Validation of Viscous, Three-dimensional Flow Calculations in an Axial Turbine Cascade
Author : James Gilbert Edwin Cleak
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Page : pages
File Size : 24,38 MB
Release : 1989
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Author : James Gilbert Edwin Cleak
Publisher :
Page : pages
File Size : 24,38 MB
Release : 1989
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Author : James Gilbert Edwin Cleak
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Page : pages
File Size : 12,78 MB
Release : 1989
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Author : L. Walitt
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Page : 77 pages
File Size : 37,93 MB
Release : 1984
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A three-dimensional viscous computer code (VANS/MD) was employed to calculate the turbulent flow field at the end wall leading edge region of a 20 inch axial annular turbine cascade. The initial boundary layer roll-up and formation of the end wall vortices were computed at the vane leading edge. The calculated flow field was found to be periodic with a frequency of approximately 1600 Hz. The calculated size of the separation region for the hub endwall vortex compared favorably with measured endwall oil traces. In an effort to determine the effects of the turbulence model on the calculated unsteadiness, a laminar calculation was made. The periodic nature of the calculated flow field persisted with the frequency essentially unchanged. Additional author assigned keywords include: Axial flow turbines, Secondary flow and Vortices.
Author : J. G. E. Cleak
Publisher :
Page : 15 pages
File Size : 13,15 MB
Release : 1992
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A Navier-Stokes computer code has been used for the calculation of the three-dimensional secondary flow in a cascade of axial turbine blades. A comparison is made with experiment of the results of various applications of a mixing length model within the code. The results are compared on the basis of mean flow data and also turbulent Reynolds shear stresses. Substantial grid independence was obtained with a grid of 20,000 points; further grid refinement had a significant effect only on mids an loss.
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Page : 488 pages
File Size : 33,27 MB
Release : 1995
Category : Aeronautics
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author : National Aeronautics and Space Adm Nasa
Publisher :
Page : 28 pages
File Size : 24,31 MB
Release : 2018-10-23
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ISBN : 9781729091890
A 3-D code for viscous cascade flow prediction was developed. The space discretization uses a cell-centered scheme with eigenvalue scaling to weigh the artificial dissipation terms. Computational efficiency of a four stage Runge-Kutta scheme is enhanced by using variable coefficients, implicit residual smoothing, and a full multigrid method. The Baldwin-Lomax eddy viscosity model is used for turbulence closure. A zonal, nonperiodic grid is used to minimize mesh distortion in and downstream of the throat region. Applications are presented for an annular vane with and without end wall contouring, and for a large scale linear cascade. The calculation is validated by comparing with experiments and by studying grid dependency. Arnone, A. and Liou, M.-S. and Povinelli, L. A. Glenn Research Center NASA ORDER C-99066-G; RTOP 505-62-21...
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Page : 538 pages
File Size : 44,47 MB
Release : 1991
Category : Aeronautics
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Page : 796 pages
File Size : 17,70 MB
Release : 1998
Category : Mechanical engineering
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Author : Naixing Chen
Publisher : John Wiley & Sons
Page : 448 pages
File Size : 36,59 MB
Release : 2011-09-23
Category : Science
ISBN : 0470825014
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
Author : H. Zimmermann
Publisher :
Page : pages
File Size : 50,34 MB
Release : 1990
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