Detailed Measurements of the Periodically Unsteady Flow Produced by Rotor and Stator Wake Interaction in a Multistage Axial-flow Turbo-machine PDF Download
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Author: Douglas Paul Schmidt
Publisher:
ISBN:
Category :
Languages : en
Pages : 434
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Book Description
Author: Douglas Paul Schmidt
Publisher:
ISBN:
Category :
Languages : en
Pages : 434
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Book Description
Author: Joel Herman Wagner
Publisher:
ISBN:
Category : Turbomachines
Languages : en
Pages : 113
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Book Description
A periodic-average flow measurement technique involving a hot-wire anemometer system was used to measure the periodically unsteady and three-dimensional fluid velocity field between blade rows in the first stage of a low-speed, multistage, axial-flow research compressor. These data suggest that the fluid flow through the imbedded rotor and stator rows is appreciably unsteady, in a periodic fashion in portions of the compressor annulus. Illustrative examples of periodic-average fluid flow field variation with rotor blade sampling postition in stop-action sequence are presented for different locations in the compressor. A simple, first order approximation physical description of the blade wake flow transport and interaction process largely based on experimental data interpretation is proposed to organize and to help explain the observations made. Blade span variations of flow data reflect end-wall effects. Inlet guide vane exit flow data involve some unusual unsteady flow effects. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 332
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Author: H. P. Hodson
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Earl Logan, Jr.
Publisher: CRC Press
ISBN: 0824748476
Category : Technology & Engineering
Languages : en
Pages : 829
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Book Description
Building on the success of its predecessor, Handbook of Turbomachinery, Second Edition presents new material on advances in fluid mechanics of turbomachinery, high-speed, rotating, and transient experiments, cooling challenges for constantly increasing gas temperatures, advanced experimental heat transfer and cooling effectiveness techniques, and propagation of wake and pressure disturbances. Completely revised and updated, it offers updated chapters on compressor design, rotor dynamics, and hydraulic turbines and features six new chapters on topics such as aerodynamic instability, flutter prediction, blade modeling in steam turbines, multidisciplinary design optimization.
Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 644
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Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 444
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 538
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Author:
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 452
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Book Description
Author: Theordore H. Okiishi
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
Procedures and instrumentation for acquiring time-average (slow response average of continuously sampled data) and periodic-average (electronic and arithmetic average of periodically sampled data) flow field data between blade rows of a research turbomachine were developed. Slow and fast-response total pressure probes and hot-wire anemometry were involved. A special 5 microsec sampling and holding circuit that could be phase locked to reference rotor blade position was designed and built. Two-dimensional time-average and three-dimensional periodic-average velocity vector information was obtained. Observed time-average flow patterns involved appreciable circumferential variations behind both rotors and stators and they could be changed significantly by circumferentially shifting upstream stationary blades. Observed periodic-average flow patterns showed that rotor and stator flow fields are 3-dimensional as well as periodically unsteady. A simple wake chopping transport and interaction model based on experimental data proved to be an excellent means for organizing and explaining data trends. Variations of periodic-average flow patterns with rotor sampling position could be understood in terms of the wake chopping, transport and interaction model proposed. Compressor inlet noise measurements indicated that blade-passing frequency noise level could be changed substantially with appropriate stationary blade row circumferential positioning when the same number of blades was present in each stationary blade row and when the spinning blade interaction pattern speed was above the cut-off amount. (EDC).
