence and boundary layer.
Aerothermodynamics Of Turbomachinery
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Author : Naixing Chen
language : en
Publisher: John Wiley & Sons
Release Date : 2011-09-23
Aerothermodynamics Of Turbomachinery written by Naixing Chen and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-09-23 with Science categories.
Computational Fluid Dynamics (CFD) is now an essential and effective tool used in the design of all types of turbomachine, and this topic constitutes the main theme of this book. With over 50 years of experience in the field of aerodynamics, Professor Naixing Chen has developed a wide range of numerical methods covering almost the entire spectrum of turbomachinery applications. Moreover, he has also made significant contributions to practical experiments and real-life designs. The book focuses on rigorous mathematical derivation of the equations governing flow and detailed descriptions of the numerical methods used to solve the equations. Numerous applications of the methods to different types of turbomachine are given and, in many cases, the numerical results are compared to experimental measurements. These comparisons illustrate the strengths and weaknesses of the methods – a useful guide for readers. Lessons for the design of improved blading are also indicated after many applications. Presents real-world perspective to the past, present and future concern in turbomachinery Covers direct and inverse solutions with theoretical and practical aspects Demonstrates huge application background in China Supplementary instructional materials are available on the companion website Aerothermodynamics of Turbomachinery: Analysis and Design is ideal for senior undergraduates and graduates studying in the fields of mechanics, energy and power, and aerospace engineering; design engineers in the business of manufacturing compressors, steam and gas turbines; and research engineers and scientists working in the areas of fluid mechanics, aerodynamics, and heat transfer. Supplementary lecture materials for instructors are available at www.wiley.com/go/chenturbo
A General Theory Of Three Dimensional Flow In Subsonic And Supersonic Turbomachines Of Axial Radial And Mixed Flow Types
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Author : Chung-Hua Wu
language : en
Publisher:
Release Date : 1952
A General Theory Of Three Dimensional Flow In Subsonic And Supersonic Turbomachines Of Axial Radial And Mixed Flow Types written by Chung-Hua Wu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1952 with categories.
A general theory of steady three-dimensional flow of a nonviscous fluid in subsonic and supersonic turbomachines having arbitrary hub and casing shapes and a finite number of blades is presented, The solution of the three-dimensional direct and inverse problem is obtained by investigating an appropriate combination of flows on relative stream surfaces whose intersections with a z-plane either upstream of or some- where inside the blade row form a circular arc or a radial line. The equations obtained to describe the fluid flow on these stream surfaces show clearly the several approximations involved in ordinary two-dimensional treatments. They also lead to a solution of the three-dimensional problem in a mathematically two-dimensional manner through iteration. The equation of continuity is combined with the equation of motion in either the tangential or the radial direction through the use of a stream function defined on the surface, and the resulting equation is chosen as the principal equation for such flows. The character of this equation depends on the relative magnitude of the local velocity of sound and a certain combination of velocity components of the fluid. A general method to solve this equation by both hand and high-speed digital machine computations when the equation is elliptic or hyperbolic is described. The theory is applicable to both irrotational and rotational absolute flow at the inlet of the blade row and at both design and off-design operations.
