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Three Dimensional Viscous Flow Field In An Axial Flow Turbine Nozzle Passage
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723458651 Total Pages :198 pages Book Rating :4.4/5 (586 download)
Book Synopsis Three Dimensional Viscous Flow Field in an Axial Flow Turbine Nozzle Passage by : National Aeronautics and Space Administration (NASA)
Download or read book Three Dimensional Viscous Flow Field in an Axial Flow Turbine Nozzle Passage written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this investigation is experimental and computational study of three dimensional viscous flow field in the nozzle passage of an axial flow turbine stage. The nozzle passage flow field has been measured using a two sensor hot-wire probe at various axial and radial stations. In addition, two component LDV measurements at one axial station (x/c(sum m) = 0.56) were performed to measure the velocity field. Static pressure measurements and flow visualization, using a fluorescent oil technique, were also performed to obtain the location of transition and the endwall limiting streamlines. A three dimensional boundary layer code, with a simple intermittency transition model, was used to predict the viscous layers along the blade and endwall surfaces. The boundary layers on the blade surface were found to be very thin and mostly laminar, except on the suction surface downstream of 70% axial chord. Strong radial pressure gradient, especially close to the suction surface, induces strong cross flow components in the trailing edge regions of the blade. On the end-walls the boundary layers were much thicker, especially near the suction corner of the casing surface, caused by secondary flow. The secondary flow region near the suction-casing surface corner indicates the presence of the passage vortex detached from the blade surface. The corner vortex is found to be very weak. The presence of a closely spaced rotor downstream (20% of the nozzle vane chord) introduces unsteadiness in the blade passage. The measured instantaneous velocity signal was filtered using FFT square window to remove the periodic unsteadiness introduced by the downstream rotor and fans. The filtering decreased the free stream turbulence level from 2.1% to 0.9% but had no influence on the computed turbulence length scale. The computation of the three dimensional boundary layers is found to be accurate on the nozzle passage blade surfaces, away from the end-walls and the secondary flow region. On ...
Book Synopsis Three Dimensional Viscous Flow Field in an Axial Flow Turbine Nozzle Passage by : D. Ristic
Download or read book Three Dimensional Viscous Flow Field in an Axial Flow Turbine Nozzle Passage written by D. Ristic and published by . This book was released on 1997 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Three Dimensional Flow Field at the Exit of an Axial-Flow Turbine Rotor by : National Aeronautics and Space Adm Nasa
Download or read book The Three Dimensional Flow Field at the Exit of an Axial-Flow Turbine Rotor written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-09 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: A systematic and comprehensive investigation was performed to provide detailed data on the three dimensional viscous flow phenomena downstream of a modem turbine rotor and to understand the flow physics such as origin, nature, development of wakes, secondary flow, and leakage flow. The experiment was carried out in the Axial Flow Turbine Research Facility (AFTRF) at Penn State, with velocity measurements taken with a 3-D LDV System. Two radial traverses at 1% and 10% of chord downstream of the rotor have been performed to identify the three-dimensional flow features at the exit of the rotor blade row. Sufficient spatial resolution was maintained to resolve blade wake, secondary flow, and tip leakage flow. The wake deficit is found to be substantial, especially at 1% of chord downstream of the rotor. At this location, negative axial velocity occurs near the tip, suggesting flow separation in the tip clearance region. Turbulence intensities peak in the wake region, and cross- correlations are mainly associated with the velocity gradient of the wake deficit. The radial velocities, both in the wake and in the endwall region, are found to be substantial. Two counter-rotating secondary flows are identified in the blade passage, with one occupying the half span close to the casino and the other occupying the half span close to the hub. The tip leakage flow is well restricted to 10% immersion from the blade tip. There are strong vorticity distributions associated with these secondary flows and tip leakage flow. The passage averaged data are in good agreement with design values. Lakshminarayana, B. and Ristic, D. and Chu, S. Glenn Research Center AXIAL FLOW TURBINES; BLADE TIPS; BOUNDARY LAYER SEPARATION; FLUID DYNAMICS; SPATIAL RESOLUTION; THREE DIMENSIONAL FLOW; VISCOUS FLOW; VORTICITY; WAKES; COUNTER ROTATION; FLOW DISTRIBUTION; RADIAL VELOCITY; SECONDARY FLOW; SEPARATED FLOW; TURBINES; VELOCITY DISTRIBUTION; VELOCITY MEASUREMENT...
Book Synopsis Three-dimensional Flow Field in a Turbine Nozzle Passage by : M. Zaccaria
Download or read book Three-dimensional Flow Field in a Turbine Nozzle Passage written by M. Zaccaria and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Three Dimensional Flow Field at the Exit of an Axial-Flow Turbine Rotor by : B. Lakshminarayana
Download or read book The Three Dimensional Flow Field at the Exit of an Axial-Flow Turbine Rotor written by B. Lakshminarayana and published by . This book was released on 1998 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three-Dimensional Flow Field Measurements in a Transonic Turbine Cascade by : P. W. Geil
Download or read book Three-Dimensional Flow Field Measurements in a Transonic Turbine Cascade written by P. W. Geil and published by . This book was released on 1996 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine and Aeroengine Congress & Exhibition Birmingham, UK - June 10-13, 1996.
Book Synopsis A Time Accurate Prediction of the Viscous Flow in a Turbine Stage Including a Rotor in Motion by : Akamol Shavalikul
Download or read book A Time Accurate Prediction of the Viscous Flow in a Turbine Stage Including a Rotor in Motion written by Akamol Shavalikul and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract A time accurate prediction of the viscous flow in a turbine stage including a rotor in motion By Akamol Shavalikul The actual flow field in a turbine stage is extremely complex, three-dimensional, and unsteady, mainly due to interactions between the nozzle guide vanes (NGV) and the rotor vanes. A detailed understanding of turbine flow field characteristics, which is crucial for improving turbine performance, can be obtained using a computational fluid dynamics approach. In this current study, the flow field in the Pennsylvania State University Axial Flow Turbine Research Facility (AFTRF) was simulated using a three-dimensional Reynolds Averaged Navier-Stokes finite volume solver (RANS). This study examined four sets of simulations. The first set of flow simulations is an individual NGV passage flow field without the influence of a rotor blade row. The simulation results were used to produce the flow visualization in an NGV passage, which provide more detailed NGV flow characteristics. Secondly, a set of a rotor flow simulations was carried out to examine the flow fields associated with different pressure side tip extension configurations, which are designed to reduce the tip leakage flow. RANS based viscous flow simulations were used to compare a number of potential aerodynamic de-sensitization designs for blade tips. The last two sets use a multiple reference frames approach for a complete turbine stage with two different interface models. The first interface model is the circumferentially averaged mixing plane model. The quasi-steady state flow characteristics of the AFTRF can be obtained from this interface model. This model was not only used to investigate the flow characteristics in the turbine stage but also the effects of using pressure side rotor tip extensions. The tip leakage flow fields simulated from this model and from the linear cascade model show similar trends. More detailed understanding of unsteady characteristics of a turbine flow field can be obtained using the second type of interface model, the time accurate sliding-mesh model. The potential flow interactions, wake characteristics, their effects on secondary flow formation, and the wake mixing process in a rotor passage were examined using this model. A comparison between the results from the circumferential average model and the time accurate flow model results is presented. It was found that the circumferential average model cannot accurately simulate flow interaction characteristics on the interface plane between the NGV trailing edge and the rotor leading edge. However, the circumferential average model does give accurate flow characteristics in the NGV domain and the rotor domain with less computational time and computer memory requirements. In contrast, the time accurate flow simulation can predict all unsteady flow characteristics occurring in the turbine stage, but with high computational resource requirements.
Book Synopsis Calculation of the 3-D Viscous Flow at the Endwall Leading Edge Region of an Axial Annular Turbine Cascade by : L. Walitt
Download or read book Calculation of the 3-D Viscous Flow at the Endwall Leading Edge Region of an Axial Annular Turbine Cascade written by L. Walitt and published by . This book was released on 1984 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Three-dimensional Flow Field Downstream of an Axial-flow Turbine Rotor by : D. Ristic
Download or read book Three-dimensional Flow Field Downstream of an Axial-flow Turbine Rotor written by D. Ristic and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Turbomachinery by : Earl Logan, Jr.
Download or read book Handbook of Turbomachinery written by Earl Logan, Jr. and published by CRC Press. This book was released on 2003-05-01 with total page 927 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis An Experimental Investigation of Steady and Unsteady Flow Field in an Axial Flow Turbine by : M. Zaccaria
Download or read book An Experimental Investigation of Steady and Unsteady Flow Field in an Axial Flow Turbine written by M. Zaccaria and published by . This book was released on 1997 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Three Dimensional Viscous Flow Including Tip Clearance Phenomena in Axial Turbines by : G. Billonet
Download or read book Analysis of Three Dimensional Viscous Flow Including Tip Clearance Phenomena in Axial Turbines written by G. Billonet and published by . This book was released on 1992 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Fluids Engineering written by and published by . This book was released on 1998 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unsteady Flow Field Due to Nozzle Wake Interaction with the Rotor in an Axial Flow Turbine: Part I - Rotor Passage Flow Field by : Michael A. Zaccaria
Download or read book Unsteady Flow Field Due to Nozzle Wake Interaction with the Rotor in an Axial Flow Turbine: Part I - Rotor Passage Flow Field written by Michael A. Zaccaria and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine and Aeroengine Congress & Exposition, Houston, Texas - June 5-8, 1995.
Book Synopsis Validation of Viscous, Three-dimensional Flow Calculations in an Axial Turbine Cascade by : James Gilbert Edwin Cleak
Download or read book Validation of Viscous, Three-dimensional Flow Calculations in an Axial Turbine Cascade written by James Gilbert Edwin Cleak and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: