Effect Of Dimple Pattern On The Supression Of Boundary Layer Separation On A Low Pressure Turbine Blade

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Effect of Dimple Pattern on the Suppression of Boundary Layer Separation on a Low Pressure Turbine Blade

Author : John P. Casey
Publisher :
ISBN 13 : 9781423517092
Total Pages : 201 pages
Book Rating : 4.5/5 (17 download)

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Book Synopsis Effect of Dimple Pattern on the Suppression of Boundary Layer Separation on a Low Pressure Turbine Blade by : John P. Casey

Download or read book Effect of Dimple Pattern on the Suppression of Boundary Layer Separation on a Low Pressure Turbine Blade written by John P. Casey and published by . This book was released on 2004-03-01 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three dimple patterns were investigated to ascertain their relative effectiveness on controlling boundary layer separation from a low-pressure turbine blade. The three cases included a single row of dimples at 65% of the axial chord with 2.22 cm spacing, a single row of dimples at 65% of the axial chord with 4.44 cm spacing, and a two-row staggered pattern with rows at 65% and 76% of the axial chord with 4.44 cm spacing. The multiple row case was such that the center of the upstream dimple set at the midpoint between two downstream dimples. The dimple spacing was measured center-on-center. Each of the dimple patterns was studied and compared to an unmodified blade at axial chord Reynolds numbers based on inlet velocity of 25k, 45k, and 100k. Experimental data was collected in a low-speed, draw down wind tunnel containing a linear turbine cascade of 8 Pak-B blades. Measurements of surface pressure, boundary layer parameters, wake velocity, and total pressure losses were made to examine the flow. No dimple pattern dramatically outperformed the others. Each of the dimple patterns studied improved the average total pressure loss coefficient by 34% for Re 25k and 1% Tu. Complementing the experimental effort was a three-dimensional computational fluid dynamics study. Four models were built and analyzed. The models included an unmodified blade, blades with dimples at 65% of the axial chord with 2 cm or 4 cm spacing, respectively, and a multiple row case consisting of dimples at 65% and 76% of the axial chord with 2 cm spacing. Again the upstream dimple set at the midpoint between two downstream dimples. The computational fluid dynamics study provided detailed flow visualization in and around the dimples as well as a comparison to experimental data for solver verification. It was shown that the computational and experimental results showed similar trends in wake loss and boundary layer traverses.

40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit July 11-14, 2004, Fort Lauderdale, FL.: 04-3550 - 04-3599

Author :
Publisher :
ISBN 13 :
Total Pages : 398 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit July 11-14, 2004, Fort Lauderdale, FL.: 04-3550 - 04-3599 by :

Download or read book 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit July 11-14, 2004, Fort Lauderdale, FL.: 04-3550 - 04-3599 written by and published by . This book was released on 2004 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Use of Dimples to Suppress Boundary Layer Separation on a Low Pressure Turbine Blade

Author : Kurt P. Rouser
Publisher :
ISBN 13 : 9781423506430
Total Pages : 202 pages
Book Rating : 4.5/5 (64 download)

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Book Synopsis Use of Dimples to Suppress Boundary Layer Separation on a Low Pressure Turbine Blade by : Kurt P. Rouser

Download or read book Use of Dimples to Suppress Boundary Layer Separation on a Low Pressure Turbine Blade written by Kurt P. Rouser and published by . This book was released on 2002-12-01 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow separation on a low pressure turbine blade is explored at Reynolds numbers of 25k, 45k and 100k, Experimental data is collected in a low- speed, draw-down wind tunnel using a cascade of eight Pak-B blades, Flow is examined from measurements of blade surface pressures, boundary layer parameters, exit velocities, and total pressure losses across the blade, Two recessed dimple shapes are assessed for suppressing flow separation and associated losses, One dimple is spherical, and the second is asymmetric, formed from a full dimple spanwise half-filled, A single row of each dimple shape is tested at 50%, 55% and 65% axial chord, Symmetric dimples reduce separation losses by as much as 28%, while asymmetric dimples reduce losses by as much as 23%, A complementary three-dimensional computational study is conducted to visualize local flow structure, Computational analysis uses Gridgen v13,3 as a mesh generator, Fluent v6,O as a flow solver and FIELDVIEW - v8,0 for graphic display and analysis, Computational results for Pak-B blades at a Reynolds number of 25k indicate that both dimple shapes cause a span-wise vortex to rollup within the dimple and provide a localized pressure drop,

Heat Transfer in Gas Turbines

Author : Bengt Sundén
Publisher : Witpress
ISBN 13 :
Total Pages : 544 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Heat Transfer in Gas Turbines by : Bengt Sundén

Download or read book Heat Transfer in Gas Turbines written by Bengt Sundén and published by Witpress. This book was released on 2001 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title presents and reflects current active research on various heat transfer topics and related phenomena in gas turbine systems. It begins with a general introduction to gas turbine heat transfer, before moving on to specific areas.

Gas Turbine Blade Cooling

Author : Chaitanya D Ghodke
Publisher : SAE International
ISBN 13 : 0768095026
Total Pages : 238 pages
Book Rating : 4.7/5 (68 download)

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Book Synopsis Gas Turbine Blade Cooling by : Chaitanya D Ghodke

Download or read book Gas Turbine Blade Cooling written by Chaitanya D Ghodke and published by SAE International. This book was released on 2018-12-10 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas turbines play an extremely important role in fulfilling a variety of power needs and are mainly used for power generation and propulsion applications. The performance and efficiency of gas turbine engines are to a large extent dependent on turbine rotor inlet temperatures: typically, the hotter the better. In gas turbines, the combustion temperature and the fuel efficiency are limited by the heat transfer properties of the turbine blades. However, in pushing the limits of hot gas temperatures while preventing the melting of blade components in high-pressure turbines, the use of effective cooling technologies is critical. Increasing the turbine inlet temperature also increases heat transferred to the turbine blade, and it is possible that the operating temperature could reach far above permissible metal temperature. In such cases, insufficient cooling of turbine blades results in excessive thermal stress on the blades causing premature blade failure. This may bring hazards to the engine's safe operation. Gas Turbine Blade Cooling, edited by Dr. Chaitanya D. Ghodke, offers 10 handpicked SAE International's technical papers, which identify key aspects of turbine blade cooling and help readers understand how this process can improve the performance of turbine hardware.

Gas Turbine Heat Transfer and Cooling Technology, Second Edition

Author : Je-Chin Han
Publisher : CRC Press
ISBN 13 : 1439855684
Total Pages : 892 pages
Book Rating : 4.4/5 (398 download)

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Book Synopsis Gas Turbine Heat Transfer and Cooling Technology, Second Edition by : Je-Chin Han

Download or read book Gas Turbine Heat Transfer and Cooling Technology, Second Edition written by Je-Chin Han and published by CRC Press. This book was released on 2012-11-27 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive reference for engineers and researchers, Gas Turbine Heat Transfer and Cooling Technology, Second Edition has been completely revised and updated to reflect advances in the field made during the past ten years. The second edition retains the format that made the first edition so popular and adds new information mainly based on selected published papers in the open literature. See What’s New in the Second Edition: State-of-the-art cooling technologies such as advanced turbine blade film cooling and internal cooling Modern experimental methods for gas turbine heat transfer and cooling research Advanced computational models for gas turbine heat transfer and cooling performance predictions Suggestions for future research in this critical technology The book discusses the need for turbine cooling, gas turbine heat-transfer problems, and cooling methodology and covers turbine rotor and stator heat-transfer issues, including endwall and blade tip regions under engine conditions, as well as under simulated engine conditions. It then examines turbine rotor and stator blade film cooling and discusses the unsteady high free-stream turbulence effect on simulated cascade airfoils. From here, the book explores impingement cooling, rib-turbulent cooling, pin-fin cooling, and compound and new cooling techniques. It also highlights the effect of rotation on rotor coolant passage heat transfer. Coverage of experimental methods includes heat-transfer and mass-transfer techniques, liquid crystal thermography, optical techniques, as well as flow and thermal measurement techniques. The book concludes with discussions of governing equations and turbulence models and their applications for predicting turbine blade heat transfer and film cooling, and turbine blade internal cooling.

Detached Eddy Simulation Analysis of Pak-B Low Pressure Turbine Blade

Author : Kyle P. Malone
Publisher :
ISBN 13 : 9781423586470
Total Pages : 71 pages
Book Rating : 4.5/5 (864 download)

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Book Synopsis Detached Eddy Simulation Analysis of Pak-B Low Pressure Turbine Blade by : Kyle P. Malone

Download or read book Detached Eddy Simulation Analysis of Pak-B Low Pressure Turbine Blade written by Kyle P. Malone and published by . This book was released on 2004-06-01 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two cases were computationally investigated using the detached eddy simulation (DES) turbulence model: an unmodified Pak-B blade and a Pak-B blade with a dimple located at 65% of axial chord. Both cases were created so that they simulated an infinite span with an infinite number of dimples. The cases were run for an inlet Reynolds number of 25,000. The computed results were used to resolve the location of separation and reattachment, visualize the streamlines for the dimpled case, build velocity magnitude contour and vector plots, and map the thickness of the boundary layer. The results were then compared to previous computational and experimental studies in order to validate the detached eddy simulation model for future research into the effect of dimples on low pressure turbine flow fields. For the unmodified blade, the performance of the DES model compared favorably to other available viscous and turbulence models. For the dimpled blade, preliminary results also compare favorably to other models although further development of the flow field is needed to verify this. Based on these results, future researchers studying dimples on turbine blades should strongly consider using the DES turbulence model.

Selected Problems in Fluid Flow and Heat Transfer

Author : Artur J. Jaworski
Publisher : MDPI
ISBN 13 : 3039214276
Total Pages : 460 pages
Book Rating : 4.0/5 (392 download)

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Book Synopsis Selected Problems in Fluid Flow and Heat Transfer by : Artur J. Jaworski

Download or read book Selected Problems in Fluid Flow and Heat Transfer written by Artur J. Jaworski and published by MDPI. This book was released on 2019-09-20 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid flow and heat transfer processes play an important role in many areas of science and engineering, from the planetary scale (e.g., influencing weather and climate) to the microscopic scales of enhancing heat transfer by the use of nanofluids; understood in the broadest possible sense, they also underpin the performance of many energy systems. This topical Special Issue of Energies is dedicated to the recent advances in this very broad field. This book will be of interest to readers not only in the fields of mechanical, aerospace, chemical, process and petroleum, energy, earth, civil ,and flow instrumentation engineering but, equally, biological and medical sciences, as well as physics and mathematics; that is, anywhere that “fluid flow and heat transfer” phenomena may play an important role or be a subject of worthy research pursuits.

Fluid Mechanics and Fluid Power

Author : T. Prabu
Publisher : Springer Nature
ISBN 13 : 9811606986
Total Pages : 901 pages
Book Rating : 4.8/5 (116 download)

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Book Synopsis Fluid Mechanics and Fluid Power by : T. Prabu

Download or read book Fluid Mechanics and Fluid Power written by T. Prabu and published by Springer Nature. This book was released on 2021-08-03 with total page 901 pages. Available in PDF, EPUB and Kindle. Book excerpt: div="" style="" This book comprises select proceedings of the 46th National Conference on Fluid Mechanics and Fluid Power (FMFP 2019). The contents of this book focus on aerodynamics and flow control, computational fluid dynamics, fluid structure interaction, noise and aero-acoustics, unsteady and pulsating flows, vortex dynamics, nuclear thermal hydraulics, heat transfer in nanofluids, etc. This book serves as a useful reference beneficial to researchers, academicians and students interested in the broad field of mechanics. ^

Advances in Wind Turbine Blade Design and Materials

Author : Povl Brondsted
Publisher : Elsevier
ISBN 13 : 0857097288
Total Pages : 485 pages
Book Rating : 4.8/5 (57 download)

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Book Synopsis Advances in Wind Turbine Blade Design and Materials by : Povl Brondsted

Download or read book Advances in Wind Turbine Blade Design and Materials written by Povl Brondsted and published by Elsevier. This book was released on 2013-10-31 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wind energy is gaining critical ground in the area of renewable energy, with wind energy being predicted to provide up to 8% of the world's consumption of electricity by 2021. Advances in wind turbine blade design and materials reviews the design and functionality of wind turbine rotor blades as well as the requirements and challenges for composite materials used in both current and future designs of wind turbine blades.Part one outlines the challenges and developments in wind turbine blade design, including aerodynamic and aeroelastic design features, fatigue loads on wind turbine blades, and characteristics of wind turbine blade airfoils. Part two discusses the fatigue behavior of composite wind turbine blades, including the micromechanical modelling and fatigue life prediction of wind turbine blade composite materials, and the effects of resin and reinforcement variations on the fatigue resistance of wind turbine blades. The final part of the book describes advances in wind turbine blade materials, development and testing, including biobased composites, surface protection and coatings, structural performance testing and the design, manufacture and testing of small wind turbine blades.Advances in wind turbine blade design and materials offers a comprehensive review of the recent advances and challenges encountered in wind turbine blade materials and design, and will provide an invaluable reference for researchers and innovators in the field of wind energy production, including materials scientists and engineers, wind turbine blade manufacturers and maintenance technicians, scientists, researchers and academics. - Reviews the design and functionality of wind turbine rotor blades - Examines the requirements and challenges for composite materials used in both current and future designs of wind turbine blades - Provides an invaluable reference for researchers and innovators in the field of wind energy production

Aerodynamics of Low Reynolds Number Flyers

Author : Wei Shyy
Publisher : Cambridge University Press
ISBN 13 : 9780521204019
Total Pages : 0 pages
Book Rating : 4.2/5 (4 download)

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Book Synopsis Aerodynamics of Low Reynolds Number Flyers by : Wei Shyy

Download or read book Aerodynamics of Low Reynolds Number Flyers written by Wei Shyy and published by Cambridge University Press. This book was released on 2011-04-28 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low Reynolds number aerodynamics is important to a number of natural and man-made flyers. Birds, bats, and insects have been of interest to biologists for years, and active study in the aerospace engineering community, motivated by interest in micro air vehicles (MAVs), has been increasing rapidly. The primary focus of this book is the aerodynamics associated with fixed and flapping wings. The book consider both biological flyers and MAVs, including a summary of the scaling laws-which relate the aerodynamics and flight characteristics to a flyer's sizing on the basis of simple geometric and dynamics analyses, structural flexibility, laminar-turbulent transition, airfoil shapes, and unsteady flapping wing aerodynamics. The interplay between flapping kinematics and key dimensionless parameters such as the Reynolds number, Strouhal number, and reduced frequency is highlighted. The various unsteady lift enhancement mechanisms are also addressed, including leading-edge vortex, rapid pitch-up and rotational circulation, wake capture, and clap-and-fling.

Failure Analysis of Heat Treated Steel Components

Author : Lauralice de Campos Franceschini Canale
Publisher : ASM International
ISBN 13 : 1615030980
Total Pages : 651 pages
Book Rating : 4.6/5 (15 download)

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Book Synopsis Failure Analysis of Heat Treated Steel Components by : Lauralice de Campos Franceschini Canale

Download or read book Failure Analysis of Heat Treated Steel Components written by Lauralice de Campos Franceschini Canale and published by ASM International. This book was released on 2008 with total page 651 pages. Available in PDF, EPUB and Kindle. Book excerpt:

CO2 Laser Cutting

Author : John Powell
Publisher : Springer Science & Business Media
ISBN 13 : 1447133846
Total Pages : 256 pages
Book Rating : 4.4/5 (471 download)

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Book Synopsis CO2 Laser Cutting by : John Powell

Download or read book CO2 Laser Cutting written by John Powell and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: CO2 Laser Cutting explains and describes how engineering materials are cut using a CO2 laser. Information is given on the cutting of metals and non metals on a wide range of levels from practical advice and processing parameters to explanations of the physical and chemical reactions which take place in the cut zone. In an effort to make the book as readable and informative as possible the subject is treated in a descriptive rather than a mathematical way. The benefit of CO2 Laser Cutting is twofold as it gives practical advice to the operator and technical advice to the researchers or scientist.

Fixed and Flapping Wing Aerodynamics for Micro Air Vehicle Applications

Author : Thomas J. Mueller
Publisher : AIAA
ISBN 13 : 9781600864469
Total Pages : 614 pages
Book Rating : 4.8/5 (644 download)

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Book Synopsis Fixed and Flapping Wing Aerodynamics for Micro Air Vehicle Applications by : Thomas J. Mueller

Download or read book Fixed and Flapping Wing Aerodynamics for Micro Air Vehicle Applications written by Thomas J. Mueller and published by AIAA. This book was released on 2001 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt: This title reports on the latest research in the area of aerodynamic efficency of various fixed-wing, flapping wing, and rotary wing concepts. It presents the progress made by over fifty active researchers in the field.

Advances in Micro and Nano Manufacturing and Surface Engineering

Author : M. S. Shunmugam
Publisher : Springer Nature
ISBN 13 : 9813294256
Total Pages : 720 pages
Book Rating : 4.8/5 (132 download)

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Book Synopsis Advances in Micro and Nano Manufacturing and Surface Engineering by : M. S. Shunmugam

Download or read book Advances in Micro and Nano Manufacturing and Surface Engineering written by M. S. Shunmugam and published by Springer Nature. This book was released on 2019-11-30 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents research papers on micro and nano manufacturing and surface engineering which were presented during the 7th International and 28th All India Manufacturing Technology, Design and Research conference 2018 (AIMTDR 2018). The papers discuss the latest advances in miniature manufacturing, the machining of miniature components and features as well as improvement of surface properties. This volume will be of interest to academicians, researchers, and practicing engineers alike.

Lecture Series "Boundary Layer Theory.": Laminar flows

Author : Hermann Schlichting
Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.3/5 (121 download)

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Book Synopsis Lecture Series "Boundary Layer Theory.": Laminar flows by : Hermann Schlichting

Download or read book Lecture Series "Boundary Layer Theory.": Laminar flows written by Hermann Schlichting and published by . This book was released on 1949 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Rules of Thumb for Chemical Engineers

Author : Carl Branan
Publisher : Gulf Professional Publishing
ISBN 13 : 9780750675673
Total Pages : 438 pages
Book Rating : 4.6/5 (756 download)

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Book Synopsis Rules of Thumb for Chemical Engineers by : Carl Branan

Download or read book Rules of Thumb for Chemical Engineers written by Carl Branan and published by Gulf Professional Publishing. This book was released on 2002 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fractionators, separators and accumulators, cooling towers, gas treating, blending, troubleshooting field cases, gas solubility, and density of irregular solids * Hundreds of common sense techniques, shortcuts, and calculations.