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A Numerical And Experimental Study Of Windback Seals
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Book Synopsis A Numerical and Experimental Study of Windback Seals by : Chae H. Lim
Download or read book A Numerical and Experimental Study of Windback Seals written by Chae H. Lim and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Windback seals work similarly to labyrinth seals except for the effect of helical groove. These seals are essentially a tooth on stator or tooth on rotor labyrinth seal where the grooves are a continuous helical cut like a thread. Windback seals are used in centrifugal gas compressor to keep oil out of the gas face seal area. These face seals cannot be contaminated by oil. A purge gas is applied to the seal to help force the oil back into the bearing area. The windback seal should be designed to prevent any oil contamination into the supply plenum and to reduce purge gas leakage. The CFD simulations have been performed with the effect of clearance, tooth width, cavity shape, shaft rotation, eccentricity, and tooth location on the seal leakage performance and the flow field inside the seal. The leakage flow rate increases with increasing the pressure differential, rotor speed, radial clearance, cavity size, and shaft diameter and with decreasing the tooth width. The eccentricity has a minimal effect for the windback seal. From oil simulations, the windback seal with 25% rotor eccentricity has some of the journal bearing action and drives back flow into the gas plenum. However the windback seal can be used to force the oil back into the bearing side before starting the compressor by applying a purge gas flow since the positive axial velocity inside the cavity is larger than the negative axial velocity. m A Rw cav & /? is constant for varying shaft rotation since the leakage flow rate for the windback seal increases linearly as the the rotor speed increases. The leakage flow rate for the windback seal increases as the groove size increases due to the pumping action of the windback seal. A windback seal design based upon the numerical simulations that minimize gas leakage and help prevent gas face seal oil contamination was optimized. The windback seal has two leakage flow paths. Since the leakage flow rate under teeth of windback seals is the same as for a similar geometry labyrinth seal, the flow under the teeth can be predicted by two-dimensional labyrinth seal analysis. An empirical model for the leakage rate through the cavity has been developed which fits the data with a standard deviation of 0.12.
Book Synopsis Windback Seal Design for Gas Compressors by : Adnan Mahmoud Al-Ghasem
Download or read book Windback Seal Design for Gas Compressors written by Adnan Mahmoud Al-Ghasem and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Seals are considered one of the important flow elements of a turbomachinery device. Traditional labyrinth seals have proven their performance functionality by reducing leakage rates. Significant improvements on labyrinth seal functionality were obtained through altering the design geometry of labyrinth seals to prevent contamination across a seal and maintaining small leakage flowrates. This results in a windback seal that has only one tooth which continuously winds around the shaft like a screw thread. These seals are used in gas compressors to isolate the gas face seal from bearing oil. A purge gas is passed through the seal into the bearing housing. The helical design allows the seal to clear itself of any oil contamination. Windback seal performance is controlled through changing the seal geometry. A 2D graphical design tool for calculating the total and cavity leakage flowrates for windback seals is introduced. The effectiveness of the Fluent CFD (Computational Fluid Dynamics) commercial code to accurately predict the leakage rate for windback seals was evaluated. The objective is to determine if CFD simulations can be used along with a few experimental tests to study windback seals of this design with air as the working fluid. Comparison of measurement and predictions for a windback seal using the [kappa-epsilon]turbulence model with enhanced wall treatment functions show predictions and measurements comparing very well with a maximum difference of 5% for leakage rate. Similarly, the leakage rate of the tested smooth seal compares favorably with two dimensional CFD predictions, with a difference of 2%-11% and 8%-15% using laminar and [kappa-epsilon] turbulent flow models, respectively. The variation of leakage with shaft speed and pressure ratio across the seals is accurately predicted by the CFD simulations. Increasing the rotor speed to15000 rpm increases the measured leakage flowrate for the windback seal by 2% at high differential pressure and 4.5% at low differential pressure, and decreases it by 10 % for the smooth seal. The effects of seal clearance, tooth pitch, cavity depth and the tooth number of starts on leakage flowrate, velocity and pressure distributions were studied numerically for three differential pressures and four rotor speeds.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721152339 Total Pages :128 pages Book Rating :4.1/5 (523 download)
Book Synopsis Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals. Volume 5; Description of Seal Dynamics Code Dyseal and Labyrinth Seals Code Ktk by : National Aeronautics and Space Administration (NASA)
Download or read book Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals. Volume 5; Description of Seal Dynamics Code Dyseal and Labyrinth Seals Code Ktk written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the program were to develop computational fluid dynamics (CFD) codes and simpler industrial codes for analyzing and designing advanced seals for air-breathing and space propulsion engines. The CFD code SCISEAL is capable of producing full three-dimensional flow field information for a variety of cylindrical configurations. An implicit multidomain capability allow the division of complex flow domains to allow optimum use of computational cells. SCISEAL also has the unique capability to produce cross-coupled stiffness and damping coefficients for rotordynamic computations. The industrial codes consist of a series of separate stand-alone modules designed for expeditious parametric analyses and optimization of a wide variety of cylindrical and face seals. Coupled through a Knowledge-Based System (KBS) that provides a user-friendly Graphical User Interface (GUI), the industrial codes are PC based using an OS/2 operating system. These codes were designed to treat film seals where a clearance exists between the rotating and stationary components. Leakage is inhibited by surface roughness, small but stiff clearance films, and viscous pumping devices. The codes have demonstrated to be a valuable resource for seal development of future air-breathing and space propulsion engines Shapiro, Wilbur and Chupp, Raymond and Holle, Glenn and Scott, Thomas Glenn Research Center NAS3-25644; WBS 22-00-00
Book Synopsis Numerical and Experimental Evaluation of a New Low-leakage Labyrinth Seal by : D.L. Rhode
Download or read book Numerical and Experimental Evaluation of a New Low-leakage Labyrinth Seal written by D.L. Rhode and published by . This book was released on 1988 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical and Experimental Investigations on Non-contacting Seals for Small-scale Applications by : Suresh Katuwal Chhetri
Download or read book Numerical and Experimental Investigations on Non-contacting Seals for Small-scale Applications written by Suresh Katuwal Chhetri and published by . This book was released on 2020 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mots-clés de l'auteur: Reduced-scale seal ; Real gas effect ; Seal model ; Leakage ; Cavity Pressure ; Cavity temperature ; Experimental investigation ; Model validation ; Superheat ; R134a.
Book Synopsis Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals by : Anita D. Liang
Download or read book Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals written by Anita D. Liang and published by BiblioGov. This book was released on 2013-07 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the program were to develop computational fluid dynamics (CFD) codes and simpler industrial codes for analyzing and designing advanced seals for air-breathing and space propulsion engines. The CFD code SCISEAL is capable of producing full three-dimensional flow field information for a variety of cylindrical configurations. An implicit multidomain capability allow the division of complex flow domains to allow optimum use of computational cells. SCISEAL also has the unique capability to produce cross-coupled stiffness and damping coefficients for rotordynamic computations. The industrial codes consist of a series of separate stand-alone modules designed for expeditious parametric analyses and optimization of a wide variety of cylindrical and face seals. Coupled through a Knowledge-Based System (KBS) that provides a user-friendly Graphical User Interface (GUI), the industrial codes are PC based using an OS/2 operating system. These codes were designed to treat film seals where a clearance exists between the rotating and stationary components. Leakage is inhibited by surface roughness, small but stiff clearance films, and viscous pumping devices. The codes have demonstrated to be a valuable resource for seal development of future air-breathing and space propulsion engines.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721142620 Total Pages :140 pages Book Rating :4.1/5 (426 download)
Book Synopsis Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals. Volume 2; Description of Gas Seal Codes Gcylt and Gface by : National Aeronautics and Space Administration (NASA)
Download or read book Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals. Volume 2; Description of Gas Seal Codes Gcylt and Gface written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the program were to develop computational fluid dynamics (CFD) codes and simpler industrial codes for analyzing and designing advanced seals for air-breathing and space propulsion engines. The CFD code SCISEAL is capable of producing full three-dimensional flow field information for a variety of cylindrical configurations. An implicit multidomain capability allow the division of complex flow domains to allow optimum use of computational cells. SCISEAL also has the unique capability to produce cross-coupled stiffness and damping coefficients for rotordynamic computations. The industrial codes consist of a series of separate stand-alone modules designed for expeditious parametric analyses and optimization of a wide variety of cylindrical and face seals. Coupled through a Knowledge-Based System (KBS) that provides a user-friendly Graphical User Interface (GUI), the industrial codes are PC based using an OS/2 operating system. These codes were designed to treat film seals where a clearance exists between the rotating and stationary components. Leakage is inhibited by surface roughness, small but stiff clearance films, and viscous pumping devices. The codes have demonstrated to be a valuable resource for seal development of future air-breathing and space propulsion engines. Liang, Anita D. (Technical Monitor) and Shapiro, Wilbur Glenn Research Center NAS3-25644; WBS 22-5000-0013
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720649595 Total Pages :50 pages Book Rating :4.6/5 (495 download)
Book Synopsis Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals. Volume 1; Executive Summary and Description of Knowledge-Based System by : National Aeronautics and Space Administration (NASA)
Download or read book Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals. Volume 1; Executive Summary and Description of Knowledge-Based System written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the program were to develop computational fluid dynamics (CFD) codes and simpler industrial codes for analyzing and designing advanced seals for air-breathing and space propulsion engines. The CFD code SCISEAL is capable of producing full three-dimensional flow field information for a variety of cylindrical configurations. An implicit multidomain capability allows the division of complex flow domains to allow optimum use of computational cells. SCISEAL also has the unique capability to produce cross-coupled stiffness and damping coefficients for rotordynamic computations. The industrial codes consist of a series of separate stand-alone modules designed for expeditious parametric analyses and optimization of a wide variety of cylindrical and face seals. Coupled through a Knowledge-Based System (KBS) that provides a user-friendly Graphical User Interface (GUI), the industrial codes are PC based using an OS/2 operating system. These codes were designed to treat film seals where a clearance exists between the rotating and stationary components. Leakage is inhibited by surface roughness, small but stiff clearance films, and viscous pumping devices. The codes have demonstrated to be a valuable resource for seal development of future air-breathing and space propulsion engines.Liang, Anita D. (Technical Monitor) and Shapiro, Wilbur and Aggarwal, BharatGlenn Research CenterSEALS (STOPPERS); THREE DIMENSIONAL FLOW; COMPUTATIONAL FLUID DYNAMICS; FLOW DISTRIBUTION; AIR BREATHING ENGINES; CYLINDRICAL BODIES; GRAPHICAL USER INTERFACE; EXPERT SYSTEMS
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720649793 Total Pages :86 pages Book Rating :4.6/5 (497 download)
Book Synopsis Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals. Volume 4; Description of Incompressible Fluid Seal Codes Icyl and Iface by : National Aeronautics and Space Administration (NASA)
Download or read book Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals. Volume 4; Description of Incompressible Fluid Seal Codes Icyl and Iface written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the program were to develop computational fluid dynamics (CFD) codes and simpler industrial codes for analyzing and designing advanced seals for air-breathing and space propulsion engines. The CFD code SCISEAL is capable of producing full three-dimensional flow field information for a variety of cylindrical configurations. An implicit multidomain capability allow the division of complex flow domains to allow optimum use of computational cells. SCISEAL also has the unique capability to produce cross-coupled stiffness and damping coefficients for rotordynamic computations. The industrial codes consist of a series of separate stand-alone modules designed for expeditious parametric analyses and optimization of a wide variety of cylindrical and face seals. Coupled through a Knowledge-Based System (KBS) that provides a user-friendly Graphical User Interface (GUI), the industrial codes are PC based using an OS/2 operating system. These codes were designed to treat film seals where a clearance exists between the rotating and stationary components. Leakage is inhibited by surface roughness, small but stiff clearance films, and viscous pumping devices. The codes have demonstrated to be a valuable resource for seal development of future air-breathing and space propulsion engines.Liang, Anita D. (Technical Monitor) and Artiles, AntonioGlenn Research CenterSEALS (STOPPERS); COMPUTATIONAL FLUID DYNAMICS; AIR BREATHING ENGINES; FLOW DISTRIBUTION; ROTOR DYNAMICS; THREE DIMENSIONAL FLOW; CYLINDRICAL BODIES; GRAPHICAL USER INTERFACE; EXPERT SYSTEMS
Book Synopsis Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals Volume 6 by : Mahesh Athavale
Download or read book Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals Volume 6 written by Mahesh Athavale and published by BiblioGov. This book was released on 2013-07 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the program were to develop computational fluid dynamics (CFD) codes and simpler industrial codes for analyzing and designing advanced seals for air-breathing and space propulsion engines. The CFD code SCISEAL is capable of producing full three-dimensional flow field information for a variety of cylindrical configurations. An implicit multidomain capability allow the division of complex flow domains to allow optimum use of computational cells. SCISEAL also has the unique capability to produce cross-coupled stiffness and damping coefficients for rotordynamic computations. The industrial codes consist of a series of separate stand-alone modules designed for expeditious parametric analyses and optimization of a wide variety of cylindrical and face seals. Coupled through a Knowledge-Based System (KBS) that provides a user-friendly Graphical User Interface (GUI), the industrial codes are PC based using an OS/2 operating system. These codes were designed to treat film seals where a clearance exists between the rotating and stationary components. Leakage is inhibited by surface roughness, small but stiff clearance films, and viscous pumping devices. The codes have demonstrated to be a valuable resource for seal development of future air-breathing and space propulsion engines.
Book Synopsis Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals by : Anita D. Liang
Download or read book Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals written by Anita D. Liang and published by BiblioGov. This book was released on 2013-07 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the program were to develop computational fluid dynamics (CFD) codes and simpler industrial codes for analyzing and designing advanced seals for air-breathing and space propulsion engines. The CFD code SCISEAL is capable of producing full three-dimensional flow field information for a variety of cylindrical configurations. An implicit multidomain capability allow the division of complex flow domains to allow optimum use of computational cells. SCISEAL also has the unique capability to produce cross-coupled stiffness and damping coefficients for rotordynamic computations. The industrial codes consist of a series of separate stand-alone modules designed for expeditious parametric analyses and optimization of a wide variety of cylindrical and face seals. Coupled through a Knowledge-Based System (KBS) that provides a user-friendly Graphical User Interface (GUI), the industrial codes are PC based using an OS/2 operating system. These codes were designed to treat film seals where a clearance exists between the rotating and stationary components. Leakage is inhibited by surface roughness, small but stiff clearance films, and viscous pumping devices. The codes have demonstrated to be a valuable resource for seal development of future air-breathing and space propulsion engines.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721142774 Total Pages :116 pages Book Rating :4.1/5 (427 download)
Book Synopsis Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals. Volume 3; Description of Spiral-Groove Codes Spiralg and Spirali by : National Aeronautics and Space Administration (NASA)
Download or read book Numerical, Analytical, Experimental Study of Fluid Dynamic Forces in Seals. Volume 3; Description of Spiral-Groove Codes Spiralg and Spirali written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of the program were to develop computational fluid dynamics (CFD) codes and simpler industrial codes for analyzing and designing advanced seals for air-breathing and space propulsion engines. The CFD code SCISEAL is capable of producing full three-dimensional flow field information for a variety of cylindrical configurations. An implicit multidomain capability allow the division of complex flow domains to allow optimum use of computational cells. SCISEAL also has the unique capability to produce cross-coupled stiffness and damping coefficients for rotordynamic computations. The industrial codes consist of a series of separate stand-alone modules designed for expeditious parametric analyses and optimization of a wide variety of cylindrical and face seals. Coupled through a Knowledge-Based System (KBS) that provides a user-friendly Graphical User Interface (GUI), the industrial codes are PC based using an OS/2 operating system. These codes were designed to treat film seals where a clearance exists between the rotating and stationary components. Leakage is inhibited by surface roughness, small but stiff clearance films, and viscous pumping devices. The codes have demonstrated to be a valuable resource for seal development of future air-breathing and space propulsion engines. Liang, Anita D. (Technical Monitor) and Walowit, Jed and Shapiro, Wilbur Glenn Research Center NAS3-25644; WBS 22-5000-0013
Download or read book Journal of Tribology written by and published by . This book was released on 2007 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Labyrinth Seal Flow by : Mike Michaud
Download or read book An Experimental Study of Labyrinth Seal Flow written by Mike Michaud and published by . This book was released on 2003 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Seals and Sealing Handbook by : Robert K. Flitney
Download or read book Seals and Sealing Handbook written by Robert K. Flitney and published by Elsevier. This book was released on 2014-06-13 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Seals and Sealing Handbook, Sixth Edition provides comprehensive coverage of sealing technology, bringing together information on all aspects of this area to enable you to make the right sealing choice. This includes detailed coverage on the seals applicable to static, rotary and reciprocating applications, the best materials to use in your sealing systems, and the legislature and regulations that may impact your sealing choices.Updated in line with current trends this updated reference provides the theory necessary for you to select the most appropriate seals for the job and with its 'Failure Guide', the factors to consider should anything go wrong. Building on the practical, stepped approach of its predecessor, Seals and Sealing Handbook, 6th Edition remains an essential reference for any engineer or designer who uses seals in their work. - A comprehensive reference covering a broad range of seal types for all situations, to ensure that you are able to select the most appropriate seal for any given task - Includes supporting case studies and a unique 'Failure Guide' to help you troubleshoot if things go wrong - New edition includes the most up-to-date information on sealing technology, making it an essential reference for anyone who uses seals in their work
Book Synopsis Numerical and Experimental Modelling of Brush Seals by : Lihong Chen
Download or read book Numerical and Experimental Modelling of Brush Seals written by Lihong Chen and published by . This book was released on 1998 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical and Experimental Analysis of an Elastohydrodynamic Seal for Gases by : Mohammad Fuad Hassan
Download or read book Numerical and Experimental Analysis of an Elastohydrodynamic Seal for Gases written by Mohammad Fuad Hassan and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
